human
Can you provide a the Python code you requested given the following:
Complete the below
def f_accel_decel(t, old_d, new_d, abruptness=1, soonness=1.0):

    ''''abruptness
    negative abruptness (>-1): speed up down up
    zero abruptness : no effect
    positive abruptness: speed down up down
    soonness
    for positive abruptness, determines how soon the
    speedup occurs (0<soonness < inf)'
    '''
assistant
#Here is the Python code you requested.
    a = (1.0 + abruptness)
    def _f(t):
        f1 = (lambda t: ((0.5 ** (1 - a)) * (t ** a)))
        f2 = (lambda t: (1 - f1((1 - t))))
        return (((t < 0.5) * f1(t)) + ((t >= 0.5) * f2(t)))
    return (old_d * _f(((t / new_d) ** soonness)))