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Nachshon Cohen

6 accepted papers

2026

Knowing When to Quit: A Principled Framework for Dynamic Abstention in LLM Reasoning

ICML 2026poster

Large language models (LLMs) using chain-of-thought reasoning often waste substantial compute by producing long, incorrect responses. Abstention can mitigate this by withholding outputs unlikely to be correct. While most abstention methods decide to withhold outputs before or after generation, dynam…

Cited by 0SourceScholar
2025

ChaI-TeA: A Benchmark for Evaluating Autocompletion of Interactions with LLM-based Chatbots

NAACL 2025short

The rise of LLMs has deflected a growing portion of human-computer interactions towards LLM-based chatbots.The remarkable abilities of these models allow users to interact using long, diverse natural language text covering a wide range of topics and styles. Phrasing these messages is a time and effo…

2024

Extremely efficient online query encoding for dense retrieval

NAACL 2024findings

Existing dense retrieval systems utilize the same model architecture for encoding both the passages and the queries, even though queries are much shorter and simpler than passages. This leads to high latency of the query encoding, which is performed online and therefore might impact user experience.…

2024

Quality Matters: Evaluating Synthetic Data for Tool-Using LLMs

EMNLP 2024main

Training large language models (LLMs) for external tool usage is a rapidly expanding field, with recent research focusing on generating synthetic data to address the shortage of available data. However, the absence of systematic data quality checks poses complications for properly training and testi…

Cited by 1SourcePDFScholar
2022

SDR: Efficient Neural Re-ranking using Succinct Document Representation

ACL 2022long

BERT based ranking models have achieved superior performance on various information retrieval tasks. However, the large number of parameters and complex self-attention operations come at a significant latency overhead. To remedy this, recent works propose late-interaction architectures, which allow…

Cited by 12SourcePDFScholar
2021

WikiSum: Coherent Summarization Dataset for Efficient Human-Evaluation

ACL 2021short

Recent works made significant advances on summarization tasks, facilitated by summarization datasets. Several existing datasets have the form of coherent-paragraph summaries. However, these datasets were curated from academic documents that were written for experts, thus making the essential step of…