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Dingcheng Li

9 accepted papers

2025

Reinforcement Learning with Backtracking Feedback

NeurIPS 2025poster

Addressing the critical need for robust safety in Large Language Models (LLMs), particularly against adversarial attacks and in-distribution errors, we introduce Reinforcement Learning with Backtracking Feedback (RLBF). This framework advances upon prior methods, such as BSAFE, by primarily leveragi…

Cited by 0SourceScholar
2023

A Tale of Two Latent Flows: Learning Latent Space Normalizing Flow with Short-Run Langevin Flow for Approximate Inference

AAAI 2023technical

We study a normalizing flow in the latent space of a top-down generator model, in which the normalizing flow model plays the role of the informative prior model of the generator. We propose to jointly learn the latent space normalizing flow prior model and the top-down generator model by a Markov ch…

Cited by 6SourcePDFScholar
2022

LPC: A Logits and Parameter Calibration Framework for Continual Learning

EMNLP 2022finding

When we execute the typical fine-tuning paradigm on continuously sequential tasks, the model will suffer from the catastrophic forgetting problem (i.e., the model tends to adjust old parameters according to the new knowledge, which leads to the loss of previously acquired concepts). People proposed…

Cited by 9SourcePDFScholar
2022

Learning to Selectively Learn for Weakly Supervised Paraphrase Generation with Model-based Reinforcement Learning

NAACL 2022long

Paraphrase generation is an important language generation task attempting to interpret user intents and systematically generate new phrases of identical meanings to the given ones. However, the effectiveness of paraphrase generation is constrained by the access to the golden labeled data pairs where…

Cited by 6SourcePDFScholar
2022

Overcoming Catastrophic Forgetting During Domain Adaptation of Seq2seq Language Generation

NAACL 2022long

Seq2seq language generation models that are trained offline with multiple domains in a sequential fashion often suffer from catastrophic forgetting. Lifelong learning has been proposed to handle this problem. However, existing work such as experience replay or elastic weighted consolidation requires…

Cited by 56SourcePDFScholar
2022

PromptGen: Automatically Generate Prompts using Generative Models

NAACL 2022findings

Recently, prompt learning has received significant attention, where the downstream tasks are reformulated to the mask-filling task with the help of a textual prompt. The key point of prompt learning is finding the most appropriate prompt. This paper proposes a novel model PromptGen, which can automa…

Cited by 27SourcePDFScholar
2021

A Deep Decomposable Model for Disentangling Syntax and Semantics in Sentence Representation

EMNLP 2021finding

Recently, disentanglement based on a generative adversarial network or a variational autoencoder has significantly advanced the performance of diverse applications in CV and NLP domains. Nevertheless, those models still work on coarse levels in the disentanglement of closely related properties, such…

Cited by 7SourcePDFScholar
2021

Contextual Rephrase Detection for Reducing Friction in Dialogue Systems

EMNLP 2021main

For voice assistants like Alexa, Google Assistant, and Siri, correctly interpreting users’ intentions is of utmost importance. However, users sometimes experience friction with these assistants, caused by errors from different system components or user errors such as slips of the tongue. Users tend…

2021

Learning to Selectively Learn for Weakly-supervised Paraphrase Generation

EMNLP 2021main

Paraphrase generation is a longstanding NLP task that has diverse applications on downstream NLP tasks. However, the effectiveness of existing efforts predominantly relies on large amounts of golden labeled data. Though unsupervised endeavors have been proposed to alleviate this issue, they may fail…