Some questions about data accuracy ？

[luliyucoordinate]

https://github.com/leimao/CUDA-GEMM-Optimization/blob/main/include/profile_utils.cuh#L238

Why is it better to use int here?

https://github.com/leimao/CUDA-GEMM-Optimization/blob/main/src/profile_cuda_gemm_fp16.cu#L14

Why is the accuracy used here so low? I see that the accuracy in apex and torch.test is relatively high.

https://pytorch.org/docs/stable/testing.html
https://github.com/NVIDIA/apex/blob/master/tests/L0/run_fused_layer_norm/test_fused_layer_norm.py#L164

When I implemented gemm, I found that it was difficult to match accuracy with cublas. Why? 😢

[luliyucoordinate]

@leimao