Spam filter - step 2

Create function compute_confusion_matrix() that will compute and return a confusion matrix based on real classes of emails, and on email classes predicted by a filter.

• In the article Binary Classification, find and understand the meaning of abbreviations TP, FP, TN, FN.
• Take a piece of paper and write down:
  • what these abbreviations mean for the spam filtering problem, and
  • what we need to know to be able to compute them.