adding very basic support for invoking pretrained classifiers

src/nyckel/__init__.py

@@ -35,5 +35,4 @@
 from .functions.tags.text_tags import TextTagsFunction  # noqa: F401
 from .functions.tags.image_tags import ImageTagsFunction  # noqa: F401
 from .functions.tags.tabular_tags import TabularTagsFunction  # noqa: F401
-
-from .functions.pretrained import invoke as call
+from .functions.pretrained import invoke  # noqa: F401

src/nyckel/functions/pretrained.py

@@ -0,0 +1,9 @@
+from typing import Dict
+
+from nyckel import Credentials
+
+
+def invoke(model_id: str, data: str, client_id: str, client_secret: str) -> Dict:
+    session = Credentials(client_id, client_secret).get_session()
+    endpoint = f"https://www.nyckel.com/v1/functions/{model_id}/invoke"
+    return session.post(endpoint, json={"data": data}).json()