def get_alpha_value(self):
        '''
        getter
        Learning rate.
        '''
        if isinstance(self.__alpha_value, float) is False:
            raise TypeError("The type of __alpha_value must be float.")
        return self.__alpha_value
def get_alpha_value ( self ) : if isinstance ( self . __alpha_value , float ) is False : raise TypeError ( "The type of __alpha_value must be float." ) return self . __alpha_value
getter
        Learning rate.