Add aten._trilinear support to torch_lib core

[WineChord]

Summary

• add an opset 18 torch_lib lowering for aten::_trilinear in core.py
• add OpInfo coverage and keep expand*/sumdim arguments as Python tuples during ONNX tracing tests
• validate _trilinear dimension lists before building the einsum equation

Testing

• env -u LD_LIBRARY_PATH pytest tests/function_libs/torch_lib/ops_test.py -k "_trilinear" -vv
• env -u LD_LIBRARY_PATH pytest tests/function_libs/torch_lib/ops_test.py -k "bilinear and not upsample" -vv

Context: requested from the review on pytorch/pytorch#177223.

[WineChord]

@microsoft-github-policy-service agree

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.87%. Comparing base (4c4f7a0) to head (c5d4cda).

Files with missing lines	Patch %	Lines
onnxscript/function_libs/torch_lib/ops/core.py	75.00%	4 Missing and 4 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2850   +/-   ##
=======================================
  Coverage   71.86%   71.87%           
=======================================
  Files         239      239           
  Lines       29139    29171   +32     
  Branches     2875     2880    +5     
=======================================
+ Hits        20942    20966   +24     
- Misses       7219     7223    +4     
- Partials      978      982    +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[justinchuby]

Thanks! Minor nits

[Copilot]

Pull request overview

Adds a torch_lib lowering for aten::_trilinear (via ONNX Einsum) and wires it into the torch-lib OpInfo-based test harness to exercise the new lowering.

Changes:

• Implement aten::_trilinear lowering in onnxscript/function_libs/torch_lib/ops/core.py by generating an einsum equation from expand*/sumdim.
• Add OpInfo/sample-input coverage for torch.ops.aten._trilinear.default in tests/function_libs/torch_lib/extra_opinfo.py.
• Register the new op test entry in tests/function_libs/torch_lib/ops_test_data.py.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/function_libs/torch_lib/ops_test_data.py	Registers _trilinear in the torch_lib op test list.
tests/function_libs/torch_lib/extra_opinfo.py	Adds OpInfo + sample inputs to drive _trilinear tests.
onnxscript/function_libs/torch_lib/ops/core.py	Implements aten::_trilinear lowering using ONNX Einsum.

[justinchuby]

Can you consider the copilot comments as well?

[Copilot]

Pull request overview

This PR adds TorchLib support for PyTorch’s internal aten::_trilinear op by lowering it to ONNX Einsum, and extends the TorchLib OpInfo test matrix to cover the new op.

Changes:

• Add an opset18 TorchLib lowering for aten::_trilinear in onnxscript/function_libs/torch_lib/ops/core.py.
• Add OpInfo/sample-input coverage for ops.aten._trilinear.default and register it in TorchLib test data.
• Add dimension-list validation helpers for building the Einsum equation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/function_libs/torch_lib/ops_test_data.py	Registers ops.aten._trilinear.default in TorchLib operator test data.
tests/function_libs/torch_lib/extra_opinfo.py	Adds OpInfo + sample inputs for _trilinear to exercise tracing/export and numerical checks.
onnxscript/function_libs/torch_lib/ops/core.py	Implements _trilinear lowering via op.Einsum and adds helpers to build/validate the equation.