PERSPECTIVES AND ISSUES IN MACHINE LEARNING

 Issues in Machine Learning

The field of machine learning, and much of this book, is concerned with answering questions such as the following

• What algorithms exist for learning general target functions from specific training examples? In what settings will particular algorithms converge to the desired function, given sufficient training data? Which algorithms perform best for which types of problems and representations?
• How much training data is sufficient? What general bounds can be found to relate the confidence in learned hypotheses to the amount of training experience and the character of the learner's hypothesis space?
• When and how can prior knowledge held by the learner guide the process of generalizing from examples? Can prior knowledge be helpful even when it is only approximately correct?
• What is the best strategy for choosing a useful next training experience, and how does the choice of this strategy alter the complexity of the learning problem?
• What is the best way to reduce the learning task to one or more function approximation problems? Put another way, what specific functions should the system attempt to learn? Can this process itself be automated?
• How can the learner automatically alter its representation to improve its ability to represent and learn the target function?