[scikit-learn] Any way to tune threshold of Birch rather than GridSearchCV?

[lampahome]

I use Birch to cluster my data and my data is kind of time-series data.

I don't know the actually cluster numbers and need to read large
data(online learning), so I choose Birch rather than MiniKmeans.

When I read it, I found the critical parameters might be branching_factor
and threshold, and threshold will affect my cluster numbers obviously!

Any way to estimate the suitable threshold of Birch? Any paper suggestion
is ok.

thx
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