[Relax] Add edge padding mode

[guan404ming]

Why

resolve todo in python/tvm/relax/frontend/common.py

How

• add edge padding mode
• add auto pad test

[gemini-code-assist]

Summary of Changes

Hello @guan404ming, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the autopad function in the Relax frontend by introducing support for the 'edge' padding mode. This resolves a known limitation and expands the functionality for handling tensor padding operations. The changes also include the addition of new test cases to validate the behavior of all supported padding modes, ensuring the reliability of the updated functionality.

Highlights

• Edge Padding Mode Implementation: The 'edge' padding mode has been fully implemented within the autopad utility function, resolving a previously existing TODO and NotImplementedError.
• Comprehensive Test Coverage: New tests have been added for the autopad function, specifically covering the 'constant', 'edge', and 'reflect' padding modes to ensure correctness and robustness.

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[gemini-code-assist]

Code Review

This pull request correctly implements the 'edge' padding mode for the autopad utility, resolving a TODO in the process. The implementation correctly uses topi.nn.replicate_pad. Furthermore, you've added a comprehensive new test class for autopad that covers not only the new 'edge' mode but also existing 'constant' and 'reflect' modes. This significantly improves test coverage and confidence in this utility. The code is clean, correct, and well-tested. Great work!

[guan404ming]

cc @tlopex @mshr-h

[cbalint13]

LGTM,

Thanks @guan404ming !

[guan404ming]

Thanks!