更换文档检测模型

paddle_detection/ppdet/modeling/losses/fairmot_loss.py

@@ -0,0 +1,41 @@
+# Copyright (c) 2021 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
+from __future__ import division
+from __future__ import print_function
+
+import paddle
+import paddle.nn as nn
+from paddle.nn.initializer import Constant
+from ppdet.core.workspace import register
+
+__all__ = ['FairMOTLoss']
+
+
+@register
+class FairMOTLoss(nn.Layer):
+    def __init__(self):
+        super(FairMOTLoss, self).__init__()
+        self.det_weight = self.create_parameter(
+            shape=[1], default_initializer=Constant(-1.85))
+        self.reid_weight = self.create_parameter(
+            shape=[1], default_initializer=Constant(-1.05))
+
+    def forward(self, det_loss, reid_loss):
+        loss = paddle.exp(-self.det_weight) * det_loss + paddle.exp(
+            -self.reid_weight) * reid_loss + (self.det_weight + self.reid_weight
+                                              )
+        loss *= 0.5
+        return {'loss': loss}