B200 (SM100) does NOT support kind::mxf4nvf4 at all (neither 2X nor 4X).
Only mxf8f6f4.block_scale with UE8M0 scales is available on SM100.
Strategy: keep NVFP4 E2M1 weights, convert UE4M3 block scales → UE8M0
in the weight transformation. This is a scale format adaptation for
hardware compatibility, not a format conversion.
Changes:
- Kernel: back to mxf8f6F4 instruction + float_ue8m0_t descriptor
- L1 epilogue: back to UE8M0 (>> 23) activation scales
- Python: merge block16→block32, convert UE4M3→float32→UE8M0
- Packing: uint8 (UE8M0) → int32, same as MXFP4
biondizzle
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