Import matplotlib.pyplot as plt.
Select row 0 of samples and assign the result to digit. For example, to select column 2 of an array a, you could use a[:,2]. Remember that since samples is a NumPy array, you can't use the .loc[] or iloc[] accessors to select specific rows or columns.
Print digit. This has been done for you. Notice that it is a 1D array of 0s and 1s.
Use the .reshape() method of digit to get a 2D array with shape (13, 8). Assign the result to bitmap.
Print bitmap, and notice that the 1s show the digit 7!
Use the plt.imshow() function to display bitmap as an image.

Building recommender systems using NMF