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Renjie Pi

36 accepted papers

2025

AlignGuard: Scalable Safety Alignment for Text-to-Image Generation

ICCV 2025poster

Text-to-image (T2I) models have become widespread, but their limited safety guardrails expose end users to harmful content and potentially allow for model misuse. Current safety measures are typically limited to text-based filtering or concept removal strategies, able to remove just a few concepts f…

Cited by 0SourcePDFScholar
2025

Bridge-Coder: Transferring Model Capabilities from High-Resource to Low-Resource Programming Language

ACL 2025finding

Most LLMs universally excel at generating code for high-resource programming languages (HRPLs) like Python, a capability that has become standard due to the abundance of training data. However, they struggle significantly with low-resource programming languages (LRPLs) such as D, exacerbating the di…

2025

ExeSQL: Self-Taught Text-to-SQL Models with Execution-Driven Bootstrapping for SQL Dialects

EMNLP 2025

Recent text-to-SQL models have achieved strong performance, but their effectiveness remains largely confined to SQLite due to dataset limitations. However, real-world applications require SQL generation across multiple dialects with varying syntax and specialized features, which remains a challenge

2025

Forewarned is Forearmed: Harnessing LLMs for Data Synthesis via Failure-induced Exploration

ICLR 2025poster

Large language models (LLMs) have significantly benefited from training on diverse, high-quality task-specific data, leading to impressive performance across a range of downstream applications. Current methods often rely on human-annotated data or predefined task templates to direct powerful LLMs in…

Cited by 0SourcePDFScholar
2025

G-LLaVA: Solving Geometric Problem with Multi-Modal Large Language Model

ICLR 2025poster

Large language models (LLMs) have shown remarkable proficiency in human-level reasoning and generation capabilities, which encourages extensive research on their application in mathematical problem solving. However, current work has been largely focused on text-based mathematical problems, with limi…

2025

MA-LoT: Model-Collaboration Lean-based Long Chain-of-Thought Reasoning enhances Formal Theorem Proving

ICML 2025poster

Solving mathematical problems using computer-verifiable languages like Lean has significantly impacted the mathematical and computer science communities. State-of-the-art methods utilize a single Large Language Model (LLM) to generate complete proof or perform tree search, but they fail to balance t…

Cited by 0SourcePDFScholar
2025

MR. Judge: Multimodal Reasoner as a Judge

EMNLP 2025

The paradigm of using Large Language Models (LLMs) and Multimodal Large Language Models (MLLMs) as evaluative judges has emerged as an effective approach in RLHF and inference-time scaling. In this work, we propose Multimodal Reasoner as a Judge (MR. Judge), a paradigm for empowering general-purpose

Cited by 0SourcePDFScholar
2025

Personalized Visual Instruction Tuning

ICLR 2025poster

Recent advancements in multimodal large language models (MLLMs) have demonstrated significant progress; however, these models exhibit a notable limitation, which we refer to as "face blindness." Specifically, they can engage in general conversations but fail to conduct personalized dialogues targeti…

2025

Pointing to a Llama and Call it a Camel: On the Sycophancy of Multimodal Large Language Models

EMNLP 2025

Multimodal large language models (MLLMs) have demonstrated extraordinary capabilities in conducting conversations based on image inputs. However, we observe that MLLMs exhibit a pronounced form of visual sycophantic behavior. While similar behavior has also been noted in text-based large language mo

2025

ScaleBiO: Scalable Bilevel Optimization for LLM Data Reweighting

ACL 2025long

Bilevel optimization has shown its utility across various machine learning settings, yet most algorithms in practice require second-order information, making it challenging to scale them up. Only recently, a paradigm of first-order algorithms has emerged in the theoretical literature, capable of eff…

2025

TAGCOS: Task-agnostic Gradient Clustered Coreset Selection for Instruction Tuning Data

NAACL 2025findings

Instruction tuning has achieved unprecedented success in NLP, turning large language models into versatile chatbots. However, the increasing variety and volume of instruction datasets demand significant computational resources. To address this, it is essential to extract a small and highly informati…

2025

VLM2-Bench: A Closer Look at How Well VLMs Implicitly Link Explicit Matching Visual Cues

ACL 2025long

Visually linking matching cues is a crucial ability in daily life, such as identifying the same person in multiple photos based on their cues, even without knowing who they are. Despite the extensive knowledge that vision-language models (VLMs) possess, it remains largely unexplored whether they are…

Cited by 0SourcePDFScholar
2025

VideoDPO: Omni-Preference Alignment for Video Diffusion Generation

CVPR 2025poster

Recent progress in generative diffusion models has greatly advanced text-to-video generation. While text-to-video models trained on large-scale, diverse datasets can produce varied outputs, these generations often deviate from user preferences, highlighting the need for preference alignment on pre-t…

2024

DetCLIPv3: Towards Versatile Generative Open-vocabulary Object Detection

CVPR 2024poster

Existing open-vocabulary object detectors typically require a predefined set of categories from users significantly confining their application scenarios. In this paper we introduce DetCLIPv3 a high-performing detector that excels not only at both open-vocabulary object detection but also generating…

Cited by 12SourcePDFScholar
2024

Efficient Denoising Diffusion via Probabilistic Masking

ICML 2024poster

Diffusion models have exhibited remarkable advancements in generating high-quality data. However, a critical drawback is their computationally intensive inference process, which requires a large number of timesteps to generate a single sample. Existing methods address this challenge by decoupling th…

Cited by 1SourcePDFScholar
2024

GradSafe: Detecting Jailbreak Prompts for LLMs via Safety-Critical Gradient Analysis

ACL 2024long

Large Language Models (LLMs) face threats from jailbreak prompts. Existing methods for detecting jailbreak prompts are primarily online moderation APIs or finetuned LLMs. These strategies, however, often require extensive and resource-intensive data collection and training processes. In this study,…

2024

Image Textualization: An Automatic Framework for Generating Rich and Detailed Image Descriptions

NeurIPS 2024poster

Image description datasets play a crucial role in the advancement of various applications such as image understanding, text-to-image generation, and text-image retrieval. Currently, image description datasets primarily originate from two sources. One source is the scraping of image-text pairs from t…

Cited by 0SourcePDFScholar
2024

Ins-DetCLIP: Aligning Detection Model to Follow Human-Language Instruction

ICLR 2024poster

This paper introduces Instruction-oriented Object Detection (IOD), a new task that enhances human-computer interaction by enabling object detectors to understand user instructions and locate relevant objects. Unlike traditional open-vocabulary object detection tasks that rely on users providing a li…

Cited by 3SourcePDFScholar
2024

LISA: Layerwise Importance Sampling for Memory-Efficient Large Language Model Fine-Tuning

NeurIPS 2024poster

The machine learning community has witnessed impressive advancements since large language models (LLMs) first appeared. Yet, their massive memory consumption has become a significant roadblock to large-scale training. For instance, a 7B model typically requires at least 60 GB of GPU memory with full…

2024

MLLM-Protector: Ensuring MLLM’s Safety without Hurting Performance

EMNLP 2024main

The deployment of multimodal large language models (MLLMs) has brought forth a unique vulnerability: susceptibility to malicious attacks through visual inputs. This paper investigates the novel challenge of defending MLLMs against such attacks. Compared to large language models (LLMs), MLLMs include…

2024

Mitigating the Alignment Tax of RLHF

EMNLP 2024main

LLMs acquire a wide range of abilities during pre-training, but aligning LLMs under Reinforcement Learning with Human Feedback (RLHF) can lead to forgetting pretrained abilities, which is also known as the alignment tax. To investigate alignment tax, we conducted experiments with existing RLHF algor…

2024

PerceptionGPT: Effectively Fusing Visual Perception into LLM

CVPR 2024highlight

The integration of visual inputs with large language models (LLMs) has led to remarkable advancements in multi-modal capabilities giving rise to vision large language models (VLLMs). However effectively harnessing LLMs for intricate visual perception tasks such as detection and segmentation remains…

Cited by 28SourcePDFScholar
2024

Plum: Prompt Learning using Metaheuristics

ACL 2024findings

Since the emergence of large language models, prompt learning has become a popular method for optimizing and customizing these models. Special prompts, such as Chain-of-Thought, have even revealed previously unknown reasoning capabilities within these models. However, the progress of discovering eff…

Cited by 13SourcePDFScholar
2024

SceMQA: A Scientific College Entrance Level Multimodal Question Answering Benchmark

ACL 2024short

The paper introduces SceMQA, a novel benchmark for scientific multimodal question answering at the college entrance level. It addresses a critical educational phase often overlooked in existing benchmarks, spanning high school to pre-college levels. SceMQA focuses on core science subjects including…

Cited by 5SourcePDFScholar
2024

The Instinctive Bias: Spurious Images lead to Illusion in MLLMs

EMNLP 2024main

Large language models (LLMs) have recently experienced remarkable progress, where the advent of multi-modal large language models (MLLMs) has endowed LLMs with visual capabilities, leading to impressive performances in various multi-modal tasks. However, those powerful MLLMs such as GPT-4V still fai…

2024

TheoremLlama: Transforming General-Purpose LLMs into Lean4 Experts

EMNLP 2024main

Proving mathematical theorems using computer-verifiable formal languages like Lean significantly impacts mathematical reasoning. One approach to formal theorem proving involves generating complete proofs using Large Language Models (LLMs) based on Natural Language (NL) proofs. However, due to the sc…

2023

A Holistic View of Label Noise Transition Matrix in Deep Learning and Beyond

ICLR 2023top-25%

In this paper, we explore learning statistically consistent classifiers under label noise by estimating the noise transition matrix T. We first provide a holistic view of existing T-estimation methods including those with or without anchor point assumptions. We unified them into the Minimum Geometr…

Cited by 14SourcePDFScholar
2023

DynaFed: Tackling Client Data Heterogeneity With Global Dynamics

CVPR 2023poster

The Federated Learning (FL) paradigm is known to face challenges under heterogeneous client data. Local training on non-iid distributed data results in deflected local optimum, which causes the client models drift further away from each other and degrades the aggregated global model's performance. A…

Cited by 30SourcePDFScholar
2023

Self-Guided Noise-Free Data Generation for Efficient Zero-Shot Learning

ICLR 2023top-25%

There is a rising interest in further exploring the zero-shot learning potential of large pre-trained language models (PLMs). A new paradigm called data-generation-based zero-shot learning has achieved impressive success. In this paradigm, the synthesized data from the PLM acts as the carrier of kno…

2022

Model Agnostic Sample Reweighting for Out-of-Distribution Learning

ICML 2022spotlight

Distributionally robust optimization (DRO) and invariant risk minimization (IRM) are two popular methods proposed to improve out-of-distribution (OOD) generalization performance of machine learning models. While effective for small models, it has been observed that these methods can be vulnerable to…

2022

Probabilistic Bilevel Coreset Selection

ICML 2022spotlight

The goal of coreset selection in supervised learning is to produce a weighted subset of data, so that training only on the subset achieves similar performance as training on the entire dataset. Existing methods achieved promising results in resource-constrained scenarios such as continual learning a…

Cited by 40SourcePDFScholar
2021

G-DetKD: Towards General Distillation Framework for Object Detectors via Contrastive and Semantic-Guided Feature Imitation

ICCV 2021poster

In this paper, we investigate the knowledge distillation (KD) strategy for object detection and propose an effective framework applicable to both homogeneous and heterogeneous student-teacher pairs. The conventional feature imitation paradigm introduces imitation masks to focus on informative foregr…

Cited by 31PDFScholar
2021

Joint-DetNAS: Upgrade Your Detector With NAS, Pruning and Dynamic Distillation

CVPR 2021poster

We propose Joint-DetNAS, a unified NAS framework for object detection, which integrates 3 key components: Neural Architecture Search, pruning, and Knowledge Distillation. Instead of naively pipelining these techniques, our Joint-DetNAS optimizes them jointly. The algorithm consists of two core proce…

Cited by 40PDFcodeScholar
2020

Bridging the Gap between Sample-based and One-shot Neural Architecture Search with BONAS

NeurIPS 2020poster

Neural Architecture Search (NAS) has shown great potentials in finding better neural network designs. Sample-based NAS is the most reliable approach which aims at exploring the search space and evaluating the most promising architectures. However, it is computationally very costly. As a remedy, the…