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From Sean Owen <>
Subject Re: how idf is calculated
Date Fri, 31 Oct 2014 10:38:38 GMT
Yes, here the base doesn't matter as it just multiplies all results by
a constant factor. Math libraries tend to have ln, not log10 or log2.
ln is often the more, er, natural base for several computations. So I
would assume that log = ln in the context of ML.

On Fri, Oct 31, 2014 at 11:31 AM, Andrejs Abele <> wrote:
> I found my problem. I assumed based on TF-IDF in  Wikipedia , that log base
> 10 is used, but as I found in this discussion, in scala it is actually ln
> (natural logarithm).

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