fix string formatting issue

Author: JohannesBuchner

keras/src/applications/densenet.py

@@ -487,6 +487,6 @@ def decode_predictions(preds, top=5):
     A Keras model instance.
 """
 
-setattr(DenseNet121, "__doc__", (DenseNet121.__doc__ or '') + DOC)
-setattr(DenseNet169, "__doc__", (DenseNet169.__doc__ or '') + DOC)
-setattr(DenseNet201, "__doc__", (DenseNet201.__doc__ or '') + DOC)
+setattr(DenseNet121, "__doc__", (DenseNet121.__doc__ or "") + DOC)
+setattr(DenseNet169, "__doc__", (DenseNet169.__doc__ or "") + DOC)
+setattr(DenseNet201, "__doc__", (DenseNet201.__doc__ or "") + DOC)

keras/src/optimizers/adam.py

@@ -148,6 +148,7 @@ def get_config(self):
         )
         return config
 
+
 if Adam.__doc__ is not None:
     Adam.__doc__ = Adam.__doc__.replace(
         "{{base_optimizer_keyword_args}}", optimizer.base_optimizer_keyword_args

keras/src/optimizers/ftrl.py

@@ -233,6 +233,7 @@ def get_config(self):
         )
         return config
 
+
 if Ftrl.__doc__ is not None:
     Ftrl.__doc__ = Ftrl.__doc__.replace(
         "{{base_optimizer_keyword_args}}", optimizer.base_optimizer_keyword_args