per_token_group_quant_fp8 opt

vllm/model_executor/layers/quantization/utils/fp8_utils.py

@@ -915,6 +915,37 @@ def _per_token_group_quant_fp8_colmajor(
     tl.store(y_s_ptr, y_s)
 
 
+def _lightop_per_token_group_quant_fp8_impl(
+    x_q: torch.Tensor,
+    x: torch.Tensor,
+    x_s: torch.Tensor,
+    group_size: int,
+    eps: float,
+    use_ue8m0: bool,
+) -> None:
+    from lightop import op
+    op.per_token_group_quant_fp8(x_q, x, x_s, group_size, eps, use_ue8m0)
+
+
+def _lightop_per_token_group_quant_fp8_fake(
+    x_q: torch.Tensor,
+    x: torch.Tensor,
+    x_s: torch.Tensor,
+    group_size: int,
+    eps: float,
+    use_ue8m0: bool,
+) -> None:
+    pass
+
+
+direct_register_custom_op(
+    "lightop_per_token_group_quant_fp8",
+    _lightop_per_token_group_quant_fp8_impl,
+    mutates_args=["x_q", "x_s"],
+    fake_impl=_lightop_per_token_group_quant_fp8_fake,
+)
+
+
 def per_token_group_quant_fp8(
     x: torch.Tensor,
     group_size: int,
@@ -981,6 +1012,10 @@ def per_token_group_quant_fp8(
         shape = x.shape[:-1] + (x.shape[-1] // group_size,)
         x_s = torch.empty(shape, device=x.device, dtype=torch.float32)
     
+    if envs.USE_LIGHTOP_PER_TOKEN_GROUP_QUANT_FP8 and not column_major_scales:
+        torch.ops.vllm.lightop_per_token_group_quant_fp8(x_q, x, x_s, group_size, eps, use_ue8m0)
+        return x_q, x_s
+    
     # prefer CUDA kernel if available
     # TODO(bnell): this causes some fp8 moe test to fail.
     if current_platform.is_cuda() and x.is_contiguous():