更换文档检测模型

paddle_detection/ppdet/data/utils.py

@@ -0,0 +1,72 @@
+# 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.
+
+import paddle
+import numbers
+import numpy as np
+
+try:
+    from collections.abc import Sequence, Mapping
+except:
+    from collections import Sequence, Mapping
+
+
+def default_collate_fn(batch):
+    """
+    Default batch collating function for :code:`paddle.io.DataLoader`,
+    get input data as a list of sample datas, each element in list
+    if the data of a sample, and sample data should composed of list,
+    dictionary, string, number, numpy array, this
+    function will parse input data recursively and stack number,
+    numpy array and paddle.Tensor datas as batch datas. e.g. for
+    following input data:
+    [{'image': np.array(shape=[3, 224, 224]), 'label': 1},
+     {'image': np.array(shape=[3, 224, 224]), 'label': 3},
+     {'image': np.array(shape=[3, 224, 224]), 'label': 4},
+     {'image': np.array(shape=[3, 224, 224]), 'label': 5},]
+    
+    
+    This default collate function zipped each number and numpy array
+    field together and stack each field as the batch field as follows:
+    {'image': np.array(shape=[4, 3, 224, 224]), 'label': np.array([1, 3, 4, 5])}
+    Args:  
+        batch(list of sample data): batch should be a list of sample data.
+    
+    Returns:
+        Batched data: batched each number, numpy array and paddle.Tensor
+                      in input data.
+    """
+    sample = batch[0]
+    if isinstance(sample, np.ndarray):
+        batch = np.stack(batch, axis=0)
+        return batch
+    elif isinstance(sample, numbers.Number):
+        batch = np.array(batch)
+        return batch
+    elif isinstance(sample, (str, bytes)):
+        return batch
+    elif isinstance(sample, Mapping):
+        return {
+            key: default_collate_fn([d[key] for d in batch])
+            for key in sample
+        }
+    elif isinstance(sample, Sequence):
+        sample_fields_num = len(sample)
+        if not all(len(sample) == sample_fields_num for sample in iter(batch)):
+            raise RuntimeError(
+                "fileds number not same among samples in a batch")
+        return [default_collate_fn(fields) for fields in zip(*batch)]
+
+    raise TypeError("batch data con only contains: tensor, numpy.ndarray, "
+                    "dict, list, number, but got {}".format(type(sample)))