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Re:Ask HN: How does Gmail detect promotional emails? by noir-york on Wednesday May 20, 2015 @08:34PM (#9580318)
Almost certainly some statistical method - perhaps Bayesian.
Re:Ask HN: How does Gmail detect promotional emails? by sameid on Wednesday May 20, 2015 @10:52PM (#9580703)
Thanks for the reply, I assume that would require a large set of actionable data? I'll definetly start reading up on Bayesian Statistics.