Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graph-based Facial Affect Analysis: A Review   As one of the most important affective signals, facial affect analysis (FAA)
is essential for developing human-computer interaction systems. Early methods
focus on extracting appearance and geometry features associated with human
affects while ignoring the latent semantic information among individual facial
changes, leading to limited performance and generalization. Recent work
attempts to establish a graph-based representation to model these semantic
relationships and develop frameworks to leverage them for various FAA tasks.
This paper provides a comprehensive review of graph-based FAA, including the
evolution of algorithms and their applications. First, the FAA background
knowledge is introduced, especially on the role of the graph. We then discuss
approaches widely used for graph-based affective representation in literature
and show a trend towards graph construction. For the relational reasoning in
graph-based FAA, existing studies are categorized according to their non-deep
or deep learning methods, emphasizing the latest graph neural networks.
Performance comparisons of the state-of-the-art graph-based FAA methods are
also summarized. Finally, we discuss the challenges and potential directions.
As far as we know, this is the first survey of graph-based FAA methods. Our
findings can serve as a reference for future research in this field.

3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat