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Alexander H. Liu

16 accepted papers

2025

Fugatto 1: Foundational Generative Audio Transformer Opus 1

ICLR 2025poster

Fugatto is a versatile audio synthesis and transformation model capable of following free-form text instructions with optional audio inputs. While large language models (LLMs) trained with text on a simple next-token prediction objective can learn to infer instructions directly from the data, models…

2025

Generative Speech Foundation Model Pretraining for High-Quality Speech Extraction and Restoration

ICASSP 2025accepted

This paper proposes a generative pretraining foundation model for high-quality speech restoration tasks. By directly operating on complex-valued short-time Fourier transform coefficients, our model does not rely on any vocoders for time-domain signal reconstruction. As a result, our model simplifies…

Cited by 0SourceScholar
2025

SHuBERT: Self-Supervised Sign Language Representation Learning via Multi-Stream Cluster Prediction

ACL 2025long

Sign language processing has traditionally relied on task-specific models, limiting the potential for transfer learning across tasks. Pre-training methods for sign language have typically focused on either supervised pre-training, which cannot take advantage of unlabeled data, or context-independent…

Cited by 0SourcePDFScholar
2025

UniWav: Towards Unified Pre-training for Speech Representation Learning and Generation

ICLR 2025poster

Pre-training and representation learning have been playing an increasingly important role in modern speech processing. Nevertheless, different applications have been relying on different foundation models, since predominant pre-training techniques are either designed for discriminative tasks or gen…

Cited by 0SourcePDFScholar
2024

Generative Pre-training for Speech with Flow Matching

ICLR 2024poster

Generative models have gained more and more attention in recent years for their remarkable success in tasks that required estimating and sampling data distribution to generate high-fidelity synthetic data. In speech, text-to-speech synthesis and neural vocoder are good examples where generative mode…

Cited by 34SourcePDFScholar
2024

Listen, Think, and Understand

ICLR 2024poster

The ability of artificial intelligence (AI) systems to perceive and comprehend audio signals is crucial for many applications. Although significant progress has been made in this area since the development of AudioSet, most existing models are designed to map audio inputs to pre-defined, discrete so…

2024

Revisiting Self-supervised Learning of Speech Representation from a Mutual Information Perspective

ICASSP 2024accepted

Existing studies on self-supervised speech representation learning have focused on developing new training methods and applying pre-trained models for different applications. However, the quality of these models is often measured by the performance of different downstream tasks. How well the represe…

Cited by 0SourceScholar
2023

Contrastive Audio-Visual Masked Autoencoder

ICLR 2023top-25%

In this paper, we first extend the recent Masked Auto-Encoder (MAE) model from a single modality to audio-visual multi-modalities. Subsequently, we propose the Contrastive Audio-Visual Masked Auto-Encoder (CAV-MAE) by combining contrastive learning and masked data modeling, two major self-supervised…

2023

DinoSR: Self-Distillation and Online Clustering for Self-supervised Speech Representation Learning

NeurIPS 2023poster

In this paper, we introduce self-distillation and online clustering for self-supervised speech representation learning (DinoSR) which combines masked language modeling, self-distillation, and online clustering. We show that these concepts complement each other and result in a strong representation l…

2022

On the Interplay between Sparsity, Naturalness, Intelligibility, and Prosody in Speech Synthesis

ICASSP 2022accepted

Are end-to-end text-to-speech (TTS) models over-parametrized? To what extent can these models be pruned, and what happens to their synthesis capabilities? This work serves as a starting point to explore pruning both spectrogram prediction networks and vocoders. We thoroughly investigate the tradeoff…

Cited by 0SourceScholar
2021

PARP: Prune, Adjust and Re-Prune for Self-Supervised Speech Recognition

NeurIPS 2021spotlight

Self-supervised speech representation learning (speech SSL) has demonstrated the benefit of scale in learning rich representations for Automatic Speech Recognition (ASR) with limited paired data, such as wav2vec 2.0. We investigate the existence of sparse subnetworks in pre-trained speech SSL models…

Cited by 80SourcePDFScholar
2020

Sequence-to-Sequence Automatic Speech Recognition with Word Embedding Regularization and Fused Decoding

ICASSP 2020accepted

In this paper, we investigate the benefit that off-the-shelf word embedding can bring to the sequence-to-sequence (seq-to-seq) automatic speech recognition (ASR). We first introduced the word embedding regularization by maximizing the cosine similarity between a transformed decoder feature and the t…

Cited by 0SourceScholar
2020

Towards Unsupervised Speech Recognition and Synthesis with Quantized Speech Representation Learning

ICASSP 2020accepted

In this paper we propose a Sequential Representation Quantization AutoEncoder (SeqRQ-AE) to learn from primarily unpaired audio data and produce sequences of representations very close to phoneme sequences of speech utterances. This is achieved by proper temporal segmentation to make the representat…

Cited by 0SourceScholar
2019

Adversarial Training of End-to-end Speech Recognition Using a Criticizing Language Model

ICASSP 2019accepted

In this paper we proposed a novel Adversarial Training (AT) approach for end-to-end speech recognition using a Criticizing Language Model (CLM). In this way the CLM and the automatic speech recognition (ASR) model can challenge and learn from each other iteratively to improve the performance. Since…

Cited by 0SourceScholar
2019

Towards Scene Understanding: Unsupervised Monocular Depth Estimation With Semantic-Aware Representation

CVPR 2019oral

Monocular depth estimation is a challenging task in scene understanding, with the goal to acquire the geometric properties of 3D space from 2D images. Due to the lack of RGB-depth image pairs, unsupervised learning methods aim at deriving depth information with alternative supervision such as stereo…

Cited by 287PDFScholar
2018

A Unified Feature Disentangler for Multi-Domain Image Translation and Manipulation

NeurIPS 2018poster

We present a novel and unified deep learning framework which is capable of learning domain-invariant representation from data across multiple domains. Realized by adversarial training with additional ability to exploit domain-specific information, the proposed network is able to perform continuous c…