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I'd call that Information Retrieval, not Machine Learning. Indexing documents doesn't "learn" any more than a file system storing files, and TF-IDF and BM25 are
by andor 11y ago
I'd call that Information Retrieval, not Machine Learning. Indexing documents doesn't "learn" any more than a file system storing files, and TF-IDF and BM25 are simply weighting functions.
But of course, it's an interesting topic. If you want to learn more, the first edition of the most widely used textbook is free:
http://www-nlp.stanford.edu/IR-book/ http://www-nlp.stanford.edu/IR-book/
- don_draper 11y agoAs more data is indexed the system "learns" what makes a relevant search based upon the words in each document. Though I agree the definition of learning in a machine learning context is kind of grey.
- amirouche 11y agoIt doesn't learn, it fully supervised and doesn't have feedback loop. I don't say it's not interesting, it's step forward compared to other articles in my collection [1][2][3] about the same subject allows to dive easily into the metrics and heuristics used in IR. [1] https://www.youtube.com/watch?v=gJwFHSeFg44 https://www.youtube.com/watch?v=gJwFHSeFg44 [2] http://aakashjapi.com/fuckin-search-engines-how-do-they-work/ http://aakashjapi.com/fuckin-search-engines-how-do-they-work... [3] https://class.coursera.org/nlp/lecture https://class.coursera.org/nlp/lecture
- eivarv 11y agoI don't know if the definition is really that grey. Tom Mitchell's popular definition (from his book "Machine Learning"), which is is even quoted in the opening of the Wikipedia article on Machine Learning, comes to mind: "A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T, as measured by P, improves with experience E" [1] [1]: Mitchell, T. (1997). Machine Learning, McGraw Hill. ISBN 0-07-042807-7, p.2. [2]: https://en.wikipedia.org/wiki/Machine_learning#Overview https://en.wikipedia.org/wiki/Machine_learning#Overview
- draker 11y agoNovice question: Is the "www-" just part of the given subdomain or is there something else that occurs using that syntax? "http://nlp.stanford.edu/IR-book/" http://nlp.stanford.edu/IR-book/" resolves to the same resource.
- quesera 11y agoNo magic. "www-nlp" and "www" are explicitly configured to point to the same IP address in the DNS. Then (in the simplest case) the responding webserver is configured to treat the two hostnames (and possibly others) as identical and serve the same files. So I guess there is magic. CNAMEs and virtual hosts and HTTP1.1.
- Sir_Cmpwn 11y agowww-nlp.stanford.edu is a CNAME that points to nlp.stanford.edu. Tip: use the `dig` tool to examine DNS records.
- ninjakeyboard 11y agoIsn't eg even linear regression considered to be machine learning? http://aimotion.blogspot.ca/2011/10/machine-learning-with-python-linear.html http://aimotion.blogspot.ca/2011/10/machine-learning-with-py...
- dang 11y agoOk, we took "Machine Learning: " out of the title.
- deleted 11y ago[deleted]