Class meeting for 10-605 Workflows For Hadoop

This is one of the class meetings on the schedule for the course Machine Learning with Large Datasets 10-605 in Fall_2016.

Slides

• Slides in Powerpoint, in PDF,

Quiz

• [https://qna-app.appspot.com/edit_new.html#/pages/view/aglzfnFuYS1hcHByGQsSDFF1ZXN0aW9uTGlzdBiAgICwmqv_Cww

Todays quiz]

Readings

• Pig: none required. A nice on-line resource for PIG is the on-line version of the O'Reilly Book Programming Pig.

Readings for the Class

• Introduction to Information Retrieval, by Christopher D. Manning, Prabhakar Raghavan & Hinrich Schütz, has a fairly self-contained chapter on the vector space model, including Rocchio's method.

Also discussed

• Joachims, Thorsten, A Probabilistic Analysis of the Rocchio Algorithm with TFIDF for Text Categorization. Proceedings of International Conference on Machine Learning (ICML), 1997.
• Relevance Feedback in Information Retrieval, SMART Retrieval System Experiments in Automatic Document Processing, 1971, Prentice Hall Inc.
• Schapire et al, Boosting and Rocchio applied to text filtering, SIGIR 98.

Things to Remember

• The TFIDF representation for documents.
• The Rocchio algorithm.
• Why Rocchio is easy to parallelize.

• Definition of a similarity join/soft join.
• Why inverted indices make TFIDF representations useful for similarity joins
  • e.g., whether high-IDF words have shorter or longer indices, and more or less impact in a similarity measure