I'm a bit confused as to why gridsearchCV is not needed with random forests. I 
understand that with RF, each tree will only get to see a partial 
representation of the data.

However, if I wanted to tune some parameters of the RF, wouldn't I still need 
to do gridsearch? If that is the case, does sklearn use the out of bag error to 
find the best classifier, or the score method?

Thank you,
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