def calculate_chaikin_money_flow_signal(cmf: pd.Series) -> pd.Series:
"""
Generates a trend reversal signal from Chaikin Money Flow. A false signal
may occur when the trend is weak, barely crossing over zero.
Args:
:cmf (pd.Series): Chaikin Money Flow series
Returns:
pd.Series: signal -1, 0 ,1
"""
cmf_sign = np.sign(cmf)
cmf_shifted_sign = cmf_sign.shift(1)
cmf = cmf_sign * (cmf_sign != cmf_shifted_sign)
cmf.Name = 'chakin_signal'
return cmf
