fix wrong use of len(data) in examples

examples/GAN/CycleGAN.py

@@ -223,6 +223,6 @@ if __name__ == '__main__':
             PeriodicTrigger(VisualizeTestSet(), every_k_epochs=3),
         ],
         max_epoch=195,
-        steps_per_epoch=len(data),
+        steps_per_epoch=data.size(),
         session_init=SaverRestore(args.load) if args.load else None
     )

examples/GAN/Image2Image.py

@@ -223,7 +223,7 @@ if __name__ == '__main__':
                 PeriodicTrigger(ModelSaver(), every_k_epochs=3),
                 ScheduledHyperParamSetter('learning_rate', [(200, 1e-4)])
             ],
-            steps_per_epoch=len(data),
+            steps_per_epoch=data.size(),
             max_epoch=300,
             session_init=SaverRestore(args.load) if args.load else None
         )

examples/SuperResolution/enet-pat.py

@@ -298,6 +298,6 @@ if __name__ == '__main__':
                 ModelSaver(keep_checkpoint_every_n_hours=2)
             ],
             session_init=session_init,
-            steps_per_epoch=len(data) // 4,
+            steps_per_epoch=data.size() // 4,
             max_epoch=300
         )