added config_class and base_model_prefix

modeling_bert.py

@@ -298,7 +298,9 @@ class BertPreTrainedModel(PreTrainedModel):
     """An abstract class to handle weights initialization and
     a simple interface for dowloading and loading pretrained models.
     """
-
+    config_class = JinaBertConfig
+    base_model_prefix = "bert"
+    
     def __init__(self, config, *inputs, **kwargs):
         super().__init__()
         if not config.__class__.__name__ == 'JinaBertConfig':