Yahoo! Inc.

Srihari Venkatesan

Marcus Felipe Fontoura

Jayavel Shanmugasundaram

Erik Nathan Vee

Sergei Vassilvitskii

Jason Zien

Suhas Sadanandan

An item of inventory is described as a Boolean expression, which is converted into a multi-level, alternating AND/OR impression tree representation with leaf nodes representing conjuncts. Processing the conjuncts of the tree through a contract index results in retrieving a set of candidate contracts that match at least some but not necessarily all impression tree leaf node predicates. Next, an AND/OR contract tree representation is constructed with each contract tree leaf node having a label representing a projection onto a discrete set of ordered symbols. Contracts with projections that cover the entire range of discrete set of ordered symbols are deemed to satisfy the item of inventory. Implementation of the contract index includes retrieval techniques to support multi-valued predicates as well as confidence threshold functions using a multi-level tree representation of multi-valued predicates.

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Sunnyvale, CA, United States of America

Srihari Venkatesan