# clm_61F34ECA2A52

subject: Preferred Networks (/record/preferred-networks.md)  
predicate: adopted  
value: PyTorch  
valid_from: 2019-12-05  
valid_to: null  
published: 2019-12-04  
recorded: 2026-11-14  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-11-15  
cite: AsOf. "Preferred Networks adopted: PyTorch", as of 2019-12-05. Claim clm_61F34ECA2A52, https://asof.is/claim/clm_61F34ECA2A52, accessed 2026-11-15. Source: https://www.preferred.jp/en/news/pr20191205.  
checked: 2026-11-15 · its source page states the value and the date, as read by an AI model  

> December 5, 2019, Tokyo Japan – Preferred Networks, Inc. (PFN, Head Office: Tokyo, President & CEO: Toru Nishikawa) today announced plans to incrementally transition its deep learning framework (a fundamental technology in research and development) from PFN’s Chainer™ to PyTorch.

What https://www.preferred.jp/en/news/pr20191205 says, word for word.

## Sources

- https://www.preferred.jp/en/news/pr20191205 (primary, Preferred Networks, published 2019-12-04)

---

AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.