Question 1

What is Preferred Networks known for?

Accepted Answer

Japanese deep learning company that created Chainer and Optuna and develops the PLaMo Japanese language models and its own AI chips. Landmarks: Chainer: a flexible framework of neural networks (2015); Optuna: A Next-generation Hyperparameter Optimization Framework (2019); PLaMo 2 8B (2025).

Question 2

Who leads Preferred Networks?

Accepted Answer

Daisuke Okanohara, Co-Founder, Chief Executive Officer; Toru Nishikawa, Co-Founder, Chairman.

Question 3

What kind of organization is Preferred Networks?

Accepted Answer

Startup lab, founded in 2014, based in Tokyo.

Year	Contribution	Source
2015	Chainer: a flexible framework of neural networksgithub.com	github.com
2019	Optuna: A Next-generation Hyperparameter Optimization Frameworkarxiv.org	arxiv.org
2025	PLaMo 2 8Bhuggingface.co	huggingface.co

Person	Role	Source
Daisuke OkanoharaCo-Founder, Chief Executive Officerpreferred.jp	Co-Founder, Chief Executive Officer	preferred.jp
Toru NishikawaCo-Founder, Chairmanpreferred.jp	Co-Founder, Chairman	preferred.jp

Where	Link
Website	preferred.jp
Blog	tech.preferred.jp/en
GitHub	pfnet
Hugging Face	pfnet

Preferred Networks

Known for

Leaders

Links

Lab changes by email