Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Joint Learning of Social Groups, Individuals Action and Sub-group
  Activities in Videos   The state-of-the art solutions for human activity understanding from a video
stream formulate the task as a spatio-temporal problem which requires joint
localization of all individuals in the scene and classification of their
actions or group activity over time. Who is interacting with whom, e.g. not
everyone in a queue is interacting with each other, is often not predicted.
There are scenarios where people are best to be split into sub-groups, which we
call social groups, and each social group may be engaged in a different social
activity. In this paper, we solve the problem of simultaneously grouping people
by their social interactions, predicting their individual actions and the
social activity of each social group, which we call the social task. Our main
contributions are: i) we propose an end-to-end trainable framework for the
social task; ii) our proposed method also sets the state-of-the-art results on
two widely adopted benchmarks for the traditional group activity recognition
task (assuming individuals of the scene form a single group and predicting a
single group activity label for the scene); iii) we introduce new annotations
on an existing group activity dataset, re-purposing it for the social task.

20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat