Fixed ValueError: operands could not be broadcast together with shape…

…s (X, ) (Y, ) (#8179)

changelog.d/20240717_125734_boris_fixed_export_skeletons.md

@@ -0,0 +1,5 @@
+### Fixed
+
+- Exporting a skeleton track in a format defined for shapes raises error 
+`operands could not be broadcast together with shapes (X, ) (Y, )`
+  (<https://github.com/cvat-ai/cvat/pull/8179>)

cvat-core/src/annotations-objects.ts

@@ -2999,6 +2999,12 @@ export class SkeletonTrack extends Track {
     // Method is used to export data to the server
     public toJSON(): SerializedTrack {
         const result: SerializedTrack = Track.prototype.toJSON.call(this);
+
+        result.shapes = result.shapes.map((shape) => ({
+            ...shape,
+            points: [],
+        }));
+
         result.elements = this.elements.map((el) => ({
             ...el.toJSON(),
             source: this.source,

cvat/apps/dataset_manager/task.py

@@ -563,6 +563,10 @@ def _init_shapes_from_db(self):
         for db_shape in db_shapes:
             self._extend_attributes(db_shape.attributes,
                 self.db_attributes[db_shape.label_id]["all"].values())
+            if db_shape['type'] == str(models.ShapeType.SKELETON):
+                # skeletons themselves should not have points as they consist of other elements
+                # here we ensure that it was initialized correctly
+                db_shape['points'] = []
 
             if db_shape.parent is None:
                 db_shape.elements = []
@@ -649,9 +653,13 @@ def _init_tracks_from_db(self):
             default_attribute_values = self.db_attributes[db_track.label_id]["mutable"].values()
             for db_shape in db_track["shapes"]:
                 db_shape["attributes"] = list(set(db_shape["attributes"]))
-                # in case of trackedshapes need to interpolate attriute values and extend it
+                # in case of trackedshapes need to interpolate attribute values and extend it
                 # by previous shape attribute values (not default values)
                 self._extend_attributes(db_shape["attributes"], default_attribute_values)
+                if db_shape['type'] == str(models.ShapeType.SKELETON):
+                    # skeletons themselves should not have points as they consist of other elements
+                    # here we ensure that it was initialized correctly
+                    db_shape['points'] = []
                 default_attribute_values = db_shape["attributes"]
 
             if db_track.parent is None: