The job offers a good salary so interested candidates please registration on

The job offers a good salary so interested candidates

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The job offers a good salary so, interested candidates please registration on the our site: Attention! Accept applications only on this and next week. Respectively submitted Personnel department COS 424/SML 302 Features and Kernels February 18, 2019 7 / 49
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Email spam classification Example Hey, I just saw that there’s a chess tournament this saturday 1/17 at Charter, maybe your son can play: register.php (payment/registration) contact [email protected], Miguel XXX $40 on site at 3:15 pm, maybe less online. I think I mentioned that Tom XXX started the chess club at Community Park. His email is [email protected] I hope the NYGC meeting is great. COS 424/SML 302 Features and Kernels February 18, 2019 8 / 49
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Bag-of-words representation On the Origin of Species. On the Origin of Species. Introduction. W HEN ON BOARD H.M.S. ‘B EAGLE ,’ as natu- ralist, I was much struck with certain facts in the distribution of the inhabit- ants of South America, and in the geological rela- tions of the present to the past inhabitants of that continent. These facts seemed to me to throw some light on the origin of species—that mystery of mys- teries, as it has been called by one of our greatest philosophers. On my return home, it occurred to me, in 1837, that something might perhaps be made out on this question by patiently accumulating and re- flecting on all sorts of facts which could possibly have any bearing on it. After five years’ work I allowed myself to speculate on the subject, and drew up some short notes; these I enlarged in 1844 into a sketch of the conclusions, which then seemed to me probable: from that period to the present day I have steadily species 1662 origin 352 evolution 0 future 33 modification 179 animals 362 imagine 26 extinct 171 exist 259 natural 524 complex 62 generation 108 selection 380 neutral 2 mutation 8 probability 166 COS 424/SML 302 Features and Kernels February 18, 2019 9 / 49
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Bag-of-words representation Bag-of-words representation is often modeled with a multinomial distribution. Why? Natural alternatives? One bag-of-words feature vector is < document word count > rolls of a die with < dictionary size > sides Choose the dictionary carefully Can add Dirichlet prior (Laplace smoothing) to avoid underflow with rare/new words COS 424/SML 302 Features and Kernels February 18, 2019 10 / 49
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Bag-of-words representation Bag-of-words representation of text eliminates: word order specific n-grams possibility of disambiguation COS 424/SML 302 Features and Kernels February 18, 2019 11 / 49
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More sophisticated text features? How can I improve upon bag-of-words? (depends on goal) Additional features of the document: author, length, references Punctuation, capitalization, italics, bold. Average: sentence length, word length, paragraph length.
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