feat: add mx.fast.turboquant_attention for compressed KV cache#3340

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yzamari wants to merge 8 commits intoml-explore:mainfrom

yzamari:feature/turboquant-attention

Commits on Mar 31, 2026

feat: add mx.fast.turboquant_attention for compressed KV cache attention

Yahav Zamari
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perf: apply P1 Metal shader optimizations from audit

Yahav Zamari
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feat: return unnormalized (acc, m, l) for log-sum-exp merge

Yahav Zamari
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feat: add 2-pass TurboQuant kernel for long sequences (N >= 1024)

Yahav Zamari
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fix: 2-pass kernel batch offset for B>1

Yahav Zamari
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test: add comprehensive tests for mx.fast.turboquant_attention

Yahav Zamari
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style: apply pre-commit formatting + add benchmark

Yahav Zamari
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feat: add 4-bit quantization support to turboquant_attention

Yahav Zamari
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