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Rishav Chakravarti

5 accepted papers

2026

Coverage, Not Averages: Semantic Stratification for Trustworthy Retrieval Evaluation

ICML 2026poster

Retrieval quality is the primary bottleneck for accuracy and robustness in retrieval-augmented generation (RAG). Current evaluation relies on heuristically constructed query sets, which introduce a hidden intrinsic bias. We formalize retrieval evaluation as a statistical estimation problem, showing …

Cited by 0SourceScholar
2022

Generation-Focused Table-Based Intermediate Pre-training for Free-Form Question Answering

AAAI 2022technical

Question answering over semi-structured tables has attracted significant attention in the NLP community. However, most of the existing work focus on questions that can be answered with short-form answer, i.e. the answer is often a table cell or aggregation of multiple cells. This can mismatch wit…

2021

Capturing Row and Column Semantics in Transformer Based Question Answering over Tables

NAACL 2021long

Transformer based architectures are recently used for the task of answering questions over tables. In order to improve the accuracy on this task, specialized pre-training techniques have been developed and applied on millions of open-domain web tables. In this paper, we propose two novel approaches…

2020

A Multilingual Reading Comprehension System for more than 100 Languages

COLING 2020system demonstrations

This paper presents M-GAAMA, a Multilingual Question Answering architecture and demo system. This is the first multilingual machine reading comprehension (MRC) demo which is able to answer questions in over 100 languages. M-GAAMA answers questions from a given passage in the same or different langua…

2020

Towards building a Robust Industry-scale Question Answering System

COLING 2020industry

Industry-scale NLP systems necessitate two features. 1. Robustness: “zero-shot transfer learning” (ZSTL) performance has to be commendable and 2. Efficiency: systems have to train efficiently and respond instantaneously. In this paper, we introduce the development of a production model called GAAMA…

Cited by 16SourcePDFScholar