Don't apply labels normalization on training (#3886)

* Don't apply labels normalization on training

* Fix black

Author: sovrasov

src/otx/algorithms/classification/utils/cls_utils.py

@@ -26,12 +26,17 @@
 from otx.api.utils.labels_utils import get_normalized_label_name
 
 
-def get_multihead_class_info(label_schema: LabelSchemaEntity):  # pylint: disable=too-many-locals
+def get_multihead_class_info(
+    label_schema: LabelSchemaEntity, normalize_labels: bool = False
+):  # pylint: disable=too-many-locals
     """Get multihead info by label schema."""
     all_groups = label_schema.get_groups(include_empty=False)
     all_groups_str = []
     for g in all_groups:
-        group_labels_str = [get_normalized_label_name(lbl) for lbl in g.labels]
+        if normalize_labels:
+            group_labels_str = [get_normalized_label_name(lbl) for lbl in g.labels]
+        else:
+            group_labels_str = [lbl.name for lbl in g.labels]
         all_groups_str.append(group_labels_str)
 
     single_label_groups = [g for g in all_groups_str if len(g) == 1]
@@ -77,7 +82,7 @@ def get_cls_inferencer_configuration(label_schema: LabelSchemaEntity):
     hierarchical = not multilabel and len(label_schema.get_groups(False)) > 1
     multihead_class_info = {}
     if hierarchical:
-        multihead_class_info = get_multihead_class_info(label_schema)
+        multihead_class_info = get_multihead_class_info(label_schema, normalize_labels=True)
     return {
         "multilabel": multilabel,
         "hierarchical": hierarchical,
@@ -120,7 +125,7 @@ def get_cls_model_api_configuration(label_schema: LabelSchemaEntity, inference_c
     mapi_config[("model_info", "label_ids")] = all_label_ids.strip()
 
     hierarchical_config = {}
-    hierarchical_config["cls_heads_info"] = get_multihead_class_info(label_schema)
+    hierarchical_config["cls_heads_info"] = get_multihead_class_info(label_schema, normalize_labels=True)
     hierarchical_config["label_tree_edges"] = []
     for edge in label_schema.label_tree.edges:  # (child, parent)
         hierarchical_config["label_tree_edges"].append(