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

[lampahome]

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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