David AI, which sells audio data sets for AI training, raised a $50M Series B, sources say at a $500M valuation, up from ~$100M from its $25M Series A in May (Shirin Ghaffary/Bloomberg)

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Shirin Ghaffary / Bloomberg:David AI, which sells audio data sets for AI training, raised a $50M Series B, sources say at a $500M valuation, up from ~$100M from its $25M Series A in May  —  David AI Labs Inc. a startup selling audio data sets to help train artificial intelligence models, has raised $50 million …