简介：cognition, systems, decisions, visualization, machine learning, etc.

原站：http://anyall.org/blog

“AI and Social Science - Brendan O'Connor”的内容更新

累计：36 篇（自 2009-08-30 起）

更新：约1篇/月，最后更新136 天前

AI and Social Science - Brendan O'Connor

Be careful with dictionary-based text analysis

ok, everyone loves to run dictionary methods for sentiment and other text analysis — counting words from a predefined lexicon in a big corpus, in order to explore or test hypotheses about the corpus. in particular, this is often done for sentiment analysis: count positive and negative words (according to a sentiment polarity lexicon, which was derived f... (136 天前)

http://inezha.com/w/c4gw6nk

AI and Social Science - Brendan O'Connor

Information theory stuff

actually this post is mainly to test the mathjax installation i put into wordpress via this plugin. but information theory is great, why not?the probability of a symbol is \(p\).it takes \(\log \frac{1}{p} = -\log p\) bits to encode one symbol — sometimes called its “surprisal”. surprisal is 0 for a 100% probable symbol, and ranges up to \(\infty\)... (145 天前)

http://inezha.com/w/1lq5ln3

AI and Social Science - Brendan O'Connor

End-to-end NLP packages

what freely available end-to-end natural language processing (nlp) systems are out there, that start with raw text, and output parses and semantic structures? lots of nlp research focuses on single tasks at a time, and thus produces software that does a single task at a time. but for various applications, it is nicer to have a full end-to-end system that... (152 天前)

http://inezha.com/w/poov5nr

AI and Social Science - Brendan O'Connor

CMU Twitter Part-of-Speech tagger 0.2

announcement: we recently released a new version (0.2) of our part-of-speech tagger for english twitter messages, along with annotations and interface. see the link for more details.... (176 天前)

http://inezha.com/w/3ngnivb

AI and Social Science - Brendan O'Connor

one last thing on the norvig vs. chomsky thing from a little while ago (http://norvig.com/chomsky.html), which (correctly) casts the issue as shannon vs. chomsky.the relevant seminal publications are:shannon, “mathematical theory of communication,” 1948chomsky, “syntactic structures,” 1957one of those historical figures is still around and repr... (229 天前)

http://inezha.com/w/6uqo1vz

AI and Social Science - Brendan O'Connor

Good linguistic semantics textbook?

i’m looking for recommendations for a good textbook/handbook/reference on (non-formal) linguistic semantics. ?my undergrad semantics course was almost entirely focused on logical/formal semantics, which is fine, but i don’t feel familiar with the breadth of substantive issues — for example, i’d be hard-pressed to explain why something like semantic/t... (236 天前)

http://inezha.com/w/fxoy7vx

AI and Social Science - Brendan O'Connor

How much text versus metadata is in a tweet?

this should have been a blog post, but i got lazy and wrote a plaintext document instead.linkfor twitter, context matters: 90% of a tweet is metadata and 10% is text. ?that’s measured by (an approximation of) information content; by raw data size, it’s 95/5.... (244 天前)

http://inezha.com/w/a8g46v1

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