perf: use f16 as split-k partial output data type #900
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We use f32 as split-k partial output data type, mainly for accuracy concern.
However, the official FlashMLA implementation uses 16-bit partial data type, so I guess 16bit split-k is enough for production.
This PR changes flashinfer mla implementation's intermediate data type to 16bit.
This is the third piece (4 in total) of split-k related optimizations.