LocalIndex Now Using Placeholder BaseIndex Class

Also fixed bug in layer.py where we weren't:
a) Setting the index_name to a default value.
b) Weren't using index_name.

semantic_router/indices/base.py

 from pydantic.v1 import BaseModel
 
 class BaseIndex(BaseModel):
-
     pass
\ No newline at end of file

semantic_router/indices/local_index.py

 import numpy as np
 from typing import List, Any
 from semantic_router.linear import similarity_matrix, top_scores
-from pydantic import BaseModel
+from semantic_router.indices.base import BaseIndex
 import numpy as np
 from typing import List, Any, Tuple, Optional
 
-class LocalIndex(BaseModel):
+class LocalIndex(BaseIndex):
     index: Optional[np.ndarray] = None
 
     class Config: # Stop pydantic from complaining about  Optional[np.ndarray] type hints.

semantic_router/layer.py

@@ -164,10 +164,10 @@ class RouteLayer:
         encoder: Optional[BaseEncoder] = None,
         llm: Optional[BaseLLM] = None,
         routes: Optional[List[Route]] = None,
-        index_name: Optional[str] = None,
+        index_name: Optional[str] = "local",
     ):
         logger.info("local")
-        self.index = Index.get_by_name(index_name="local")
+        self.index = Index.get_by_name(index_name=index_name)
         self.categories = None
         if encoder is None:
             logger.warning(