adding model directory

model.py

@@ -35,6 +35,10 @@ class BertClassifier(LabelStudioMLBase):
     def __init__(self, project_id=None, label_config=None, **kwargs):
         super(BertClassifier, self).__init__(project_id=project_id, label_config=label_config)
         
+        # Set up model directory
+        self.model_dir = os.path.join(os.path.dirname(__file__), 'model')
+        os.makedirs(self.model_dir, exist_ok=True)
+        
         # Parse label config to get categories
         from label_studio_ml.model import parse_config
         parsed_config = parse_config(label_config)