How to fix ' module 'keras.backend.tensorflow_backend' has no attribute '_is_tf_1''

I fix this problem by replacing keras.XXX to tensorflow.keras.XXX

try replace

import keras.backend as K

to

import tensorflow.keras.backend as K

import -> import tensorflow as tf

then use tf.compat.v1.keras.backend. as prefix of your desired attribute

pip3 uninstall keras
pip3 install keras --upgrade

https://github.com/keras-team/keras/issues/13352