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[torchlib] Inefficient implementations

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good first issueGood for newcomersGood for newcomers

module: torchlibRelated to the torch/aten function lib in developmentRelated to the torch/aten function lib in development

Status: Open.

#2489 In microsoft/onnxscript;

· justinchuby opened on Aug 14, 2025

Improve Reshape and Slice folding

module: rewriter

Status: Open (in progress).

microsoft/onnxscriptnumber 2807

#2807 In microsoft/onnxscript;

· justinchuby opened on Feb 13, 2026

Fix constant folding dropping subgraph initializers when inlining If branches

module: optimizer

Status: Open (in progress).

microsoft/onnxscriptnumber 2825

#2825 In microsoft/onnxscript;

· Copilot opened on Feb 25, 2026

Fix scatter_reduce(reduce="mean") producing incorrect ONNX export results

Status: Open (in progress).

microsoft/onnxscriptnumber 2829

#2829 In microsoft/onnxscript;

· Copilot opened on Feb 25, 2026

Fix SplitToSequence with scalar uneven split producing incorrect equal-split output

Status: Open (in progress).

microsoft/onnxscriptnumber 2858

#2858 In microsoft/onnxscript;

· Copilot opened on Mar 18, 2026

Fix hang in constant folding when Resize output exceeds size limit

Status: Draft (not ready).

microsoft/onnxscriptnumber 2860

#2860 In microsoft/onnxscript;

· Copilot opened on Mar 19, 2026

[torchlib] add aten::bincount ONNX lowering and bool-mask aten::index_put fix with e2e coverage

Status: Open (in progress).

microsoft/onnxscriptnumber 2921

#2921 In microsoft/onnxscript;

· Copilot opened on May 20, 2026

[torchlib] Reimplement as_strided without an ONNX loop

module: torchlibRelated to the torch/aten function lib in developmentRelated to the torch/aten function lib in development

Status: Open (in progress).

microsoft/onnxscriptnumber 2928

#2928 In microsoft/onnxscript;

· Copilot opened on Jun 3, 2026

Fix ReshapeReshape initializer name collisions when resolving shared -1 shapes

Status: Open (in progress).

microsoft/onnxscriptnumber 2947

#2947 In microsoft/onnxscript;

· Copilot opened on Jun 22, 2026