Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GPflow: A Gaussian process library using TensorFlow   GPflow is a Gaussian process library that uses TensorFlow for its core
computations and Python for its front end. The distinguishing features of
GPflow are that it uses variational inference as the primary approximation
method, provides concise code through the use of automatic differentiation, has
been engineered with a particular emphasis on software testing and is able to
exploit GPU hardware.

4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin