简单聚合：输入单个Series，输出只有一个元素的Series。 复杂聚合：输入多个Series，输出多行和多列。 复杂聚合需要自定义函数计算出我们想要的结果。

Portable Bluetooth speakers have become an easy default for listening away from your desk or living room. They’re the kind of tech you grab without thinking, whether you’re heading outside, cleaning ...

Best ergonomic keyboards for 2026 What to look for in an ergonomic keyboard How we tested ergonomic keyboards Other ergonomic keyboards we tested Ergonomic keyboard FAQs The Ergo K860 from Logitech ...

We recommend you to visit Previous Versions (v1.12.0) for PyTorch installation including torchaudio==0.12.0. Use the requirements.txt to install the rest of the ...