HOLDOUT Anglilicism by RESIST 1 . When a database is divided into two parts : one is the "train" set and the other is the "test" set. The training set is for use in what you are training and the test set is to measure it with unforeseen data. Some synonyms, words or similar expressions may be I worked 30 years in computing and never found the term holdout to differentiate the development test data and the process data
