The following is from official tutorial

```
def geometric(p, t=None):
if t is None:
t = 0
x = pyro.sample("x_{}".format(t), pyro.distributions.Bernoulli(p))
if x.item() == 1:
return 0
else:
return 1 + geometric(p, t + 1)
print(geometric(0.5))
```

Why they’re renaming the sample function? I tried it without renaming and it is working fine