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Eliminating stability hallucinations in llm-based tts models via attention guidance
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Eliminating stability hallucinations in llm-based tts models via attention guidance

#Text-to-Speech #Large Language Models #Stability hallucinations #Attention mechanism #Optimal Alignment Score #Viterbi algorithm #AI voice generation

📌 Key Takeaways

  • Researchers developed a method to fix stability issues in AI speech models
  • They introduced a new metric called Optimal Alignment Score (OAS)
  • The OAS uses the Viterbi algorithm to evaluate text-speech alignment
  • The approach focuses on improving the attention mechanism in LLM-based TTS systems

📖 Full Retelling

Researchers from an unspecified institution published a paper on arXiv on September 25, 2025, outlining a method to resolve stability hallucinations in Large Language Model-based Text-to-Speech systems, addressing issues such as repetitive or omitted speech that currently plague AI voice generation technologies. The paper, titled 'Eliminating stability hallucinations in llm-based tts models via attention guidance,' introduces a novel approach to improving the alignment between text tokens and speech tokens in LLMs. The researchers first analyzed the existing alignment mechanisms to understand why these stability issues occur, then developed a metric called the Optimal Alignment Score (OAS) that utilizes the Viterbi algorithm—a dynamic programming algorithm commonly used for speech recognition—to evaluate text-speech alignment quality. This innovative metric allows for more precise identification of misalignments that lead to hallucinations in AI-generated speech, potentially revolutionizing how text is converted to natural-sounding audio.

🏷️ Themes

Artificial Intelligence, Speech Technology, Research Methodology

📚 Related People & Topics

Attention (machine learning)

Attention (machine learning)

Machine learning technique

In machine learning, attention is a method that determines the importance of each component in a sequence relative to the other components in that sequence. In natural language processing, importance is represented by "soft" weights assigned to each word in a sentence. More generally, attention enco...

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Large language model

Type of machine learning model

A large language model (LLM) is a language model trained with self-supervised machine learning on a vast amount of text, designed for natural language processing tasks, especially language generation. The largest and most capable LLMs are generative pre-trained transformers (GPTs) that provide the c...

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Viterbi algorithm

Finds likely sequence of hidden states

The Viterbi algorithm is a dynamic programming algorithm that finds the most likely sequence of hidden events that would explain a sequence of observed events. The result of the algorithm is often called the Viterbi path. It is most commonly used with hidden Markov models (HMMs).

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Entity Intersection Graph

Connections for Attention (machine learning):

🌐 Functional programming 1 shared
🌐 Large language model 1 shared
🌐 List (abstract data type) 1 shared
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Original Source
arXiv:2509.19852v2 Announce Type: replace-cross Abstract: This paper focuses on resolving stability hallucinations (e.g., repetitive or omitted speech) in LLM-based Text-to-Speech (TTS) models by improving and leveraging the attention mechanism. First, we analyzed the alignment mechanism between text tokens and speech tokens in LLMs. We then proposed a metric termed the Optimal Alignment Score (OAS), which employs the Viterbi algorithm to evaluate text-speech alignment quality. Subsequently, OA
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Source

arxiv.org

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