Tā tiāntiān tiáo cānshù xùnliàn móxíng, zìcháo shì zài liàndān.
He spends every day tweaking parameters and training models, and jokes that he is brewing elixirs.
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Daoist alchemists heated cinnabar, 丹砂, with other minerals in a furnace to make pills of immortality. The pills often contained mercury and lead, and several Tang emperors are believed to have died from taking them.
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Among AI engineers 炼丹 is a joke word for training a model: put in the ingredients, adjust the fire and hope something good comes out, without fully knowing why it works. The engineer becomes a 炼丹师, an alchemist.
