Home page https://gmic.eu/download.html
Link to source stable https://gmic.eu/files/source/gmic_3.2.6.tar.gz
(which I believe is the sum of https://github.com/GreycLab/gmic + https://github.com/c-koi/gmic-qt)
Because
denoise don't work:

$ gmic input_cached gmic_denoise_cnn.gmz
[gmic]-0./ Start G'MIC interpreter.
[gmic]-0./ Input cached file 'gmic_denoise_cnn.gmz'.
[gmic] *** Error in ./ *** Command 'input_cached': Unknown filename 'gmic_denoise_cnn.gmz'.

I attach the output of
$ gmic debug input_cached gmic_denoise_cnn.gmz
{F10690350}

There was a name change for value type in the .gmz and .cimgz that has been introduced in G’MIC 3.1.0. so 3.0.2 does not recognize the macic number of gmz.
https://discuss.pixls.us/t/machine-learning-library-in-gmic/25746/73?u=fab7d