ONNX Runtime: cross-platform, high performance ML inferencing and training accelerator
Find a file
Ivan Komarov 16b39e5b87
symbolic_shape_infer.py: Fix slicing a tensor that has a sympy.Min() in its shape (#14384)
### Description

`_infer_Slice()` is a function (arguably the most complex one) in
`symbolic_shape_infer.py` that infers the shape of the output of a
`Slice` node. This commit fixes an edge case in `_infer_Slice()` caused
by a SymPy quirk.

When both the end of the slice (let's call it `e`) and the corresponding
dimension of the sliced tensor (let's call it `dim`) are arbitrary
symbolic expressions, `symbolic_shape_infer.py`
[checks](de7a868d5f/onnxruntime/python/tools/symbolic_shape_infer.py (L1728))
if `e <= dim`. Comparing symbolic expressions is hard in general, so if
the comparison fails, `symbolic_shape_infer.py` [gives
up](de7a868d5f/onnxruntime/python/tools/symbolic_shape_infer.py (L1734))
and assumes that `e` is equal to `dim`.

A failure of this sort currently happens for expressions of the form `Y
- X >= 0` where `Y` contains a `sympy.Min()` (`symbolic_shape_infer.py`
tries to rewrite `X <= Y` comparisons in various ways, and `Y - X >= 0`
is [one of
them](de7a868d5f/onnxruntime/python/tools/symbolic_shape_infer.py (L1664))).
An simple example to illustrate this:
```python
>>> import sympy
>>> X = sympy.Symbol('X', positive=True, integer=True)
>>> 
>>> y1 = 9999
>>> Y1 = X + y1 - 5000
>>> bool(Y1 - X >= 0)
True
>>> 
>>> y2 = X + 4999
>>> Y2 = X + y2 - 5000
>>> bool(Y2 - X >= 0)
True
>>> 
>>> y3 = sympy.Min(y1, y2)
>>> Y3 = X + y3 - 5000
>>> bool(Y3 - X >= 0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File ".../venv/lib/python3.9/site-packages/sympy/core/relational.py", line 511, in __bool__
    raise TypeError("cannot determine truth value of Relational")
TypeError: cannot determine truth value of Relational
```

If you assume that `X` is positive symbol (`symbolic_shape` [does
assume](de7a868d5f/onnxruntime/python/tools/symbolic_shape_infer.py (L2129))
this for graph inputs), then both `Y1 >= X` and `Y2 >= X` holds, and
SymPy can prove this. This means that `Y3 >= X` also holds (since `Y3`
is essentially equal to either `Y1` or `Y2`, depending on the value of
`X`), but this is too hard for SymPy to prove. I confirmed that this is
still the case for the latest SymPy version (`1.11.1`).

This commit tries to fix this edge case by slightly rewriting the
expression containing `sympy.Min()`. I explain the details in the
comments in `symbolic_shape_infer.py`, so I won't duplicate them in the
PR description.

### Motivation and Context
This sounds like a very contrived example, but it actually appeared in
the wild when we tried to infer shapes for an ONNX graph exported from
PyTorch that used relative-position multihead attention from Fairseq.
The problematic line is
[here](7d050ada7d/fairseq/modules/espnet_multihead_attention.py (L192)).
In our codebase, we have something like `matrix_bd = matrix_bd[:, :, :,
: matrix_ac.size(-1)]` before we add `matrix_ac` and `matrix_bd`.
`matrix_bd` is itself a result of another slice, hence its shape
contains `sympy.Min()`, and the SymPy weirdness described above prevents
`symbolic_shape_infer.py` from correctly inferring the final shape of
`matrix_bd`. Then `symbolic_shape_infer.py` explodes when we try to add
`matrix_ac` and `matrix_bd`, because their shapes are not compatible.

I added a small self-contained unit test to illustrate the problem.
*Without* the fix, `slice_out_cropped` has shape `[N + Min(42, N + 21) -
22]`, and `input` has shape `[N]`, and we get this:
```
> python onnxruntime_test_python_symbolic_shape_infer.py
..................Cannot determine if 22 - N < 0
Unable to determine if N <= N + Min(42, N + 21) - 22, treat as equal
E....
======================================================================
ERROR: test_slice_of_min (__main__.TestSymbolicShapeInferenceForSlice)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/dfyz/onnxruntime/onnxruntime/test/python/onnxruntime_test_python_symbolic_shape_infer.py", line 460, in test_slice_of_min
    model = SymbolicShapeInference.infer_shapes(onnx.helper.make_model(graph_def))
  File "/home/dfyz/onnxruntime/onnxruntime/test/python/../../python/tools/symbolic_shape_infer.py", line 2461, in infer_shapes
    raise Exception("Incomplete symbolic shape inference")
Exception: Incomplete symbolic shape inference

----------------------------------------------------------------------
Ran 23 tests in 0.486s

FAILED (errors=1)
```

*With* the fix, both tensors have shape `[N]`, and the test passes.

---------

Co-authored-by: Ivan Komarov <dfyz@yandex-team.ru>
2023-02-23 15:32:37 +01:00
.config Update tsaoptions.json: update the email alias (#13448) 2022-10-26 15:56:16 -07:00
.devcontainer Remove two lines in the Dockerfile for Github Codespace (#12278) 2022-07-21 20:52:17 -07:00
.gdn Update compliance tasks in python packaging pipeline and fix some compile warnings (#8471) 2021-07-30 17:16:37 -07:00
.github Upgrade doxygen to fix C API docs build issue (#13950) 2023-02-03 09:43:29 -08:00
.pipelines use python 3.9.7 in windowai packaging pipeline (#14766) 2023-02-23 09:48:42 +08:00
.vscode cpplint & Eager mode: refactor and add comments to empty_* functions, general lint cleanup in ort_aten (#12238) 2022-07-20 11:47:57 -04:00
cgmanifests Revert mimalloc from v2.0.9 to v2.0.3 (#14603) 2023-02-07 09:58:25 -08:00
cmake Migrating ORT Extensions from Git submodule to cmake FetchContent (#14298) 2023-02-22 19:42:36 -08:00
csharp restore opset18 test (#14677) 2023-02-20 18:19:10 +08:00
dockerfiles [Build] Fix arm64 Docker build (#14283) 2023-01-30 16:25:19 -08:00
docs support NeoX-style rotary embedding (#14785) 2023-02-22 18:21:34 -08:00
include/onnxruntime/core Enable Opset11 Sequence Ops on DirectML, and make the CPU implementations agnostic to backend EP (#14442) 2023-02-21 18:08:28 -08:00
java Update java/build.gradle to not use deprecated features that were removed in gradle 8.0. (#14733) 2023-02-20 11:19:49 +08:00
js Bump jszip from 3.7.1 to 3.8.0 in /js/web (#14536) 2023-02-07 01:38:00 +00:00
objectivec [objc] Fix parameter name in documentation. (#14330) 2023-01-18 16:54:59 -08:00
onnxruntime symbolic_shape_infer.py: Fix slicing a tensor that has a sympy.Min() in its shape (#14384) 2023-02-23 15:32:37 +01:00
orttraining Enable Opset11 Sequence Ops on DirectML, and make the CPU implementations agnostic to backend EP (#14442) 2023-02-21 18:08:28 -08:00
package/rpm Bump ORT version number (#14226) 2023-01-26 12:33:47 -08:00
rust Add rust bindings (#12606) 2023-02-08 14:57:15 -08:00
samples Format all python files under onnxruntime with black and isort (#11324) 2022-04-26 09:35:16 -07:00
tools Migrating ORT Extensions from Git submodule to cmake FetchContent (#14298) 2023-02-22 19:42:36 -08:00
winml remove device_id parameter out of ExecutionProvider::GetAllocator() (#14580) 2023-02-13 10:01:07 -08:00
.clang-format
.clang-tidy Create clang-tidy CI (#12653) 2022-09-30 08:05:38 -07:00
.dockerignore
.flake8 Remove miscellaneous nuphar configs (#13070) 2022-09-26 13:41:28 -07:00
.gitattributes
.gitignore Add rust bindings (#12606) 2023-02-08 14:57:15 -08:00
.gitmodules Remove unused git submodules (#13830) 2022-12-07 21:59:16 -08:00
build.amd64.1411.bat
build.bat
build.sh
CITATION.cff Fix CITATION.cff and add automatic validation of your citation metadata (#10478) 2022-04-13 10:03:52 -07:00
CODEOWNERS Add cgmanifest file in codeowner list (#13042) 2022-09-22 18:58:01 -07:00
CONTRIBUTING.md Add instructions for previewing docs changes (#12528) 2023-02-09 16:25:46 -08:00
lgtm.yml Fix lgtm C++ error (#13613) 2022-11-10 10:06:22 -08:00
LICENSE Remove year from license (#6658) 2021-02-12 00:25:56 -08:00
NuGet.config
ort.wprp
ORT_icon_for_light_bg.png Update nuget icon (#10672) 2022-03-01 09:11:03 -08:00
packages.config [DML EP] Upgrade DML to 1.10.1 (#14433) 2023-01-25 21:07:10 -08:00
pyproject.toml Update pylint config to include valid short names (#13631) 2022-11-14 10:00:25 -08:00
README.md [Readme] Update table for build pipelines (#14618) 2023-02-08 09:44:20 -08:00
requirements-dev.txt Introduce parameterized as a dev dependency (#11364) 2022-04-26 17:24:39 -07:00
requirements-doc.txt Add auto doc gen for ORTModule API during CI build (#7046) 2021-03-22 10:20:33 -07:00
requirements-training.txt Remove protobuf pin from training requirements (#13695) 2022-11-22 12:27:18 -08:00
requirements.txt.in Add additional python requirements (#11522) 2022-05-20 16:16:18 -07:00
SECURITY.md Microsoft mandatory file (#11619) 2022-05-25 13:56:10 -07:00
setup.py Stable Diffusion CUDA optimizations Part 2 (#14597) 2023-02-07 07:49:15 -08:00
ThirdPartyNotices.txt Revert mimalloc from v2.0.9 to v2.0.3 (#14603) 2023-02-07 09:58:25 -08:00
VERSION_NUMBER Bump ORT version number (#14226) 2023-01-26 12:33:47 -08:00

ONNX Runtime is a cross-platform inference and training machine-learning accelerator.

ONNX Runtime inference can enable faster customer experiences and lower costs, supporting models from deep learning frameworks such as PyTorch and TensorFlow/Keras as well as classical machine learning libraries such as scikit-learn, LightGBM, XGBoost, etc. ONNX Runtime is compatible with different hardware, drivers, and operating systems, and provides optimal performance by leveraging hardware accelerators where applicable alongside graph optimizations and transforms. Learn more →

ONNX Runtime training can accelerate the model training time on multi-node NVIDIA GPUs for transformer models with a one-line addition for existing PyTorch training scripts. Learn more →

Get Started & Resources

Build Pipeline Status

System Inference Training
Windows Build Status
Build Status
Build Status
Linux Build Status
Build Status
Build Status
Build Status
Build Status
Build Status
Build Status
Build Status
Mac Build Status
Android Build Status
iOS Build Status
Web Build Status
Other Build Status
Build Status

Data/Telemetry

Windows distributions of this project may collect usage data and send it to Microsoft to help improve our products and services. See the privacy statement for more details.

Contributions and Feedback

We welcome contributions! Please see the contribution guidelines.

For feature requests or bug reports, please file a GitHub Issue.

For general discussion or questions, please use GitHub Discussions.

Code of Conduct

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

License

This project is licensed under the MIT License.