Anaconda 更新后 Jupyter Notebook 内核死机
Jupyter Notebook dead Kernel after Anaconda update
我遇到了以下问题。更新 Anaconda 后，因为我在将 skimage.io 导入 Jupyter Notebook 中的项目时出错，出现了更大的错误 - Dead Kernel。现在我无法开始一个项目，因为 Jupyter 给出了以下错误：
Copy/paste this URL into your browser when you connect for the first time,
to login with a token:
http://localhost:8888/?
token=aaf85a5e18489792c87cce65d7a53a0263cd5c08cc7248b 6
[I 00:55:13.451 NotebookApp] Accepting one-time-token-authenticated
connection from ::1
[I 00:55:31.607 NotebookApp] Kernel started: 608d2190-59e6-4888-b09a-
e616f67bd5b4
Traceback (most recent call last):
ERROR:tornado.general:Uncaught exception in ZMQStream callback
Traceback (most recent call last):
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
callback(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-
packages\tornado\stack_context.py", line 276, in null_wrapper
return fn(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 283, in dispatcher
return self.dispatch_shell(stream, msg)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 233, in dispatch_shell
self.pre_handler_hook()
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 248, in pre_handler_hook
self.saved_sigint_handler = signal(SIGINT, default_int_handler)
File "C:\Program Files\Anaconda3\lib\signal.py", line 47, in signal
handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread File "C:\Program
Files\Anaconda3\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "C:\Program Files\Anaconda3\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel_launcher.py",
line 16, in <module>
app.launch_new_instance()
File "C:\Program Files\Anaconda3\lib\site-
packages\traitlets\config\application.py", line 658, in launch_instance
app.start()
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelapp.py",
line 477, in start
ioloop.IOLoop.instance().start()
File "C:\Program Files\Anaconda3\lib\site-
packages\tornado\platform\asyncio.py", line 112, in start
self.asyncio_loop.run_forever()
ERROR:tornado.general:Uncaught exception in zmqstream callback
Traceback (most recent call last):
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 450, in _handle_events
self._handle_recv()
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 480, in _handle_recv
self._run_callback(callback, msg)
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
callback(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-
packages\tornado\stack_context.py", line 276, in null_wrapper
return fn(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 283, in dispatcher
return self.dispatch_shell(stream, msg)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 233, in dispatch_shell
self.pre_handler_hook()
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 248, in pre_handler_hook
self.saved_sigint_handler = signal(SIGINT, default_int_handler)
File "C:\Program Files\Anaconda3\lib\signal.py", line 47, in signal
handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread File "C:\Program
Files\Anaconda3\lib\asyncio\base_events.py", line 409, in run_forever
在尝试了很多 "quick fixes" - 卸载和安装 Jupyter 包等之后，唯一的方法是从头开始卸载和安装 Anaconda。如果您不害怕从头开始安装所有软件包（在我的情况下没有必要），这个解决方案是最好的。
我认为这里的问题是因为tornado 版本不匹配。你应该降级到旧版本的龙卷风来解决这个问题。至少，这对我有用。这应该可以解决问题。
conda install tornado=4.5.3
使用 conda 全新 安装 jupyter notebook（5.6 版）需要以下软件包，因此 tornado 的工作版本是5.1.
ipykernel: 4.8.2-py36_0 conda-forge
ipywidgets: 7.4.0-py_0 conda-forge
jupyter: 1.0.0-py_1 conda-forge
jupyter_client: 5.2.3-py_1 conda-forge
jupyter_console: 5.2.0-py36_0 conda-forge
nbconvert: 5.3.1-py_1 conda-forge
notebook: 5.6.0-py36_0 conda-forge
qtconsole: 4.3.1-py36_0 conda-forge
terminado: 0.8.1-py36_0 conda-forge
tornado: 5.1-py36h470a237_1 conda-forge
widgetsnbextension: 3.4.0-py36_0 conda-forge
要解决这个问题，可以手动安装最新版本的 tornado:
conda install tornado --update
或从头开始重新安装 jupyter notebook：
conda uninstall jupyter tornado
conda install jupyter
我在使用Jupyter实验室时也遇到了问题，我用命令升级了版本。
pip install jupyterlab —upgrade
避免系统范围的安装
pip install jupyterlab —upgrade —user
升级 ipykernel 对我有用
conda upgrade ipykernel
尝试各种方案后，升级、降级各种依赖conda upgrade --all
为我工作。
conda 升级——对我来说都有效
仅
python -m ipykernel install --user
和
python3 -m ipykernel install --user
曾在这里工作。
对我来说，这个问题是 ipykernel 版本不匹配。我安装了 google-colab，这降低了我的 ipykernel 的等级。卸载 google-colab 并将 ipykernel 升级到最新版本后，问题就解决了。
pip uninstall google-colab
pip install --upgrade ipykernel
如果您在 Vscode、
中使用 Jupyter Notebook
卸载所有 conda 软件包
安装 Anaconda Clean 以删除 conda 包
conda install anaconda-clean
这将删除您所有的 conda 包
anaconda-clean --yes
然后在Vscode中卸载Jupyter扩展，关闭你当前的jupyter notebook选项卡，重新打开你的jupyter notebook文件，运行然后在pop-up里面重新安装jupyter Vscode.
这对我有用。
我遇到了以下问题。更新 Anaconda 后，因为我在将 skimage.io 导入 Jupyter Notebook 中的项目时出错，出现了更大的错误 - Dead Kernel。现在我无法开始一个项目，因为 Jupyter 给出了以下错误：
Copy/paste this URL into your browser when you connect for the first time,
to login with a token:
http://localhost:8888/?
token=aaf85a5e18489792c87cce65d7a53a0263cd5c08cc7248b 6
[I 00:55:13.451 NotebookApp] Accepting one-time-token-authenticated
connection from ::1
[I 00:55:31.607 NotebookApp] Kernel started: 608d2190-59e6-4888-b09a-
e616f67bd5b4
Traceback (most recent call last):
ERROR:tornado.general:Uncaught exception in ZMQStream callback
Traceback (most recent call last):
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
callback(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-
packages\tornado\stack_context.py", line 276, in null_wrapper
return fn(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 283, in dispatcher
return self.dispatch_shell(stream, msg)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 233, in dispatch_shell
self.pre_handler_hook()
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 248, in pre_handler_hook
self.saved_sigint_handler = signal(SIGINT, default_int_handler)
File "C:\Program Files\Anaconda3\lib\signal.py", line 47, in signal
handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread File "C:\Program
Files\Anaconda3\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "C:\Program Files\Anaconda3\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel_launcher.py",
line 16, in <module>
app.launch_new_instance()
File "C:\Program Files\Anaconda3\lib\site-
packages\traitlets\config\application.py", line 658, in launch_instance
app.start()
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelapp.py",
line 477, in start
ioloop.IOLoop.instance().start()
File "C:\Program Files\Anaconda3\lib\site-
packages\tornado\platform\asyncio.py", line 112, in start
self.asyncio_loop.run_forever()
ERROR:tornado.general:Uncaught exception in zmqstream callback
Traceback (most recent call last):
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 450, in _handle_events
self._handle_recv()
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 480, in _handle_recv
self._run_callback(callback, msg)
File "C:\Program Files\Anaconda3\lib\site-
packages\zmq\eventloop\zmqstream.py", line 432, in _run_callback
callback(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-
packages\tornado\stack_context.py", line 276, in null_wrapper
return fn(*args, **kwargs)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 283, in dispatcher
return self.dispatch_shell(stream, msg)
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 233, in dispatch_shell
self.pre_handler_hook()
File "C:\Program Files\Anaconda3\lib\site-packages\ipykernel\kernelbase.py",
line 248, in pre_handler_hook
self.saved_sigint_handler = signal(SIGINT, default_int_handler)
File "C:\Program Files\Anaconda3\lib\signal.py", line 47, in signal
handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread File "C:\Program
Files\Anaconda3\lib\asyncio\base_events.py", line 409, in run_forever
在尝试了很多 "quick fixes" - 卸载和安装 Jupyter 包等之后，唯一的方法是从头开始卸载和安装 Anaconda。如果您不害怕从头开始安装所有软件包（在我的情况下没有必要），这个解决方案是最好的。
我认为这里的问题是因为tornado 版本不匹配。你应该降级到旧版本的龙卷风来解决这个问题。至少，这对我有用。这应该可以解决问题。
conda install tornado=4.5.3
使用 conda 全新 安装 jupyter notebook（5.6 版）需要以下软件包，因此 tornado 的工作版本是5.1.
ipykernel: 4.8.2-py36_0 conda-forge
ipywidgets: 7.4.0-py_0 conda-forge
jupyter: 1.0.0-py_1 conda-forge
jupyter_client: 5.2.3-py_1 conda-forge
jupyter_console: 5.2.0-py36_0 conda-forge
nbconvert: 5.3.1-py_1 conda-forge
notebook: 5.6.0-py36_0 conda-forge
qtconsole: 4.3.1-py36_0 conda-forge
terminado: 0.8.1-py36_0 conda-forge
tornado: 5.1-py36h470a237_1 conda-forge
widgetsnbextension: 3.4.0-py36_0 conda-forge
要解决这个问题，可以手动安装最新版本的 tornado:
conda install tornado --update
或从头开始重新安装 jupyter notebook：
conda uninstall jupyter tornado
conda install jupyter
我在使用Jupyter实验室时也遇到了问题，我用命令升级了版本。
pip install jupyterlab —upgrade
避免系统范围的安装
pip install jupyterlab —upgrade —user
升级 ipykernel 对我有用
conda upgrade ipykernel
尝试各种方案后，升级、降级各种依赖conda upgrade --all
为我工作。
conda 升级——对我来说都有效
仅
python -m ipykernel install --user
和
python3 -m ipykernel install --user
曾在这里工作。
对我来说，这个问题是 ipykernel 版本不匹配。我安装了 google-colab，这降低了我的 ipykernel 的等级。卸载 google-colab 并将 ipykernel 升级到最新版本后，问题就解决了。
pip uninstall google-colab
pip install --upgrade ipykernel
如果您在 Vscode、
中使用 Jupyter Notebook卸载所有 conda 软件包
安装 Anaconda Clean 以删除 conda 包
conda install anaconda-clean
这将删除您所有的 conda 包
anaconda-clean --yes
然后在Vscode中卸载Jupyter扩展，关闭你当前的jupyter notebook选项卡，重新打开你的jupyter notebook文件，运行然后在pop-up里面重新安装jupyter Vscode.
这对我有用。