Add linspace

fastdeploy/function/linspace.cc

@@ -0,0 +1,52 @@
+// Copyright (c) 2022 PaddlePaddle Authors. 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 "fastdeploy/function/linspace.h"
+
+namespace fastdeploy {
+namespace function {
+
+template <typename T>
+void LinspaceKernel(double start, double end, int num, FDTensor* out) {
+  FDASSERT(
+      num > 0,
+      "The num of linspace op should be larger than 0, but received num is %d",
+      num);
+  out->Allocate({num}, TypeToDataType<T>::dtype);
+  T* out_data = reinterpret_cast<T*>(out->Data());
+  if (num > 1) {
+    // step should be of double type for all types
+    double step = (static_cast<double>(end - start)) / (num - 1);
+    int half_num = num / 2;
+    for (int i = 0; i < num; ++i) {
+      if (i < half_num) {
+        out_data[i] = static_cast<T>(start + step * i);
+      } else {
+        out_data[i] = static_cast<T>(end - step * (num - i - 1));
+      }
+    }
+  } else {
+    out_data[0] = static_cast<T>(start);
+  }
+}
+
+void Linspace(double start, double end, int num, FDTensor* out,
+              FDDataType dtype) {
+  FD_VISIT_INT_FLOAT_TYPES(dtype, "LinspaceKernel", ([&] {
+                             LinspaceKernel<data_t>(start, end, num, out);
+                           }));
+}
+
+}  // namespace function
+}  // namespace fastdeploy