解决 Windows OSError - pydot failed to call GraphViz.Please install GraphViz 报错

import keras 
from keras.models import Model
from keras.layers import Input
from keras.layers import Conv2D
from keras.layers import GlobalAveragePooling2D
from keras.layers import Dense

import numpy as np

from keras.utils import plot_model

import os
os.environ["PATH"] += os.pathsep + r'E:\Program Files (x86)\Graphviz2.38\bin'


A = Input(shape=(16,16,3))
x = Conv2D(filters=10, kernel_size=(3,3), padding='same', activation='relu')(A)
x = Conv2D(filters=10, kernel_size=(3,3), padding='same', activation='relu')(x)
x = GlobalAveragePooling2D()(x)
x = Dense(units = 5, activation='softmax')(x)

model = Model(A,x)

model.summary()

test_input = np.random.rand(1,16,16,3)

results = model.predict(test_input)

plot_model(model)

builtins.OSError: `pydot` failed to call GraphViz.Please install GraphViz (https://www.graphviz.org/) and ensure that its executables are in the $PATH.

pip install pydot-ng 
pip install graphviz 
pip install pydot 

class Dot(Graph):
    """A container for handling a dot language file.

    This class implements methods to write and process
    a dot language file. It is a derived class of
    the base class 'Graph'.
    """

import platform
system = platform.system()
            
if system == 'Windows':
    self.prog = 'dot.exe'
else:
    self.prog = 'dot'