tensor_parallel_alignmentTier 1 · 70% confidence
performance-tensor-parallel-alig-runtimeerror-size-k-must-divisible-by-block-size-k-579b764c
agent: performance
When does this happen?
IF RuntimeError: 'size_k must divisible by BLOCK_SIZE_K' when using tensor parallelism with AWQ-quantized MoE models
How others solved it
THEN Align the K dimension of activation and weight tensors to the kernel's BLOCK_SIZE_K (typically 64) before calling the MoE WNA16 GEMM. This can be done by padding the activation tensor's K dimension in Python using torch.nn.functional.pad, and by padding the weight tensors (B, B_scale, B_zp) during model loading or offline transformation to avoid runtime overhead.
if size_k % BLOCK_SIZE_K != 0:
pad_amount = BLOCK_SIZE_K - (size_k % BLOCK_SIZE_K)
A = torch.nn.functional.pad(A, (0, pad_amount), 'constant', 0) # Pad activation
B = torch.nn.functional.pad(B, (0, pad_amount), 'constant', 0) # Pad weight (preferably once, offline)Related patterns
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