  The recently occurred representation learning make an attractive performance
in NLP and complex network, it is becoming a fundamental technology in machine
learning and data mining. How to use representation learning to improve the
performance of classifiers is a very significance research direction. We using
representation learning technology to map raw data(node of graph) to a
low-dimensional feature space. In this space, each raw data obtained a lower
dimensional vector representation, we do some simple linear operations for
those vectors to produce some virtual data, using those vectors and virtual
data to training multi-tag classifier. After that we measured the performance
of classifier by F1 score(Macro% F1 and Micro% F1). Our method make Macro F1
rise from 28 % - 450% and make average F1 score rise from 12 % - 224%. By
contrast, we trained the classifier directly with the lower dimensional vector,
and measured the performance of classifiers. We validate our algorithm on three
public data sets, we found that the virtual data helped the classifier greatly
improve the F1 score. Therefore, our algorithm is a effective way to improve
the performance of classifier. These result suggest that the virtual data
generated by simple linear operation, in representation space, still retains
the information of the raw data. It's also have great significance to the
learning of small sample data sets.
