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https://github.com/pytorch/pytorch.git
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0ce233b8ca
This PR adds support for export to unwrap/wrap subclasses AOT so that we can trace through subclass parameters. This will resolve the UX issue in torchao where users had to manually unwrap their subclasses before calling export. Differential Revision: [D67531057](https://our.internmc.facebook.com/intern/diff/D67531057) Pull Request resolved: https://github.com/pytorch/pytorch/pull/141941 Approved by: https://github.com/bdhirsh
641 lines
22 KiB
Python
641 lines
22 KiB
Python
# mypy: allow-untyped-defs
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import dataclasses
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from enum import auto, Enum
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from typing import Collection, Dict, List, Mapping, Optional, Set, TYPE_CHECKING, Union
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from torch._library.fake_class_registry import FakeScriptObject
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from torch._subclasses.fake_tensor import is_fake
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if TYPE_CHECKING:
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import torch
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from torch._functorch._aot_autograd.schemas import GraphSignature
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__all__ = [
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"ConstantArgument",
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"CustomObjArgument",
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"ExportBackwardSignature",
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"ExportGraphSignature",
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"InputKind",
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"InputSpec",
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"OutputKind",
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"OutputSpec",
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"SymIntArgument",
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"SymFloatArgument",
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"SymBoolArgument",
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"TensorArgument",
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]
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@dataclasses.dataclass
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class TensorArgument:
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name: str
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@dataclasses.dataclass
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class TokenArgument:
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name: str
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@dataclasses.dataclass
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class SymIntArgument:
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name: str
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@dataclasses.dataclass
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class SymFloatArgument:
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name: str
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@dataclasses.dataclass
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class SymBoolArgument:
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name: str
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@dataclasses.dataclass
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class CustomObjArgument:
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name: str
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class_fqn: str
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fake_val: Optional[FakeScriptObject] = None
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@dataclasses.dataclass
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class ConstantArgument:
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name: str
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value: Union[int, float, bool, str, None]
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ArgumentSpec = Union[
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TensorArgument,
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SymIntArgument,
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SymFloatArgument,
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SymBoolArgument,
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ConstantArgument,
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CustomObjArgument,
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TokenArgument,
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]
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class InputKind(Enum):
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USER_INPUT = auto()
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PARAMETER = auto()
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BUFFER = auto()
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CONSTANT_TENSOR = auto()
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CUSTOM_OBJ = auto()
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TOKEN = auto()
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@dataclasses.dataclass
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class InputSpec:
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kind: InputKind
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arg: ArgumentSpec
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target: Optional[str]
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persistent: Optional[bool] = None
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def __post_init__(self):
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if self.kind == InputKind.BUFFER:
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assert (
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self.persistent is not None
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), "Failed to specify persistent flag on BUFFER."
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assert isinstance(
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self.arg,
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(
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TensorArgument,
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SymIntArgument,
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SymFloatArgument,
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SymBoolArgument,
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ConstantArgument,
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CustomObjArgument,
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TokenArgument,
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),
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), f"got {type(self.arg)}"
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class OutputKind(Enum):
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USER_OUTPUT = auto()
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LOSS_OUTPUT = auto()
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BUFFER_MUTATION = auto()
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GRADIENT_TO_PARAMETER = auto()
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GRADIENT_TO_USER_INPUT = auto()
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USER_INPUT_MUTATION = auto()
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TOKEN = auto()
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@dataclasses.dataclass
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class OutputSpec:
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kind: OutputKind
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arg: ArgumentSpec
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target: Optional[str]
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def __post_init__(self):
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assert isinstance(
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self.arg,
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(
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TensorArgument,
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SymIntArgument,
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SymFloatArgument,
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SymBoolArgument,
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ConstantArgument,
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TokenArgument,
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CustomObjArgument,
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),
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), self.arg
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@dataclasses.dataclass
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class ExportBackwardSignature:
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gradients_to_parameters: Dict[str, str]
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gradients_to_user_inputs: Dict[str, str]
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loss_output: str
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@dataclasses.dataclass
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class ExportGraphSignature:
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"""
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:class:`ExportGraphSignature` models the input/output signature of Export Graph,
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which is a fx.Graph with stronger invariants gurantees.
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Export Graph is functional and does not access "states" like parameters
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or buffers within the graph via ``getattr`` nodes. Instead, :func:`export`
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gurantees that parameters, buffers, and constant tensors are lifted out of
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the graph as inputs. Similarly, any mutations to buffers are not included
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in the graph either, instead the updated values of mutated buffers are
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modeled as additional outputs of Export Graph.
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The ordering of all inputs and outputs are::
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Inputs = [*parameters_buffers_constant_tensors, *flattened_user_inputs]
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Outputs = [*mutated_inputs, *flattened_user_outputs]
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e.g. If following module is exported::
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class CustomModule(nn.Module):
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def __init__(self) -> None:
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super(CustomModule, self).__init__()
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# Define a parameter
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self.my_parameter = nn.Parameter(torch.tensor(2.0))
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# Define two buffers
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self.register_buffer('my_buffer1', torch.tensor(3.0))
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self.register_buffer('my_buffer2', torch.tensor(4.0))
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def forward(self, x1, x2):
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# Use the parameter, buffers, and both inputs in the forward method
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output = (x1 + self.my_parameter) * self.my_buffer1 + x2 * self.my_buffer2
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# Mutate one of the buffers (e.g., increment it by 1)
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self.my_buffer2.add_(1.0) # In-place addition
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return output
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Resulting Graph would be::
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graph():
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%arg0_1 := placeholder[target=arg0_1]
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%arg1_1 := placeholder[target=arg1_1]
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%arg2_1 := placeholder[target=arg2_1]
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%arg3_1 := placeholder[target=arg3_1]
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%arg4_1 := placeholder[target=arg4_1]
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%add_tensor := call_function[target=torch.ops.aten.add.Tensor](args = (%arg3_1, %arg0_1), kwargs = {})
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%mul_tensor := call_function[target=torch.ops.aten.mul.Tensor](args = (%add_tensor, %arg1_1), kwargs = {})
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%mul_tensor_1 := call_function[target=torch.ops.aten.mul.Tensor](args = (%arg4_1, %arg2_1), kwargs = {})
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%add_tensor_1 := call_function[target=torch.ops.aten.add.Tensor](args = (%mul_tensor, %mul_tensor_1), kwargs = {})
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%add_tensor_2 := call_function[target=torch.ops.aten.add.Tensor](args = (%arg2_1, 1.0), kwargs = {})
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return (add_tensor_2, add_tensor_1)
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Resulting ExportGraphSignature would be::
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ExportGraphSignature(
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input_specs=[
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InputSpec(kind=<InputKind.PARAMETER: 2>, arg=TensorArgument(name='arg0_1'), target='my_parameter'),
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InputSpec(kind=<InputKind.BUFFER: 3>, arg=TensorArgument(name='arg1_1'), target='my_buffer1'),
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InputSpec(kind=<InputKind.BUFFER: 3>, arg=TensorArgument(name='arg2_1'), target='my_buffer2'),
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InputSpec(kind=<InputKind.USER_INPUT: 1>, arg=TensorArgument(name='arg3_1'), target=None),
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InputSpec(kind=<InputKind.USER_INPUT: 1>, arg=TensorArgument(name='arg4_1'), target=None)
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],
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output_specs=[
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OutputSpec(kind=<OutputKind.BUFFER_MUTATION: 3>, arg=TensorArgument(name='add_2'), target='my_buffer2'),
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OutputSpec(kind=<OutputKind.USER_OUTPUT: 1>, arg=TensorArgument(name='add_1'), target=None)
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]
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)
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"""
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input_specs: List[InputSpec]
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output_specs: List[OutputSpec]
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# A list of parameters uniquely identified by mangled fully qualified name
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@property
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def parameters(self) -> Collection[str]:
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return tuple(
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s.target
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for s in self.input_specs
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if s.kind == InputKind.PARAMETER
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if isinstance(s.target, str)
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)
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# A list of buffers uniquely identified by mangled fully qualified name
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@property
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def buffers(self) -> Collection[str]:
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return tuple(
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s.target
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for s in self.input_specs
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if s.kind == InputKind.BUFFER
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if isinstance(s.target, str)
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)
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@property
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def non_persistent_buffers(self) -> Collection[str]:
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return tuple(
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s.target
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for s in self.input_specs
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if s.kind == InputKind.BUFFER
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if s.persistent is False
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if isinstance(s.target, str)
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)
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# A list of lifted constant tensors
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@property
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def lifted_tensor_constants(self) -> Collection[str]:
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return tuple(
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s.target
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for s in self.input_specs
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if s.kind == InputKind.CONSTANT_TENSOR
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if isinstance(s.target, str)
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)
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@property
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def lifted_custom_objs(self) -> Collection[str]:
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return tuple(
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s.target
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for s in self.input_specs
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if s.kind == InputKind.CUSTOM_OBJ
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if isinstance(s.target, str)
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)
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# Graph node names of pytree-flattened inputs of original program
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@property
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def user_inputs(self) -> Collection[Union[int, float, bool, None, str]]:
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user_inputs: List[Union[int, float, bool, None, str]] = []
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for s in self.input_specs:
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if s.kind != InputKind.USER_INPUT:
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continue
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if isinstance(
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s.arg,
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(
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TensorArgument,
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SymIntArgument,
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SymFloatArgument,
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SymBoolArgument,
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CustomObjArgument,
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),
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):
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user_inputs.append(s.arg.name)
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elif isinstance(s.arg, ConstantArgument):
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user_inputs.append(s.arg.value)
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else:
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raise RuntimeError(f"{s.arg} is not a valid user inputs")
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return tuple(user_inputs)
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# Graph node names of pytree-flattened outputs of original program
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# For joint-graph purposes, will include the loss output.
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@property
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def user_outputs(self) -> Collection[Union[int, float, bool, None, str]]:
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user_outputs: List[Union[int, float, bool, None, str]] = []
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for s in self.output_specs:
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if s.kind not in [
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OutputKind.USER_OUTPUT,
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OutputKind.LOSS_OUTPUT,
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]:
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continue
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if isinstance(
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s.arg,
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(TensorArgument, SymIntArgument, SymFloatArgument, SymBoolArgument),
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):
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user_outputs.append(s.arg.name)
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elif isinstance(s.arg, ConstantArgument):
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user_outputs.append(s.arg.value)
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elif isinstance(s.arg, CustomObjArgument):
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user_outputs.append(s.arg.name)
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else:
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raise RuntimeError(f"{s.arg} is not a valid user output")
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return tuple(user_outputs)
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# A dictionary mapping graph input node names to parameters. If a graph input
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# name is found in this dictionary, it is guranteed to be a lifted parameter.
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@property
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def inputs_to_parameters(self) -> Mapping[str, str]:
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return _immutable_dict(
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(s.arg.name, s.target)
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for s in self.input_specs
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if s.kind == InputKind.PARAMETER
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and isinstance(s.arg, TensorArgument)
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and isinstance(s.target, str)
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)
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# A dictionary mapping graph input node names to buffers. If a graph input
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# name is found in this dictionary, it is guranteed to be a lifted buffer.
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@property
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def inputs_to_buffers(self) -> Mapping[str, str]:
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return _immutable_dict(
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(s.arg.name, s.target) # type: ignore[union-attr, misc]
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for s in self.input_specs
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if s.kind == InputKind.BUFFER
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and isinstance(s.arg, TensorArgument)
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and isinstance(s.target, str)
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)
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# A dictionary mapping graph output node names to buffers that are mutated in the
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# original program. Buffers that are not mutated will not be found in this dictionary.
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@property
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def buffers_to_mutate(self) -> Mapping[str, str]:
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return _immutable_dict(
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(s.arg.name, s.target)
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for s in self.output_specs
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if s.kind == OutputKind.BUFFER_MUTATION
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and isinstance(s.arg, TensorArgument)
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and isinstance(s.target, str)
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)
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@property
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def user_inputs_to_mutate(self) -> Mapping[str, str]:
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return _immutable_dict(
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(s.arg.name, s.target)
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for s in self.output_specs
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if s.kind == OutputKind.USER_INPUT_MUTATION
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and isinstance(s.arg, TensorArgument)
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and isinstance(s.target, str)
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)
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# A dictionary mapping graph input node names to lifted tensor constants.
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@property
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def inputs_to_lifted_tensor_constants(self) -> Mapping[str, str]:
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return _immutable_dict(
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(s.arg.name, s.target)
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for s in self.input_specs
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if s.kind == InputKind.CONSTANT_TENSOR
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and isinstance(s.arg, TensorArgument)
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and isinstance(s.target, str)
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)
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@property
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def inputs_to_lifted_custom_objs(self) -> Mapping[str, str]:
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return _immutable_dict(
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(s.arg.name, s.target)
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for s in self.input_specs
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if s.kind == InputKind.CUSTOM_OBJ
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and isinstance(s.arg, CustomObjArgument)
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and isinstance(s.target, str)
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)
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@property
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def backward_signature(self) -> Optional[ExportBackwardSignature]:
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loss_output = None
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gradients_to_parameters: Dict[str, str] = {}
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gradients_to_user_inputs: Dict[str, str] = {}
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for spec in self.output_specs:
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if spec.kind == OutputKind.LOSS_OUTPUT:
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assert loss_output is None
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assert isinstance(spec.arg, TensorArgument)
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loss_output = spec.arg.name
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elif spec.kind == OutputKind.GRADIENT_TO_PARAMETER:
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assert isinstance(spec.target, str)
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assert isinstance(spec.arg, TensorArgument)
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gradients_to_parameters[spec.arg.name] = spec.target
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elif spec.kind == OutputKind.GRADIENT_TO_USER_INPUT:
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assert isinstance(spec.target, str)
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assert isinstance(spec.arg, TensorArgument)
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gradients_to_user_inputs[spec.arg.name] = spec.target
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if loss_output is None:
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return None
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return ExportBackwardSignature(
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loss_output=loss_output,
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gradients_to_parameters=gradients_to_parameters,
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gradients_to_user_inputs=gradients_to_user_inputs,
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)
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# Map from assertion dependency token index to assertion dep token output
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# name in output. The shape of output after aot_autograd will be like:
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# (updated_inputs, user_outputs, dep_token).
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@property
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def assertion_dep_token(self) -> Optional[Mapping[int, str]]:
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return None
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@property
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def input_tokens(self) -> Collection[str]:
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input_tokens = []
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for s in self.input_specs:
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if s.kind == InputKind.TOKEN:
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assert isinstance(s.arg, TokenArgument)
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input_tokens.append(s.arg.name)
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return tuple(input_tokens)
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@property
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def output_tokens(self) -> Collection[str]:
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output_tokens = []
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for s in self.output_specs:
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if s.kind == OutputKind.TOKEN:
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assert isinstance(s.arg, TokenArgument)
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output_tokens.append(s.arg.name)
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return tuple(output_tokens)
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def __post_init__(self) -> None:
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assertion_dep_token = self.assertion_dep_token
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if assertion_dep_token is None:
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return
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assert len(assertion_dep_token) == 1
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assertion_dep_token_index = next(iter(assertion_dep_token.keys()))
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assert (
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len(self.user_outputs) + len(self.buffers_to_mutate)
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== assertion_dep_token_index
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)
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def replace_all_uses(self, old: str, new: str):
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"""
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Replace all uses of the old name with new name in the signature.
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"""
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assert isinstance(old, str)
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assert isinstance(new, str)
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arg_types = (
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TensorArgument,
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SymIntArgument,
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SymFloatArgument,
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SymBoolArgument,
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CustomObjArgument,
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TokenArgument,
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)
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for o in self.output_specs:
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if isinstance(o.arg, arg_types):
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if o.arg.name == old:
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o.arg.name = new
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for i in self.input_specs:
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if isinstance(i.arg, arg_types):
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if i.arg.name == old:
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i.arg.name = new
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def get_replace_hook(self, replace_inputs=False):
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def _(old, new, user):
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if user.op == "output":
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self.replace_all_uses(old.name, new)
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if replace_inputs and old.op == "placeholder":
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self.replace_all_uses(old.name, new)
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return _
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def _immutable_dict(items):
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"""
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Creates a mapping where items cannot be added, deleted, or updated.
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NOTE: The immutability is shallow (like tuple is an immutable collection).
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"""
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from types import MappingProxyType
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return MappingProxyType(dict(items))
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def _make_argument_spec(node, token_names) -> ArgumentSpec:
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from torch import ScriptObject, SymBool, SymFloat, SymInt
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from torch._library.fake_class_registry import FakeScriptObject
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if isinstance(node, (int, bool, float, type(None), str)):
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# For const outputs we just directly return this
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return ConstantArgument(name="", value=node)
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assert (
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"val" in node.meta
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), f"{node} is not a constant or a node with a 'val' metadata field"
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val = node.meta["val"]
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if node.name in token_names:
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return TokenArgument(name=node.name)
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elif is_fake(val):
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return TensorArgument(name=node.name)
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elif isinstance(val, SymInt):
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return SymIntArgument(name=node.name)
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elif isinstance(val, SymFloat):
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return SymFloatArgument(name=node.name)
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elif isinstance(val, SymBool):
|
|
return SymBoolArgument(name=node.name)
|
|
elif isinstance(val, ScriptObject):
|
|
return CustomObjArgument(name=node.name, class_fqn=val._type().qualified_name()) # type: ignore[attr-defined]
|
|
elif isinstance(val, FakeScriptObject):
|
|
return CustomObjArgument(
|
|
name=node.name, class_fqn=val.script_class_name, fake_val=val
|
|
)
|
|
elif isinstance(val, (int, bool, str, float, type(None))):
|
|
return ConstantArgument(name=node.name, value=val)
|
|
else:
|
|
raise AssertionError(
|
|
f"Encountered an unsupported object of type {type(val)} "
|
|
f"while writing the metadata for exported program"
|
|
)
|
|
|
|
|
|
def _convert_to_export_graph_signature(
|
|
graph_signature: "GraphSignature",
|
|
gm: "torch.fx.GraphModule",
|
|
non_persistent_buffers: Set[str],
|
|
) -> "ExportGraphSignature":
|
|
from torch.utils import _pytree as pytree
|
|
|
|
is_joint = graph_signature.backward_signature is not None
|
|
|
|
# unpack objects
|
|
user_inputs = set(graph_signature.user_inputs)
|
|
inputs_to_parameters = graph_signature.inputs_to_parameters
|
|
inputs_to_buffers = graph_signature.inputs_to_buffers
|
|
user_outputs = set(graph_signature.user_outputs)
|
|
buffer_mutations = graph_signature.buffers_to_mutate
|
|
user_input_mutations = graph_signature.user_inputs_to_mutate
|
|
grad_params = graph_signature.backward_signature.gradients_to_parameter if is_joint else {} # type: ignore[union-attr]
|
|
grad_user_inputs = graph_signature.backward_signature.gradients_to_user_inputs if is_joint else {} # type: ignore[union-attr]
|
|
loss_output = graph_signature.backward_signature.loss_output if is_joint else None # type: ignore[union-attr]
|
|
input_tokens = graph_signature.input_tokens
|
|
output_tokens = graph_signature.output_tokens
|
|
|
|
inputs = [
|
|
_make_argument_spec(node, input_tokens)
|
|
for node in gm.graph.nodes
|
|
if node.op == "placeholder"
|
|
]
|
|
outputs = [
|
|
_make_argument_spec(node, output_tokens)
|
|
for node in pytree.tree_leaves(next(iter(reversed(gm.graph.nodes))).args)
|
|
]
|
|
|
|
def to_input_spec(inp: ArgumentSpec) -> InputSpec:
|
|
if isinstance(inp, TokenArgument):
|
|
return InputSpec(kind=InputKind.TOKEN, arg=inp, target=None)
|
|
|
|
if not isinstance(inp, TensorArgument):
|
|
return InputSpec(kind=InputKind.USER_INPUT, arg=inp, target=None)
|
|
name = inp.name
|
|
if name in user_inputs:
|
|
return InputSpec(kind=InputKind.USER_INPUT, arg=inp, target=None)
|
|
elif name in inputs_to_parameters:
|
|
return InputSpec(
|
|
kind=InputKind.PARAMETER,
|
|
arg=inp,
|
|
target=inputs_to_parameters[name], # type: ignore[index]
|
|
)
|
|
elif name in inputs_to_buffers:
|
|
return InputSpec(
|
|
kind=InputKind.BUFFER,
|
|
arg=inp,
|
|
target=inputs_to_buffers[name], # type: ignore[index]
|
|
persistent=(inputs_to_buffers[name] not in non_persistent_buffers), # type: ignore[index]
|
|
)
|
|
else:
|
|
raise AssertionError(f"Unknown tensor input kind: {name}")
|
|
|
|
def to_output_spec(idx: int, o: ArgumentSpec) -> OutputSpec:
|
|
if isinstance(o, TokenArgument):
|
|
return OutputSpec(kind=OutputKind.TOKEN, arg=o, target=None)
|
|
|
|
if not isinstance(o, TensorArgument):
|
|
return OutputSpec(kind=OutputKind.USER_OUTPUT, arg=o, target=None)
|
|
name = o.name
|
|
if idx < len(buffer_mutations) + len(user_input_mutations) + len(output_tokens):
|
|
if name in buffer_mutations:
|
|
return OutputSpec(
|
|
kind=OutputKind.BUFFER_MUTATION,
|
|
arg=o,
|
|
target=buffer_mutations[name], # type: ignore[index]
|
|
)
|
|
elif name in user_input_mutations:
|
|
return OutputSpec(
|
|
kind=OutputKind.USER_INPUT_MUTATION,
|
|
arg=o,
|
|
target=user_input_mutations[name], # type: ignore[index]
|
|
)
|
|
else:
|
|
raise AssertionError(f"Unknown tensor mutation kind: {name}")
|
|
else:
|
|
if name in user_outputs:
|
|
return OutputSpec(kind=OutputKind.USER_OUTPUT, arg=o, target=None)
|
|
|
|
elif name in grad_params:
|
|
return OutputSpec(
|
|
kind=OutputKind.GRADIENT_TO_PARAMETER,
|
|
arg=o,
|
|
target=grad_params[name],
|
|
)
|
|
elif name in grad_user_inputs:
|
|
return OutputSpec(
|
|
kind=OutputKind.GRADIENT_TO_USER_INPUT,
|
|
arg=o,
|
|
target=grad_user_inputs[name],
|
|
)
|
|
elif name == loss_output:
|
|
return OutputSpec(kind=OutputKind.LOSS_OUTPUT, arg=o, target=None)
|
|
|
|
else:
|
|
raise AssertionError(f"Unknown tensor output kind: {name}")
|
|
|
|
input_specs = [to_input_spec(inp) for inp in inputs]
|
|
output_specs = [to_output_spec(idx, o) for idx, o in enumerate(outputs)]
|
|
return ExportGraphSignature(input_specs=input_specs, output_specs=output_specs)
|