loadLabelMap function
Reads the bundled COCO labelmap (labelmap.txt) from package assets.
Returns the list of label strings, indexable by class index. Some entries
are placeholder ??? strings to keep alignment with the original COCO IDs.
Implementation
Future<List<String>> loadLabelMap() async {
final raw = await rootBundle.loadString(
'packages/object_detection/assets/models/$_labelMapAsset',
);
return raw
.split('\n')
.map((s) => s.trim())
.where((s) => s.isNotEmpty)
.toList(growable: false);
}