In [2]:

```
# %load ../../preconfig.py
%matplotlib inline
import matplotlib.pyplot as plt
import seaborn as sns
plt.rcParams['axes.grid'] = False
#import numpy as np
#import pandas as pd
#import itertools
import logging
logger = logging.getLogger()
```

predict whether an email is junk email, or "spam".

classificaton problem.

predict the log of PSA from a number of measurements.

regression problem.

classification problem

cluster clues.

unsupervised learning problem.