Update model_utils.py

Add Description of load_models()

model_utils.py

@@ -64,6 +64,15 @@ class BiLSTMForTokenClassification(nn.Module):
         return {'loss': loss, 'logits': logits}
 
 def load_models():
+    """
+    Loads the custom BiLSTM NER model and tokenizer from local files.
+
+    Returns:
+        model (BiLSTMForTokenClassification): The loaded BiLSTM NER model.
+        tokenizer (AutoTokenizer): The loaded tokenizer associated with the model.
+        id2label_ner (dict): A dictionary mapping numerical label indices to NER tags.
+    """
+
     model_dir = "./models/bilstm_ner"
     tokenizer_dir = "./models/tokenizer"