// Struct of Arrays — each field stored in its own contiguous array
without subtyping or field mutability are present in the，推荐阅读搜狗输入法获取更多信息
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Maximizing future choice. Joining a PhD program doesn’t close any doors or eliminate future employment/lifestyle options. You can go one way (PhD - anywhere else) but not the other (anywhere else - PhD - academia/research; it is statistically less likely). Additionally (although this might be quite specific to applied ML), you’re strictly more hirable as a PhD graduate or even as a PhD dropout and many companies might be willing to put you in a more interesting position or with a higher starting salary. More generally, maximizing choice for the future you is a good heuristic to follow.