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Bay Area Search - Two Talks - Vamsi, Prathyusha, Jon, Ravi

  • Jan 22, 2014 · 6:30 PM

We will have two talks with four great speakers tonight!

Phrase Optimization in Query Rewrites


In this talk we will present our recent work that improved eBay search relevance  through phrase optimization in query rewrites. The focus will be on the following approaches:

Phrase Match: Requiring certain query terms to be treated as phrases as opposed to bag of words (e.g. apple tv, new balance, iphone 5) thereby reducing irrelevant matches.

Phrase Drop: Dropping certain phrases in context (e.g. for sale in the query used cars for sale, buy from buy schwinn road bike) and thereby increasing recall.

Speaker Bios

Vamsi Salaka is currently an applied researcher at eBay search sciences group. His research areas are in Text Mining, Machine Learning, and Information Retrieval. His current research projects at eBay include user intent modeling in, search spam reduction, multi round ranking. He obtained his PhD from Penn State in 2008.

Prathyusha Senthil Kumar works in the Search Science applied research group at eBay focusing on improving search experience through enhanced query rewrites. Prior to this, she received her Masters in Computer Science from the University of Texas at Austin. Her areas of interest include data mining, programming, machine learning, information retrieval (and cooking).

Overcoming Low Recall:  A survey of Query Reduction Techniques


User engagement drops significantly for search results pages with low recall.  Many users abandon the site when confronted with a low recall search page.  The reasons for generating low recall search pages include:  “over constrained” user queries or the inability of the search engine to understand the intent of the user query. This talk provides an overview of the various techniques that are explored both in academia and industry for combating this problem.  We provide an analysis of the techniques and explain why they are effective. We conclude the talk with a set of open problems in this area.

Speaker Bios

Jon Degenhardt works on relevance algorithms as a member of eBay's Search Science team. Prior to eBay, he was a member of Yahoo's web search relevance team. His areas of interests include information retrieval and search engine architecture. He holds an MS from Stanford University. 

Ravi Chandra Jammalamadaka works on query rewrite and relevance algorithms as a member of eBay's Search Science team.  His research interests include information retrieval, machine learning and data mining. He published more than 10 academic research papers in the areas of databases, data mining and data security. He was invited to be a program committee member for ICDE 2010, IEEE ISI 2010 and 2011.  He holds a PhD degree from University of California, Irvine. 


6:30 Eat & Greet

7:00 Talk - Great speakers, good food, free beer.

Event will be held at the eBay campus just off 17/880 @ Hamilton in the main Community building.  Look for lobby/flagpole.

Wifi: eBayGuest/BuyItNow!

I'm always looking for speakers.  Please suggest speakers or topics you would like to hear.


Join or login to comment.

  • Mark D.

    Useful, but not revelatory.

    1 · January 23, 2014

    • Thomas P.

      Mark, how can we get something more revelatory?

      January 25, 2014

  • Stoney V.

    Good presentation. Thank you :)

    January 23, 2014

  • Julie L

    Could you recommend any relevant papers that would be useful for background reading and/or reference?

    January 21, 2014

  • Thomas P.

    We do upload our talk video here Please subscribe to it!

    January 16, 2014

  • Ravikant D.


    January 14, 2014

  • Shibaji

    Hope you will upload the talk videos, if so please publish the pointer

    January 12, 2014

  • David

    Looking for conversation regarding a new startup search engine.

    January 1, 2014

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