in 07_sparkml/experiment.py [0:0]
def get_category(hour):
if hour < 6 or hour > 20:
return [1, 0, 0] # night
if hour < 10:
return [0, 1, 0] # morning
if hour < 17:
return [0, 0, 1] # mid-day
else:
return [0, 0, 0] # evening