Looking at a recent CI run errors like:

test_multinomial_invalid_probs_cuda (main.TestCuda) ... /var/lib/jenkins/workspace/aten/src/THC/THCTensorRandom.cuh:185: void sampleMultinomialOnce(long *, long, int, T *, T *, int, int) [with T = double, AccT = double]: block: [0,0,0], thread: [1,0,0] Assertion THCNumerics<T>::ge(val, zero) failed.

appear when test_cuda.py is run. This does not cause the test to fail and may only be cosmetic.