I noticed that this repo contains code copied from https://github.com/ConstrainedSampler/PolytopeSamplerMatlab (e.g. https://github.com/GeomScale/volesti/blob/75b76ccd33fe27aaf6a8ed6216fac521889908d2/external/PackedCSparse/SparseMatrix.h is copied from https://github.com/ConstrainedSampler/PolytopeSamplerMatlab/blob/f85505cc33ddef08982c0b1bf78eaccfe6d4ce47/code/solver/PackedCSparse/SparseMatrix.h).
This is relevant because that repo is licensed under GPL while this repo is licensed under LGPL.
The first issue is that the missing(/incorrect?) copyright notice and missing notice that the files are GPL licensed which are both required when redistributing these GPL licensed sources.
The more sigificant issue is that this has consequences for volesti as a whole:
By distributing a program (volesti) which is partly a modifcation of a GPL program (PolytopeSamplerMatlab) you must license the entire program under the GPL. So the current license (LGPL) is not allowed. See https://github.com/ConstrainedSampler/PolytopeSamplerMatlab/blob/f85505cc33ddef08982c0b1bf78eaccfe6d4ce47/LICENSE#L222.
If you have permissions from the author of the relevant files to redistribute them under a seperate license, please document that.
Otherwise, it would probably be best to reach out to the author and depending on their response remove their code from the repo (I have not checked how critical it is to volesti).
I noticed that this repo contains code copied from https://github.com/ConstrainedSampler/PolytopeSamplerMatlab (e.g. https://github.com/GeomScale/volesti/blob/75b76ccd33fe27aaf6a8ed6216fac521889908d2/external/PackedCSparse/SparseMatrix.h is copied from https://github.com/ConstrainedSampler/PolytopeSamplerMatlab/blob/f85505cc33ddef08982c0b1bf78eaccfe6d4ce47/code/solver/PackedCSparse/SparseMatrix.h).
This is relevant because that repo is licensed under GPL while this repo is licensed under LGPL.
The first issue is that the missing(/incorrect?) copyright notice and missing notice that the files are GPL licensed which are both required when redistributing these GPL licensed sources.
The more sigificant issue is that this has consequences for volesti as a whole:
By distributing a program (volesti) which is partly a modifcation of a GPL program (PolytopeSamplerMatlab) you must license the entire program under the GPL. So the current license (LGPL) is not allowed. See https://github.com/ConstrainedSampler/PolytopeSamplerMatlab/blob/f85505cc33ddef08982c0b1bf78eaccfe6d4ce47/LICENSE#L222.
If you have permissions from the author of the relevant files to redistribute them under a seperate license, please document that.
Otherwise, it would probably be best to reach out to the author and depending on their response remove their code from the repo (I have not checked how critical it is to volesti).