Set default value of causal, return_lse and with-attn-* to false

[dhernandez0]

Motivation

To avoid really long tuning time, we can set the default value of these params to false. I think if migraphx didn't provide those, it's a safe assumption that they are false.

Please, review MITuna PR as well: ROCm/MITuna#1015

Technical Details

Just set the value to false if they are not in the problem config.

Test Plan

All tests pass.

Test Result

All tests pass.

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull request overview

This PR modifies the attention configuration generation to reduce tuning time by setting default values for causal, return_lse, with-attn-scale, and with-attn-bias parameters to false when they are not explicitly specified in the problem configuration. This is a performance optimization that reduces the configuration search space by avoiding unnecessary testing of these feature combinations.

Key Changes

• Changed four attention parameters in the default test space from bool_space (['false', 'true']) to default_to_false (['false']), effectively reducing the number of generated test configurations
• Added a comment explaining that undefined parameters should default to false
• This aligns with existing defaults in AttentionConfiguration.from_command_line() and matches common usage patterns seen in tier1-attention-configs

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.