There is a bug in CVAE example. The target input to the MaskedBCELoss is not binary (it has values of -1, 0, 1). This was discovered by the PyTorch 2.1 update which started to validate the inputs of F.binary_cross_entropy_loss.

FAILED tests/test_examples.py::test_cpu[cvae/main.py --num-quadrant-inputs=1 --num-epochs=1] - subprocess.CalledProcessError: Command '['/opt/hostedtoolcache/Python/3.8.18/x64/bin/python', '/home/runner/work/pyro/pyro/examples/cvae/main.py', '--num-quadrant-inputs=1', '--num-epochs=1']' returned non-zero exit status 1.
= 1 failed, 148 passed, 97 skipped, 26558 deselected, 2 warnings in 1948.89s (0:32:28) =