In this paper, we propose an adaptive synthetic (ADASYN)
sampling approach to address this problem. ADASYN is
based on the idea of adaptively generating minority data
samples according to their distributions: more synthetic data
is generated for minority class samples that are harder to learn
compared to those minority samples that are easier to learn.
The ADASYN method can not only reduce the learning bias
introduced by the original imbalance data distribution, but can
also adaptively shift the decision boundary to focus on those
difficult to learn samples.