How PolynomialExpansion works

[Nirav Patel <np...@xactlycorp.com>]

Doc says:

Take a 2-variable feature vector as an example: (x, y), if we want to
expand it with degree 2, then we get (x, x * x, y, x * y, y * y).

I know polynomial expansion of (x+y)^2 = x^2 + 2xy + y^2 but can't relate
it to above.

Thanks

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Re: How PolynomialExpansion works

[Sean Owen <so...@cloudera.com>]

The result includes, essentially, all the terms in (x+y) and (x+y)^2,
and so on up if you chose a higher power. It is not just the
second-degree terms.

On Fri, Sep 16, 2016 at 7:43 PM, Nirav Patel <np...@xactlycorp.com> wrote:
> Doc says:
>
> Take a 2-variable feature vector as an example: (x, y), if we want to expand
> it with degree 2, then we get (x, x * x, y, x * y, y * y).
>
> I know polynomial expansion of (x+y)^2 = x^2 + 2xy + y^2 but can't relate it
> to above.
>
> Thanks
>
>
>
>
>
>

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