Definition of accuracy is in the article - but even more important is the value of accuracy in machine learning. read more
In this post, you learned about the Accuracy Paradox and problems with a class imbalance when Classification Accuracy alone cannot be trusted to select a well-performing model. Through example, you learned about the Confusion Matrix as a way of describing the breakdown of errors in predictions for an unseen dataset. read more
In information retrieval contexts, precision and recall are defined in terms of a set of retrieved documents (e.g. the list of documents produced by a web search engine for a query) and a set of relevant documents (e.g. the list of all documents on the internet that are relevant for a certain topic), cf. relevance. read more