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Razvan-Gabriel Dumitru

4 accepted papers

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

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

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…