Math question related to pyro usage(infinity values)

[drsz]

The following code generates infinity(inf) or 0. Why does it generate ininity?

a = pyro.sample("test1", pyro.distributions.Gamma(torch.tensor([0.0000000000000001]), torch.tensor([0.000000000001]))) pyro.sample("test", pyro.distributions.LogNormal(0., 1./a))