def elliot_function( signal, derivative=False ):
    s = 1 # steepness
    
    abs_signal = (1 + np.abs(signal * s))
    if derivative:
        return 0.5 * s / abs_signal**2
    else:
        # Return the activation signal
        return 0.5*(signal * s) / abs_signal + 0.5
#end activation function
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