Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: IITD-DBAI: Multi-Stage Retrieval with Pseudo-Relevance Feedback and
  Query Reformulation   Resolving the contextual dependency is one of the most challenging tasks in
the Conversational system. Our submission to CAsT-2021 aimed to preserve the
key terms and the context in all subsequent turns and use classical Information
retrieval methods. It was aimed to pull as relevant documents as possible from
the corpus. We have participated in automatic track and submitted two runs in
the CAsT-2021. Our submission has produced a mean NDCG@3 performance better
than the median model.

29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga