Answer by Ashar Siddiqui for Tensorflow: Cannot interpret feed_dict key as Tensor

In my case, I was using loop while calling in CNN multiple times, I fixed my problem by doing the following:

# Declare this as global:

global graph

graph = tf.get_default_graph()

# Then just before you call in your model, use this

with graph.as_default():

# call you models here

Note: In my case too, the app ran fine for the first time and then gave the error above. Using the above fix solved the problem.

Hope that helps.