The (oj – tj) term is the difference ... but weak approach for multi-class logistic regression is to use a technique called one-versus-all (OVA). Suppose you have three classes to predict. In OVA you ...

LightGBM is a sophisticated, open-source, tree-based system that was introduced in 2017. LightGBM can perform multi-class classification, binary classification (predict one of two possible values), ...