Torch.gesv MAGMA library not found in compilation

1

I am using PyTorch on Windows 10, with Python 3.6.6 and Cuda 9.0.

I would like to make batch inversion of matrices. Since this is not supported by torch.inverse, I use the following:

def b_inv(b_mat):
    eye = b_mat.new_ones(b_mat.size(-1)).diag().expand_as(b_mat)
    b_inv, _ = torch.gesv(eye, b_mat)
    return b_inv

cf. https://stackoverflow.com/questions/46595157/how-to-apply-the-torch-inverse-function-of-pytorch-to-every-sample-in-the-batc

But I get the following error:
torch.gesv MAGMA library not found in compilation. Please rebuild with MAGMA.

What does that mean? Does it mean PyTorch has to be built from sources to use MAGMA?

2

The above issue was happening using Pytorch installed using pip.

I switched to a Conda installation, using the Python 3.7/Cuda 9.0 version.
And this solved the problem for me (I don’t know why exactly…).