Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Real-Time Optimization Of Web Publisher RTB Revenues   This paper describes an engine to optimize web publisher revenues from
second-price auctions. These auctions are widely used to sell online ad spaces
in a mechanism called real-time bidding (RTB). Optimization within these
auctions is crucial for web publishers, because setting appropriate reserve
prices can significantly increase revenue. We consider a practical real-world
setting where the only available information before an auction occurs consists
of a user identifier and an ad placement identifier. The real-world challenges
we had to tackle consist mainly of tracking the dependencies on both the user
and placement in an highly non-stationary environment and of dealing with
censored bid observations. These challenges led us to make the following design
choices: (i) we adopted a relatively simple non-parametric regression model of
auction revenue based on an incremental time-weighted matrix factorization
which implicitly builds adaptive users' and placements' profiles; (ii) we
jointly used a non-parametric model to estimate the first and second bids'
distribution when they are censored, based on an on-line extension of the
Aalen's Additive model.
  Our engine is a component of a deployed system handling hundreds of web
publishers across the world, serving billions of ads a day to hundreds of
millions of visitors. The engine is able to predict, for each auction, an
optimal reserve price in approximately one millisecond and yields a significant
revenue increase for the web publishers.

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The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg