Fast-Forward Indexes v0.7.0

Encoders

• TransformerEncoder class has been made more modular to make extending it easier.
• TASBEncoder, ContrieverEncoder, and BGEEncoder classes have been added.
• Defaults for the model argument have been added to Transformer encoder classes.

Misc

• python-terrier dependency has been increased to 0.12.
• PyTerrier transformers now call pyterrier.model.add_ranks.