Update transforms handling in Dataset (cvat-ai#297)

* Update builtin transforms

* Optimize dataset length computation when no source

* Add filter test

* Fix transforms affecting categories

* Optimize categories transforms

* Update filters

* fix imports

* Avoid using default docstrings in plugins

* Fix patch saving in VOC, add keep_empty export parameter

* Fix flush_changes

* Fix removed images and subsets in dataset patch

* Update changelog

* Update voc doc

* Skip item transform base class in plugins

CHANGELOG.md

@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Subformat importers for VOC and COCO (<https://github.com/openvinotoolkit/datumaro/pull/281>)
 - Support for KITTI dataset segmentation and detection format (<https://github.com/openvinotoolkit/datumaro/pull/282>)
 - Updated YOLO format user manual (<https://github.com/openvinotoolkit/datumaro/pull/295>)
+- `ItemTransform` class, which describes item-wise dataset `Transform`s (<https://github.com/openvinotoolkit/datumaro/pull/297>)
+- `keep-empty` export parameter in VOC format (<https://github.com/openvinotoolkit/datumaro/pull/297>)
 - A base class for dataset validation plugins (<https://github.com/openvinotoolkit/datumaro/pull/299>)
 
 ### Changed
@@ -26,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Incorrect image layout on saving and a problem with ecoding on loading (<https://github.com/openvinotoolkit/datumaro/pull/284>)
 - An error when xpath fiter is applied to the dataset or its subset (<https://github.com/openvinotoolkit/datumaro/issues/259>)
+- Tracking of `Dataset` changes done by transforms (<https://github.com/openvinotoolkit/datumaro/pull/297>)
 - Improved CLI startup time in several cases (<https://github.com/openvinotoolkit/datumaro/pull/306>)
 
 ### Security

datumaro/components/cli_plugin.py

@@ -18,7 +18,17 @@ def _get_name(cls):
 
     @staticmethod
     def _get_doc(cls):
-        return getattr(cls, '__doc__', "")
+        doc = getattr(cls, '__doc__', "")
+        if doc:
+            from datumaro.components.launcher import Launcher
+            from datumaro.components.extractor import Extractor, Transform, \
+                Importer
+            from datumaro.components.converter import Converter
+            base_classes = [Launcher, Extractor, Transform, Importer, Converter]
+
+            if any(getattr(t, '__doc__', '') == doc for t in base_classes):
+                doc = ''
+        return doc
 
     @classmethod
     def build_cmdline_parser(cls, **kwargs):