Release Notes


LensKit 0.5.0 modifies the algorithm APIs to follow the SciKit design patterns instead of our previous custom patterns. Highlights of this change:

  • Algorithms are trained in-place — we no longer have distinct model objects.
  • Model data is stored as attributes on the algorithm object that end in _.
  • Instead of writing model = algo.train_model(ratings), call

We also have some new capabilities:

  • Ben Frederickson’s Implicit library


A number of improvements, including replacing Cython/OpenMP with Numba and adding ALS.


A lot of fixes to get ready for RecSys.


Hello, world!