[scikit-learn] Any way to pre-calculate number of cluster roughly?

[Jamie Bull]

A common rule of thumb is number of clusters = sqrt(number of items/2)
http://www.ijarcsms.com/docs/paper/volume1/issue6/V1I6-0015.pdf

On Wed, 26 Jun 2019 at 12:32, lampahome <pahome.chen at mirlab.org> wrote:

> I see many ways like elbow method, silhouette score, they all define the
> cluster number after clustering.
>
> Especially the elbow method, I need to monitor the relation with cluster
> number and find the elbow.
>
> But if the dataset is too huge to let me find the elbow and I don't even
> how many cluster number actually.
>
> Any way to pre-calculate number of cluster roughly?
>
> thx
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