Probabilist’s Hermite polynomial (#78357)
Adds:
```Python
hermite_polynomial_he(input, n, *, out=None) -> Tensor
```
Physicist’s Hermite polynomial $He_{n}(\text{input})$.
If $n = 0$, $1$ is returned. If $n = 1$, $\text{input}$ is returned. Otherwise, the recursion:
$$He_{n + 1}(\text{input}) = 2 \times \text{input} \times He_{n}(\text{input}) - He_{n - 1}(\text{input})$$
is evaluated.
## Derivatives
Recommended $k$-derivative formula with respect to $\text{input}$:
$$\frac{d^{k}}{d \times \text{input}^{k}} He_{n}^{(k)} = \frac{n!}{(n - k)!}He_{n - k}(\text{input}).$$
Pull Request resolved: https://github.com/pytorch/pytorch/pull/78357
Approved by: https://github.com/mruberry
