keras plot_model tells me to install pydot

The path(s) to the installed GraphViz executables (dot, neato, etc.) need to be in the PATH environment variable, in order for pydot to find them. pydot used to search for those executables in earlier versions, but not any more.

Also:

1. pydot is a Python package.
2. GraphViz is a collection of tools written in C for computing graph layouts
3. graphviz is a Python package entirely unrelated to pydot. These two Python packages do not interact in any way with each other. Installing one of them should suffice (together with GraphViz).

See also:

• https://github.com/erocarrera/pydot/issues/126
• https://github.com/erocarrera/pydot/commit/812e3c40dac1e0225391481073c64da5bafba93e#commitcomment-18236709
• https://github.com/erocarrera/pydot/commit/812e3c40dac1e0225391481073c64da5bafba93e#commitcomment-18222580

and links from there.

Complementing @Ioannis answer, you have to install GraphViz executables via conda (conda install GraphViz).

For my case, after installing GraphViz I tried with the latest pydot (pip install pydot) and the error was resolved.