human
Complete the below
def bench_R2():

    ''''Hermite polynomial hermite(15, y)'
    '''

What is a the Python code you requested?
assistant
#Here is the Python code you requested.
    def hermite(n, y):
        if (n == 1):
            return (2 * y)
        if (n == 0):
            return 1
        return (((2 * y) * hermite((n - 1), y)) - ((2 * (n - 1)) * hermite((n - 2), y))).expand()
    a = hermite(15, y)