Not Sure About Further Or Higher, But Definitely Faster

See the GitHub milestone for full change list.

Infrastructure Updates

• Dropped support for Python 3.5
• Removed *args from Algorithm.fit, so additional data must be provided via keyword arguments
• Made Algorithm.fit implementations consistently take **kwargs for hybrid flexibility

Algorithm Updates

• Substantial performance and stability improvements to item-item
• Added a coordinate descent solver to explicit-feedback ALS and made it the default. The old
  LU-based solver is still available with method='lu'.
• Added a conjugate gradient solver to implicit-feedback ALS and made it the default.
• Added a random recommender