Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of fraudulent users in P2P financial market   Financial fraud detection is one of the core technological assets of Fintech
companies. It saves tens of millions of money fro m Chinese Fintech companies
since the bad loan rate is more than 10%. HC Financial Service Group is the 3rd
largest company in the Chinese P2P financial market. In this paper we
illustrate how we tackle the fraud detection problem at HC Financial. We
utilize two powerful workhorses in the machine learning field - random forest
and gradient boosting decision tree to detect fraudulent users . We demonstrate
that by carefully select features and tune model parameters , we could
effectively filter out fraudulent users in the P2P market.

10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con