[cherry-pick] Retrain ResNet20 model to work with older TF versions (#127)

integrations/keras/prune_resnet20.py

@@ -65,7 +65,9 @@ def download_model_and_recipe(root_dir: str):
     Download pretrained model and a pruning recipe
     """
     model_dir = os.path.join(root_dir, "resnet20_v1")
-    zoo_model = Zoo.load_model(
+
+    # Load base model to prune
+    base_zoo_model = Zoo.load_model(
         domain="cv",
         sub_domain="classification",
         architecture="resnet_v1",
@@ -74,18 +76,21 @@ def download_model_and_recipe(root_dir: str):
         repo="sparseml",
         dataset="cifar_10",
         training_scheme=None,
-        optim_name="pruned",
-        optim_category="conservative",
+        optim_name="base",
+        optim_category=None,
         optim_target=None,
         override_parent_path=model_dir,
     )
-    zoo_model.download()
-    model_file_path = zoo_model.framework_files[0].downloaded_path()
+    base_zoo_model.download()
+    model_file_path = base_zoo_model.framework_files[0].downloaded_path()
     if not os.path.exists(model_file_path) or not model_file_path.endswith(".h5"):
         raise RuntimeError("Model file not found: {}".format(model_file_path))
-    recipe_file_path = zoo_model.recipes[0].downloaded_path()
-    if not os.path.exists(recipe_file_path):
-        raise RuntimeError("Recipe file not found: {}".format(recipe_file_path))
+
+    # Simply use the recipe stub
+    recipe_file_path = (
+        "zoo:cv/classification/resnet_v1-20/keras/sparseml/cifar_10/pruned-conservative"
+    )
+
     return model_file_path, recipe_file_path
 
 
@@ -132,6 +137,7 @@ def main():
     (X_train, y_train), (X_test, y_test) = load_and_normalize_cifar10()
 
     model_file_path, recipe_file_path = download_model_and_recipe(root_dir)
+
     print("Load pretrained model")
     base_model = tf.keras.models.load_model(model_file_path)
     base_model.summary()