StopIteration: generator_output = next(output_generator)

[asjad18]

Hi, I have followed this tutorial step by step for skin segmentation task, but when I execute model.train() , I get the error mentioned in title. I am using tensorflow 1.15 and keras 2.0.8

[mohsinht]

Same here.

CODE:

start_train = time.time()
model.train(train_data, test_data, 
            learning_rate=config.LEARNING_RATE, 
            epochs=5, 
            layers='heads')
end_train = time.time()
minutes = round((end_train - start_train) / 60, 2)
print(f'Training took {minutes} minutes')

ERROR:

StopIteration                             Traceback (most recent call last)
<ipython-input-23-1abede8f6975> in <module>
      3             learning_rate=config.LEARNING_RATE,
      4             epochs=5,
----> 5             layers='heads')
      6 end_train = time.time()
      7 minutes = round((end_train - start_train) / 60, 2)

/kaggle/working/Mask_RCNN/mrcnn/model.py in train(self, train_dataset, val_dataset, learning_rate, epochs, layers, augmentation, custom_callbacks, no_augmentation_sources)
   2372             max_queue_size=100,
   2373             workers=workers,
-> 2374             use_multiprocessing=True,
   2375         )
   2376         self.epoch = max(self.epoch, epochs)

/opt/conda/lib/python3.6/site-packages/keras/legacy/interfaces.py in wrapper(*args, **kwargs)
     85                 warnings.warn('Update your `' + object_name +
     86                               '` call to the Keras 2 API: ' + signature, stacklevel=2)
---> 87             return func(*args, **kwargs)
     88         wrapper._original_function = func
     89         return wrapper

/opt/conda/lib/python3.6/site-packages/keras/engine/training.py in fit_generator(self, generator, steps_per_epoch, epochs, verbose, callbacks, validation_data, validation_steps, class_weight, max_queue_size, workers, use_multiprocessing, shuffle, initial_epoch)
   2009                 batch_index = 0
   2010                 while steps_done < steps_per_epoch:
-> 2011                     generator_output = next(output_generator)
   2012 
   2013                     if not hasattr(generator_output, '__len__'):

StopIteration: ```