Apex: warning: integer conversion resulted in a change of sign
Building apex on my system (Ubuntu 18.04) is successfull, but the building process is full of the following warning
warning: integer conversion resulted in a change of sign
I don't know anything about C++, but I would imagine that if in math the sign is changed unexpectedly, that could have grave consequences.
BramVanroy
>All comments
The same warning appears when I compile the torch cpp extension tests
$ cd pytorch_repo/test/cpp_extensions
$ python setup.py install
The first few extensions, compiled with gcc, do not show the warning, but two later extensions, compiled with nvcc, do show the warning.
So I don't think this has to do with apex and it doesn't appear to affect the operation. In fact, looking at the pytorch source where the warning comes from, it may be a deliberate hack to set repr_ to all 1s, since repr_ is an unsigned integer, and nvcc is being pedantic about warning us.
mcarilli
on 16 Oct 2019
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Most helpful comment
The same warning appears when I compile the torch cpp extension tests
The first few extensions, compiled with gcc, do not show the warning, but two later extensions, compiled with nvcc, do show the warning.
So I don't think this has to do with apex and it doesn't appear to affect the operation. In fact, looking at the pytorch source where the warning comes from, it may be a deliberate hack to set repr_ to all 1s, since repr_ is an unsigned integer, and nvcc is being pedantic about warning us.