If you use this code for your own experiments, please cite the following work:
Joel Mackenzie, Craig Macdonald, Falk Scholer and J. Shane Culpepper: On the Cost of Negation for Dynamic Pruning. In Proceedings of the 40th European Conference on Information Retrieval, ECIR, 2018.
This code is derived from the Quant-BM-Wand codebase, which, in turn, was derived from many others such as:
Please see each of these repo's for further information.
The licence is provided, see the LICENCE file.
Usage is similar to the original Quant-BM-Wand codebase. For our experiments, we utilised frequency indexes, but the code will still work with quantized postings.
Since we included the negation operator, we modified the parser to identify terms with the
negation operator -. Queries follow the same format as before, for example:
123;test query -negated
The excite query file we used for the experiments is also provided in the ir-repo/ directory in both
the .negated and .disjunctive formats. Note that these have been s-stemmed.