mirror of
https://github.com/pytorch/pytorch.git
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a911eb74ae
Fixes #120644 Pull Request resolved: https://github.com/pytorch/pytorch/pull/120779 Approved by: https://github.com/zou3519
1810 lines
68 KiB
Python
1810 lines
68 KiB
Python
# mypy: ignore-errors
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import contextlib
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import functools
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import logging
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import os
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import traceback
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import weakref
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from collections import defaultdict
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from dataclasses import dataclass
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from typing import Any, Dict, List, Optional, Tuple, Type, TYPE_CHECKING, TypeVar
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from weakref import ReferenceType
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import torch
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import torch._custom_op
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import torch._logging
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from torch._C._functorch import is_functorch_wrapped_tensor
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from torch._guards import Source
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from torch._ops import OpOverload
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from torch._prims_common import suggest_memory_format
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from torch._subclasses.meta_utils import assert_eq, assert_metadata_eq, MetaConverter
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from torch._utils import render_call
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from torch.fx.operator_schemas import normalize_function
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from torch.multiprocessing.reductions import StorageWeakRef
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from torch.overrides import TorchFunctionMode
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from torch.utils._mode_utils import no_dispatch
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from torch.utils._python_dispatch import (
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is_traceable_wrapper_subclass,
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TorchDispatchMode,
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)
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from torch.utils._pytree import PyTree, tree_map
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from torch.utils._stats import count
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from torch.utils.weak import WeakIdRef
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if TYPE_CHECKING:
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from torch.fx.experimental.symbolic_shapes import ShapeEnv
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DimList = List
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log = logging.getLogger(__name__)
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# TODO: Hack to unblock https://github.com/pytorch/pytorch/pull/108186
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# Proper fix tracked by https://github.com/pytorch/pytorch/issues/120105
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try:
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not_implemented_log = torch._logging.getArtifactLogger(__name__, "not_implemented")
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except ValueError as e:
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if "'not_implemented' not registered" in str(e):
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import logging as not_implemented_log
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else:
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raise e
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pytree = torch.utils._pytree
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T = TypeVar("T")
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TensorWeakRef = Any
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aten = torch._ops.ops.aten
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CONSTANT_NUMEL_LIMIT = 1
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RECURSION_COUNT = 0
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# Small helper that increments recursion count, and
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# resets it when the object goes out of scope. Useful
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# if you don't want to increase indentation which is
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# what a context manager would do.
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class IncrementRecursionCount:
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def __init__(self):
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global RECURSION_COUNT
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RECURSION_COUNT += 1
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def __del__(self):
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global RECURSION_COUNT
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RECURSION_COUNT -= 1
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@dataclass
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class UnsupportedFakeTensorException(RuntimeError):
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reason: str
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@dataclass
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class DynamicOutputShapeException(RuntimeError):
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func: OpOverload
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@dataclass
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class DataDependentOutputException(RuntimeError):
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func: OpOverload
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@dataclass
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class UnsupportedOperatorException(RuntimeError):
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func: OpOverload
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def ordered_set(*items):
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return dict.fromkeys(items, True)
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@contextlib.contextmanager
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def unset_fake_temporarily():
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old = torch._C._unset_dispatch_mode(torch._C._TorchDispatchModeKey.FAKE)
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try:
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yield old
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finally:
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if old is not None:
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torch._C._set_dispatch_mode(old)
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def is_fake(x):
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if isinstance(x, FakeTensor):
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return True
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if is_traceable_wrapper_subclass(x):
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attrs, _ = type(x).__tensor_flatten__(x)
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flattened_tensors = [getattr(x, attr) for attr in attrs]
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# need to recurse because we could have nested subclasses
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all_fake = all(is_fake(x) for x in flattened_tensors)
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any_fake = any(is_fake(x) for x in flattened_tensors)
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assert all_fake == any_fake, "got mixed fake and real tensors!"
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return all_fake
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elif isinstance(x, torch.Tensor) and torch._is_functional_tensor(x):
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reapply_views = torch._C._functionalization_reapply_views_tls()
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unwrapped = torch._C._functorch._unwrap_functional_tensor(x, reapply_views)
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return is_fake(unwrapped)
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elif isinstance(x, torch.Tensor) and is_functorch_wrapped_tensor(x):
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unwrapped = torch._C._functorch.get_unwrapped(x)
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return is_fake(unwrapped)
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return False
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def maybe_get_fake_mode(t):
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if isinstance(t, FakeTensor):
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return t.fake_mode
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if is_traceable_wrapper_subclass(t):
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inner_tensor_names, _ = t.__tensor_flatten__()
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modes = [
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maybe_get_fake_mode(getattr(t, t_name)) for t_name in inner_tensor_names
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]
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m = modes[0]
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assert all(m is x for x in modes)
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return m
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elif isinstance(t, torch.Tensor) and torch._is_functional_tensor(t):
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reapply_views = torch._C._functionalization_reapply_views_tls()
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unwrapped = torch._C._functorch._unwrap_functional_tensor(t, reapply_views)
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return maybe_get_fake_mode(unwrapped)
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elif isinstance(t, torch.Tensor) and is_functorch_wrapped_tensor(t):
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unwrapped = torch._C._functorch.get_unwrapped(t)
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return maybe_get_fake_mode(unwrapped)
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return None
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@functools.lru_cache(None)
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def get_schema_info(func):
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return torch._C._SchemaInfo(func._schema) # type: ignore[attr-defined]
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# many of the decompositions registered to torch/_prims do not at the moment model
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# aliasing or strides, so as an incremental step, just enable the decompositions in
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# torch/_decomp/decompositions.py.
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# decomps are used for aot autograd tracing so we would like to unify on their
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# implementation and add additional testing to them
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@functools.lru_cache(None)
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def torch_decomp_decompositions(func):
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from torch._decomp import decomposition_table
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decompositions = torch._decomp.decompositions
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# Note that the function in the decomposition table might be
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# different from the one in the module because of the difference
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# in out handling in aten API and torch public API
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return decomposition_table[func].__module__.startswith(
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"torch._decomp"
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) and decomposition_table[func].__name__ in dir(decompositions)
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def tree_flatten_only(ty: Type[T], tree: PyTree):
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flat_vals = pytree.tree_leaves(tree)
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return [elem for elem in flat_vals if isinstance(elem, ty)]
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# Similar to `MetaConverter`, this is a class for converting
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# multiple tensors into fake tensors which share the same view/storage
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# structure. Like `MetaConverter`, it uses `WeakIdRef` to
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# hold a weak reference for all memoized tensors.
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class FakeTensorConverter:
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@property
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def tensor_memo(self):
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return self.meta_converter.tensor_memo
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meta_converter: MetaConverter
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constant_storage_mapping: Dict[StorageWeakRef, List[ReferenceType]]
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def __init__(self):
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self.meta_converter = MetaConverter()
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# map from to storage to corresponding constant tensors
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self.constant_storage_mapping = {}
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def add_constant_storage_mapping(self, fake_tensor):
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# when you have a constant, aliased tensor:
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# const_tensor.add_(torch.rand([1]))
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# all aliases of it must become no longer const
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assert isinstance(fake_tensor, FakeTensor) and fake_tensor.constant is not None
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weak_st = StorageWeakRef(fake_tensor.constant._typed_storage())
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# we need a map from a weak storage to all of its corresponding
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# constant tensors. python doesn't have the weak value equivalent
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# of defaultdict(list), so we are using a WeakValueDictionary as one
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if weak_st not in self.constant_storage_mapping:
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self.constant_storage_mapping[weak_st] = []
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self.constant_storage_mapping[weak_st].append(weakref.ref(fake_tensor))
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def invalidate_constant_aliases(self, tensor):
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assert not isinstance(tensor, FakeTensor)
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weak_st = StorageWeakRef(tensor._typed_storage())
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if weak_st not in self.constant_storage_mapping:
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return
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for weak_tensor_ref in self.constant_storage_mapping[weak_st]:
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ten = weak_tensor_ref()
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if ten is not None:
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ten._fix_weakref()
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ten.constant = None
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del self.constant_storage_mapping[weak_st]
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def _get_memo(self, t):
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if WeakIdRef(t) in self.tensor_memo:
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out = self.tensor_memo[WeakIdRef(t)]
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out._fix_weakref()
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return out
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return None
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def set_tensor_memo(self, t, v):
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th = WeakIdRef(t)
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# hold a weak ref to self, otherwise it will be kept alive
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# by the del_ten closure
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self_weak_ref = weakref.ref(self)
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def del_ten():
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self_ref = self_weak_ref()
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if self_ref is None:
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return
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# on shutdown, th may not be in memo
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self_ref.tensor_memo.pop(th, None)
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weakref.finalize(t, del_ten)
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self.tensor_memo[th] = v
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def from_real_tensor(
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self,
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fake_mode,
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t,
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make_constant=False,
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shape_env=None,
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*,
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source=None,
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symbolic_context=None,
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memoized_only=False,
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):
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# see note [Tensor Fakification and Symbol Caching]
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if not symbolic_context and not source and shape_env:
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if tracing_context := torch._guards.TracingContext.try_get():
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if t in tracing_context.tensor_to_context:
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symbolic_context = tracing_context.tensor_to_context[t]
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source = symbolic_context.tensor_source
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maybe_memo = self._get_memo(t)
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if maybe_memo is not None:
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return maybe_memo
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if memoized_only:
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return None
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existing_device = t.device
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# not yet supported in metatensors
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if t.is_quantized:
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raise UnsupportedFakeTensorException("quantized nyi in meta tensors")
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if type(t) is torch.nn.Parameter:
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assert not make_constant
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def mk_fake_tensor(make_meta_t):
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# NB: don't use in_kernel_invocation_manager. to
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# ensure FakeTensor can internally do constant computation
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# as necessary. Invocation manager is "more correct" as
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# it works for more operators in make_meta_t, but
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# invariant is that make_meta_t only calls factories
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# for which it is not strictly necessary to use the
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# invocation manager (I think!)
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with no_dispatch():
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return FakeTensor(
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fake_mode,
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make_meta_t(),
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existing_device,
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constant=t if make_constant else None,
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)
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out = self.meta_converter(
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t,
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shape_env=shape_env,
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callback=mk_fake_tensor,
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source=source,
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symbolic_context=symbolic_context,
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)
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if out is NotImplemented:
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raise UnsupportedFakeTensorException("meta converter nyi")
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if make_constant:
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self.add_constant_storage_mapping(out)
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# NB: meta_converter set the memo
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return out
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# If you specify the device, it MUST be a meta tensor.
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def from_meta_and_device(self, fake_mode, t, device):
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assert (
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t.device.type == "meta"
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), f"tensor's device must be `meta`, got {t.device.type} instead"
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maybe_memo = self._get_memo(t)
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if maybe_memo is not None:
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return maybe_memo
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out = FakeTensor(fake_mode, t, device)
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self.set_tensor_memo(t, out)
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return out
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# You can have a real tensor that you need to convert into a fake tensor.
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# If you have a meta tensor already, call from_meta_and_device.
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#
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# You're allowed to pass a meta tensor to be turned into a fake
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# tensor; although an odd thing to do, this can occur if you're doing
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# cross ref testing and the inner test is already operating on meta tensors.
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def __call__(
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self,
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fake_mode,
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t,
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*,
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make_constant=False,
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shape_env=None,
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source=None,
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symbolic_context=None,
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memoized_only=False,
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):
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return self.from_real_tensor(
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fake_mode,
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t,
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make_constant,
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shape_env=shape_env,
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source=source,
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symbolic_context=symbolic_context,
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memoized_only=memoized_only,
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)
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@functools.lru_cache(None)
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def init_cuda_context():
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# Backward will error with cuda Fake Tensors if no cuda tensors have been initialized first
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if torch.cuda.is_available():
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torch.empty(1, device="cuda") if torch.version.hip is None else torch.zeros(
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1, device="cuda"
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)
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@contextlib.contextmanager
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def in_kernel_invocation_manager(fake_mode):
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# See: note [Fake Tensor Dispatch Keys]
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prev_in_kernel = fake_mode.in_kernel_invocation
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meta_in_tls = torch._C._meta_in_tls_dispatch_include()
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assert meta_in_tls == prev_in_kernel, f"{meta_in_tls}, {prev_in_kernel}"
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guard = torch._C._DisableTorchDispatch() # type: ignore[attr-defined]
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fake_mode.in_kernel_invocation = True
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torch._C._set_meta_in_tls_dispatch_include(True)
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try:
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yield
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finally:
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fake_mode.in_kernel_invocation = prev_in_kernel
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torch._C._set_meta_in_tls_dispatch_include(prev_in_kernel)
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del guard
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# Return if the function allows Python numbers to bind to Tensors
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def should_allow_numbers_as_tensors(func: OpOverload):
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return torch._C._should_allow_numbers_as_tensors(
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func.name().split("::")[-1].split(".")[0]
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)
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class FakeTensorConfig:
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debug = os.environ.get("TORCH_FAKE_TENSOR_DEBUG", "0") == "1"
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class FakeTensor(torch.Tensor):
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"""
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Meta tensors give you the ability to run PyTorch code without having to
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actually do computation through tensors allocated on a `meta` device.
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Because the device is `meta`, meta tensors do not model device propagation.
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FakeTensor extends MetaTensors to also carry an additional `fake_device`
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which tracks devices that would have been used.
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"""
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fake_device: torch.device
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fake_mode: "FakeTensorMode"
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constant: Optional[torch.Tensor]
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# This memorizes the unbacked SymInt representing the number of nonzero
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# elements in this tensor. This is helpful if you do something like
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# x[mask] and y[mask]; mask.nonzero() gets repeatedly called and should
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# give a consistent unbacked SymInt. It needs to be invalidated in the
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# same way constant is.
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# TODO: Generalize this as needed, e.g., into a trie of memos
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_nonzero_memo: Optional[torch.SymInt]
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_nonzero_memo_vc: Optional[int]
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# Indicates to our torch_dispatch dispatching infra that
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# this is an "infra" mode with lower dispatching precedence.
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_mode_key = torch._C._TorchDispatchModeKey.FAKE
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@property
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def nonzero_memo(self):
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if self._nonzero_memo is None:
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return None
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# Version counter based tracking isn't 100% sound but it's close
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# enough
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if self._nonzero_memo_vc != self._version:
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self._nonzero_memo = None
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return None
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return self._nonzero_memo
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@property
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def device(self):
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if self.fake_mode.in_kernel_invocation:
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return torch.device("meta")
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else:
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return self.fake_device
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# Note: [Fake Tensor Dispatch Keys]
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# In order to model the behavior of device-specific autocast
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# and autograd logic, we update the dispatch keys of FakeTensors
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# to reflect their fake device. This includes the BackendComponent
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# (DispatchKey::Meta -> DispatchKey::CUDA), and also the BackendComponent
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# related Autocast and Autograd keys. __torch__dispatch__ sits below
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# Autocast and Autograd, and is only invoked when we are at the
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# kernel for the BackendComponent. Then, we add Meta to the
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# thread-local dispatch include set to hit the meta kernel
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# instead of the kernel of the BackendComponent for the fake device.
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# The `device_for_backend_keys` does that below
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# NOTE: this probably will not do the right thing for backends
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# that have dispatch keys which are higher than the "meta" key:
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# https://github.com/pytorch/pytorch/blob/main/c10/core/DispatchKey.h#L189
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# We don't support named tensors; graph break
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@property
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def names(self):
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raise UnsupportedFakeTensorException(
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"torch.compile doesn't support named tensors"
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)
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|
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@staticmethod
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def __new__(cls, fake_mode, elem, device, constant=None):
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self = torch.Tensor._make_subclass(
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cls,
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elem,
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elem.requires_grad,
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dispatch_device=True,
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device_for_backend_keys=device,
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)
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assert elem.device.type == "meta", elem.device.type
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device = device if isinstance(device, torch.device) else torch.device(device)
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# NB: it is fine, if a little confusing, for device to be meta
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# (we are faking a meta tensor in that case). However, it often
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# indicates some sort of confusion (e.g., you accidentally passed
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# in a meta tensor when you should have passed in the real tensor).
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# So by default we disallow meta, and if you are working in a situation
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# where it is helpful (e.g., crossref testing) you can turn it back
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# on
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if not fake_mode.allow_meta:
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assert device.type != "meta"
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# normalize device.
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|
if device.type == "cuda":
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init_cuda_context()
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|
|
if (
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device.type
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in ["cuda", "hpu", "xpu", torch._C._get_privateuse1_backend_name()]
|
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and device.index is None
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):
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device = torch.device(
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f"{device.type}:{getattr(torch, device.type).current_device()}"
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)
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self.fake_device = device # type: ignore[attr-defined]
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self.fake_mode = fake_mode # type: ignore[attr-defined]
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self.constant = constant # type: ignore[attr-defined]
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self._nonzero_memo = None # type: ignore[attr-defined]
|
|
self._nonzero_memo_vc = None # type: ignore[attr-defined]
|
|
|
|
if FakeTensorConfig.debug:
|
|
import traceback
|
|
|
|
self._debug_trace = traceback.extract_stack() # type: ignore[attr-defined]
|
|
return self
|
|
|
|
# In some circumstances, a conventional torch.Tensor constructor
|
|
# will get rewritten to call into FakeTensor. We must provide an
|
|
# __init__ method that can accept the Python interpreters initialization
|
|
# in such a situation; we must also be able to handle direct fake
|
|
# tensor construction via FakeTensor().
|
|
#
|
|
# In particular, the __init__ call will look funny in the following case:
|
|
#
|
|
# with FakeTensorMode():
|
|
# x = torch.Tensor([1, 2, 3])
|
|
#
|
|
# this desugars into:
|
|
#
|
|
# with FakeTensorMode():
|
|
# x = torch.Tensor.__new__([1, 2, 3])
|
|
# # NB: x is a fake tensor, because of the mode!
|
|
# x.__init__([1, 2, 3]) # not the normal fake tensor args!
|
|
#
|
|
def __init__(self, *args, **kwargs):
|
|
super().__init__()
|
|
|
|
@staticmethod
|
|
def from_tensor(t, fake_mode):
|
|
return fake_mode.from_tensor(t)
|
|
|
|
@classmethod
|
|
@count
|
|
def __torch_dispatch__(cls, func, types, args=(), kwargs=None):
|
|
# need to handle here to avoid infinite recursion
|
|
# see [in_kernel_invocation]
|
|
if func == torch.ops.prim.device.default:
|
|
assert len(args) == 1 and isinstance(args[0], FakeTensor)
|
|
if args[0].fake_mode.in_kernel_invocation:
|
|
return torch.device("meta")
|
|
else:
|
|
return args[0].fake_device
|
|
|
|
# Because fake mode can return NotImplemented (if it sees a subclass
|
|
# it doesn't know how to deal with), this test here is important
|
|
# because the next dispatch after a fake mode will attempt to use
|
|
# subclasses of tensors to dispatch, and any FakeTensor arguments
|
|
# will be considered eligible.
|
|
unrecognized_types = [
|
|
t for t in types if not issubclass(t, FakeTensor) and t is not torch.Tensor
|
|
]
|
|
if unrecognized_types:
|
|
not_implemented_log.debug(
|
|
"FakeTensor unrecognized subclass(es): %s", unrecognized_types
|
|
)
|
|
return NotImplemented
|
|
|
|
fake_mode = None
|
|
for arg in pytree.arg_tree_leaves(*args, **kwargs):
|
|
if isinstance(arg, FakeTensor):
|
|
fake_mode = arg.fake_mode
|
|
break
|
|
|
|
assert fake_mode is not None
|
|
|
|
# If the fake mode is already active, don't try to reapply it!
|
|
# NotImplemented is the right thing to return here, because the
|
|
# typical situation this can occur is if ProxyTensorMode returned a
|
|
# NotImplemented because of a not implemented subclass; we may have
|
|
# unluckily attempted to hit FakeTensor's dispatch first,
|
|
# NotImplemented lets us keep chaining until we find the actual
|
|
# subclass
|
|
maybe_cur_fake_mode = torch._C._get_dispatch_mode(
|
|
torch._C._TorchDispatchModeKey.FAKE
|
|
)
|
|
if maybe_cur_fake_mode:
|
|
not_implemented_log.debug(
|
|
"FakeTensor mode already active: %s in %s",
|
|
fake_mode,
|
|
maybe_cur_fake_mode,
|
|
)
|
|
return NotImplemented
|
|
|
|
with fake_mode: # type: ignore[attr-defined]
|
|
return func(*args, **kwargs)
|
|
|
|
@staticmethod
|
|
def _find_common_device(func, flat_args) -> Tuple[torch.device, bool]:
|
|
# Returns: (common_device, has_scalar_only_inputs)
|
|
|
|
# cpu - zero-dim tensors can be called in cuda kernels,
|
|
# so overwrite the common_device if it the only existing
|
|
# device comes from a cpu zero-dim tensor
|
|
common_device = None
|
|
has_scalar_only_inputs = False
|
|
is_cpu_zero_dim = None
|
|
|
|
def cpu_zero_dim(t):
|
|
return t.device.type == "cpu" and t.dim() == 0
|
|
|
|
def merge_devices(t):
|
|
nonlocal common_device
|
|
nonlocal is_cpu_zero_dim
|
|
if not isinstance(t, FakeTensor):
|
|
return
|
|
|
|
if common_device is None:
|
|
common_device = t.device
|
|
is_cpu_zero_dim = cpu_zero_dim(t)
|
|
return
|
|
|
|
t_is_cpu_zero_dim = cpu_zero_dim(t)
|
|
if t.device == common_device:
|
|
if is_cpu_zero_dim:
|
|
is_cpu_zero_dim = t_is_cpu_zero_dim
|
|
return
|
|
|
|
# mismatching devices !
|
|
# if current tensor is cpu 0 dim, defer to existing device
|
|
if t_is_cpu_zero_dim:
|
|
return
|
|
|
|
# current device is from cpu 0 dim tensor, overwrite
|
|
if is_cpu_zero_dim:
|
|
common_device = t.device
|
|
is_cpu_zero_dim = t_is_cpu_zero_dim
|
|
return
|
|
|
|
# mismatching devices of non-zero dim tensors, throw
|
|
# This might be valid behavior and need to be explicitly modeled, e.g. reshape_as
|
|
raise RuntimeError(
|
|
f"Unhandled FakeTensor Device Propagation for {func}, found two different devices {common_device}, {t.device}"
|
|
)
|
|
|
|
for arg in flat_args:
|
|
merge_devices(arg)
|
|
|
|
# some functions that allow Python numbers to bind to Tensors
|
|
# if we have failed to find a device, and we're running one of these operators,
|
|
# we must have scalar only inputs
|
|
if should_allow_numbers_as_tensors(func) and common_device is None:
|
|
# ops with scalar only inputs always have result on cpu
|
|
has_scalar_only_inputs = True
|
|
common_device = torch.device("cpu")
|
|
|
|
assert common_device is not None, f"Could not find common device for {func}"
|
|
|
|
return common_device, has_scalar_only_inputs
|
|
|
|
# We must handle tolist in a special way for FakeTensors here in the case
|
|
# where tolist is called from torch dispatch for tensor subclasses.
|
|
# Ordinarily, if a program calls .tolist compiling still works because there is
|
|
# special handling in dynamo, but for tensor subclasses if .tolist is called
|
|
# inside torch dispatch, the .tolist call may be directly on a FakeTensor.
|
|
# This would result in an error since wrapper subclasses don't have storage.
|
|
# To avoid this, we handle the FakeTensor case by (1) specializing on the size
|
|
# of the tensor to create the output Python list, and (2) creating unbacked
|
|
# symints for each element of the list.
|
|
def tolist(self):
|
|
assert self.dim() == 1, "NYI for higher dims"
|
|
shape_env = self.fake_mode.shape_env
|
|
out = []
|
|
# Specialize on the length of the list
|
|
for _ in range(self.shape[0]):
|
|
s = shape_env.create_unbacked_symint()
|
|
# max value?
|
|
torch._constrain_as_size(s, min=2)
|
|
out.append(s)
|
|
return out
|
|
|
|
__torch_function__ = torch._C._disabled_torch_function_impl
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class TensorMetadata:
|
|
"""
|
|
The Tensor metadata relevant to hashing FakeTensors when caching.
|
|
"""
|
|
|
|
dtype: torch.dtype
|
|
shape: torch.Size
|
|
stride: Tuple[Any, ...]
|
|
device: torch.device
|
|
layout: torch.layout
|
|
memory_format: Optional[torch.memory_format]
|
|
storage_offset: int
|
|
requires_grad: bool
|
|
is_quantized: bool
|
|
is_conj: bool
|
|
is_neg: bool
|
|
is_inference: bool
|
|
is_sparse: bool
|
|
is_coalesced: Optional[bool]
|
|
dense_dim: Optional[int]
|
|
sparse_dim: Optional[int]
|
|
|
|
|
|
def extract_tensor_metadata(t: torch.Tensor) -> "TensorMetadata":
|
|
"""
|
|
Extract the TensorMetadata of a tensor.
|
|
"""
|
|
memory_format = suggest_memory_format(t)
|
|
if not t.is_contiguous(memory_format=memory_format):
|
|
memory_format = None
|
|
|
|
return TensorMetadata(
|
|
dtype=t.dtype,
|
|
shape=t.shape,
|
|
stride=t.stride() if t.layout == torch.strided else (),
|
|
device=t.device,
|
|
layout=t.layout,
|
|
memory_format=memory_format,
|
|
storage_offset=t.storage_offset(),
|
|
requires_grad=t.requires_grad,
|
|
is_quantized=t.is_quantized,
|
|
is_conj=t.is_conj(),
|
|
is_neg=t.is_neg(),
|
|
is_inference=t.is_inference(),
|
|
is_sparse=t.is_sparse,
|
|
is_coalesced=t.is_coalesced() if t.is_sparse else None,
|
|
dense_dim=t.dense_dim() if t.is_sparse else None,
|
|
sparse_dim=t.sparse_dim() if t.is_sparse else None,
|
|
)
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class _ShapeEnvSettings:
|
|
"""
|
|
Encapsulates all shape env settings that could potentially affect
|
|
FakeTensor dispatch. Used when creating dispatch cache keys.
|
|
"""
|
|
|
|
allow_scalar_outputs: bool
|
|
allow_dynamic_output_shape_ops: bool
|
|
assume_static_by_default: bool
|
|
specialize_zero_one: bool
|
|
duck_shape: bool
|
|
|
|
def __init__(self, env: "ShapeEnv"):
|
|
# Initialize this way because the class is frozen (to enable hashing):
|
|
object.__setattr__(self, "allow_scalar_outputs", env.allow_scalar_outputs)
|
|
object.__setattr__(
|
|
self, "allow_dynamic_output_shape_ops", env.allow_dynamic_output_shape_ops
|
|
)
|
|
object.__setattr__(
|
|
self, "assume_static_by_default", env.assume_static_by_default
|
|
)
|
|
object.__setattr__(self, "specialize_zero_one", env.specialize_zero_one)
|
|
object.__setattr__(self, "duck_shape", env.duck_shape)
|
|
|
|
|
|
class _DispatchCacheKey(list):
|
|
"""
|
|
Key for the FakeTensor dispatch cache. Inspired by (copied from)
|
|
_HashedSeq from the functools.lru_cache implementation.
|
|
"""
|
|
|
|
__slots__ = "hashvalue" # noqa: PLC0205
|
|
|
|
def __init__(self, tup, hash=hash):
|
|
self[:] = tup
|
|
self.hashvalue = hash(tup)
|
|
|
|
def __hash__(self):
|
|
return self.hashvalue
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class _DispatchCacheEntry:
|
|
"""
|
|
Entry type for the FakeTensor dispatch cache. Accounts for two possibilities:
|
|
1) The op is inplace, and a hit means we need to alias the argument at a given
|
|
index. 2) We need to synthesize a new FakeTensor given tensor metadata. For view
|
|
ops, we further capture the index of the arg to alias.
|
|
"""
|
|
|
|
inplace_idx: Optional[int] = None
|
|
metadata: Optional[TensorMetadata] = None
|
|
view_idx: Optional[int] = None
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class _BypassDispatchCache(Exception):
|
|
"""
|
|
Signals cases that should skip FakeTensor caching.
|
|
"""
|
|
|
|
reason: str
|
|
|
|
|
|
@dataclass(frozen=True)
|
|
class DispatchCacheInfo:
|
|
"""
|
|
Information about the state of the FakeTensor dispatch cache.
|
|
"""
|
|
|
|
hits: int
|
|
misses: int
|
|
bypasses: Dict[str, int]
|
|
size: int
|
|
|
|
|
|
# We keep one instantiation of `fake_tensor_converter` active
|
|
# for the duration of `with FakeTensorMode()`.
|
|
# This allows accurate storage aliasing across invocation of
|
|
# different operators. While this will keep all freshly allocated
|
|
# tensors alive during `FakeTensorMode`, there will no be no
|
|
# new allocations of Tensors which have non-meta storage so
|
|
# memory should not significantly increase.
|
|
|
|
|
|
class FakeTensorMode(TorchDispatchMode):
|
|
cache: Dict[_DispatchCacheKey, _DispatchCacheEntry] = {}
|
|
cache_hits: int = 0
|
|
cache_misses: int = 0
|
|
cache_bypasses = defaultdict(int)
|
|
|
|
def __init__(
|
|
self,
|
|
*,
|
|
allow_fallback_kernels=True,
|
|
allow_non_fake_inputs=False,
|
|
shape_env=None,
|
|
static_shapes=None,
|
|
):
|
|
log.debug("create_mode 0x%x", id(self))
|
|
self.allow_fallback_kernels = allow_fallback_kernels
|
|
self.fake_tensor_converter = FakeTensorConverter()
|
|
if static_shapes is not None:
|
|
self.static_shapes = static_shapes
|
|
else:
|
|
self.static_shapes = shape_env is None
|
|
|
|
import torch._dynamo.config
|
|
import torch._functorch.config
|
|
|
|
self.allow_meta = torch._functorch.config.fake_tensor_allow_meta
|
|
self.cache_enabled = torch._dynamo.config.fake_tensor_cache_enabled
|
|
self.cache_crosscheck_enabled = (
|
|
torch._dynamo.config.fake_tensor_cache_crosscheck_enabled
|
|
)
|
|
|
|
# A flag that controls, whether we want to invoke ops on mix of
|
|
# real weights/global variables and fake inputs
|
|
self.allow_non_fake_inputs = allow_non_fake_inputs
|
|
|
|
# [in_kernel_invocation]
|
|
# when FakeTensor is invoked in user code, .device should return
|
|
# the fake_device of the tensor so that code such as as `if x.is_cuda`
|
|
# or torch.zeros([10, 10], device=x.device) continues to execute as if
|
|
# the FakeTensor were real. However, within kernel execution, we return
|
|
# the `Meta` device because all computation within the kernels should
|
|
# behave as if the Tensors are on meta devices. Kernels should allocate
|
|
# new tensors on meta devices, and checks like `is_meta` should return true.
|
|
# within python refs, we always return the real device by defining
|
|
# the device property
|
|
self.in_kernel_invocation = False
|
|
|
|
# True if we enter'ed and actually enabled fake tensor mode,
|
|
# false if it was a no-op. Not thread safe but neither is
|
|
# in_kernel_invocation
|
|
# If another fake mode was already active when we enter, we also stash it here.
|
|
# That way when we exit, we know to re-enable the previous fake mode.
|
|
self.enter_stack: List[Tuple[bool, Optional[FakeTensorMode]]] = []
|
|
|
|
self.shape_env = shape_env
|
|
|
|
self.stack = "".join(traceback.format_stack())
|
|
|
|
# Indicates to our torch_dispatch dispatching infra that
|
|
# this is an "infra" mode with lower dispatching precedence.
|
|
self._mode_key = torch._C._TorchDispatchModeKey.FAKE
|
|
|
|
# Typically, there is only one fake tensor mode and you test for it by
|
|
# doing an isinstance test. However, in some situations, there might be
|
|
# TWO fake tensor modes. The canonical example of this is exporting
|
|
# a fake model: there is an outer fake mode created by the user, and
|
|
# an inner fake mode created by Dynamo. The two phase process is required
|
|
# because the outer fake mode typically won't have a ShapeEnv, even if
|
|
# the user is interested in exporting with dynamic shapes (so the inner
|
|
# fake mode will actually have a ShapeEnv and swap in symbolic sizes.)
|
|
#
|
|
# In this case, it's insufficient to test only one FakeTensor: you need
|
|
# to distinguish between our fake tensor and other fake tensors. That's
|
|
# what this function does.
|
|
def is_our_fake(self, t):
|
|
return isinstance(t, FakeTensor) and t.fake_mode is self
|
|
|
|
@count
|
|
def __torch_dispatch__(self, func, types, args=(), kwargs=None):
|
|
# FakeTensorMode should not be set when we're inside of it.
|
|
assert (
|
|
torch._C._get_dispatch_mode(torch._C._TorchDispatchModeKey.FAKE) is None
|
|
), func
|
|
try:
|
|
return self.dispatch(func, types, args, kwargs)
|
|
except TypeError:
|
|
log.exception("fake tensor raised TypeError")
|
|
raise
|
|
|
|
# No-op if FakeTensorMode is already in use
|
|
def __enter__(self):
|
|
maybe_prev_fake_mode = torch._C._unset_dispatch_mode(self._mode_key)
|
|
if self is not maybe_prev_fake_mode:
|
|
self.enter_stack.append((True, maybe_prev_fake_mode))
|
|
return super().__enter__()
|
|
else:
|
|
# no-op (still need to re-set the fake mode though since we unset it)
|
|
torch._C._set_dispatch_mode(self)
|
|
self.enter_stack.append((False, None))
|
|
return self
|
|
|
|
def __exit__(self, a, b, c):
|
|
live, maybe_prev_fake_mode = self.enter_stack.pop()
|
|
if live:
|
|
out = super().__exit__(a, b, c)
|
|
# Re-enable the previous fake mode, if there was one.
|
|
if maybe_prev_fake_mode is not None:
|
|
torch._C._set_dispatch_mode(maybe_prev_fake_mode)
|
|
|
|
@classmethod
|
|
def cache_info(cls) -> DispatchCacheInfo:
|
|
"""
|
|
Query the state of the dispatch cache.
|
|
"""
|
|
return DispatchCacheInfo(
|
|
FakeTensorMode.cache_hits,
|
|
FakeTensorMode.cache_misses,
|
|
dict(FakeTensorMode.cache_bypasses),
|
|
len(FakeTensorMode.cache),
|
|
)
|
|
|
|
@classmethod
|
|
def cache_clear(cls):
|
|
"""
|
|
Clear the dispatch cache.
|
|
"""
|
|
cls.cache_hits = 0
|
|
cls.cache_misses = 0
|
|
cls.cache_bypasses.clear()
|
|
cls.cache.clear()
|
|
|
|
def _cached_dispatch_impl(
|
|
self,
|
|
func: OpOverload,
|
|
types: Tuple[Any, ...],
|
|
args: Tuple[Any, ...],
|
|
kwargs: Dict[str, Any],
|
|
):
|
|
"""
|
|
Lookup a cache entry for the given arguments. If none exists, dispatch
|
|
and cache the result (if the result is eligible for caching).
|
|
"""
|
|
output = unassigned = object()
|
|
try:
|
|
key = self._cache_key(func, args, kwargs)
|
|
entry = FakeTensorMode.cache.get(key, None)
|
|
if entry is not None:
|
|
output = self._output_from_cache_entry(entry, func, args)
|
|
FakeTensorMode.cache_hits += 1
|
|
if self.cache_crosscheck_enabled:
|
|
# For debugging / testing: Validate that the output synthesized
|
|
# from the cache matches the output created by normal dispatch.
|
|
self._crosscheck_cache_output(output, func, types, args, kwargs)
|
|
else:
|
|
output = self._dispatch_impl(func, types, args, kwargs)
|
|
entry = self._make_cache_entry(key, func, args, kwargs, output)
|
|
FakeTensorMode.cache[key] = entry
|
|
FakeTensorMode.cache_misses += 1
|
|
except _BypassDispatchCache as e:
|
|
FakeTensorMode.cache_bypasses[e.reason] += 1
|
|
|
|
if output is unassigned:
|
|
output = self._dispatch_impl(func, types, args, kwargs)
|
|
|
|
return output
|
|
|
|
def _cache_key(
|
|
self,
|
|
func: OpOverload,
|
|
args: Tuple[Any, ...],
|
|
kwargs: Dict[str, Any],
|
|
) -> _DispatchCacheKey:
|
|
"""
|
|
Create a cache key given the dispatch args. Raises _BypassDispatchCache
|
|
for any situation that precludes caching.
|
|
"""
|
|
# Avoid caching for any ops that would require a more sophisticated
|
|
# caching implementation, e.g., data dependent ops or ops that modify
|
|
# the inputs.
|
|
if torch.Tag.data_dependent_output in func.tags:
|
|
raise _BypassDispatchCache("data dependent output")
|
|
|
|
if torch.Tag.dynamic_output_shape in func.tags:
|
|
raise _BypassDispatchCache("dynamic output shape")
|
|
|
|
if torch.Tag.inplace_view in func.tags:
|
|
raise _BypassDispatchCache("inplace view")
|
|
|
|
if func == aten._unsafe_view.default:
|
|
raise _BypassDispatchCache("unsafe view")
|
|
|
|
if func in self.lift_fns:
|
|
raise _BypassDispatchCache("lift")
|
|
|
|
if not torch._library.utils.is_builtin(func):
|
|
raise _BypassDispatchCache("non-builtin")
|
|
|
|
# In order to handle storage aliasing, we need to establish the alias
|
|
# for any view op on a cache hit. But CompositeImplicitAutograd ops may
|
|
# or may not alias the input, so just punt on caching these.
|
|
if func.is_view and torch._C._dispatch_has_kernel_for_dispatch_key(
|
|
func.name(), torch._C.DispatchKey.CompositeImplicitAutograd
|
|
):
|
|
raise _BypassDispatchCache("CompositeImplicitAutograd")
|
|
|
|
key_values = (
|
|
func,
|
|
# Translate any FakeTensor args to metadata.
|
|
self._prep_args_for_hash(args) if args else (),
|
|
self._prep_args_for_hash(kwargs) if kwargs else (),
|
|
# Capture the default_dtype mode since that can affect the output tensor,
|
|
# e.g., when operating on constant float values.
|
|
torch.get_default_dtype(),
|
|
# Capture the current device to support, e.g., cache tensor creation,
|
|
# where there isn't necessarily a tensor to take the device from.
|
|
torch._C._get_default_device(),
|
|
# We want to create tensors from cached metadata only when the inference
|
|
# mode is the same.
|
|
torch.is_inference_mode_enabled(),
|
|
# Shape env settings could affect behavior. One example seen in the wild:
|
|
# Disasllowing dynamic shapes can introduce a DynamicOutputShapeException
|
|
# where it wasn't seen on a previous instance of the same op.
|
|
_ShapeEnvSettings(self.shape_env) if self.shape_env else None,
|
|
)
|
|
return _DispatchCacheKey(key_values)
|
|
|
|
def _prep_args_for_hash(self, args: Any) -> Any:
|
|
"""
|
|
Translate the provided args into a form suitable for caching at FakeTensor
|
|
dispatch, i.e., convert unhashable types like lists & dicts into tuples and
|
|
convert FakeTensors into metadata. Raises _BypassDispatchCache to signal
|
|
unsupported cases that should bypass caching.
|
|
"""
|
|
if isinstance(args, dict):
|
|
args = list(args.keys()) + list(args.values())
|
|
|
|
result = []
|
|
for arg in args:
|
|
if isinstance(arg, FakeTensor):
|
|
if not self.is_our_fake(arg):
|
|
raise _BypassDispatchCache("not our fake")
|
|
if arg._has_symbolic_sizes_strides:
|
|
raise _BypassDispatchCache("symbolic shape")
|
|
if arg.constant is not None:
|
|
raise _BypassDispatchCache("constant attribute")
|
|
if arg.is_sparse:
|
|
raise _BypassDispatchCache("sparse tensor")
|
|
result.append(extract_tensor_metadata(arg))
|
|
elif isinstance(arg, torch.Tensor):
|
|
raise _BypassDispatchCache("non-fake tensor")
|
|
elif isinstance(arg, (torch.SymBool, torch.SymInt, torch.SymFloat)):
|
|
raise _BypassDispatchCache("symbolic shape")
|
|
elif isinstance(arg, (list, tuple, dict)):
|
|
result.extend(self._prep_args_for_hash(arg))
|
|
else:
|
|
# It's important to capture the type of the arg since, e.g., 1 and 1.0
|
|
# hash to the same value, but can produce different dtypes for the
|
|
# output tensor.
|
|
result.append((type(arg), arg))
|
|
|
|
return tuple(result)
|
|
|
|
def _make_cache_entry(
|
|
self,
|
|
key: _DispatchCacheKey,
|
|
func: OpOverload,
|
|
args: Tuple[Any, ...],
|
|
kwargs: Dict[str, Any],
|
|
output: FakeTensor,
|
|
) -> _DispatchCacheEntry:
|
|
"""
|
|
Make a cache entry object for the given 'output' Tensor. Raises
|
|
_BypassDispatchCache if the output tensor has characteristics that
|
|
prevent caching it.
|
|
"""
|
|
# Some ops return tuples of Tensors, but it's rare, so avoid
|
|
# the complexity of caching other types.
|
|
if not isinstance(output, FakeTensor):
|
|
raise _BypassDispatchCache("non-FakeTensor output")
|
|
|
|
# Avoid caching FakeTensors with constants attached since those
|
|
# can be invalidated.
|
|
if output.constant is not None:
|
|
raise _BypassDispatchCache("constant attribute")
|
|
|
|
# TODO: support caching sparse outputs?
|
|
if output.is_sparse:
|
|
raise _BypassDispatchCache("sparse output")
|
|
|
|
# Can an in-place op really reference a kwarg? If so, then we need
|
|
# to extend the implementation to handle it.
|
|
for kval in kwargs.values():
|
|
if id(kval) == id(output):
|
|
raise _BypassDispatchCache("kwarg aliases output")
|
|
|
|
# If this is an in-place op, the entry records which input arg is aliased.
|
|
for idx in range(len(args)):
|
|
if id(args[idx]) == id(output):
|
|
return _DispatchCacheEntry(
|
|
inplace_idx=idx, metadata=None, view_idx=None
|
|
)
|
|
|
|
# Otherwise, create an entry that records the output tensor's metadata.
|
|
view_idx = None
|
|
if func.is_view:
|
|
idxs = [i for i, t in enumerate(args) if isinstance(t, torch.Tensor)]
|
|
assert len(idxs) == 1
|
|
view_idx = idxs[0]
|
|
|
|
metadata = extract_tensor_metadata(output)
|
|
entry = _DispatchCacheEntry(
|
|
inplace_idx=None, metadata=metadata, view_idx=view_idx
|
|
)
|
|
|
|
# N.B.: Some checks for bypassing the cache would be performed on the
|
|
# output tensor synthesized from the cached metadata. As an optimization,
|
|
# we can synthesize a tensor here and do the checks on that instance.
|
|
# This approach keeps the (more frequent) cache-hit path as lightweight
|
|
# as possible.
|
|
synth_output = self._output_from_cache_entry(entry, func, args)
|
|
|
|
# Make sure the dispatch_key_set from the synthesized output tensor will
|
|
# be the same.
|
|
synth_key_set = torch._C._dispatch_key_set(synth_output)
|
|
key_set = torch._C._dispatch_key_set(output)
|
|
if synth_key_set != key_set:
|
|
raise _BypassDispatchCache("dispatch_key_set mismatch")
|
|
|
|
return entry
|
|
|
|
def _output_from_cache_entry(
|
|
self, entry: _DispatchCacheEntry, func: OpOverload, args: Tuple[Any, ...]
|
|
) -> FakeTensor:
|
|
"""
|
|
Create a new FakeTensor from the cache entry.
|
|
"""
|
|
if entry.inplace_idx is not None:
|
|
# This is an in-place op; return the aliased arg.
|
|
return args[entry.inplace_idx]
|
|
|
|
# Synthesize a new FakeTensor with the cached metadata.
|
|
metadata = entry.metadata
|
|
assert not metadata.is_sparse
|
|
|
|
empty = torch.empty_strided(
|
|
metadata.shape,
|
|
metadata.stride,
|
|
dtype=metadata.dtype,
|
|
layout=metadata.layout,
|
|
device="meta",
|
|
requires_grad=metadata.requires_grad,
|
|
)
|
|
|
|
if metadata.is_conj:
|
|
torch._C._set_conj(empty, True)
|
|
if metadata.is_neg:
|
|
torch._C._set_neg(empty, True)
|
|
|
|
if func.is_view:
|
|
# For view ops, the storage should be the same as the tensor input.
|
|
storage = args[entry.view_idx].untyped_storage()
|
|
with in_kernel_invocation_manager(self):
|
|
empty.set_(
|
|
storage, metadata.storage_offset, metadata.shape, metadata.stride
|
|
)
|
|
elif metadata.storage_offset != 0:
|
|
storage = empty.untyped_storage()
|
|
with in_kernel_invocation_manager(self):
|
|
empty.set_(
|
|
storage, metadata.storage_offset, metadata.shape, metadata.stride
|
|
)
|
|
|
|
return FakeTensor(self, empty, metadata.device)
|
|
|
|
def _crosscheck_cache_output(
|
|
self,
|
|
output: FakeTensor,
|
|
func: OpOverload,
|
|
types: Tuple[Any, ...],
|
|
args: Tuple[Any, ...],
|
|
kwargs: Dict[str, Any],
|
|
):
|
|
"""
|
|
Helper to validate that the output synthesized from the cache matches
|
|
the output created by normal dispatch.
|
|
"""
|
|
try:
|
|
true_output = self._dispatch_impl(func, types, args, kwargs)
|
|
except Exception as e:
|
|
raise RuntimeError(
|
|
f"FakeTensor cache crosscheck failure: func={func}, "
|
|
f"args={args}, kwargs={kwargs}: Dispatch raised={e}"
|
|
) from e
|
|
try:
|
|
assert_metadata_eq(assert_eq, true_output, output)
|
|
except Exception as e:
|
|
raise RuntimeError(
|
|
f"FakeTensor cache crosscheck failure: func={func}, "
|
|
f"args={args}, kwargs={kwargs}"
|
|
) from e
|
|
|
|
def dispatch(self, func, types, args=(), kwargs=None):
|
|
kwargs = kwargs or {}
|
|
log.debug("%s %s %s", func, args, kwargs)
|
|
|
|
if func in _DISPATCH_META_HANDLERS:
|
|
return _DISPATCH_META_HANDLERS[func](args)
|
|
|
|
if log.getEffectiveLevel() <= logging.DEBUG:
|
|
log.debug(
|
|
"%sFakeTensorMode.__torch_dispatch__: %s", " " * RECURSION_COUNT, func
|
|
)
|
|
# NOTE: incr is intentionally unused for a RAII pattern
|
|
incr = IncrementRecursionCount()
|
|
|
|
# Some attribute queries that can be serviced directly
|
|
# See Note [is_coalesced is dispatched]
|
|
if func in _DISPATCH_HANDLE_DIRECTLY:
|
|
# NB: no_dispatch is ok here too, this func is very simple
|
|
with in_kernel_invocation_manager(self):
|
|
return func(*args, **kwargs)
|
|
|
|
if self.cache_enabled:
|
|
return self._cached_dispatch_impl(func, types, args, kwargs)
|
|
else:
|
|
return self._dispatch_impl(func, types, args, kwargs)
|
|
|
|
def _dispatch_impl(self, func, types, args, kwargs):
|
|
flat_args, args_spec = pytree.tree_flatten((args, kwargs))
|
|
|
|
flat_arg_fake_tensors = [
|
|
t for t in flat_args if isinstance(t, FakeTensor) and self.is_our_fake(t)
|
|
]
|
|
has_symbolic_sizes = any(
|
|
i._has_symbolic_sizes_strides for i in flat_arg_fake_tensors
|
|
) or any(isinstance(a, torch.SymInt) for a in flat_args)
|
|
|
|
converter = self.fake_tensor_converter
|
|
|
|
def maybe_to_constant(t):
|
|
if isinstance(t, FakeTensor) and self.is_our_fake(t):
|
|
return t.constant
|
|
else:
|
|
return t
|
|
|
|
# To constant propagate through these functions:
|
|
# 1, If this is a lift due to a torch.tensor call,
|
|
# the input tensor is guaranteed to be a
|
|
# constant, so we keep a copy of the original argument along so
|
|
# we can query it if we're asked to item() it at some later point.
|
|
# (Note that you can always call a lift fn manually, so we do
|
|
# have to check if there are any fake tensors!)
|
|
# 2, Some functions that allow Python numbers to bind to Tensors, e.g, torch.div
|
|
if (func in self.lift_fns and not flat_arg_fake_tensors) or (
|
|
should_allow_numbers_as_tensors(func)
|
|
and not has_symbolic_sizes
|
|
and not flat_arg_fake_tensors
|
|
):
|
|
assert all(
|
|
t.constant is not None for t in flat_arg_fake_tensors
|
|
), f"{func} should not have fake inputs without constants"
|
|
const_flat_args = [maybe_to_constant(a) for a in flat_args]
|
|
const_args, const_kwargs = pytree.tree_unflatten(const_flat_args, args_spec)
|
|
out = func(*const_args, **const_kwargs)
|
|
if type(out) is torch.Tensor and self.may_turn_const(out):
|
|
# NB: not in_kernel_invocation_manager because we're doing real
|
|
# compute here
|
|
# NB: no_dispatch() here is VERY DANGEROUS (like, segfault
|
|
# dangerous) if this is actually a wrapper subclass tensor,
|
|
# therefore the exact type test above
|
|
with no_dispatch():
|
|
out = out.clone()
|
|
return converter(self, out, make_constant=True)
|
|
|
|
# See [subclass inputs] below
|
|
# NB: If you're seeing a mysterious infinite loop involving fake
|
|
# tensor, it might be related to this line. Though I'm not sure
|
|
# how you'll know to read this comment, as this line won't show up
|
|
# in the stack trace.
|
|
unrecognized_types = self.check_for_subclass(flat_args)
|
|
if unrecognized_types:
|
|
not_implemented_log.debug(
|
|
"FakeTensorMode unrecognized subclass(es): %s", unrecognized_types
|
|
)
|
|
return NotImplemented
|
|
|
|
# if we are in the dispatch mode, we will enter this function even if the inputs
|
|
# are not FakeTensors. For now, throw if any non-Fake Tensor inputs
|
|
# and just support constructors.
|
|
|
|
# this is generated from torch.tensor(), which does not use the
|
|
# dispatcher, to allow wrapper subclasses to wrap the new tensor
|
|
if func in self.lift_fns:
|
|
assert len(kwargs) == 0 and len(args) == 1, f"{args} {kwargs}"
|
|
|
|
if type(args[0]) is torch.Tensor:
|
|
return converter(self, args[0])
|
|
|
|
# Recompute flat_arg_fake_tensors here again in case some of the inputs
|
|
# were real tensors and fakified in validate_and_convert_non_fake_tensors
|
|
(flat_args, flat_arg_fake_tensors) = self.validate_and_convert_non_fake_tensors(
|
|
func, converter, flat_args, args_spec
|
|
)
|
|
del args, kwargs # Invalidated
|
|
|
|
# The current constant handling only support tracing systems
|
|
# (aot autograd, torchdynamo) where each operation is run consecutively.
|
|
# Because each operation is run in order, we can trace out and support
|
|
# sequences like: x = torch.tensor(0.); y = x.add_(1)
|
|
# Whenver a constant is written to but with inputs that cannot be evaluated
|
|
# statically, such as random_(), we invalidate all constants that alias the input
|
|
# We will rely on functionalization for use of fake tensors constants as persistent
|
|
# objects on an FX Graph.
|
|
|
|
# We dispatch size/stride/numel on the FakeTensor not its constant, so bail on inplace_view
|
|
all_constant = all(e.constant is not None for e in flat_arg_fake_tensors)
|
|
if (
|
|
torch.Tag.nondeterministic_seeded not in func.tags
|
|
and torch.Tag.inplace_view not in func.tags
|
|
and all_constant
|
|
and len(flat_arg_fake_tensors) != 0
|
|
and not has_symbolic_sizes
|
|
):
|
|
const_flat_args = [maybe_to_constant(a) for a in flat_args]
|
|
const_args, const_kwargs = pytree.tree_unflatten(const_flat_args, args_spec)
|
|
|
|
# NB: not in_kernel_invocation_manager(self) as we want to do REAL
|
|
# compute
|
|
with no_dispatch():
|
|
out = func(*const_args, **const_kwargs)
|
|
|
|
flat_out = pytree.tree_leaves(out)
|
|
flat_out_tensors = [t for t in flat_out if isinstance(t, torch.Tensor)]
|
|
all_constant = all(self.may_turn_const(t) for t in flat_out_tensors)
|
|
|
|
if all_constant:
|
|
return pytree.tree_map_only(
|
|
torch.Tensor,
|
|
lambda t: converter(self, t, make_constant=True),
|
|
out,
|
|
)
|
|
|
|
# we weren't able to turn outputs to constants,
|
|
# so invalidate all constants that might be aliases of the outputs
|
|
for ten in flat_out_tensors:
|
|
converter.invalidate_constant_aliases(ten)
|
|
|
|
# we are falling through to running non constant tensors, any input constant that
|
|
# is written to must be invalidated
|
|
args, kwargs = pytree.tree_unflatten(flat_args, args_spec)
|
|
self.invalidate_written_to_constants(func, flat_arg_fake_tensors, args, kwargs)
|
|
|
|
# Try for fastpath
|
|
if has_symbolic_sizes:
|
|
fast_impl = get_fast_op_impls().get(func)
|
|
if fast_impl is not None:
|
|
return fast_impl(self, *args, **kwargs)
|
|
|
|
# If there's a Python meta, prefer that over the decomposition
|
|
from torch._decomp import meta_table as meta_table
|
|
|
|
if func not in meta_table and not self.cpp_meta_supports_symint(func):
|
|
from torch._decomp import decomposition_table
|
|
|
|
# Prefer Python decompositions over C++ ones
|
|
if func in decomposition_table and (
|
|
has_symbolic_sizes
|
|
or (
|
|
# TODO: Remove these exclusions, so that we can remove
|
|
# this leg entirely
|
|
torch_decomp_decompositions(func)
|
|
and all(not e.is_sparse for e in flat_arg_fake_tensors)
|
|
)
|
|
):
|
|
with self:
|
|
return decomposition_table[func](*args, **kwargs)
|
|
|
|
with self:
|
|
# Decomposes CompositeImplicitAutograd ops
|
|
r = func.decompose(*args, **kwargs)
|
|
if r is not NotImplemented:
|
|
return r
|
|
|
|
# prims already wrap FakeTensor inputs to FakeTensor outputs
|
|
# and do device logic, we dont need do anything but run them
|
|
# and ensure that Meta kernels are dispatched to (see)
|
|
# Fake Tensor Dispatch Keys
|
|
# TODO - we should be use the prim aten impl
|
|
# TODO - fix prims complex ops
|
|
if (
|
|
"prims::" in func._schema.name
|
|
and hasattr(func, "prim_meta_impl")
|
|
and not stride_incorrect_op(func)
|
|
):
|
|
with self:
|
|
return func.prim_meta_impl(*args, **kwargs)
|
|
|
|
# Users can register FakeTensor rules for custom operators
|
|
# Call them if they exist.
|
|
maybe_abstract_impl = torch._library.simple_registry.singleton.find(
|
|
func.name()
|
|
).abstract_impl.kernel
|
|
if maybe_abstract_impl:
|
|
ctx = torch._library.abstract_impl.AbstractImplCtx(self.shape_env, func)
|
|
with torch._library.abstract_impl.set_ctx_getter(lambda: ctx), self:
|
|
result = maybe_abstract_impl(*args, **kwargs)
|
|
return result
|
|
|
|
# special handling for funcs registered through `register_op_impl`,
|
|
# e.g., manipulating args on constructor calls to construct meta tensors
|
|
# and then afterwards wrapping them to a FakeTensor
|
|
for run_impl_check, op_impl in op_implementations_checks:
|
|
if run_impl_check(func):
|
|
op_impl_out = op_impl(self, func, *args, **kwargs)
|
|
if op_impl_out != NotImplemented:
|
|
return op_impl_out
|
|
|
|
def maybe_run_unsafe_fallback(error=None):
|
|
# We infer the meta of a custom ops that return None to just
|
|
# return None. custom ops are not allowed to mutate metadata
|
|
# of their inputs, so this is safe.
|
|
if can_generate_trivial_abstract_impl(func):
|
|
return None
|
|
# no meta kernel registered, fallback to kernel for the device
|
|
if has_symbolic_sizes or not self.can_run_unsafe_fallback(func):
|
|
raise UnsupportedOperatorException(func)
|
|
if error is None:
|
|
error = UnsupportedOperatorException(func)
|
|
return run_fallback_kernel(self, func, flat_args, args_spec, error)
|
|
|
|
# Optimization: If there is no Meta kernel, it takes a surprisingly long
|
|
# amount of time to catch the NotImplementedError, so we check it here.
|
|
if not has_meta(func):
|
|
return maybe_run_unsafe_fallback()
|
|
|
|
# run kernel registered to meta for func, which include
|
|
# python meta registrations, prims, decomps, and c++ meta fns (structured kernels)
|
|
# It's possible that the kernel will return NotImplementedError
|
|
try:
|
|
with in_kernel_invocation_manager(self):
|
|
r = func(*args, **kwargs)
|
|
except NotImplementedError as not_implemented_error:
|
|
return maybe_run_unsafe_fallback(not_implemented_error)
|
|
|
|
return self.wrap_meta_outputs_with_default_device_logic(
|
|
r, func, flat_args, device=kwargs.get("device")
|
|
)
|
|
|
|
# WARNING: DO NOT add any additional namespaces/operators here if they refer to operators
|
|
# outside of the pytorch/pytorch library! Any pre-existing things here
|
|
# are either in the pytorch/pytorch library or have been grandfathered in.
|
|
# The fallback does not always work and MAY CRASH and emit unreadable error messages
|
|
# so it should not be allowed by default.
|
|
_can_run_unsafe_fallback_allowed_namespaces = ordered_set(
|
|
"debugprims",
|
|
"prims",
|
|
"aten",
|
|
"xla",
|
|
"vision",
|
|
"torchtext",
|
|
"torchaudio",
|
|
"quantized",
|
|
)
|
|
|
|
def can_run_unsafe_fallback(self, func: OpOverload):
|
|
if not self.allow_fallback_kernels:
|
|
return False
|
|
# It's OK to try the fallback for built-in ops (e.g. aten, prims)
|
|
# because we control and test these but the fallback leads to unexpected behavior
|
|
# in user-defined custom ops
|
|
return (
|
|
func.namespace in self._can_run_unsafe_fallback_allowed_namespaces
|
|
or func.name() == "fbgemm::gmm"
|
|
)
|
|
|
|
# [subclass inputs]
|
|
# Suppose we enable fake tensor mode. This means that fake tensor
|
|
# mode will run first. But what if we do an operation that
|
|
# involves a tensor subclass that will desugar into normal tensor
|
|
# operations? Without returning NotImplemented, fake tensor mode will run first,
|
|
# decide that a conversion was made (since there was a non fake
|
|
# tensor argument), and report an error that converting non
|
|
# fake tensor is not supported. What we actually wanted to happen
|
|
# was to give the subclass a chance to figure out what it wants to
|
|
# before erroring out. Returning NotImplemented here allows this.
|
|
def check_for_subclass(self, flat_args):
|
|
def check(x):
|
|
return (
|
|
isinstance(x, torch.Tensor)
|
|
and not isinstance(x, FakeTensor)
|
|
and type(x) is not torch.Tensor
|
|
and type(x) is not torch.nn.Parameter
|
|
)
|
|
|
|
return [type(x) for x in flat_args if check(x)]
|
|
|
|
def validate_and_convert_non_fake_tensors(
|
|
self, func, converter, flat_args, args_spec
|
|
):
|
|
"""
|
|
Checks if the list of tensors are fake tensors.
|
|
If not, try to convert them to fake tensors.
|
|
Returns the original args, kwargs, and a flattened list of (args, kwargs) that are fake tensors.
|
|
"""
|
|
flat_arg_fake_tensors = []
|
|
|
|
def validate(x):
|
|
if not isinstance(x, torch.Tensor):
|
|
return x
|
|
|
|
nonlocal flat_arg_fake_tensors
|
|
if not self.is_our_fake(x):
|
|
if torch.Tag.inplace_view in func.tags:
|
|
args, kwargs = pytree.tree_unflatten(flat_args, args_spec)
|
|
raise Exception(
|
|
f"Can't call metadata mutating ops on non-Fake Tensor inputs. Found in {render_call(func, args, kwargs)}"
|
|
)
|
|
if not self.allow_non_fake_inputs:
|
|
if isinstance(x, FakeTensor) and x.fake_mode is not self:
|
|
raise AssertionError("Mixing fake modes NYI")
|
|
args, kwargs = pytree.tree_unflatten(flat_args, args_spec)
|
|
raise Exception(
|
|
f"Please convert all Tensors to FakeTensors first or instantiate FakeTensorMode "
|
|
f"with 'allow_non_fake_inputs'. Found in {render_call(func, args, kwargs)}"
|
|
)
|
|
|
|
x = converter(self, x)
|
|
|
|
flat_arg_fake_tensors.append(x)
|
|
return x
|
|
|
|
validated_args = [validate(a) for a in flat_args]
|
|
return validated_args, flat_arg_fake_tensors
|
|
|
|
def wrap_meta_outputs_with_default_device_logic(self, r, func, flat_args, device):
|
|
converter = self.fake_tensor_converter
|
|
|
|
# Lazily initialized, in case there are no tensor returns
|
|
common_device = None
|
|
has_scalar_only_inputs = False
|
|
|
|
def wrap(e):
|
|
nonlocal common_device
|
|
nonlocal has_scalar_only_inputs
|
|
|
|
if isinstance(e, torch.Tensor) and common_device is None:
|
|
(
|
|
common_device,
|
|
has_scalar_only_inputs,
|
|
) = FakeTensor._find_common_device(func, flat_args)
|
|
|
|
if self.is_our_fake(e):
|
|
torch._check(
|
|
e.device == common_device,
|
|
lambda: f"FakeTensor is wrapped to wrong device, found {e.device}, expected {common_device}",
|
|
)
|
|
|
|
if (
|
|
isinstance(e, torch.Tensor)
|
|
and not self.is_our_fake(e)
|
|
and converter is not None
|
|
):
|
|
if has_scalar_only_inputs:
|
|
# Under FakeTensorMode, op accepts scalar only inputs, such as aten.add/sub/mul/div,
|
|
# returns a real scalar tensor on CPU. See TensorMeta() in _prims/__init__.py for details.
|
|
# We thus directly convert real tensor to fake tensor.
|
|
return converter(self, e)
|
|
else:
|
|
return converter.from_meta_and_device(
|
|
self, e, device or common_device
|
|
)
|
|
else:
|
|
return e
|
|
|
|
return tree_map(wrap, r)
|
|
|
|
_cpp_meta_supports_symint = ordered_set(
|
|
aten.empty.memory_format,
|
|
aten.empty_strided.default,
|
|
aten.as_strided_scatter.default,
|
|
aten.as_strided.default,
|
|
aten.as_strided_.default,
|
|
aten.zeros.default,
|
|
aten.detach.default,
|
|
aten.view_as_real.default,
|
|
aten.view_as_complex.default,
|
|
aten.set_.source_Storage_storage_offset,
|
|
aten._sparse_coo_tensor_with_dims_and_tensors.default,
|
|
)
|
|
|
|
def cpp_meta_supports_symint(self, func):
|
|
if torch.Tag.view_copy in func.tags:
|
|
return True
|
|
return func in self._cpp_meta_supports_symint
|
|
|
|
lift_fns = ordered_set(aten.lift_fresh.default, aten.lift_fresh_copy.default)
|
|
|
|
def may_turn_const(self, t):
|
|
return (
|
|
t.numel() <= CONSTANT_NUMEL_LIMIT
|
|
and not t.is_sparse
|
|
and not self.is_our_fake(t)
|
|
and not t.device.type == "meta"
|
|
)
|
|
|
|
def invalidate_written_to_constants(
|
|
self, func, flat_arg_fake_tensors, args, kwargs
|
|
):
|
|
any_constant = any(e.constant is not None for e in flat_arg_fake_tensors)
|
|
schema_info = get_schema_info(func)
|
|
if any_constant and schema_info.is_mutable():
|
|
_, new_kwargs = normalize_function(
|
|
func, args=args, kwargs=kwargs, normalize_to_only_use_kwargs=True
|
|
)
|
|
for k, v in new_kwargs.items():
|
|
k = k if (k != "input" or schema_info.has_argument(k)) else "self"
|
|
if (
|
|
self.is_our_fake(v)
|
|
and schema_info.is_mutable(k)
|
|
and v.constant is not None
|
|
):
|
|
self.fake_tensor_converter.invalidate_constant_aliases(v.constant)
|
|
|
|
def from_tensor(
|
|
self,
|
|
tensor,
|
|
*,
|
|
static_shapes=None,
|
|
source: Optional[Source] = None,
|
|
symbolic_context=None,
|
|
# Setting this flag will force FakeTensorMode to return `None` if attempting to convert a tensor we have not
|
|
# seen before.
|
|
memoized_only=False,
|
|
):
|
|
shape_env = self.shape_env
|
|
if static_shapes is None:
|
|
static_shapes = self.static_shapes
|
|
if static_shapes:
|
|
assert (
|
|
symbolic_context is None
|
|
), "cannot set both static_shapes and symbolic_context"
|
|
shape_env = None
|
|
# see note [Tensor Fakification and Symbol Caching]
|
|
if not symbolic_context and not source and not static_shapes:
|
|
if tracing_context := torch._guards.TracingContext.try_get():
|
|
if tensor in tracing_context.tensor_to_context:
|
|
symbolic_context = tracing_context.tensor_to_context[tensor]
|
|
source = symbolic_context.tensor_source
|
|
return self.fake_tensor_converter(
|
|
self,
|
|
tensor,
|
|
shape_env=shape_env,
|
|
source=source,
|
|
symbolic_context=symbolic_context,
|
|
memoized_only=memoized_only,
|
|
)
|
|
|
|
|
|
# NB: returns fake tensors
|
|
def run_fallback_kernel(
|
|
fake_mode, func, flat_args, args_spec, orig_not_implemented_exception
|
|
):
|
|
# these should all be supported, just to be safe
|
|
# avoid fallback for operators which inplace modify metadata
|
|
# because the input fake tensors would be umodified
|
|
if torch.Tag.inplace_view in func.tags:
|
|
raise orig_not_implemented_exception
|
|
|
|
inp_impls = {}
|
|
|
|
# Don't use in_kernel_invocation_manager(fake_mode) as we want to do
|
|
# REAL compute (not with meta device)
|
|
with no_dispatch():
|
|
|
|
def to_real_tensor(e):
|
|
if fake_mode.is_our_fake(e):
|
|
out = torch.zeros_like(e, device=e.fake_device)
|
|
if e.is_sparse:
|
|
out._coalesced_(e.is_coalesced())
|
|
inp_impls[id(out)] = e
|
|
return out
|
|
return e
|
|
|
|
flat_args = [to_real_tensor(a) for a in flat_args]
|
|
args, kwargs = pytree.tree_unflatten(flat_args, args_spec)
|
|
|
|
r = func(*args, **kwargs)
|
|
|
|
tensor_impls = set()
|
|
storages = set()
|
|
|
|
for e in flat_args:
|
|
if isinstance(e, torch.Tensor):
|
|
if not e.is_sparse:
|
|
storages.add(e._typed_storage()._cdata)
|
|
|
|
# TODO: also check metadata change on inputs
|
|
# proper aliasing/metadata relationship between outputs and inputs will
|
|
# not be set up, bc of conversion to device, unless we can reuse an
|
|
# input impl
|
|
|
|
def map_out(e):
|
|
if id(e) not in inp_impls and (
|
|
isinstance(e, torch.Tensor)
|
|
and not e.is_sparse
|
|
and e._typed_storage()._cdata in storages
|
|
):
|
|
raise orig_not_implemented_exception
|
|
|
|
if isinstance(e, torch.Tensor):
|
|
if id(e) in inp_impls:
|
|
return inp_impls[id(e)]
|
|
else:
|
|
return fake_mode.fake_tensor_converter(fake_mode, e)
|
|
else:
|
|
return e
|
|
|
|
return pytree.tree_map(map_out, r)
|
|
|
|
|
|
def can_generate_trivial_abstract_impl(op: torch._ops.OpOverload) -> bool:
|
|
assert isinstance(op, torch._ops.OpOverload)
|
|
if torch._library.utils.is_builtin(op):
|
|
# We control the built-ins. These may (in rare cases)
|
|
# do input metadata mutation (which we have banned on custom ops)
|
|
return False
|
|
schema = op._schema
|
|
# It's suspicious if the op is not mutable but returns nothing, so we return False out of an abundance of caution
|
|
if not schema.is_mutable:
|
|
return False
|
|
if len(schema.returns) > 0:
|
|
return False
|
|
# If the op returns nothing, then it has a trivial abstract impl.
|
|
return True
|
|
|
|
|
|
# Just for use to allow copying a module to fake tensors,
|
|
# does not apply elsewhere
|
|
class FakeCopyMode(TorchFunctionMode):
|
|
def __init__(self, fake_mode):
|
|
self.fake_mode = fake_mode
|
|
|
|
def __torch_function__(self, func, types, args=(), kwargs=None):
|
|
kwargs = kwargs if kwargs else {}
|
|
|
|
# clone will get called in Parameter deepcopy
|
|
if func == torch._C.TensorBase.clone:
|
|
return func(
|
|
self.fake_mode.from_tensor(args[0], static_shapes=True), **kwargs
|
|
)
|
|
elif func == torch.Tensor.__deepcopy__:
|
|
assert len(args) == 2 and len(kwargs) == 0
|
|
tensor, memo = args
|
|
|
|
if id(tensor) in memo:
|
|
return memo[id(tensor)]
|
|
|
|
out = self.fake_mode.from_tensor(tensor, static_shapes=True)
|
|
memo[id(tensor)] = out
|
|
return out
|
|
else:
|
|
with torch._C.DisableTorchFunctionSubclass():
|
|
return func(*args, **kwargs)
|
|
|
|
|
|
def _device_handler(args):
|
|
# NB: Don't use is_our_fake, just serve the fake information
|
|
# as is. Notice we don't use 'self'; we use args[0].fake_mode
|
|
# because they may not be the same. It would also be possible
|
|
# to return NotImplemented here, in which case the FakeTensor
|
|
# handler on args[0] would handle it, but we're being nice and
|
|
# short-circuiting quickly.
|
|
assert len(args) == 1 and isinstance(args[0], FakeTensor)
|
|
if args[0].fake_mode.in_kernel_invocation:
|
|
return torch.device("meta")
|
|
else:
|
|
return args[0].fake_device
|
|
|
|
|
|
_DISPATCH_META_HANDLERS = {
|
|
torch.ops.prim.device.default: _device_handler,
|
|
torch.ops.aten.size.default: lambda args: tuple(int(s) for s in args[0].size()),
|
|
torch.ops.aten.stride.default: lambda args: tuple(int(s) for s in args[0].stride()),
|
|
torch.ops.aten.storage_offset.default: lambda args: int(args[0].storage_offset()),
|
|
}
|
|
|
|
_DISPATCH_HANDLE_DIRECTLY = ordered_set(
|
|
torch.ops.aten.is_coalesced.default,
|
|
torch.ops.aten.dense_dim.default,
|
|
torch.ops.aten.sparse_dim.default,
|
|
)
|
|
|
|
from torch._subclasses.fake_impls import ( # noqa: F401
|
|
_device_not_kwarg_ops, # noqa: F401
|
|
_is_tensor_constructor, # noqa: F401
|
|
_like_tensor_constructors, # noqa: F401
|
|
contains_tensor_types, # noqa: F401
|
|
get_fast_op_impls,
|
|
has_meta,
|
|
op_implementations_checks,
|
|
stride_incorrect_op,
|
|
)
|