How to properly install a package when it is missing in jupyter

Background: Learning deep learning, using anaconda, creating a virtual environment, and encountered missing packages during learning

was trying to use

keras.utils.plot_model(model, "./lenet-5.png", show_shapes=True)

Then report an error

The problem was found and what measures were taken:

Tiankeng  -- the pip install I considered first

Soon, it will be installed, and these packages can also be found using pip list in jupyter

However, still reporting an error

(I found a problem that I used conda list and pip list to list at this time. There is no graphviz in conda list, but there is in pip)

After I tried to uninstall, I installed it directly in jupyter with pip (just add an exclamation point)

！pip install pydot
！pip install graphviz

Still not working, same pop-up error

I followed what other bloggers said, downloaded it from the graphviz official website, and then configured the environment. . .

But it's still the same error

Solution:

Configure the mirror source for conda (configuring the mirror source is still very important, otherwise the download fails or other problems)

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 --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/
cloud/pytorch/ conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/
conda config --set show_channel_urls yes
————————————————
then use conda install and wait

Noticed an interesting thing: 

I use pip install graphviz only about 70KB

My official website download graphviz has 4.5MB

I have 29.4MB with conda install graphviz

The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    graphviz-2.38              |       hfd603c8_2        29.3 MB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
    pydot-1.4.2                |   py39hcbf5309_1          43 KB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
    pyparsing-3.0.7            |     pyhd8ed1ab_0          79 KB  https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge
    ------------------------------------------------------------
                                           Total:        29.4 MB

The following NEW packages will be INSTALLED:

  graphviz           anaconda/pkgs/main/win-64::graphviz-2.38-hfd603c8_2
  pydot              anaconda/cloud/conda-forge/win-64::pydot-1.4.2-py39hcbf5309_1
  pyparsing          anaconda/cloud/conda-forge/noarch::pyparsing-3.0.7-pyhd8ed1ab_0

 I also encountered this problem when I lacked the seaborn package when I was studying before, and the solution is similar to
the original link: https://blog.csdn.net/TTritium/article/details/122587186

My personal suggestion is to use conda install first (but it must be equipped with a mirror source)