id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
4b29b56616h	Troy William Raeder	Evaluating and Maintaining Classification Algorithms	2012		.txt	text/plain	214	9	41	That is to say, some measurement of the classifier's performance on past data is used as an estimate of its performance on future data. Additionally, misclassification costs are rarely known at model-selection time and the characteristics of the population from which data are drawn may change over time.	cache/4b29b56616h.txt	txt/4b29b56616h.txt