[scikit-learn] Incremental learning in scikit-learn

[Farzana Anowar]

Hello Sir/Madam,

I am going through the incremental learning algorithm in Scikit-learn. 
SGD in sci-kit learn is such a kind of algorithm that allows learning 
incrementally by passing chunks/batches. Now my question is: does 
sci-kit learn keeps all the batches for training data in memory? Or it 
keeps chunks/batches in memory up to a certain amount of size? Or it 
keeps only one chunk/batch while training in memory and removes the 
other trained chunks/batches after training? Does that mean it suffers 
from catastrophic forgetting?

Thanks!

-- 
Regards,

Farzana Anowar