Modify file structure to separate python and cpp code (#223)

Modify code structure

python/fastdeploy/vision/evaluation/utils/map_utils.py

@@ -0,0 +1,40 @@
+# 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.
+
+from __future__ import absolute_import
+import os
+
+
+def draw_pr_curve(precision,
+                  recall,
+                  iou=0.5,
+                  out_dir='pr_curve',
+                  file_name='precision_recall_curve.jpg'):
+    if not os.path.exists(out_dir):
+        os.makedirs(out_dir)
+    output_path = os.path.join(out_dir, file_name)
+    try:
+        import matplotlib.pyplot as plt
+    except Exception as e:
+        # logger.error('Matplotlib not found, plaese install matplotlib.'
+        #              'for example: `pip install matplotlib`.')
+        raise e
+    plt.cla()
+    plt.figure('P-R Curve')
+    plt.title('Precision/Recall Curve(IoU={})'.format(iou))
+    plt.xlabel('Recall')
+    plt.ylabel('Precision')
+    plt.grid(True)
+    plt.plot(recall, precision)
+    plt.savefig(output_path)