1.14

Added

• added additional input checks for non-normal inputs (NaNs, infinites) for features
• added additional input checks for non-normal inputs (NaNs, infinites) for interactions
• cross validation module with dataset splitting utilities

Changed

• LightFM model now raises a ValueError (instead of assertion) when the number of supplied
  features exceeds the number of estimated feature embeddings.
• Warn and delete downloaded file when Movielens download is corrputed. This happens in the wild
  cofuses users terribly.