Implementing Callbacks in TensorFlow using the MNIST Dataset

​My course is Introduction to TensorFlow for Artificial Intelligence, Machine Learning and Deep learning and I have trouble in week 2nd assignment I got zero grade while my answer is correct.

[code removed - moderator]

Please click my name and message your notebook as an attachment. Do include the expanded grader feedback in the message as well.

@Sudhakar_Tripathi
Notebook metadata is corrupt. Please refresh your workspace and try again.
See Refresh your Lab Workspace section here