[DLMED] split to 2 examples

Signed-off-by: Nic Ma <[email protected]>

Author: Nic-Ma

modules/bundle/custom_component/README.md

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+# Description
+This example mainly shows a typical use case that applies customized python component(like: transform, network, metrics, etc.) in the `train` config.
+
+Please note that this example depends on the `spleen_segmentation` bundle example and executes via overriding the config file of it.
+
+## commands example
+Export the customized python code to `PYTHONPATH`:
+```
+export PYTHONPATH=$PYTHONPATH:"<path to 'hybrid_programming/scripts'>"
+```
+
+Override the `train` config with one customized `transform` and execute training:
+```
+python -m monai.bundle run training --meta_file <spleen_configs_path>/metadata.json --config_file "['<spleen_configs_path>/train.json','configs/custom_train.json']" --logging_file <spleen_configs_path>/logging.conf
+```

modules/bundles/hybrid_programming/configs/custom_train.json renamed to modules/bundle/custom_component/configs/custom_train.json

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+{
+    "train#preprocessing#transforms#6":
+    {
+        "_target_": "scripts.custom_transforms.PrintEnsureTyped",
+        "keys": ["image", "label"]
+    }
+}

modules/bundles/hybrid_programming/scripts/__init__.py renamed to modules/bundle/custom_component/scripts/__init__.py

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+# Copyright (c) MONAI Consortium
+# 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.

modules/bundles/hybrid_programming/scripts/custom_transforms.py renamed to modules/bundle/custom_component/scripts/custom_transforms.py

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+# Copyright (c) MONAI Consortium
+# 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 monai.config import KeysCollection
+from monai.transforms import EnsureTyped
+
+
+class PrintEnsureTyped(EnsureTyped):
+    """
+    Extend the `EnsureTyped` transform to print the image shape.
+
+     Args:
+        keys: keys of the corresponding items to be transformed.
+
+    """
+
+    def __init__(self, keys: KeysCollection, data_type: str = "tensor") -> None:
+        super().__init__(keys, data_type=data_type)
+
+    def __call__(self, data):
+        d = dict(super().__call__(data=data))
+        for key in self.key_iterator(d):
+            print(f"data shape of {key}: {d[key].shape}")
+        return d