Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Document classification methods   Information on different fields which are collected by users requires
appropriate management and organization to be structured in a standard way and
retrieved fast and more easily. Document classification is a conventional
method to separate text based on their subjects among scientific text, web
pages and digital library. Different methods and techniques are proposed for
document classifications that have advantages and deficiencies. In this paper,
several unsupervised and supervised document classification methods are studied
and compared.

26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc