fix validation of format field to allow empty strings as it did previously (#369)

ollama/_client.py

@@ -188,7 +188,7 @@ class Client(BaseClient):
     context: Optional[Sequence[int]] = None,
     stream: Literal[False] = False,
     raw: bool = False,
-    format: Optional[Union[Literal['json'], JsonSchemaValue]] = None,
+    format: Optional[Union[Literal['', 'json'], JsonSchemaValue]] = None,
     images: Optional[Sequence[Union[str, bytes]]] = None,
     options: Optional[Union[Mapping[str, Any], Options]] = None,
     keep_alive: Optional[Union[float, str]] = None,
@@ -206,7 +206,7 @@ class Client(BaseClient):
     context: Optional[Sequence[int]] = None,
     stream: Literal[True] = True,
     raw: bool = False,
-    format: Optional[Union[Literal['json'], JsonSchemaValue]] = None,
+    format: Optional[Union[Literal['', 'json'], JsonSchemaValue]] = None,
     images: Optional[Sequence[Union[str, bytes]]] = None,
     options: Optional[Union[Mapping[str, Any], Options]] = None,
     keep_alive: Optional[Union[float, str]] = None,
@@ -223,7 +223,7 @@ class Client(BaseClient):
     context: Optional[Sequence[int]] = None,
     stream: bool = False,
     raw: Optional[bool] = None,
-    format: Optional[Union[Literal['json'], JsonSchemaValue]] = None,
+    format: Optional[Union[Literal['', 'json'], JsonSchemaValue]] = None,
     images: Optional[Sequence[Union[str, bytes]]] = None,
     options: Optional[Union[Mapping[str, Any], Options]] = None,
     keep_alive: Optional[Union[float, str]] = None,
@@ -267,7 +267,7 @@ class Client(BaseClient):
     *,
     tools: Optional[Sequence[Union[Mapping[str, Any], Tool, Callable]]] = None,
     stream: Literal[False] = False,
-    format: Optional[Union[Literal['json'], JsonSchemaValue]] = None,
+    format: Optional[Union[Literal['', 'json'], JsonSchemaValue]] = None,
     options: Optional[Union[Mapping[str, Any], Options]] = None,
     keep_alive: Optional[Union[float, str]] = None,
   ) -> ChatResponse: ...
@@ -280,7 +280,7 @@ class Client(BaseClient):
     *,
     tools: Optional[Sequence[Union[Mapping[str, Any], Tool, Callable]]] = None,
     stream: Literal[True] = True,
-    format: Optional[Union[Literal['json'], JsonSchemaValue]] = None,
+    format: Optional[Union[Literal['', 'json'], JsonSchemaValue]] = None,
     options: Optional[Union[Mapping[str, Any], Options]] = None,
     keep_alive: Optional[Union[float, str]] = None,
   ) -> Iterator[ChatResponse]: ...
@@ -292,7 +292,7 @@ class Client(BaseClient):
     *,
     tools: Optional[Sequence[Union[Mapping[str, Any], Tool, Callable]]] = None,
     stream: bool = False,
-    format: Optional[Union[Literal['json'], JsonSchemaValue]] = None,
+    format: Optional[Union[Literal['', 'json'], JsonSchemaValue]] = None,
     options: Optional[Union[Mapping[str, Any], Options]] = None,
     keep_alive: Optional[Union[float, str]] = None,
   ) -> Union[ChatResponse, Iterator[ChatResponse]]:

ollama/_types.py

@@ -151,7 +151,7 @@ class BaseGenerateRequest(BaseStreamableRequest):
   options: Optional[Union[Mapping[str, Any], Options]] = None
   'Options to use for the request.'
 
-  format: Optional[Union[Literal['json'], JsonSchemaValue]] = None
+  format: Optional[Union[Literal['', 'json'], JsonSchemaValue]] = None
   'Format of the response.'
 
   keep_alive: Optional[Union[float, str]] = None