Which inherits from `RuntimeError` and contains `error_code`, which in case of CUDA should contain error returned by `cudaGetLastError`
`torch::detail::_new_accelerator_error_object(c10::AcceleratorError&)` follows the pattern of CPython's [`PyErr_SetString`](cb8a72b301/Python/errors.c (L282)), namely
- Convert cstr into Python string with `PyUnicode_FromString`
- Create new exception object using `PyObject_CallOneArg` just like it's done in [`_PyErr_CreateException`](cb8a72b301/Python/errors.c (L32))
- Set `error_code` property using `PyObject_SetAttrString`
- decref all temporary references
Test that it works and captures CPP backtrace (in addition to CI) by running
```python
import os
os.environ['TORCH_SHOW_CPP_STACKTRACES'] = '1'
import torch
x = torch.rand(10, device="cuda")
y = torch.arange(20, device="cuda")
try:
x[y] = 2
print(x)
except torch.AcceleratorError as e:
print("Exception was raised", e.args[0])
print("Captured error code is ", e.error_code)
```
which produces following output
```
Exception was raised CUDA error: device-side assert triggered
CUDA kernel errors might be asynchronously reported at some other API call, so the stacktrace below might be incorrect.
For debugging consider passing CUDA_LAUNCH_BLOCKING=1
Compile with `TORCH_USE_CUDA_DSA` to enable device-side assertions.
Exception raised from c10_cuda_check_implementation at /home/ubuntu/pytorch/c10/cuda/CUDAException.cpp:41 (most recent call first):
C++ CapturedTraceback:
#4 std::_Function_handler<std::shared_ptr<c10::LazyValue<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const> (), c10::SetStackTraceFetcher(std::function<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > ()>)::{lambda()#1}>::_M_invoke(std::_Any_data const&) from Logging.cpp:0
#5 c10::Error::Error(c10::SourceLocation, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) from ??:0
#6 c10::cuda::c10_cuda_check_implementation(int, char const*, char const*, int, bool) [clone .cold] from CUDAException.cpp:0
#7 void at::native::gpu_kernel_impl<at::native::AbsFunctor<float> >(at::TensorIteratorBase&, at::native::AbsFunctor<float> const&) [clone .isra.0] from tmpxft_000191fc_00000000-6_AbsKernel.cudafe1.cpp:0
#8 at::native::abs_kernel_cuda(at::TensorIteratorBase&) from ??:0
#9 at::Tensor& at::native::unary_op_impl_with_complex_to_float_out<at::native::abs_stub_DECLARE_DISPATCH_type>(at::Tensor&, at::Tensor const&, at::native::abs_stub_DECLARE_DISPATCH_type&, bool) [clone .constprop.0] from UnaryOps.cpp:0
#10 at::(anonymous namespace)::(anonymous namespace)::wrapper_CUDA_out_abs_out(at::Tensor const&, at::Tensor&) from RegisterCUDA_0.cpp:0
#11 at::_ops::abs_out::call(at::Tensor const&, at::Tensor&) from ??:0
#12 at::native::abs(at::Tensor const&) from ??:0
#13 c10::impl::wrap_kernel_functor_unboxed_<c10::impl::detail::WrapFunctionIntoFunctor_<c10::CompileTimeFunctionPointer<at::Tensor (at::Tensor const&), &at::(anonymous namespace)::(anonymous namespace)::wrapper_CompositeExplicitAutograd__abs>, at::Tensor, c10::guts::typelist::typelist<at::Tensor const&> >, at::Tensor (at::Tensor const&)>::call(c10::OperatorKernel*, c10::DispatchKeySet, at::Tensor const&) from RegisterCompositeExplicitAutograd_0.cpp:0
#14 at::_ops::abs::redispatch(c10::DispatchKeySet, at::Tensor const&) from ??:0
#15 torch::autograd::VariableType::(anonymous namespace)::abs(c10::DispatchKeySet, at::Tensor const&) from VariableType_1.cpp:0
#16 c10::impl::wrap_kernel_functor_unboxed_<c10::impl::detail::WrapFunctionIntoFunctor_<c10::CompileTimeFunctionPointer<at::Tensor (c10::DispatchKeySet, at::Tensor const&), &torch::autograd::VariableType::(anonymous namespace)::abs>, at::Tensor, c10::guts::typelist::typelist<c10::DispatchKeySet, at::Tensor const&> >, at::Tensor (c10::DispatchKeySet, at::Tensor const&)>::call(c10::OperatorKernel*, c10::DispatchKeySet, at::Tensor const&) from VariableType_1.cpp:0
#17 at::_ops::abs::call(at::Tensor const&) from ??:0
#18 at::native::isfinite(at::Tensor const&) from ??:0
#19 c10::impl::wrap_kernel_functor_unboxed_<c10::impl::detail::WrapFunctionIntoFunctor_<c10::CompileTimeFunctionPointer<at::Tensor (at::Tensor const&), &at::(anonymous namespace)::(anonymous namespace)::wrapper_CompositeImplicitAutograd__isfinite>, at::Tensor, c10::guts::typelist::typelist<at::Tensor const&> >, at::Tensor (at::Tensor const&)>::call(c10::OperatorKernel*, c10::DispatchKeySet, at::Tensor const&) from RegisterCompositeImplicitAutograd_0.cpp:0
#20 at::_ops::isfinite::call(at::Tensor const&) from ??:0
#21 torch::autograd::THPVariable_isfinite(_object*, _object*, _object*) from python_torch_functions_2.cpp:0
#22 PyObject_CallFunctionObjArgs from ??:0
#23 _PyObject_MakeTpCall from ??:0
#24 _PyEval_EvalFrameDefault from ??:0
#25 _PyObject_FastCallDictTstate from ??:0
#26 _PyStack_AsDict from ??:0
#27 _PyObject_MakeTpCall from ??:0
#28 _PyEval_EvalFrameDefault from ??:0
#29 _PyFunction_Vectorcall from ??:0
#30 _PyEval_EvalFrameDefault from ??:0
#31 _PyFunction_Vectorcall from ??:0
#32 _PyEval_EvalFrameDefault from ??:0
#33 _PyFunction_Vectorcall from ??:0
#34 _PyEval_EvalFrameDefault from ??:0
#35 PyFrame_GetCode from ??:0
#36 PyNumber_Xor from ??:0
#37 PyObject_Str from ??:0
#38 PyFile_WriteObject from ??:0
#39 _PyWideStringList_AsList from ??:0
#40 _PyDict_NewPresized from ??:0
#41 _PyEval_EvalFrameDefault from ??:0
#42 PyEval_EvalCode from ??:0
#43 PyEval_EvalCode from ??:0
#44 PyUnicode_Tailmatch from ??:0
#45 PyInit__collections from ??:0
#46 PyUnicode_Tailmatch from ??:0
#47 _PyRun_SimpleFileObject from ??:0
#48 _PyRun_AnyFileObject from ??:0
#49 Py_RunMain from ??:0
#50 Py_BytesMain from ??:0
#51 __libc_init_first from ??:0
#52 __libc_start_main from ??:0
#53 _start from ??:0
Captured error code is 710
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/152023
Approved by: https://github.com/eqy, https://github.com/mradmila, https://github.com/ngimel
ghstack dependencies: #154436
This adds a non-blocking mode to queue_pop. This allows for workers to poll if work is ready without blocking the main loop. This is useful for the case where you want to have a GPU have maximum utilization when something only periodically is sent on the queue.
We also expose a `torch.distributed.QueueEmptyError` so users can catch the error and handle it accordingly.
Test plan:
```
pytest test/distributed/test_store.py -k queue -v -s -x
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/151485
Approved by: https://github.com/fduwjj, https://github.com/tianfengfrank
Fixes#121200
This PR introduces AcceleratorOutOfMemoryError for all privateuse1 backend. For python, there is a PyError object which will be set only when privateuse1 is registered. All privateuse1 backend then can use this error for memory errors. Maybe more error types in the future.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121702
Approved by: https://github.com/guangyey, https://github.com/albanD
We have a plethora of error types for various errors raised from c10d. These include `RuntimeError`, `TimeoutError`, `SocketError`, `DistBackendError` etc.
This results in messy code during error handling somewhat like this:
```
if "NCCL" in exception_str:
...
if "Timed out initializing process group in store based barrier on rank" in exception_str:
...
if "The client socket has timed out after" in exception_str:
...
if "Broken pipe" in exception_str:
...
if "Connection reset by peer" in exception_str:
...
```
To address this issue, in this PR I've ensured added these error types:
1. **DistError** - the base type of all distributed errors
2. **DistBackendError** - this already existed and referred to PG backend errors
3. **DistStoreError** - for errors originating from the store
4. **DistNetworkError** - for general network errors coming from the socket library
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108191
Approved by: https://github.com/H-Huang
We have a plethora of error types for various errors raised from c10d. These include `RuntimeError`, `TimeoutError`, `SocketError`, `DistBackendError` etc.
This results in messy code during error handling somewhat like this:
```
if "NCCL" in exception_str:
...
if "Timed out initializing process group in store based barrier on rank" in exception_str:
...
if "The client socket has timed out after" in exception_str:
...
if "Broken pipe" in exception_str:
...
if "Connection reset by peer" in exception_str:
...
```
To address this issue, in this PR I've ensured added these error types:
1. **DistError** - the base type of all distributed errors
2. **DistBackendError** - this already existed and referred to PG backend errors
3. **DistStoreError** - for errors originating from the store
4. **DistNetworkError** - for general network errors coming from the socket library
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107651
Approved by: https://github.com/H-Huang
Without these changes, it can be hard to know which magic methods are not implemented on a given ScriptObject.
before:
```py
torch.ops.load_library("somelib.so")
c = torch.classes.somelib.SomeClass()
print(len(c))
# raise NotImplementedError
```
after:
```py
torch.ops.load_library("somelib.so")
c = torch.classes.somelib.SomeClass()
print(len(c))
# raise NotImplementedError: '__len__' is not implemented for __torch__.torch.classes.somelib.SomeClass
```
------
I could not find a linked issue, if you want me to open one as well I can do this.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100171
Approved by: https://github.com/ezyang
Not only is this change usually shorter and more readable, it also can yield better performance. size() is not always a constant time operation (such as on LinkedLists), but empty() always is.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/93236
Approved by: https://github.com/malfet
Currently all of the distributed errors are thrown from the `TORCH_CHECK` macro which throws a generic `RuntimeError`. This change introduced a new error type `DistBackendError` which derives from `RuntimeError` to signify there was an error with the backend communication library. This allows for better error handling and analysis at higher levels in the stack. Motivation: https://docs.google.com/document/d/1j6VPOkC6znscliFuiDWMuMV1_fH4Abgdq7TCHMcXai4/edit#heading=h.a9rc38misyx8
Changes:
- introduce new error type
- Update `C10D_NCCL_CHECK`
Sample script to demonstrate new error type
```python
# python -m torch.distributed.run --nproc_per_node=2 <script>.py
import torch
import torch.distributed as dist
if __name__ == "__main__":
dist.init_process_group("nccl")
dist.broadcast(torch.tensor([1, 2, 3]).cuda(), 0)
```
Differential Revision: [D40998803](https://our.internmc.facebook.com/intern/diff/D40998803)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/88134
Approved by: https://github.com/rohan-varma
This is a new version of #15648 based on the latest master branch.
Unlike the previous PR where I fixed a lot of the doctests in addition to integrating xdoctest, I'm going to reduce the scope here. I'm simply going to integrate xdoctest, and then I'm going to mark all of the failing tests as "SKIP". This will let xdoctest run on the dashboards, provide some value, and still let the dashboards pass. I'll leave fixing the doctests themselves to another PR.
In my initial commit, I do the bare minimum to get something running with failing dashboards. The few tests that I marked as skip are causing segfaults. Running xdoctest results in 293 failed, 201 passed tests. The next commits will be to disable those tests. (unfortunately I don't have a tool that will insert the `#xdoctest: +SKIP` directive over every failing test, so I'm going to do this mostly manually.)
Fixes https://github.com/pytorch/pytorch/issues/71105
@ezyang
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82797
Approved by: https://github.com/ezyang
Closes#76952
This does `processErrorMsg` inplace on the warning string, so that in
the fast-path of no type translation it doesn't need to allocate a new
string just to copy the contents over. I also replaced `ostringstream`
with `fmt::format_to` which has noticably better performance.
Overall in a benchmark of `torch.floor_divide`, this drops the
callgrind instruction count from 703,168 to 571,774 and the bechmark
improves by 300 ns from 2.26 us to 1.94 us.
This brings the callgrind count for `~PyWarningHandler` up to ~80%
from `PyErr_WarnEx` so this is probably about as fast as our warning
handling can reasonably get.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76977
Approved by: https://github.com/swolchok
`processErrorMsg` uses a table of string constants to be replaced in
the error message. However, this table is non-static so gets
re-constructed from scratch every time. So, I've made it `constexpr`
by using `std::array` instead of `std::vector` and `c10::string_view`
instead of `std::string`.
To support `c10::string_view` I've also updated `c10::ReplaceAll` to
accept string_view arguments, and added a fast-path that also avoids
repeated string searches when no translation is needed.
Using `torch.floor_divide` to benchmark a python warning, I see the
callgrind instruction count fall from 3,806,446 to 703,168 and a 6.5
us time improvement using `%timeit`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76976
Approved by: https://github.com/swolchok
Summary:
This PR fixes https://github.com/pytorch/pytorch/issues/64785 by introducing a `torch.LinAlgError` for reporting errors caused by bad values in linear algebra routines which should allow users to easily catch errors caused by numerical errors.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68571
Reviewed By: malfet
Differential Revision: D33254087
Pulled By: albanD
fbshipit-source-id: 94b59000fdb6a9765e397158e526d1f815f18f0f
Summary:
I've noticed that the `HANDLE_TH_ERRORS` macros are actually very expensive in terms of compile time. Moving the bulk of the catch statements out of line using a lippincott function significantly improves compile times and object file binary sizes. For just the generated autograd bindings, this halves serial build time from 8 minutes to 4 and binary size is more than halved for most files with the biggest difference being `python_variable_methods.cpp` which went from 126 MB to 43 MB.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69974
Reviewed By: mruberry
Differential Revision: D33160899
Pulled By: albanD
fbshipit-source-id: fc35fa86f69ffe5a0752557be30b438c8564e998
Summary:
Fixes https://github.com/pytorch/pytorch/issues/50209
This adds a new warning handler that stores all warnings in a shared
queue, which can be "replayed" at a later time and, crucially, on
another thread. Then, I use this inside the autograd engine to ensure
that warnings are processed by the handler registered on the main
thread.
For testing, I also add an operator that always warns in the backward
pass and test that the warning is a normal Python warning.
cc ezyang albanD zou3519 gqchen pearu nikitaved soulitzer Lezcano Varal7
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66235
Reviewed By: ejguan
Differential Revision: D31505413
Pulled By: albanD
fbshipit-source-id: 1a7f60b038f55c20591c0748b9e86735b3fec2f9
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65376
Let's suppose there's a bug in PyTorch and python_error gets thrown
and never gets caught. Typically, you'll get a very useless error
message like this:
```
terminate called after throwing an instance of 'python_error'
what():
Aborted (core dumped)
```
Now, you'll get:
```
what(): unknown Python error (for more information, try rerunning with TORCH_SHOW_CPP_STACKTRACES=1)
```
and with TORCH_SHOW_CPP_STACKTRACES=1 you'll get:
```
what(): error message from Python object
```
If we're OK with making Python exceptions go even slower, we could
eagerly populate unconditionally. I'm also not so happy we don't get
a Python backtrace or the Python error name, that's worth improving
(this is a minimal diff to get the discussion going.)
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: albanD
Differential Revision: D31067632
Pulled By: ezyang
fbshipit-source-id: 9cfda47cafb349ee3d6853cdfb0f319073b87bff
Summary:
As GoogleTest `TEST` macro is non-compliant with it as well as `DEFINE_DISPATCH`
All changes but the ones to `.clang-tidy` are generated using following script:
```
for i in `find . -type f -iname "*.c*" -or -iname "*.h"|xargs grep cppcoreguidelines-avoid-non-const-global-variables|cut -f1 -d:|sort|uniq`; do sed -i "/\/\/ NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)/d" $i; done
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62008
Reviewed By: driazati, r-barnes
Differential Revision: D29838584
Pulled By: malfet
fbshipit-source-id: 1b2f8602c945bd4ce50a9bfdd204755556e31d13
Summary:
This is an automatic change generated by the following script:
```
#!/usr/bin/env python3
from subprocess import check_output, check_call
import os
def get_compiled_files_list():
import json
with open("build/compile_commands.json") as f:
data = json.load(f)
files = [os.path.relpath(node['file']) for node in data]
for idx, fname in enumerate(files):
if fname.startswith('build/') and fname.endswith('.DEFAULT.cpp'):
files[idx] = fname[len('build/'):-len('.DEFAULT.cpp')]
return files
def run_clang_tidy(fname):
check_call(["python3", "tools/clang_tidy.py", "-c", "build", "-x", fname,"-s"])
changes = check_output(["git", "ls-files", "-m"])
if len(changes) == 0:
return
check_call(["git", "commit","--all", "-m", f"NOLINT stubs for {fname}"])
def main():
git_files = check_output(["git", "ls-files"]).decode("ascii").split("\n")
compiled_files = get_compiled_files_list()
for idx, fname in enumerate(git_files):
if fname not in compiled_files:
continue
if fname.startswith("caffe2/contrib/aten/"):
continue
print(f"[{idx}/{len(git_files)}] Processing {fname}")
run_clang_tidy(fname)
if __name__ == "__main__":
main()
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56892
Reviewed By: H-Huang
Differential Revision: D27991944
Pulled By: malfet
fbshipit-source-id: 5415e1eb2c1b34319a4f03024bfaa087007d7179
Summary:
When we return to Python from C++ in PyTorch and have warnings and and error, we have the problem of what to do when the warnings throw because we can only throw one error.
Previously, if we had an error, we punted all warnings to the C++ warning handler which would write them to stderr (i.e. system fid 2) or pass them on to glog.
This has drawbacks if an error happened:
- Warnings are not handled through Python even if they don't raise,
- warnings are always printed with no way to suppress this,
- the printing bypasses sys.stderr, so Python modules wanting to
modify this don't work (with the prominent example being Jupyter).
This patch does the following instead:
- Set the warning using standard Python extension mechanisms,
- if Python decides that this warning is an error and we have a
PyTorch error, we print the warning through Python and clear
the error state (from the warning).
This resolves the three drawbacks discussed above, in particular it fixes https://github.com/pytorch/pytorch/issues/37240 .
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41116
Differential Revision: D22456393
Pulled By: albanD
fbshipit-source-id: c3376735723b092efe67319321a8a993402985c7
Summary:
Today in PyTorch, warnings triggered in C++ are printed to Python users like this:
`../aten/src/ATen/native/BinaryOps.cpp:81: UserWarning: Integer division of tensors using div or / is deprecated, and in a future release div will perform true division as in Python 3. Use true_divide or floor_divide (// in Python) instead.`
This may be unhelpful to Python users, who have complained it's difficult to relate these messages back to their programs. After this PR, warnings that go through the PyWarningHandler and allow it to add context print like this:
```
test/test_torch.py:16463: UserWarning: Integer division of tensors using div or / is deprecated, and in a future release div will perform true division as in Python 3. Use true_divide or floor_divide (// in Python) instead. (Triggered internally at ../aten/src/ATen/native/BinaryOps.cpp:81.)
cpu_result = getattr(cpu_tensor, op_str)(*cpu_args)
```
This relates the warning back to the user's program. The information about the cpp file and line number is preserved in the body of the warning message.
Some warnings, like those generated in the JIT, already account for a user's Python context, and so they specify that they should be printed verbatim and are unaffected by this change. Warnings originating in Python and warnings that go through c10's warning handler, which prints to cerr, are also unaffected.
A test is added to test_torch.py for this behavior. The test relies on uint8 indexing being deprecated and its warning originating from its current header file, which is an unfortunate dependency. We could implement a `torch.warn` function, instead.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36052
Differential Revision: D20887740
Pulled By: mruberry
fbshipit-source-id: d3515c6658a387acb7fccaf83f23dbb452f02847
Summary:
Closes https://github.com/pytorch/pytorch/issues/30027
The idea here is that you can bind a function with `pybind11` in a single line and without modifying the function:
```cpp
m.def("foo", foo, py::call_guard<torch::PyWarningHandler>());
```
Where warnings are handled by the [`call_guard`](https://pybind11.readthedocs.io/en/stable/advanced/functions.html#call-guard) and exceptions are handled by the `pybind11` exception translator. To do this, I have added support for handling C++ exceptions in `torch::PyWarningHandler`'s destructor without setting the python error state before hand.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30588
Differential Revision: D19905626
Pulled By: albanD
fbshipit-source-id: 90c0a5e298b123cc0c8ab9c52c91be4e96ea47c6
