Jure Leskovec, Stanford University - SNAP - Stanford University
Jure Leskovec, Stanford University - SNAP - Stanford University
Jure Leskovec, Stanford University - SNAP - Stanford University
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BALANCE Algorithm:<br />
For each query, pick the advertiser with the<br />
largest unspent budget<br />
Break ties arbitrarily (in a deterministic way)<br />
Two advertisers A and B<br />
A bids on query x, B bids on x and y<br />
Both have budgets of $4<br />
Query stream: xxxxyyyy<br />
BALANCE choice: ABABBB__<br />
Optimal: AAAABBBB, Competitive ratio = ¾<br />
Generally, competitive ratio = 1-1/e<br />
3/9/2011 <strong>Jure</strong> <strong>Leskovec</strong>, <strong>Stanford</strong> C246: Mining Massive Datasets 36