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Vikas Yadav

16 accepted papers

2026

DNR Bench: Benchmarking Over-Reasoning in Reasoning LLMs

AAAI 2026technical

Test-time scaling has significantly improved large language model (LLM) performance, enabling deeper reasoning to solve complex problems. However, this increased reasoning capability also leads to excessive token generation and unnecessary problem-solving attempts. We introduce "Don

Cited by 0SourcePDFScholar
2025

Auto-Cypher: Improving LLMs on Cypher generation via LLM-supervised generation-verification framework

NAACL 2025short

Graph databases like Neo4j are gaining popularity for handling complex, interconnected data, over traditional relational databases in modeling and querying relationships. While translating natural language into SQL queries is well-researched, generating Cypher queries for Neo4j remains relatively un…

Cited by 0SourcePDFScholar
2025

ConciseRL: Conciseness-Guided Reinforcement Learning for Efficient Reasoning Models

EMNLP 2025

Large language models excel at complex tasks by breaking down problems into structured reasoning steps. However, reasoning traces often extend beyond reaching a correct answer, causing wasted computation, reduced readability, and hallucinations. To address this, we introduce a novel hyperparameter-f

2025

CopySpec: Accelerating LLMs with Speculative Copy-and-Paste

EMNLP 2025

We introduce CopySpec, a simple yet effective technique to tackle the inefficiencies LLMs face when generating responses that closely resemble previous outputs or responses that can be verbatim extracted from context. CopySpec identifies repeated sequences in the model’s chat history or context and

2025

Do LLMs Know When to NOT Answer? Investigating Abstention Abilities of Large Language Models

COLING 2025main

Abstention Ability (AA) is a critical aspect of Large Language Model (LLM) reliability, referring to an LLM’s capability to withhold responses when uncertain or lacking a definitive answer, without compromising performance. Although previous studies have attempted to improve AA, they lack a standard…

Cited by 4SourcePDFScholar
2025

M2Lingual: Enhancing Multilingual, Multi-Turn Instruction Alignment in Large Language Models

NAACL 2025long

Collecting instruction fine-tuning (IFT) data is a resource and time intensive task especially in multilingual setting where finding proficient native speakers is challenging. Moreover, traditional data collection is prone to privacy risks, toxicity and lacks scalability. While, fully synthetic data…

2025

Prompting with Phonemes: Enhancing LLMs’ Multilinguality for Non-Latin Script Languages

NAACL 2025long

Multilingual LLMs have achieved remarkable benchmark performance, but we find they continue to underperform on non-Latin script languages across contemporary LLM families. This discrepancy arises from the fact that LLMs are pretrained with orthographic scripts, which are dominated by Latin character…

Cited by 0SourcePDFScholar
2025

Variable Layerwise Quantization: A Simple and Effective Approach to Quantize LLMs

ACL 2025finding

We present a simple meta quantization approach that quantizes different layers of a large language model (LLM) at different bit levels, and is independent of the underlying quantization technique. Specifically, we quantize the most important layers to higher bit precision and less important layers t…

2024

AlpaGasus: Training a Better Alpaca with Fewer Data

ICLR 2024poster

Large language models~(LLMs) strengthen instruction-following capability through instruction-finetuning (IFT) on supervised instruction/response data. However, widely used IFT datasets (e.g., Alpaca's 52k data) surprisingly contain many low-quality instances with incorrect or irrelevant responses, w…

2024

Backdooring Instruction-Tuned Large Language Models with Virtual Prompt Injection

NAACL 2024long

Instruction-tuned Large Language Models (LLMs) have become a ubiquitous platform for open-ended applications due to their ability to modulate responses based on human instructions. The widespread use of LLMs holds significant potential for shaping public perception, yet also risks being maliciously…

2024

Change Is the Only Constant: Dynamic LLM Slicing based on Layer Redundancy

EMNLP 2024finding

This paper introduces a novel model compression approach through dynamic layer-specific pruning in Large Language Models (LLMs), enhancing the traditional methodology established by SliceGPT. By transitioning from constant to dynamic slicing, our method leverages the newly proposed Layer Redundancy…

2024

Enhancing Alignment using Curriculum Learning & Ranked Preferences

EMNLP 2024finding

Direct Preference Optimization (DPO) is an effective technique that leverages pairwise preference data (one chosen and rejected response per prompt) to align LLMs to human preferences. In practice, multiple responses could exist for a given prompt with varying quality relative to each other. We prop…

Cited by 4SourcePDFScholar
2024

Explicit over Implict: Explicit Diversity Conditions for Effective Question Answer Generation

COLING 2024main

Question Answer Generation (QAG) is an effective data augmentation technique to improve the accuracy of question answering systems, especially in low-resource domains. While recent pretrained and large language model-based QAG methods have made substantial progress, they face the critical issue of r…

Cited by 2SourcePDFScholar
2022

Towards Robust Neural Retrieval with Source Domain Synthetic Pre-Finetuning

COLING 2022main

Research on neural IR has so far been focused primarily on standard supervised learning settings, where it outperforms traditional term matching baselines. Many practical use cases of such models, however, may involve previously unseen target domains. In this paper, we propose to improve the out-of-…

2021

If You Want to Go Far Go Together: Unsupervised Joint Candidate Evidence Retrieval for Multi-hop Question Answering

NAACL 2021long

Multi-hop reasoning requires aggregation and inference from multiple facts. To retrieve such facts, we propose a simple approach that retrieves and reranks set of evidence facts jointly. Our approach first generates unsupervised clusters of sentences as candidate evidence by accounting links between…