plot_ Model error: pydot and graphviz are not installed

1, install pydot, graphviz Methods can be Reference resources The following blog post ：
https://blog.csdn.net/shangxiaqiusuo1/article/details/85283432

2, After installed , modify pydot A statement in ：
https://blog.csdn.net/HJXINKKL/article/details/89483033

2, Once installed , Check graphviz Is it installed well ：
https://blog.csdn.net/u014749291/article/details/54891087

import pydot
print(pydot.find_graphviz()) # Report errors ：pydot No,  find_graphviz(), Look at the  pydot.py, Not really. 
# after , stay pydot_ng Find 
import pydot_ng
print(pydot_ng.find_graphviz())
# return : None
# after , see   System variables path route ：C:\Program Files (x86)\Graphviz2.38\bin
# It is amended as follows ：C:\Program Files (x86)\Graphviz2.38\bin\
print(pydot_ng.find_graphviz())
# Return a dictionary {...}

# It's running tensorflow Official website code ：https://www.tensorflow.org/api_docs/python/tf/keras/utils/plot_model
# In the second use plot_model, No error reported