'Fill ary with normally distributed random numbers.
Arguments:
ary (Tensor): Tensor to fill with random values
mean (float): Mean value. Default 0
stdv (float): standard deviation value.  Default 1'

def fill_normal(self, ary, mean=0, stdv=1):

    ary[:] = ((np.random.standard_normal(ary.shape) * stdv) + mean)
