Package manager choice: conda vs. pip

I was wondering why conda is preferred over pip.
pip was used to compile from source, but now it installs binary wheels too.
Any major difference? For Torch we went through 5 (?) package managers at least…

Edit: OK, this quote “Pip is a package manager, and Virtualenv is an environment manager. Conda is both.” (ref.) may explain it.

This is because conda manages dependencies that are not just python dependencies.

For example with conda, we get tighter control over which BLAS is installed.


Hi, I met a problem as follows:
BLAS : Program is Terminated. Because you tried to allocate too many memory regions.

After setting threads as follows,
The problem was solved. Therefore, the problem is aroused from multi-thread of CPUs.

I just used 50 or 100 images as a batch, where each image is 3224224. The machine has 2 GPUs – Tesla M40, 2 CPUs–Intel Xeon E5 v4 CPU. Because I cannot connect with conda, I download Pytorch and torchvision sources, and compile them. The cuda version is 7.5, the cudnn version is 5.1.

How can I deal with the problem? Thank you beforehand.

It looks as if your script ran out of memory.

I guessed the problem is caused by the imcompatibility of OpenBLAS with Pytorch, because the problem is totally solved by reinstalling Pytorch with the command ‘conda install pytorch torchvision -c soumith’. It is heard that Pytorch compiled from the sources of github cannot well control OpenBLAS.

I haven’t heard about problems with OpenBLAS before, but I don’t think it’s really a PyTorch bug, since we’re only calling its functions. If it can’t manage its threads properly, there’s nothing we can do about it. I’d recommend using MKL.

Yes, I do agree with you. It is not the problem of Pytorch. I just recorded the problem and its solution to tell other persons the underlying imcompatibility of OpenBLAS, and follow the simplest installing way. :slight_smile: