name 'BatchNormalization' is not defined

This error typically occurs when the BatchNormalization function is not imported or not defined in the current scope.

To resolve this issue, you should import the BatchNormalization function from the appropriate library. In TensorFlow, for example, you can import it from the keras.layers module as follows:

from keras.layers import BatchNormalization

Once you have imported the function, you can use it to normalize the input data in your neural network model.

Alternatively, you may encounter this error if you have a typo or other syntax error in your code that prevents Python from recognizing the BatchNormalization function. In this case, you should carefully review your code and correct any errors before attempting to use the function again.