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Railsconf: Building a Mini-Google in Ruby – Ilya Grigorik

Ilya’s slides are already on the web.

A few random notes:

  • In 1994-1995 term frequency was state of the art in search engine relevancy.
  • State of the art today = TF-IDF = Term Frequency – Inverse Document Frequency
  • graph theory gem – gets slow after 1000 nodes but can manage about a million.
  • Working with math in Ruby is not the best idea. Use GSL with one of the ruby binding gems.
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