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IPython Interactive Computing and Visualization Cookbook by Cyrille Rossant

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Learning to recognize handwritten digits with a K-nearest neighbors classifier

In this recipe, we will see how to recognize handwritten digits with a K-nearest neighbors (K-NN) classifier. This classifier is a simple but powerful model, well-adapted to complex, highly nonlinear datasets such as images. We will explain how it works later in this recipe.

How to do it...

  1. We import the modules:
    In [1]: import numpy as np
            import sklearn
            import sklearn.datasets as ds
            import sklearn.cross_validation as cv
            import sklearn.neighbors as nb
            import matplotlib.pyplot as plt
            %matplotlib inline
  2. Let's load the digits dataset, part of the datasets module of scikit-learn. This dataset contains handwritten digits that have been manually labeled:
    In [2]: digits = ds.load_digits() ...

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