feat: add new custom app (#313)

embedchain/config/apps/OpenSourceAppConfig.py

@@ -8,16 +8,23 @@ class OpenSourceAppConfig(BaseAppConfig):
     Config to initialize an embedchain custom `OpenSourceApp` instance, with extra config options.
     """
 
-    def __init__(self, log_level=None, host=None, port=None, id=None):
+    def __init__(self, log_level=None, host=None, port=None, id=None, model=None):
         """
         :param log_level: Optional. (String) Debug level
         ['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'].
         :param id: Optional. ID of the app. Document metadata will have this id.
         :param host: Optional. Hostname for the database server.
         :param port: Optional. Port for the database server.
+        :param model: Optional. GPT4ALL uses the model to instantiate the class. So unlike `App`, it has to be provided before querying.
         """
+        self.model = model or "orca-mini-3b.ggmlv3.q4_0.bin"
+
         super().__init__(
-            log_level=log_level, ef=OpenSourceAppConfig.default_embedding_function(), host=host, port=port, id=id
+            log_level=log_level,
+            embedding_fn=OpenSourceAppConfig.default_embedding_function(),
+            host=host,
+            port=port,
+            id=id,
         )
 
     @staticmethod