How to log Keras loss output to a file

Question

When you run a Keras neural network model you might see something like this in the console:

Epoch 1/3
   6/1000 [..............................] - ETA: 7994         


        

Answer 1

You can redirect the sys.stdout object to a file before the model.fit method and reassign it to the standard console after model.fit method as follows:

import sys
oldStdout = sys.stdout
file = open('logFile', 'w')
sys.stdout = file
model.fit(Xtrain, Ytrain)
sys.stdout = oldStdout