Hello Parker, I can tell you my experience.
I start to contribute to sklearn two month ago, and I start with code review, this way I can learn how sklearn is written and how is the workflow, read issue and try to solve them. Then, I make some PR. I can tell that the core devs are very friendly and help you always. Specially, I had more contact with Joel Nothman and Andreas Mueller (thanks guys). So, I hope this help you in some way =) Regards! Emmanuel
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