def unfix_parameters(self):
        """Helper function that unfixes all parameters"""
        for W, b in zip(self.W_list, self.b_list):
            W.unfix()
            b.unfix()
def unfix_parameters ( self ) : for W , b in zip ( self . W_list , self . b_list ) : W . unfix ( ) b . unfix ( )
Helper function that unfixes all parameters