Hi

I want to use a distribution which has the form:

```
log_prob(x) = -(x-mu)**4/sig**4 + const.
```

Lets call this log_f(x).

I thought about using the `Rejector`

class since this can be enveloped by a `Normal(loc, sig)`

in a rejection sampler (lets call the log_prob of the Normal log_g to match with wikipedia’s rejection sampling) .

However, the docs aren’t clear on the following items:

#### log_prob

- is
`log_prob_accept`

the full acceptance probability i.e. log_f(x) - log_g(x) - log(M) - OR is it just log_f(x)

#### log_scale

- what is this? The docs say “Total log probability of acceptance” .

If someone could point me int he right direction I’d be very grateful.