Learning Data Mining with Python

Chapter 2
While there is a lot of variance, the plot shows a decreasing trend as the number of
neighbors increases.
Preprocessing using pipelines
When taking measurements of real-world objects, we can often get features in
very different ranges. For instance, if we are measuring the qualities of an animal,
we might have several features, as follows:
• Number of legs: This is between the range of 0-8 for most animals, while
some have many more!
• Weight: This is between the range of only a few micrograms, all the way
to a blue whale with a weight of 190,000 kilograms!
• Number of hearts: This can be between zero to five, in the case of
the earthworm.
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