Handwritten digits can be recognized with k-nearest neighbor algorithm.

Each handwritten digit is written on a 28*28 matrix. So there are 28*28 -> 784 pixels and each of these are represented as a single column of the dataset. Thus, the dataset has 785 columns. The first column is the label/digit and the remaining 784 values are the pixel values.

Following is a small example. Let's say, if we're to imagine this example as an 8 by 8 matrix, we would have something like the following figure for the digit 2:

A matrix can be represented as a 2-D array where each pixel is represented by each ...

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