jupyter lab的全新conda安装无法连接到内核

Question

我正在尝试使用 miniconda 运行 jupyter lab，但 Jupyter 无法与内核连接。以下是一些背景信息、我已完成的步骤以及产生的代码。

背景资料

• 我已经成功使用 jupyter lab 几个月了。
• 直到今天才开始出现此问题。
  • 我怀疑这与我今天早上安装了XCode Command Line Tools 13有关，该工具昨天才发布，但是降级到12.5.1后出现了同样的问题。
• 我正在使用 miniconda。

步骤

• 创建一个全新的 conda 环境
• 用conda activate test激活它
• 然后我运行conda install jupyterlab
• 安装后，我运行jupyter lab 打开浏览器并导航到我的.ipynb

现在，浏览器的左下角写着“Python 3 (ipykernel) | Connecting”，并没有多说。以下是日志摘要：

常规日志输出

这是最初的信息（我不认为它包含任何新奇的东西，但可能有助于回答您可能有的一些我没有想到的问题）：

[I 2021-09-21 09:36:33.353 ServerApp] jupyterlab | extension was successfully linked.
[I 2021-09-21 09:36:34.278 ServerApp] nbclassic | extension was successfully linked.
[I 2021-09-21 09:36:34.509 LabApp] JupyterLab extension loaded from /opt/miniconda3/envs/test/lib/python3.9/site-packages/jupyterlab
[I 2021-09-21 09:36:34.509 LabApp] JupyterLab application directory is /opt/miniconda3/envs/test/share/jupyter/lab
[I 2021-09-21 09:36:34.515 ServerApp] jupyterlab | extension was successfully loaded.
[I 2021-09-21 09:36:34.526 ServerApp] nbclassic | extension was successfully loaded.
[I 2021-09-21 09:36:34.527 ServerApp] Serving notebooks from local directory: /Users/connorpancoast/Code/grassmaNN
[I 2021-09-21 09:36:34.527 ServerApp] Jupyter Server 1.4.1 is running at:
[I 2021-09-21 09:36:34.527 ServerApp] http://localhost:8888/lab?token=fa21e773398a0c8bbeccdb7a67ffb20950bac831209b9373
[I 2021-09-21 09:36:34.527 ServerApp]  or http://127.0.0.1:8888/lab?token=fa21e773398a0c8bbeccdb7a67ffb20950bac831209b9373
[I 2021-09-21 09:36:34.527 ServerApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 2021-09-21 09:36:34.535 ServerApp]

    To access the server, open this file in a browser:
        file:///Users/connorpancoast/Library/Jupyter/runtime/jpserver-24903-open.html
    Or copy and paste one of these URLs:
        http://localhost:8888/lab?token=fa21e773398a0c8bbeccdb7a67ffb20950bac831209b9373
     or http://127.0.0.1:8888/lab?token=fa21e773398a0c8bbeccdb7a67ffb20950bac831209b9373

之后事情就变得奇怪了。

奇怪的日志输出

首先是关于nodejs 的警告，它可能重要也可能不重要。

[W 2021-09-21 09:36:39.621 LabApp] Could not determine jupyterlab build status without nodejs
/opt/miniconda3/envs/test/lib/python3.9/json/encoder.py:257: UserWarning: date_default is deprecated since jupyter_client 7.0.0. Use jupyter_client.jsonutil.json_default.
  return _iterencode(o, 0)

接下来，内核启动，但连接超时。

[I 2021-09-21 09:36:51.114 ServerApp] Kernel started: b38270f5-9a72-42cf-86e5-0e8e4b3b9514
[W 2021-09-21 09:37:51.549 ServerApp] Timeout waiting for kernel_info reply from b38270f5-9a72-42cf-86e5-0e8e4b3b9514
[W 2021-09-21 09:37:56.092 ServerApp] Nudge: attempt 10 on kernel b38270f5-9a72-42cf-86e5-0e8e4b3b9514
[W 2021-09-21 09:37:56.093 ServerApp] Nudge: attempt 10 on kernel b38270f5-9a72-42cf-86e5-0e8e4b3b9514
[W 2021-09-21 09:37:56.109 ServerApp] Nudge: attempt 10 on kernel b38270f5-9a72-42cf-86e5-0e8e4b3b9514

我不确定为什么会发生三个单独的“轻推过程”，但在 120 次轻推尝试（如图所示）之后，此错误消息也出现了 3 次，未显示空格：

[W 2021-09-21 09:38:51.474 ServerApp] Nudge: attempt 120 on kernel b38270f5-9a72-42cf-86e5-0e8e4b3b9514
[W 2021-09-21 09:38:51.475 ServerApp] Nudge: attempt 120 on kernel b38270f5-9a72-42cf-86e5-0e8e4b3b9514
[W 2021-09-21 09:38:51.476 ServerApp] Nudge: attempt 120 on kernel b38270f5-9a72-42cf-86e5-0e8e4b3b9514
[E 2021-09-21 09:38:51.558 ServerApp] Uncaught exception GET /api/kernels/b38270f5-9a72-42cf-86e5-0e8e4b3b9514/channels?session_id=f834b0b3-b8ed-4b2d-bfc9-7a535593a24f (::1)
    HTTPServerRequest(protocol='http', host='localhost:8888', method='GET', uri='/api/kernels/b38270f5-9a72-42cf-86e5-0e8e4b3b9514/channels?session_id=f834b0b3-b8ed-4b2d-bfc9-7a535593a24f', version='HTTP/1.1', remote_ip='::1')
    Traceback (most recent call last):
      File "/opt/miniconda3/envs/test/lib/python3.9/site-packages/tornado/websocket.py", line 956, in _accept_connection
        await open_result
    tornado.util.TimeoutError: Timeout

在这些之后，出现：

[W 2021-09-21 09:39:21.571 ServerApp] WebSocket ping timeout after 90003 ms.
[W 2021-09-21 09:39:21.585 ServerApp] WebSocket ping timeout after 90003 ms.
[W 2021-09-21 09:42:51.594 ServerApp] Replacing stale connection: b38270f5-9a72-42cf-86e5-0e8e4b3b9514:ee46fa70-0af0-489d-8993-acf4f55bf3aa
[W 2021-09-21 09:42:52.123 ServerApp] Replacing stale connection: b38270f5-9a72-42cf-86e5-0e8e4b3b9514:ee46fa70-0af0-489d-8993-acf4f55bf3aa
/opt/miniconda3/envs/test/lib/python3.9/json/encoder.py:257: UserWarning: date_default is deprecated since jupyter_client 7.0.0. Use jupyter_client.jsonutil.json_default.
  return _iterencode(o, 0)
[I 2021-09-21 09:46:52.126 ServerApp] Starting buffering for b38270f5-9a72-42cf-86e5-0e8e4b3b9514:ee46fa70-0af0-489d-8993-acf4f55bf3aa
[W 2021-09-21 09:46:52.146 ServerApp] Replacing stale connection: b38270f5-9a72-42cf-86e5-0e8e4b3b9514:f834b0b3-b8ed-4b2d-bfc9-7a535593a24f
[W 2021-09-21 09:46:55.306 ServerApp] Replacing stale connection: b38270f5-9a72-42cf-86e5-0e8e4b3b9514:1db7c82b-2627-4c43-b9d3-da7bef15ca32

Answer 1

我还将 Jupyter Lab 与 Miniconda 一起使用，这就是我几天前所做的。

看来您需要安装 node.js 和 ipykernel：

conda install nodej ipykernel

另外，我在某处读到您需要“告诉”Jupyter Lab 使用您的环境，如下所示：

python -m ipykernel install --user --name test --display-name “enviroment_test”

请注意，test 是您的环境名称，“enviroment_test” 是它将在 Jupyter 中显示的名称。

最后，我建议从 conda-forge 安装 Jupyter：

conda install jupyterlab -c conda-forge

Obs.：所有这些都需要在您想要的环境被激活的情况下完成