No module named 'ann_visualizer'

!pip3 install ann_visualizer
!pip install graphviz

from ann_visualizer.visualize import ann_viz  
ann_viz(classifier, view=True, title="test", filename="visualized")

#note: above 2 commands are mandatory if you are working on google colab
#after executing the code refresh the file system on colab 
#...you will find a pdf file there