ndcg calculation & weighted matrix generation based on ndcg difference
fixes + ranking areas from pizza-dataset
bug fix (and test results became bad…)
«fix» gradient direction
split to one-query and many-queries realizations
One query (total pairwise optimization):
now using java 8 function interaface to generator  weights matrix
ndcg as static util class
rowMeans and colMeans as static util class
cv bugfix
another bug fix
rank weights
Merge branch 'YetiRank'
Merge branch 'master' into YetiRank
Merge branch 'YetiRank'