Move cpp code to directory csrcs (#42)

* move cpp code to csrcs

* move cpp code to csrcs

fastdeploy/backends/common/multiclass_nms.h

@@ -1,45 +0,0 @@
-// 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.
-
-#pragma once
-#include <map>
-#include <string>
-#include <vector>
-
-namespace fastdeploy {
-namespace backend {
-struct MultiClassNMS {
-  int64_t background_label = -1;
-  int64_t keep_top_k = -1;
-  float nms_eta;
-  float nms_threshold = 0.7;
-  int64_t nms_top_k;
-  bool normalized;
-  float score_threshold;
-
-  std::vector<int32_t> out_num_rois_data;
-  std::vector<int32_t> out_index_data;
-  std::vector<float> out_box_data;
-  void FastNMS(const float* boxes, const float* scores, const int& num_boxes,
-               std::vector<int>* keep_indices);
-  int NMSForEachSample(const float* boxes, const float* scores, int num_boxes,
-                       int num_classes,
-                       std::map<int, std::vector<int>>* keep_indices);
-  void Compute(const float* boxes, const float* scores,
-               const std::vector<int64_t>& boxes_dim,
-               const std::vector<int64_t>& scores_dim);
-};
-}  // namespace backend
-
-}  // namespace fastdeploy