pip install hmmlearn

以为直接可以

pip install hmmlearn

结果安装过程中报错：

Collecting scikit-learn>=0.16 (from hmmlearn)
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)",)': /simple/scikit-learn/
  Could not find a version that satisfies the requirement scikit-learn>=0.16 (from hmmlearn) (from versions: )
No matching distribution found for scikit-learn>=0.16 (from hmmlearn)

看了一下官网，给的是——

pip install -U --user hmmlearn

没毛病。
查了一下解决办法，让在https://www.lfd.uci.edu/~gohlke/pythonlibs/下载whl然后

pip install hmmlearn‑0.2.3‑cp38‑cp38‑win_amd64.whl

……折腾了一会发现是针对windows安装
换了清华的源

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple hmmlearn

总是中途卡壳
最后先把scikit-learn装了，分步装，终于成了。