[NVIDIA] Support nvfp4 quantization (#12784)

csrc/quantization/fp4/nvfp4_quant_entry.cu

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2025, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <torch/all.h>
+
+#if defined ENABLE_NVFP4 && ENABLE_NVFP4
+void scaled_fp4_quant_sm100a(torch::Tensor const& output,
+                             torch::Tensor const& input,
+                             torch::Tensor const& output_sf,
+                             torch::Tensor const& input_sf);
+#endif
+
+void scaled_fp4_quant(torch::Tensor& output, torch::Tensor const& input,
+                      torch::Tensor& output_sf, torch::Tensor const& input_sf) {
+#if defined ENABLE_NVFP4 && ENABLE_NVFP4
+  return scaled_fp4_quant_sm100a(output, input, output_sf, input_sf);
+#endif
+  TORCH_CHECK_NOT_IMPLEMENTED(false, "No compiled nvfp4 quantization");
+}