Correlation Coefficients for Information Retrieval

Provides implementation of various correlation coefficients of common use in Information Retrieval. In particular, it includes Kendall (1970, isbn:0852641990) tau coefficient as well as tau_a and tau_b for the treatment of ties. It also includes Yilmaz et al. (2008) tauAP correlation coefficient, and versions tauAP_a and tauAP_b developed by Urbano and Marrero (2017) to cope with ties.