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Machine-learning systems learn by finding patterns in enormous quantities of data, but first that data has to be sorted, labeled, and produced by people. ChatGPT got its startling fluency from thousands of humans hired by companies such as Scale AI and Surge AI to write examples of things a helpful chatbot assistant would say and to grade its best responses. A little over a year ago, concerns began to mount in the industry about a plateau in the technology’s progress. Training models based on this type of grading yielded chatbots that were very good at sounding smart but still too unreliable to be useful. The exception was software engineering, where the ability of models to automatically check whether bits of code worked — did the code compile, did it print HELLO WORLD — allowed them to trial-and-error their way to genuine competence.，更多细节参见谷歌
春秋假并非新概念。早在13年前，国办印发的《国民旅游休闲纲要（2013—2020年）》提出，地方政府可以探索安排中小学放春假或秋假。至今，全国范围内已有浙江、广东、四川、湖北和江苏等地推行春秋假。，详情可参考新闻
We have a value of type A and need to produce a value of type B. The only source of B values available is f. So again there is exactly one implementation: