{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture8-evaluation-handout-6-per

Probably the evaluaon methodology that large search

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: que of pure relevance Can we avoid human judgment?   Relevance vs Marginal Relevance Sec. 8.6.3   No   Makes experimental work hard         A document can be redundant even if it is highly relevant Duplicates The same informa)on from different sources Marginal relevance is a beUer measure of u)lity for the user.   Especially on a large scale   In some very specific seZngs, can use proxies   Using facts/en))es as evalua)on units more directly measures true relevance.   But harder to create evalua)on set   See Carbonell reference 35   E.g.: for approximate vector space retrieval, we can compare the cosine distance closeness of the closest docs to those found by an approximate retrieval algorithm   But once we have test collec)ons, we can reuse them (so long as we don’t overtrain too badly) 36 6 Introduc)on to Informa)on Retrieval Sec. 8.6.3 Introduc)on to Informa)on Retrieval Evalua)on at large search engines A/B tes)ng   Search engines have test collec)ons of queries and hand ­ranked results   Recall is difficult to measure on the web   Search engines o|en use precision at top k, e.g., k = 10   . . . or measures that reward you more for geZng rank 1 right than for geZng...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern