Anconda download + add Tsinghua +tensorflow installation +no module named 'tensorflow' +kernelrestart: restart failed, kernel restart failed

Change the computer again , Download the configuration again

One 、aconda download

https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/

conda channel Mirror settings for （ Reference resources https://blog.csdn.net/weixin_39278265/article/details/84782550）
Show all channel

conda config --show channels

Two 、 Add available Tsinghua sources

conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/
conda config --set show_channel_urls yes

conda config --set show_channel_urls yes I mean from channel Displays when installing packages in channel Of url, In this way, you can know the installation source of the package .

（3） Input conda config --show channels Check whether the addition is successful .
According to the image source you added , Which did you add , Just show which .

3、 ... and 、tensorflow Installation

(1)win+r Input cmd, Check anaconda install ： stay cmd Input conda --version

（2） Detect the installed environment ：conda info --envs
If there is no new environment here , There is only one default anaconda Medium root Environmental Science .

（3） Create a new one python3.5 Environment ,tensorflow：conda create --name tensorflow python=3.6
The system will automatically choose to assign one python3.6.x Version of

（4） Check if the creation is successful ：conda info --envs

（5） Activate the new environment ：activate tensorflow
Be sure to enter tensorflow in , Otherwise, you will install it in other environments , Make it unusable .

（6） Inquire about tensorflow Version number of
conda search tensorflow

（7） Choose the version number you want to install .conda install tensorflaw= Version number
（ Such as ：conda install tensorflaw=2.0.0） And then go back , Wait for .

If the following error occurs after installation
Fatal Python error: Py_Initialize: can’t initialize sys standard streams LookupError: unknown encoding: 65001
You can enter it in the command window set PYTHONIOENCODING=UTF-8

4. testing tensorflow Is the installation successful
（1） open cmd, Activate the new environment （ Switch to tensorflow Environmental Science ）：activate tensorflow

（2） Get into python

（3） Then type in a tensorflow edition 1.5 Test code ： If the output results 3, Description has been successfully installed tensorflow.

import tensorflow as tf 
sess = tf.Session() 
a = tf.constant(1) 
b = tf.constant(2) 
print(sess.run(a+b)) 

tensorflow edition 2.0 Test code ：

import tensorflow as tf

# see tensorflow edition 
print(tf.__version__)

print('GPU', tf.test.is_gpu_available())

a = tf.constant(2.0)
b = tf.constant(4.0)
print(a + b)

Four 、 Problems and solutions

1、 Report errors ：No module named ‘tensorflow’

Reference resources ：https://blog.csdn.net/qq_40305998/article/details/105677341
windows Terminal can import tensorflow,jupyter Impossible solution


If not , There is a problem .

Input in the terminal ：

jupyter kernelspec list

Show what has been added kernel

Then input ：

conda install pip
conda install ipykernel

python -m ipykernel install --user --name tensorflow --display-name tensor

among ：
python -m ipykernel install --user --name “ Name of the environment ” --display-name “ Want to name Python name ”

Input again ：

jupyter kernelspec list

You can see one more kernel.

open jupyter notebook, You can see an additional one named tensor Of kernel.

newly build tensor Of notebook file , You can solve the problem

You can also use ：

jupyter kernelspec remove tensorflow

Delete the created kernel.

among

jupyter kernelspec remove <kernel_name>

Input again ：

jupyter kernelspec list

open jupyter, Created Python have been deleted .

2、Kernel does not exist

Reference resources https://blog.csdn.net/Julse/article/details/102555574

stay pycharm Of terminal In the end , For the first time to start jupyter notebook, success . Restart after interruption , function cell I couldn't find it kernels, The system reports an error as follows

(topvenv)..../feature190919>jupyter notebook
[I 11:11:59.261 NotebookApp] Serving notebooks from local directory: ..../feature190919
[I 11:11:59.261 NotebookApp] The Jupyter Notebook is running at:
[I 11:11:59.261 NotebookApp] http://localhost:8888/?token=...
[I 11:11:59.262 NotebookApp] or http://127.0.0.1:8888/?token=...
[I 11:11:59.262 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[W 11:15:08.362 NotebookApp] No session ID specified
[W 11:15:08.362 NotebookApp] 404 GET /api/kernels/96b59d42-d81e-471c-8ef9-63a61a963a16/channels (127.0.0.1): Kernel does not exist: 96b59d42-d81e-471c-8ef9-63a61a963a16
[W 11:15:08.369 NotebookApp] 404 GET /api/kernels/96b59d42-d81e-471c-8ef9-63a61a963a16/channels (127.0.0.1) 9.02ms referer=None
[I 11:21:39.267 NotebookApp] Interrupted...
[I 11:21:39.268 NotebookApp] Shutting down 0 kernels

Solution （ Failure ）：
To find the runtime Catalog , Empty it all , restart jupyter That's all right. （ Be careful APPData For hidden folders ）

The following is my analysis and solution to this error
I'll go straight to token This error is caused by the password filled in the parameter of

Observe the directory , One start jupyter notebook These three files are generated

Open in Notepad nbserver-2280.json file , Will find 123456 I didn't get into password Field , Instead, it was put into token Field . At this time in pycharm Click on the

At this time, you will be prompted to enter the password again

Enter the password and save it .

stay cmd Through the window pip install jupyter After successful installation , function jupyter notebook, Run code , Find the left side of the code In [ ] Turned into In [*], Found in cmd The error reported in the window is as follows ：

3、KernelRestarter: restart failed, Kernel restart failed

There is also a large section of error reporting on this , It probably means that you are constantly trying to restart the kernel , Reading newspapers is wrong , Mainly KernelRestarter: restart failed, Kernel restart failed

Solution （ success ）：

pip install --upgrade ipykernel

Upgrade it to run normally , Although it will remind you prompt-toolkit The version of should be in 1.0 To 2.0 Between , But it doesn't affect jupyter notebook Operation of , In the process of upgrading , The main updated module is prompt_toolkit, It seems that the version of this module is too low

Reference resources ：https://blog.csdn.net/weixin_40820983/article/details/102798873
Because you need to upgrade the version of some packages , use pip install --upgrade *** The command to update , However, it is impossible to uninstall ：

ERROR: Cannot uninstall ‘scikit-learn’. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

Some answered with

pip install --ignore-installed ipykernel 

But the old version is still , There will be other problems .

In fact, as long as you find it python Installation package in , Delete all files related to it .（ All files with this module in their names should be deleted ）

For example, in the folder ：anaconda\Lib\site-package

D:\Program\Anaconda\envs\tensorflow\Lib\site-packages

Reference resources ：https://blog.csdn.net/qq_45371443/article/details/119008541

conda install tensorflow-estimator==2.0.0

Then reinstall , success ！！！

pip install --ignore-installed ipykernel 

It worked