load weights is done in a common function

deepface/commons/weight_utils.py

@@ -8,9 +8,15 @@ import bz2
 import gdown
 
 # project dependencies
-from deepface.commons import folder_utils
+from deepface.commons import folder_utils, package_utils
 from deepface.commons.logger import Logger
 
+tf_version = package_utils.get_tf_major_version()
+if tf_version == 1:
+    from keras.models import Sequential
+else:
+    from tensorflow.keras.models import Sequential
+
 logger = Logger()
 
 
@@ -63,3 +69,24 @@ def download_weights_if_necessary(
         logger.info(f"{target_file}.bz2 unzipped")
 
     return target_file
+
+
+def load_model_weights(model: Sequential, weight_file: str) -> Sequential:
+    """
+    Load pre-trained weights for a given model
+    Args:
+        model (keras.models.Sequential): pre-built model
+        weight_file (str): exact path of pre-trained weights
+    Returns:
+        model (keras.models.Sequential): pre-built model with
+            updated weights
+    """
+    try:
+        model.load_weights(weight_file)
+    except Exception as err:
+        raise ValueError(
+            f"Exception while loading pre-trained weights from {weight_file}."
+            "Possible reason is broken file during downloading weights."
+            "You may consider to delete it manually."
+        ) from err
+    return model

deepface/models/demography/Age.py

@@ -69,7 +69,10 @@ def load_model(
     weight_file = weight_utils.download_weights_if_necessary(
         file_name="age_model_weights.h5", source_url=url
     )
-    age_model.load_weights(weight_file)
+
+    age_model = weight_utils.load_model_weights(
+        model=age_model, weight_file=weight_file
+    )
 
     return age_model
 

deepface/models/demography/Emotion.py

@@ -96,6 +96,8 @@ def load_model(
         file_name="facial_expression_model_weights.h5", source_url=url
     )
 
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(
+        model=model, weight_file=weight_file
+    )
 
     return model

deepface/models/demography/Gender.py

@@ -72,6 +72,8 @@ def load_model(
         file_name="gender_model_weights.h5", source_url=url
     )
 
-    gender_model.load_weights(weight_file)
+    gender_model = weight_utils.load_model_weights(
+        model=gender_model, weight_file=weight_file
+    )
 
     return gender_model

deepface/models/demography/Race.py

@@ -69,6 +69,8 @@ def load_model(
         file_name="race_model_single_batch.h5", source_url=url
     )
 
-    race_model.load_weights(weight_file)
+    race_model = weight_utils.load_model_weights(
+        model=race_model, weight_file=weight_file
+    )
 
     return race_model

deepface/models/facial_recognition/ArcFace.py

@@ -82,7 +82,7 @@ def load_model(
         file_name="arcface_weights.h5", source_url=url
     )
 
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(model=model, weight_file=weight_file)
     # ---------------------------------------
 
     return model

deepface/models/facial_recognition/DeepID.py

@@ -89,6 +89,8 @@ def load_model(
         file_name="deepid_keras_weights.h5", source_url=url
     )
 
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(
+        model=model, weight_file=weight_file
+    )
 
     return model

deepface/models/facial_recognition/Facenet.py

@@ -1668,7 +1668,9 @@ def load_facenet128d_model(
     weight_file = weight_utils.download_weights_if_necessary(
         file_name="facenet_weights.h5", source_url=url
     )
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(
+        model=model, weight_file=weight_file
+    )
 
     return model
 
@@ -1687,6 +1689,8 @@ def load_facenet512d_model(
     weight_file = weight_utils.download_weights_if_necessary(
         file_name="facenet512_weights.h5", source_url=url
     )
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(
+        model=model, weight_file=weight_file
+    )
 
     return model

deepface/models/facial_recognition/FbDeepFace.py

@@ -86,7 +86,7 @@ def load_model(
         file_name="VGGFace2_DeepFace_weights_val-0.9034.h5", source_url=url, compress_type="zip"
     )
 
-    base_model.load_weights(weight_file)
+    base_model = weight_utils.load_model_weights(model=base_model, weight_file=weight_file)
 
     # drop F8 and D0. F7 is the representation layer.
     deepface_model = Model(inputs=base_model.layers[0].input, outputs=base_model.layers[-3].output)

deepface/models/facial_recognition/GhostFaceNet.py

@@ -74,7 +74,9 @@ def load_model():
         file_name="ghostfacenet_v1.h5", source_url=PRETRAINED_WEIGHTS
     )
 
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(
+        model=model, weight_file=weight_file
+    )
 
     return model
 

deepface/models/facial_recognition/OpenFace.py

@@ -385,7 +385,9 @@ def load_model(
         file_name="openface_weights.h5", source_url=url
     )
 
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(
+        model=model, weight_file=weight_file
+    )
 
     # -----------------------------------
 

deepface/models/facial_recognition/VGGFace.py

@@ -140,7 +140,9 @@ def load_model(
         file_name="vgg_face_weights.h5", source_url=url
     )
 
-    model.load_weights(weight_file)
+    model = weight_utils.load_model_weights(
+        model=model, weight_file=weight_file
+    )
 
     # 2622d dimensional model
     # vgg_face_descriptor = Model(inputs=model.layers[0].input, outputs=model.layers[-2].output)