Here, the problem could be with the environment. This could be because the tensorflow module might have been installed in a different environment. Hence, you can resolve this by uninstalling the keras module and installing it back again. Below is the code that will help in installation and uninstallation.
$ pip uninstall keras
$ pip install keras
It is because your TensorFlow module might be installed in an environment that is different from the environment where Keras is installed in. Uninstall the Keras module and install it again.
$ pip uninstall keras
$ pip install keras
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