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Jupyter实验室和笔记本问题:内核错误

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本文介绍了Jupyter实验室和笔记本问题:内核错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

看来我的内核之一被删除了.也许这就是为什么我会收到此错误.我该如何解决?我可以重新安装某些东西(也许是在基本环境中的内核)吗?

It appears that somehow one of my kernels is deleted. And perhaps that's why I am getting this error. How could I possibly fix it? Can I reinstall something (the kernel in the base environment perhaps)?

如果没有更好的选择，我将尝试根据以下方式完全重新安装anaconda:.

If no better option is available, I would try reinstalling anaconda altogether as a last resort according to: Default kernel in jupyter notebook (Python3) not working.

我尝试使用以下内容:

  1. 安装Jupyter Lab:requirements already satisfied
  2. 运行"jupyter实验室"时，内核不显示
  3. 当我明确拥有一个UI时，UI会说无内核"
  4. 在Python3中运行Jupyter Notebook时出现内核错误
  5. https://ipython.readthedocs.io/en/latest/install /kernel_install.html
  6. https://medium.com/flatiron-engineering /recovering-from-a-jupyter-disaster-27401677aeeb
  1. Installation of Jupyter Lab: requirements already satisfied
  2. Kernels don't show up when runnning "jupyter lab"
  3. UI says "No kernel" while I definitively have one
  4. Getting Kernel Error while running Jupyter Notebook in Python3
  5. https://ipython.readthedocs.io/en/latest/install/kernel_install.html
  6. https://medium.com/flatiron-engineering/recovering-from-a-jupyter-disaster-27401677aeeb

当前内核列表

jupyter kernelspec list

输出:

Available kernels:
  python3    C:\Users\raysu\AppData\Roaming\jupyter\kernels\python3
  vpython    C:\ProgramData\jupyter\kernels\vpython

但是我必须有另一个与我的基本环境相关联的内核(我想应该以某种方式删除了它).

But I must have another kernel (which I suppose somehow got deleted) associated with my base environment. 

C:\Users\raysu\Documents>conda env list
# conda environments:
#
base                  *  C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64
astra_env                C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\astra_env
bokeh_env                C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\bokeh_env
sound_env                C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\sound_env
tf_env                   C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\envs\tf_env
                         C:\Users\raysu\Anaconda3
                         C:\Users\raysu\Anaconda3\envs\pyforge
opencv_env               C:\Users\raysu\AppData\Local\conda\conda\envs\opencv_env
test_env                 C:\Users\raysu\AppData\Local\conda\conda\envs\test_env

错误

Traceback (most recent call last):
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\web.py", line 1699, in _execute
    result = await result
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\notebook\services\sessions\handlers.py", line 72, in post
    type=mtype))
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 88, in create_session
    kernel_id = yield self.start_kernel_for_session(session_id, path, name, type, kernel_name)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 742, in run
    yielded = self.gen.throw(*exc_info)  # type: ignore
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\notebook\services\sessions\sessionmanager.py", line 101, in start_kernel_for_session
    self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 735, in run
    value = future.result()
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\tornado\gen.py", line 209, in wrapper
    yielded = next(result)
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\site-packages\notebook\services\kernels\kernelmanager.py", line 168, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\multikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\manager.py", line 240, in start_kernel
    self.write_connection_file()
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\connect.py", line 476, in write_connection_file
    kernel_name=self.kernel_name
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_client\connect.py", line 141, in write_connection_file
    with secure_write(fname) as f:
  File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\lib\contextlib.py", line 81, in __enter__
    return next(self.gen)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_core\paths.py", line 404, in secure_write
    win32_restrict_file_to_user(fname)
  File "C:\Users\raysu\AppData\Roaming\Python\Python36\site-packages\jupyter_core\paths.py", line 359, in win32_restrict_file_to_user
    import win32api
ImportError: DLL load failed: The specified procedure could not be found.

推荐答案

详细解决方案

如前所述，我发现我有 2 kernelspecs. (命令:jupyter kernelspec list)

Solution in Detail

As reported earlier, I found that I had two kernelspecs. (command: jupyter kernelspec list)

  1. python3:C:\Users\raysu\AppData\Roaming\jupyter\kernels\python3
  2. vpython:C:\ProgramData\jupyter\kernels\vpython
  1. python3: C:\Users\raysu\AppData\Roaming\jupyter\kernels\python3
  2. vpython: C:\ProgramData\jupyter\kernels\vpython

kernelspec是一个.json文件，用于维护jupyter-notebook/lab启动特定内核的内核规范.幸运的是，内核 vpython 运行正常，这帮助我缩小了 kernelpsec: python3 内部问题的根源.我必须更正python可执行文件(python.exe)的路径，从而解决了该问题.

The kernelspec is a .json file that maintains kernel-specifications for jupyter-notebook/lab to launch a certain kernel. Fortunately, the kernel vpython was functioning and that helped me narrow down the source of the problem located inside kernelpsec: python3. I had to correct the path to the python executable (python.exe) and that solved the issue.

我想提一下，在这种情况下，以下两个资源非常有用.在看到kernelspec文档的典型结构之后，我对问题可能出在哪里有了更清晰的认识.

I would like to mention that in this case the following two resources came handy. I got more clarity in where the problem could be, after I saw the typical-structure of the kernelspec document.

注意:但是，由于我无法检验该理论，因此我会请遇到类似问题的其他人先复制旧的kernel.json文件，然后将路径更新为python.exe文件.如果这样可以解决 内核错误 ，则可能完全不需要重新安装Anaconda.

Note: However, since I cannot test this theory, I would ask anyone else in a similar problem, to first make a copy of the old kernel.json file and then update the path to python.exe file. If that resolves the kernel error, then reinstalling Anaconda altogether may not be necessary.

如果您的jupyter笔记本/实验室环境显示内核错误，则问题的根源很可能在kernelspec文件中: kernel.json 和 python.exe 不正确.如果即使重新安装了anaconda/jupyter-notebook/lab之后，同样的kernel error仍然存在，则可能是更可能的情况.

If your jupyter notebook/lab environment shows you kernel error, most likely the source of the problem is inside the kernelspec file: kernel.json and the path to python.exe is incorrect. This could be a more likely scenario, if the same kernel error persists even after fresh re-installation of anaconda/jupyter-notebook/lab.

例如，在我的情况下，python3-kernelspec位于:

For instance, in my case, the python3-kernelspec was located at: 

"C:\Users\raysu\AppData\Roaming\jupyter\kernels\python3"

python.exe位于:

"C:\Users\raysu\Anaconda3\python.exe"

但是， python-executable 的路径是错误的:它仍显示旧安装的路径.在安装anaconda之后，此路径已更改.因此，我不得不通过编辑kernel.json文件来更新python3的kernelspec.

However, the path to the python-executable was wrong: it was still showing the path from the old installation. And post-anaconda-reinstallation, this path had changed. So, I had to update the kernelspec for python3 by editing kernel.json file.

# kernel.json file
{
 "argv": [
  "C:\\Users\\raysu\\Anaconda3\\python.exe",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"
}

如果这不能解决您的问题，请查阅以下两个文档.因此，我浪费了4天.希望这个答案将来能对某人有所帮助.

If this does not solve your problem, please consult the following two documents. I wasted 4 days because of this. Hopefully, this answer would help out someone in future.

  1. https://jupyter-notebook.readthedocs.io/en/stable /troubleshooting.html
  2. https://jupyter-client.readthedocs.io/en/stable /kernels.html
  1. https://jupyter-notebook.readthedocs.io/en/stable/troubleshooting.html
  2. https://jupyter-client.readthedocs.io/en/stable/kernels.html

这篇关于Jupyter实验室和笔记本问题:内核错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

07-29 18:18
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