Getting e.g. the tarball for the 1.8.0 release one has:
$ cat schemes-1.8.0/schemes/ml/symbol-frequency-report.txt
version https://git-lfs.github.com/spec/v1
oid sha256:9d24c8a04d3bf8f54c6236de7c9fa002e37eaf6d27a8e3bacab8844262aec76d
size 13049
This makes distro packaging hard as the tarball isn't usable as is to rebuild the scheme files. Please consider shipping the files as is.