Not support pytorch 1.6

[wyattsuen]

Hi, thanks for this package. But the warp-rnnt can't support pytorch 1.6. Would you kindly update a newer version which support the newest pytorch and a cpu version?

[1ytic]

In order to install a custom gpu torch extension, you need to install CUDA tools and libraries independently from python cudatoolkit package. Make sure that you have installed CUDA in /usr/local/cuda. I tested with CUDA 11.1 and PyTorch 1.6 and cudatoolkit 10.2. All test works fine: python -m warp_rnnt.test.