[Relax] Add FRelaxInferLayout for flip operator

[guan404ming]

Why

The flip operator lacked layout inference support, preventing it from participating in layout transformations during the ConvertLayout pass.

How

• Add InferLayoutFlip function that transforms the axis attribute according to the input layout
• Register FRelaxInferLayout attribute for relax.flip operator
• Add test case for conv2d followed by flip with layout conversion

[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 integrates the relax.flip operator into Relax's layout transformation system by providing a dedicated layout inference function. This enhancement allows the system to automatically adjust the flip operation's axis when tensor data layouts are converted, which is crucial for maintaining correctness and enabling performance optimizations across various hardware backends.

Highlights

• FRelaxInferLayout for relax.flip: Implemented the FRelaxInferLayout attribute for the relax.flip operator, enabling it to participate in layout transformation passes within the Relax framework.
• Axis Transformation Logic: Added robust logic within InferLayoutFlip to correctly transform the axis attribute of the flip operation based on the input tensor's layout changes, ensuring functional correctness across different data layouts.
• New Test Case for Layout Conversion: Introduced test_conv2d_flip to thoroughly validate the relax.flip operator's behavior when combined with layout transformations, specifically demonstrating its interaction with conv2d and permute_dims.

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[gemini-code-assist]

Code Review

This pull request adds layout inference support for the relax.flip operator, which is a great addition. The implementation in InferLayoutFlip is correct, and the new test case test_conv2d_flip effectively validates the changes. My main feedback is to simplify the logic for finding the transformed axis by using the existing FindAxis utility function, which will improve code readability and maintainability.

[guan404ming]

cc @tlopex @mshr-h

[guan404ming]

Thanks!