CHAPTER Regular Expressions, Text Normalization, Edit …
2 CHAPTER 2•REGULAR EXPRESSIONS, TEXT NORMALIZATION, EDIT DISTANCE Some languages, like Japanese, don’t have spaces between words, so word tokeniza-tion becomes more difficult. lemmatization Another part of text normalization is lemmatization, the task of determining that two words have the same root, despite their surface differences.
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CHAPTER Logistic Regression - Stanford University
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CHAPTER Logistic Regression - Stanford University
www.web.stanford.edulearning. Machine learning classifiers require a training corpus of m input/output pairs (x(i);y(i)). (We’ll use superscripts in parentheses to refer to individual instances in the training set—for sentiment classification each instance might be an individual document to be classified.) A machine learning system for classification then ...
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CHAPTER Logistic Regression - Stanford University
www.web.stanford.edui for input x(j) as x(j) i, sometimes simplified as x i, but we will also see the notation f i, f i(x), or, for multiclass classification, f i(c;x). 2.A classification function that computes ˆy, the estimated class, via p(yjx). In the next section we will introduce the sigmoid and softmax tools for classifi-cation.