Hi,

In CarmelTopKTermPruningPolicy class, the threshold is calculated as
follows: 

*float threshold =  docs[k - 1].score  - scoreDelta;*

docs[k - 1].score corresponds to z_t in the original paper (Carmel et al
2001) and  scoreDelta = epsilon * r 

Could you please explain me why it is calculated as "z_t - scoreDelta"?? I
am not able to find corresponding part in the paper. 

Thanks in advance
Best Regards,
ZP



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