Learners : Matchbox recommender : Command-line runners
Negative data generator
The concept of positive-only data and the need to generate negative data is explained in the corresponding data mapping section.
The negative data generator can be called by running “
Learner Recommender GenerateNegativeData”. It takes two input parameters - the existing positive-only data file name and the name of the file to store the output to. For example:
Learner Recommender GenerateNegativeData --input-data PositiveData.dat --output-data StarRatingData.dat
The input file, although containing only positive data, has to follow the guidelines for the runner’s data formatting. That is, it has to provide a rating descriptor, as well as a rating value. For example:
R,1,1 u2,i3,1 u2,i1,1 u1,i1,1 u3,i2,1 u4,i4,1
The corresponding output will be:
R,0,1 u2,i3,1 u2,i1,1 u2,i4,0 u2,i2,0 u1,i1,1 u1,i3,0 u3,i2,1 u3,i1,0 u4,i4,1 u4,i1,0
Data in this format can now be fed into the recommender for training.