[cloud-tensorflow-mnist]: Notebook return error on step 'Let's have a look at the data'

[vvillarreal-cfee]

The notebook returns an error when try to use the display_digits() because the parameter b of grid was deprecated in matplotlib 3.5, and renamed visible.

Reference: matplotlib/matplotlib#25267 (comment)

[vvillarreal-cfee]

To fix this, need to change the line:

plt.grid(b=None)

to:

plt.grid(visible=None)

inside the display_digits() function definition, on the keras_01_mnist.ipynb notebook.