Keras that does not support TensorFlow 2.0. We recommend using `tf.keras`, or alternatively, downgrading to TensorFlow 1.14

You should only have to change the imports at the top:

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

classifier = Sequential()
classifier.add(Dense(6, init = 'uniform', activation = 'relu', input_dim = 11))

TensorFlow 2.0+ is only compatible with Keras 2.3.0+, so if you wish to use Keras 2.2.5-, you'll need TensorFlow 1.15.0-. Alternatively, yes, you can do from tensorflow.keras import ..., but that will not use your keras package at all and you might as well uninstall it.

if you want to use tensorflow 2.0+ you must have keras 2.3+
try to upgrade your keras it works for me :

pip install -U keras

or you may specify the keras version to 2.3