Xintong Li

Hi, I'm Xintong Li (李昕同), a machine learning research engineer at Apple in Cupertino, working on machine translation and multilingual Apple Foundation Models.

I'm interested in building language models that make knowledge and intelligence more accessible across languages. I also work on reinforcement learning and LLM agents, with the goal of building systems that are more capable, useful, and give people more time for what matters.

Experience

Machine Learning Research Engineer · Apple

2025 – present

Multilingual Apple Foundation Models

Reinforcement learning, large-scale training, and data

Machine Learning Research Engineer · Apple

2022 – 2025

Machine Translation

Production machine translation model hillclimbing
Distributed data processing
Pipeline orchestration of end-to-end machine learning workflows

Shipped in Live Translation, the Translate app, and system-wide, Safari, and Siri translation.

Senior Research Scientist · Baidu Research

Nov 2021 – Jun 2022

Institute of Deep Learning. Advised by Prof. Liang Huang.

Postdoctoral Researcher · The Ohio State University

Nov 2019 – Oct 2021

Department of Linguistics. Advised by Prof. Michael White.

Research Intern · Tencent AI Lab

Jul 2017 – May 2019

NLP Group. Advised by Prof. Lemao Liu.

Ph.D., Electronic Engineering · The Chinese University of Hong Kong

Aug 2015 – Jul 2019

Robotics and Perception Laboratory. Advised by Prof. Max Q.-H. Meng.

Selected Publications

A³T: Alignment-Aware Acoustic and Text Pretraining for Speech Synthesis and Editing
He Bai, Renjie Zheng, Junkun Chen, Xintong Li, Mingbo Ma, Liang Huang
ICML 2022
PaddleSpeech: An Easy-to-Use All-in-One Speech Toolkit
Hui Zhang, Tian Yuan, Junkun Chen, Xintong Li, Renjie Zheng, et al.
NAACL 2022, Demo Track · Best Demo Award
Self-Training for Compositional Neural NLG in Task-Oriented Dialogue
Xintong Li, Symon Stevens-Guille, Aleksandre Maskharashvili, Michael White
INLG 2021
On the Word Alignment from Neural Machine Translation
Xintong Li, Guanlin Li, Lemao Liu, Max Q.-H. Meng, Shuming Shi
ACL 2019
Target Foresight Based Attention for Neural Machine Translation
Xintong Li, Lemao Liu, Zhaopeng Tu, Shuming Shi, Max Q.-H. Meng
NAACL 2018

Full list on Google Scholar, a subset in the ACL Anthology.