The main function is
```
-torch.ByteTensor generate_vignettes(int problem_number, torch.LongTensor labels)
+torch.ByteTensor svrt.generate_vignettes(int problem_number, torch.LongTensor labels)
```
where
```
make -j -k
-./build.py
./test-svrt.py
```
should generate an image example.png in the current directory.
Note that the image generation does not take advantage of GPUs or
-multi-core, and can be as slow as 40 vignettes per second s on a 4GHz
-i7-6700K.
+multi-core, and can be as fast as 3,000 vignettes per second and as
+slow as 40 on a 4GHz i7-6700K.