community: docstrings (#23202)

Added missed docstrings. Format docstrings to the consistent format
(used in the API Reference)

libs/community/langchain_community/vectorstores/oraclevs.py

@@ -173,6 +173,16 @@ def create_index(
     vector_store: OracleVS,
     params: Optional[dict[str, Any]] = None,
 ) -> None:
+    """Create an index on the vector store.
+
+    Args:
+        client: The OracleDB connection object.
+        vector_store: The vector store object.
+        params: Optional parameters for the index creation.
+
+    Raises:
+        ValueError: If an invalid parameter is provided.
+    """
     if params:
         if params["idx_type"] == "HNSW":
             _create_hnsw_index(
@@ -351,6 +361,15 @@ def _create_ivf_index(
 
 @_handle_exceptions
 def drop_table_purge(client: Connection, table_name: str) -> None:
+    """Drop a table and purge it from the database.
+
+    Args:
+        client: The OracleDB connection object.
+        table_name: The name of the table to drop.
+
+    Raises:
+        RuntimeError: If an error occurs while dropping the table.
+    """
     if _table_exists(client, table_name):
         cursor = client.cursor()
         with cursor:
@@ -364,6 +383,15 @@ def drop_table_purge(client: Connection, table_name: str) -> None:
 
 @_handle_exceptions
 def drop_index_if_exists(client: Connection, index_name: str) -> None:
+    """Drop an index if it exists.
+
+    Args:
+        client: The OracleDB connection object.
+        index_name: The name of the index to drop.
+
+    Raises:
+        RuntimeError: If an error occurs while dropping the index.
+    """
     if _index_exists(client, index_name):
         drop_query = f"DROP INDEX {index_name}"
         with client.cursor() as cursor:

libs/community/langchain_community/vectorstores/vectara.py

@@ -748,6 +748,14 @@ class VectaraRetriever(VectorStoreRetriever):
 
 
 class VectaraRAG(Runnable):
+    """Vectara RAG runnable.
+
+    Parameters:
+        vectara: Vectara object
+        config: VectaraQueryConfig object
+        chat: bool, default False
+    """
+
     def __init__(
         self, vectara: Vectara, config: VectaraQueryConfig, chat: bool = False
     ):
@@ -762,10 +770,12 @@ class VectaraRAG(Runnable):
         config: Optional[RunnableConfig] = None,
         **kwargs: Any,
     ) -> Iterator[dict]:
-        """get streaming output from Vectara RAG
+        """Get streaming output from Vectara RAG.
 
         Args:
-            query: The input query
+            input: The input query
+            config: RunnableConfig object
+            kwargs: Any additional arguments
 
         Returns:
             The output dictionary with question, answer and context