model serialization fix

Author: prasankh

ads/opctl/operator/lowcode/forecast/whatifserve/deployment_manager.py

@@ -11,7 +11,7 @@
 import oci
 
 import pandas as pd
-from joblib import dump
+import cloudpickle
 
 from ads.opctl import logger
 from ads.common.model_export_util import prepare_generic_model
@@ -93,7 +93,8 @@ def save_to_catalog(self):
             os.mkdir(self.path_to_artifact)
 
         artifact_dict = {"spec": self.spec.to_dict(), "models": self.model_obj}
-        dump(artifact_dict, os.path.join(self.path_to_artifact, "model.joblib"))
+        with open(f"{self.path_to_artifact}/models.pickle", "wb") as f:
+            cloudpickle.dump(artifact_dict, f)
         artifact = prepare_generic_model(
             self.path_to_artifact,
             function_artifacts=False,

ads/opctl/operator/lowcode/forecast/whatifserve/score.py

@@ -44,7 +44,7 @@ def load_model():
     """
     model_dir = os.path.dirname(os.path.realpath(__file__))
     contents = os.listdir(model_dir)
-    model_file_name = "model.joblib"
+    model_file_name = "models.pickle"
     if model_file_name in contents:
         with open(os.path.join(os.path.dirname(os.path.realpath(__file__)), model_file_name), "rb") as file:
             model = load(file)