Machine learning section incomplete

[physicsnerd]

The overview page is the only page with actual content - the pages for each specific type of machine learning algorithm are completely blank (not even a heading). Ideally, these pages would describe briefly how the algorithm works, in what situations that algorithm should be used, in what situations that algorithm should explicitly not be used, how to select any other parameters for the algorithm (e.g. k for k nearest neighbors), and how to judge the accuracy of the model's outputs.