[Bug] Fix DeepGemm Init Error (#21554)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

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

@@ -366,7 +366,7 @@ def per_token_group_quant_fp8(
     dtype: Optional[torch.dtype] = None,
     column_major_scales: bool = False,
     out_q: Optional[torch.Tensor] = None,
-    use_ue8m0: bool = is_blackwell_deep_gemm_used(),
+    use_ue8m0: Optional[bool] = None,
 ) -> tuple[torch.Tensor, torch.Tensor]:
     """Function to perform per-token-group quantization on an input tensor `x`.
     It converts the tensor values into signed float8 values and returns the
@@ -383,6 +383,10 @@ def per_token_group_quant_fp8(
         tuple[torch.Tensor, torch.Tensor]: The quantized tensor and the
         scaling factor.
     """
+    # TODO(wentao): refactor this
+    # use_ue8m0 should be a global flag that could be set by user
+    if use_ue8m0 is None:
+        use_ue8m0 = is_blackwell_deep_gemm_used()
     dtype = current_platform.fp8_dtype() if dtype is None else dtype
     assert (x.shape[-1] % group_size == 0), (
         f"the last dimension of `x` {x.shape[-1]} must be divisible "