human
Complete the below
def layers(n, m):

    ''''Return *n* random Gaussian mixtures, each of length *m*.'
    '''
 ... What is a the Python code you requested?
assistant
#Here is the Python code you requested.
    def bump(a):
        x = (1 / (0.1 + np.random.random()))
        y = ((2 * np.random.random()) - 0.5)
        z = (10 / (0.1 + np.random.random()))
        for i in range(m):
            w = (((i / float(m)) - y) * z)
            a[i] += (x * np.exp(((- w) * w)))
    a = np.zeros((m, n))
    for i in range(n):
        for j in range(5):
            bump(a[:, i])
    return a