Transfer learning: a friendly introduction

Journal of Big Data

Table 1 TL strategies and its settings

Learning strat-egytarget tasks	Related areas tasks	Clustering dimensionality reduction	Target domains	Source domain labels	Target domain labels	Source
Inductive TL	Multitask learning	The same	Available	Available	Different but related	Regression classification
	Self-taught learning	The same	Unavailable	Available	Different but related	Regression classification
Unsupervised TL		Different but related	Unavailable	Unavailable	Different but related	Clustering dimensionality reduction
Transductive TL	Domain adaptation, sample selection bias, Covariate shift	Different but related	Available	Unavailable	The same	Regression classification