[RELAX][LAYOUT] Support for dynamic layout specification

[srkreddy1238]

This allows user defined callback to specify layouts dynamically based on call description.
Helpful to alter layouts based on the operator shapes or attributes.

[gemini-code-assist]

Summary of Changes

Hello @srkreddy1238, 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 significantly enhances the ConvertLayout pass within TVM Relax by introducing a mechanism for dynamic layout specification. Instead of relying solely on a predefined map of desired layouts, users can now provide a callback function (layout_cb) that dynamically determines the appropriate layouts for operators based on their call descriptions. This provides greater flexibility, allowing layouts to be adapted on-the-fly according to operator shapes or attributes, which is crucial for optimizing performance in various scenarios.

Highlights

• Dynamic Layout Specification: Introduced a new LayoutCb type (a ffi::TypedFunction) to allow users to specify layouts dynamically based on call descriptions.
• Enhanced ConvertLayout Pass: The ConvertLayout pass now accepts an optional layout_cb parameter, enabling dynamic layout determination at runtime.
• Layout Precedence: If a layout_cb is provided, it will be invoked to determine layouts, overriding any statically defined desired_layouts.
• Test Coverage: A new test case, test_layout_cb, has been added to demonstrate and verify the functionality of the dynamic layout callback.

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[gemini-code-assist]

Code Review

This pull request introduces support for dynamic layout specification through a user-defined callback. The changes look good and are well-tested. I've found a minor typo in a docstring and a small opportunity for code simplification to improve readability and avoid redundant function calls. Overall, this is a solid contribution.

[guan404ming]

LGTM, thanks!

[tlopex]

LGTM