Daniel De Freitas
Co-founder of Character.AI; led the development of the Meena and LaMDA dialog models at Google
Daniel De Freitas co-founded Character.AI with Noam Shazeer; the company's December 2022 launch post, signed by both, says De Freitas invented and led the development of the Meena and LaMDA dialog systems. De Freitas is a co-author of LaMDA: Language Models for Dialog Applications (2022), which presents Transformer-based language models specialized for dialog, with up to 137B parameters, and reports that fine-tuning with annotated data and letting the model consult external knowledge sources improve safety and factual grounding; a footnote on De Freitas's name says the work was done while at Google.12
Work
Meena and LaMDA (external site: arxiv.org)Published research
Character.AI's launch post says De Freitas invented and led the development of Meena and LaMDA; De Freitas is a co-author of the 2022 LaMDA paper, with a footnote saying the work was done while at Google.12
Character.AI (external site: blog.character.ai)Proprietary product
Co-founded Character.AI with Noam Shazeer; the December 2022 launch post introducing the company's product is signed by Shazeer, De Freitas and the Character team.1
Other documented roles
Roles the sources document but that are not confirmed as current.
- Co-founder (December 2022 launch post), Character.AI1
- Co-author of the LaMDA paper (work done while at Google, per the paper's footnote), Google21
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