mxfp4 is a block-based floating point format. The E2M1 format applies to individual values, but each 32-values block also has a shared 8-bit floating point expo

mxfp4 is a block-based floating point format. The E2M1 format applies to individual values, but each 32-values block also has a shared 8-bit floating point exponent to provide scaling information about the whole block.