1968 Enhance meta data doc-string in SegmentationSaver (#1969)

* [DLMED] enhance doc-strings

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

* [MONAI] python code formatting

Signed-off-by: monai-bot <[email protected]>

Co-authored-by: monai-bot <[email protected]>

Author: Nic-Ma

monai/handlers/segmentation_saver.py

@@ -28,6 +28,9 @@
 class SegmentationSaver:
     """
     Event handler triggered on completing every iteration to save the segmentation predictions into files.
+    It can extract the input image meta data(filename, affine, original_shape, etc.) and resample the predictions
+    based on the meta data.
+
     """
 
     def __init__(
@@ -96,6 +99,7 @@ def __init__(
                 output will be: /output/test1/image/image_seg.nii.gz
             batch_transform: a callable that is used to transform the
                 ignite.engine.batch into expected format to extract the meta_data dictionary.
+                it can be used to extract the input image meta data: filename, affine, original_shape, etc.
             output_transform: a callable that is used to transform the
                 ignite.engine.output into the form expected image data.
                 The first dimension of this transform's output will be treated as the

monai/transforms/io/dictionary.py

@@ -132,9 +132,10 @@ class SaveImaged(MapTransform):
         keys: keys of the corresponding items to be transformed.
             See also: :py:class:`monai.transforms.compose.MapTransform`
         meta_key_postfix: `key_{postfix}` was used to store the metadata in `LoadImaged`.
-            So need the key to extract metadata to save images, default is `meta_dict`.
-            The meta data is a dictionary object, if no corresponding metadata, set to `None`.
-            For example, for data with key `image`, the metadata by default is in `image_meta_dict`.
+            so need the key to extract metadata to save images, default is `meta_dict`.
+            for example, for data with key `image`, the metadata by default is in `image_meta_dict`.
+            the meta data is a dictionary object which contains: filename, affine, original_shape, etc.
+            if no corresponding metadata, set to `None`.
         output_dir: output image directory.
         output_postfix: a string appended to all output file names, default to `trans`.
         output_ext: output file extension name, available extensions: `.nii.gz`, `.nii`, `.png`.