submission 655098

from task import input_t, output_t
import aiter
from aiter import QuantType, dtypes
from aiter.ops.triton.quant import dynamic_mxfp4_quant 
from aiter.utility.fp4_utils import e8m0_shuffle


def _quant_mxfp4(x, shuffle=True):
    x_fp4, bs_e8m0 = dynamic_mxfp4_quant(x)
    if shuffle:
        bs_e8m0 = e8m0_shuffle(bs_e8m0)
    return x_fp4.view(dtypes.fp4x2), bs_e8m0.view(dtypes.fp8_e8m0)


def _kernel_gemm_a4w4(A_q, B_shuffle, A_scale_sh, B_scale_sh):
    out_gemm = aiter.gemm_a4w4(
        A_q,
        B_shuffle,
        A_scale_sh,
        B_scale_sh,
        dtype=dtypes.bf16,
        bpreshuffle=True,
    )
    return out_gemm


def custom_kernel(data: input_t) -> output_t:
    A, B, B_q, B_shuffle, B_scale_sh = data
    A = A.contiguous()
    B = B.contiguous()
    m, k = A.shape
    n, _ = B.shape

    A_q, A_scale_sh = _quant_mxfp4(A, shuffle=True)
    out_gemm = _kernel_gemm_a4w4(
        A_q,
        B_shuffle,
        A_scale_sh,
        B_scale_sh,
    )
    return out_gemm