缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）
for RE# we use an approach similar to the lazy DFA in RE2, but with a twist - we skip the NFA entirely and construct the DFA directly from the regex using derivatives. this derivative-based lazy DFA construction technique comes from the .NET NonBacktracking engine (2023).
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So here’s the report we can make to Mr. Chesterton: for-profit scientific publishers arose to solve the problem of producing physical journals. The internet mostly solved that problem. Now the publishers are the problem. These days, Springer Nature, Elsevier, Wiley, and the like are basically giant operations that proofread, format, and store PDFs. That’s not nothing, but it’s pretty close to nothing.
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