local variable ‘batch_index‘ referenced before assignment

求解，這個是什麼原因，File 「C:\Users\lenovo\Anaconda3\envs\TF2.0\lib\site-packages\keras\engine\training_arrays.py」, line 205, in fit_loop if batch_index == len(batches) - 1: # Last batch. UnboundLocalError: loc

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