lightly more complicated but theoretically sound way.

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# Reduction to Binary Classification
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## One vs Rest
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## One vs One
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???
The slightly hacky way is using what's known as a reduction.
We're doing a reduction like in math: reducing one problem to another.
In this case we're reducing the problem of multi-class classification into
several instances of the binary classification problem.
And we already know how to deal with binary classificat