[barefeg]

Do you need to have the same number of positive and negatives? Is there any meaning of pairing a positive an a negative in the triplet?

[raphaelty]

It's because of the loss of the model. I ask the model to produce a higher similarity between the query and the positive document rather than between the query and the negative document. I'll add more losses soon so there are more choices

[alexmolas]

is the loss the usual lambdarank?