Data Science / Machine Learning Contests

To the data scientists and machine learning/AI enthusiasts out there, have you had any experience with Quantopian or QuantConnect or know someone who has? I'm specifically interested in the format of the contests on those sites; where people submit trading algorithms that are back tested and then scored on out-of-sample data. That competition model (testing ML algorithms against each other) might work well for the business model I'm currently working on.

I'm specifically looking for:

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Data Science / Machine Learning Contests

from Data Science / Machine Learning Contests