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144 lines
4.2 KiB
144 lines
4.2 KiB
import pytest
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import torch
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import torch.nn.functional as F
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from packaging import version
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try:
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import triton
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from colossalai.kernel.triton.qkv_matmul_kernel import qkv_gemm_4d_kernel
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from colossalai.kernel.triton.self_attention_nofusion import self_attention_compute_using_triton
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HAS_TRITON = True
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except ImportError:
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HAS_TRITON = False
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print("please install triton from https://github.com/openai/triton")
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TRITON_CUDA_SUPPORT = version.parse(torch.version.cuda) > version.parse("11.4")
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@pytest.mark.skipif(
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not TRITON_CUDA_SUPPORT or not HAS_TRITON, reason="triton requires cuda version to be higher than 11.4"
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)
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def test_qkv_matmul():
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qkv = torch.randn((4, 24, 64 * 3), device="cuda", dtype=torch.float16)
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scale = 1.2
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head_size = 32
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batches = qkv.shape[0]
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d_model = qkv.shape[-1] // 3
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num_of_heads = d_model // head_size
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q = qkv[:, :, :d_model]
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k = qkv[:, :, d_model : d_model * 2]
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q = q.view(batches, -1, num_of_heads, head_size)
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k = k.view(batches, -1, num_of_heads, head_size)
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q_copy = q.clone()
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k_copy = k.clone()
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q = torch.transpose(q, 1, 2).contiguous()
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k = torch.transpose(k, 1, 2).contiguous()
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k = torch.transpose(k, 2, 3).contiguous()
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torch_ouput = torch.einsum("bnij,bnjk->bnik", q, k)
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torch_ouput *= 1.2
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q, k = q_copy, k_copy
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batches, M, H, K = q.shape
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N = k.shape[1]
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score_output = torch.empty((batches, H, M, N), device=q.device, dtype=q.dtype)
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grid = lambda meta: (
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batches,
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H,
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triton.cdiv(M, meta["BLOCK_SIZE_M"]) * triton.cdiv(N, meta["BLOCK_SIZE_N"]),
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)
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K = q.shape[3]
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qkv_gemm_4d_kernel[grid](
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q,
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k,
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score_output,
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M,
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N,
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K,
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q.stride(0),
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q.stride(2),
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q.stride(1),
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q.stride(3),
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k.stride(0),
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k.stride(2),
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k.stride(3),
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k.stride(1),
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score_output.stride(0),
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score_output.stride(1),
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score_output.stride(2),
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score_output.stride(3),
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scale=scale,
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# currently manually setting, later on we can use auto-tune config to match best setting
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BLOCK_SIZE_M=64,
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BLOCK_SIZE_N=32,
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BLOCK_SIZE_K=32,
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GROUP_SIZE_M=8,
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)
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check = torch.allclose(torch_ouput.cpu(), score_output.cpu(), rtol=1e-3, atol=1e-5)
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assert check is True, "the outputs of triton and torch are not matched"
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def self_attention_compute_using_torch(qkv, input_mask, scale, head_size):
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batches = qkv.shape[0]
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d_model = qkv.shape[-1] // 3
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num_of_heads = d_model // head_size
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q = qkv[:, :, :d_model]
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k = qkv[:, :, d_model : d_model * 2]
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v = qkv[:, :, d_model * 2 :]
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q = q.view(batches, -1, num_of_heads, head_size)
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k = k.view(batches, -1, num_of_heads, head_size)
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v = v.view(batches, -1, num_of_heads, head_size)
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q = torch.transpose(q, 1, 2).contiguous()
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k = torch.transpose(k, 1, 2).contiguous()
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v = torch.transpose(v, 1, 2).contiguous()
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k = torch.transpose(k, -1, -2).contiguous()
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score_output = torch.einsum("bnij,bnjk->bnik", q, k)
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score_output *= scale
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softmax_output = F.softmax(score_output, dim=-1)
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res = torch.einsum("bnij,bnjk->bnik", softmax_output, v)
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res = torch.transpose(res, 1, 2)
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res = res.contiguous()
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return res.view(batches, -1, d_model), score_output, softmax_output
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@pytest.mark.skipif(
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not TRITON_CUDA_SUPPORT or not HAS_TRITON, reason="triton requires cuda version to be higher than 11.4"
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)
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def test_self_atttention_test():
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qkv = torch.randn((4, 24, 64 * 3), device="cuda", dtype=torch.float16)
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data_output_torch, score_output_torch, softmax_output_torch = self_attention_compute_using_torch(
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qkv.clone(), input_mask=None, scale=1.2, head_size=32
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)
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data_output_triton = self_attention_compute_using_triton(
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qkv.clone(),
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alibi=None,
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head_size=32,
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scale=1.2,
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input_mask=None,
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layer_past=None,
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use_flash=False,
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triangular=True,
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)
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check = torch.allclose(data_output_triton.cpu(), data_output_torch.cpu(), rtol=1e-4, atol=1e-2)
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assert check is True, "the triton output is not matched with torch output"
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if __name__ == "__main__":
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test_qkv_matmul()
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test_self_atttention_test()
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