Adding the attend_to_expansion_tokens option #9
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In the original ColBERT implementation, the tokens added for query expansion are not attend in the attention layers (i.e, their corresponding attention mask is 0).
Hence, original tokens do not attend to them, but they are not statics either as they do attend to original tokens and also have different positional embeddings.
This PR add a property
attend_to_expansion_tokensto the ColBERT model to allow replication of the original models results and also explore whether or not it should be set be defaulted to true or false.