AttributeError: module 'tensorflow' has no attribute 'contrib'

[Asaad-Pak]

I am trying to run the following part of the code.

generator.call = tf.contrib.eager.defun(generator.call)
discriminator.call = tf.contrib.eager.defun(discriminator.call)

discriminator_optimizer = tf.train.AdamOptimizer(1e-4)
generator_optimizer = tf.train.AdamOptimizer(1e-4)

I am using google collab and I am encountering the following error:

AttributeError Traceback (most recent call last)
in
----> 1 generator.call = tf.contrib.eager.defun(generator.call)
2 discriminator.call = tf.contrib.eager.defun(discriminator.call)
3
4 discriminator_optimizer = tf.train.AdamOptimizer(1e-4)
5 generator_optimizer = tf.train.AdamOptimizer(1e-4)

AttributeError: module 'tensorflow' has no attribute 'contrib'

How to resolve this?