implementation detail · filed under inference & serving
MXFP4 tensor packing
Packs two FP4 values into each uint8 value; the evidence also notes block scales.
Also called pack every two values in one uint8 value.
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How sources treat it
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used 1
Documented in
Evidence
1 span quoted from the sources, strongest treatment first.
We pack every two values in one `uint8` value.
usedsoftware implementationin gpt-ossOpenAI
Filed alongside
Other methods under inference & serving :: inference quantization.
FP8 KV-cache quantizationFP8FP4 KV-cache quantizationNVFP4 quantizationFour-Over-SixMXFP4 weight quantizationPost-training quantizationQuantizationBlock-scaled INT8 quantization with stochastic roundingFP8 E4M3 quantizationGGUFMax-based scalingMSE-based scalingMXFP8 activation quantizationNVFP4 KV-cache quantizationNVFP4 ModelOpt re-quantizationSSM cache quantizationAWQ INT4 weight quantization (W4A16)BF16 inferenceBlock-wise E4M3 FP8 weight quantizationChannel-wise quantizationDynamic activation scalingEmbedding and KV-cache quantizationEmpirical bits-per-element budget selection