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ppocr/modeling/heads/det_ct_head.py

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+# copyright (c) 2019 PaddlePaddle Authors. All Rights Reserve.
+#
+# 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 math
+import paddle
+from paddle import nn
+import paddle.nn.functional as F
+from paddle import ParamAttr
+
+import math
+from paddle.nn.initializer import TruncatedNormal, Constant, Normal
+
+ones_ = Constant(value=1.0)
+zeros_ = Constant(value=0.0)
+
+
+class CT_Head(nn.Layer):
+    def __init__(
+        self, in_channels, hidden_dim, num_classes, loss_kernel=None, loss_loc=None
+    ):
+        super(CT_Head, self).__init__()
+        self.conv1 = nn.Conv2D(
+            in_channels, hidden_dim, kernel_size=3, stride=1, padding=1
+        )
+        self.bn1 = nn.BatchNorm2D(hidden_dim)
+        self.relu1 = nn.ReLU()
+
+        self.conv2 = nn.Conv2D(
+            hidden_dim, num_classes, kernel_size=1, stride=1, padding=0
+        )
+
+        for m in self.sublayers():
+            if isinstance(m, nn.Conv2D):
+                n = m._kernel_size[0] * m._kernel_size[1] * m._out_channels
+                normal_ = Normal(mean=0.0, std=math.sqrt(2.0 / n))
+                normal_(m.weight)
+            elif isinstance(m, nn.BatchNorm2D):
+                zeros_(m.bias)
+                ones_(m.weight)
+
+    def _upsample(self, x, scale=1):
+        return F.upsample(x, scale_factor=scale, mode="bilinear")
+
+    def forward(self, f, targets=None):
+        out = self.conv1(f)
+        out = self.relu1(self.bn1(out))
+        out = self.conv2(out)
+
+        if self.training:
+            out = self._upsample(out, scale=4)
+            return {"maps": out}
+        else:
+            score = F.sigmoid(out[:, 0, :, :])
+            return {"maps": out, "score": score}