Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Delayed Feedback Modeling for the Entire Space Conversion Rate
  Prediction   Estimating post-click conversion rate (CVR) accurately is crucial in
E-commerce. However, CVR prediction usually suffers from three major challenges
in practice: i) data sparsity: compared with impressions, conversion samples
are often extremely scarce; ii) sample selection bias: conventional CVR models
are trained with clicked impressions while making inference on the entire space
of all impressions; iii) delayed feedback: many conversions can only be
observed after a relatively long and random delay since clicks happened,
resulting in many false negative labels during training. Previous studies
mainly focus on one or two issues while ignoring the others. In this paper, we
propose a novel neural network framework ESDF to tackle the above three
challenges simultaneously. Unlike existing methods, ESDF models the CVR
prediction from a perspective of entire space, and combines the advantage of
user sequential behavior pattern and the time delay factor. Specifically, ESDF
utilizes sequential behavior of user actions on the entire space with all
impressions to alleviate the sample selection bias problem. By sharing the
embedding parameters between CTR and CVR networks, data sparsity problem is
greatly relieved. Different from conventional delayed feedback methods, ESDF
does not make any special assumption about the delay distribution. We
discretize the delay time by day slot and model the probability based on
survival analysis with deep neural network, which is more practical and
suitable for industrial situations. Extensive experiments are conducted to
evaluate the effectiveness of our method. To the best of our knowledge, ESDF is
the first attempt to unitedly solve the above three challenges in CVR
prediction area.

6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int