[Functions] Add +-*/ operators and reshape for FDTensor (#655)

* Add +-*/ functions

* Add same dims test case for operations

* add broadcast 0

* Add broadcast dim2 testcase

* Add broadcast dim3 and dim4 testcase

* Add +-*/ operators

* Add mixed operation

* refresh code style

* Add reshape op

* update code style

fastdeploy/function/elementwise.cc

@@ -0,0 +1,75 @@
+// 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/elementwise.h"
+#include "fastdeploy/function/eigen.h"
+#include "fastdeploy/function/elementwise_base.h"
+#include "fastdeploy/function/elementwise_functor.h"
+#include "fastdeploy/utils/utils.h"
+#include <algorithm>
+
+namespace fastdeploy {
+namespace function {
+
+DEFINE_ELEMENTWISE_OP(Add);
+DEFINE_ELEMENTWISE_OP(Multiply);
+DEFINE_ELEMENTWISE_OP(Subtract);
+DEFINE_ELEMENTWISE_OP(Divide);
+
+void Add(const FDTensor& x, const FDTensor& y, FDTensor* out) {
+  FD_VISIT_ALL_TYPES(x.dtype, "AddRawKernel",
+                     ([&] { AddRawKernel<data_t>()(x, y, -1, out); }));
+}
+
+FDTensor operator+(const FDTensor& x, const FDTensor& y) {
+  FDTensor out;
+  Add(x, y, &out);
+  return out;
+}
+
+void Subtract(const FDTensor& x, const FDTensor& y, FDTensor* out) {
+  FD_VISIT_ALL_TYPES(x.dtype, "SubtractRawKernel",
+                     ([&] { SubtractRawKernel<data_t>()(x, y, -1, out); }));
+}
+
+FDTensor operator-(const FDTensor& x, const FDTensor& y) {
+  FDTensor out;
+  Subtract(x, y, &out);
+  return out;
+}
+
+void Multiply(const FDTensor& x, const FDTensor& y, FDTensor* out) {
+  FD_VISIT_ALL_TYPES(x.dtype, "MultiplyRawKernel",
+                     ([&] { MultiplyRawKernel<data_t>()(x, y, -1, out); }));
+}
+
+FDTensor operator*(const FDTensor& x, const FDTensor& y) {
+  FDTensor out;
+  Multiply(x, y, &out);
+  return out;
+}
+
+void Divide(const FDTensor& x, const FDTensor& y, FDTensor* out) {
+  FD_VISIT_ALL_TYPES(x.dtype, "DivideRawKernel",
+                     ([&] { DivideRawKernel<data_t>()(x, y, -1, out); }));
+}
+
+FDTensor operator/(const FDTensor& x, const FDTensor& y) {
+  FDTensor out;
+  Divide(x, y, &out);
+  return out;
+}
+
+}  // namespace function
+}  // namespace fastdeploy