Recall and Precision at K Examples

[wontonswaggie]

Create a usage example on how these ranking metrics can be used:

| Python API                                                 | Description                                                                   |
+============================================================+===============================================================================+
| `metriks.recall_at_k(y_true, y_prob, k)`                   | Calculates recall at k for binary classification ranking problems.            |
+------------------------------------------------------------+-------------------------------------------------------------------------------+
| `metriks.precision_at_k(y_true, y_prob, k)`                | Calculates precision at k for binary classification ranking problems.         |
+------------------------------------------------------------+-------------------------------------------------------------------------------+

1. Identify a dataset that can be used to train a ranking model
2. Train a ranking model with the data
3. Use the given metrics above and show results and demonstrate how these metrics can be used

[swathi-dinakaran]

Hi I am a gracehopper attendee and would like to know more about and work on this issue.