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刚入门 pandas 的同学,对 DataFrame 也用了很久,但对 df[], df.loc[]df.iloc[] 的认识总是不够清晰,什么时候该用哪个,不能很好很简便的进行选择。

他们的区别主要在于:

df[] 是对单行或单列进行选取,也就是说只能单维度的选取,设置筛选条件时,也只能是对一个维度设置筛选条件。

df.loc[]df.iloc[] 则是对区域的选择,可以对两个维度设置筛选条件。

我们先创建一个 DataFrame。

df[] 行或列单维选取

设置外部可以访问,即非本地访问。

设置启动时不默认打开浏览器。

设置jupyter打开哪个文件夹。

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jupyter lab --no-browser --ip "*" \
--notebook-dir /burg/glab/users/luke

mamba install 需要指定渠道 -c pytorch

在 jupyter lab 中加载 pytorch 相关包时,控制台报错:

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OMP: Error #15: Initializing libiomp5md.dll, but found libiomp5md.dll already initialized.
OMP: Hint This means that multiple copies of the OpenMP runtime have been linked into the program. That is dangerous, since it can degrade performance or cause incorrect results. The best thing to do is to ensure that only a single OpenMP runtime is linked into the process, e.g. by avoiding static linking of the OpenMP runtime in any library. As an unsafe, unsupported, undocumented workaround you can set the environment variable KMP_DUPLICATE_LIB_OK=TRUE to allow the program to continue to execute, but that may cause crashes or silently produce incorrect results. For more information, please see http://www.intel.com/software/products/support/.

在虚拟环境下面的 \Library\bin 下面,找到 libiomp5md.dll 文件,改个名字就可以了。