Enable implicit-feedback recommendation via one-class matrix factorization #1664
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test/Microsoft.ML.Tests/TrainerEstimators/MatrixFactorizationTests.cs
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This PR updates LIBMF used in ML.NET to the latest official master for adding a parallel coordinate descent method which solves one-class matrix factorization. It's a part of #1408 and the remaining tasks are OpenMP, SSE, and more formulations (current ML.NET treats LIBMF as a library for regression problem so that classification and ranking formulation are not allowed).