UnboundLocalError: local variable 'batch_index' referenced before assignment

Question

This is NOT MY code by here is the line, where it shows a problem:

model.fit(trainX, trainY, batch_size=2, epochs=200, verbose=2)

(As I am thinking now, it i

Answer 1

The problem was resolved!

I had to import the correct libraries (Tensorflow and not Keras directly):

instead of importing directly Keras:

from tensorflow.python import keras.models.Sequential
from tensorflow.python import keras.layers.Dense

importing of only tensorflow works:

from tensorflow.python.keras.layers import Input, Dense
from tensorflow.python.keras.models import Sequential

Apparently this is related to the different version issue of Keras.