enable torchao int4 on cpu side#69
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airMeng wants to merge 2 commits intomingfeima:cpu_opt_ww11from
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1. brgemm impl: move brgemm out of inner loop 2. avx512 impl: move scaling out of inner loop 3. fp8_scaled_mm: change BLOCK_M to 128 to reduce access to B 4. cvt_fp8_bf16: ignore NaN handling ``` Comparing: True max_diff = 0.01562, asum = 10.562, bsum = 10.375 gemm_bf16(native): 89.812 us, gemm_fp8(opt): 124.585 us Comparing: True max_diff = 0.01562, asum = -32.500, bsum = -32.750 gemm_bf16(native): 83.805 us, gemm_fp8(opt): 125.586 us Comparing: True max_diff = 0.01562, asum = -35.750, bsum = -36.500 gemm_bf16(native): 89.579 us, gemm_fp8(opt): 151.284 us Comparing: True max_diff = 0.03125, asum = 4512.000, bsum = 4512.000 gemm_bf16(native): 262.104 us, gemm_fp8(opt): 615.823 us ``` ``` Comparing: True max_diff = 0.01562, asum = 10.562, bsum = 10.375 gemm_bf16(native): 86.403 us, gemm_fp8(opt): 95.792 us Comparing: True max_diff = 0.01562, asum = -32.500, bsum = -32.750 gemm_bf16(native): 84.178 us, gemm_fp8(opt): 100.573 us Comparing: True max_diff = 0.01562, asum = -35.750, bsum = -36.500 gemm_bf16(native): 90.365 us, gemm_fp8(opt): 114.198 us Comparing: True max_diff = 0.03125, asum = 4512.000, bsum = 4512.000 gemm_bf16(native): 267.053 us, gemm_fp8(opt): 404.231 us ```
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