数据来源于沪深交易所、公开资料等。券商ETF（512000）被动跟踪中证全指证券公司指数，该指数基日为2007.6.29，发布于2013.7.15。中证全指证券公司指数2021~2025年年度涨跌幅分别为-4.95%、-27.37%、3.04%、27.26%、2.54%。指数成份股构成根据该指数编制规则适时调整，其回测历史业绩不预示指数未来表现。
The Claude C Compiler illustrates the other side: it optimizes for passing tests, not for correctness. It hard-codes values to satisfy the test suite. It will not generalize. Property-based testing would likely catch this particular case, but the general problem remains: for any fixed testing strategy, a sufficiently adversarial system can overfit to it. A proof cannot be gamed. It covers all inputs by construction.
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“So how do you test for that? How do you ensure that’s happening? If we look at what’s happened in the last 10 years in the tech space, unfortunately we’ve seen a lot of accountability laundering—which is when companies can say, ‘Well, I don’t know. I mean, the algorithm did it.’”
У берегов популярного среди россиян курорта появились опасные медузы08:45