def fit(self, x, y):
    reg = DBEstReg().fit(x, y)
    density = DBEstDensity().fit(x)
    self.simpe_model_wrapper.load_model(density, reg)
    return self.simpe_model_wrapper
def fit(self, x, y):
    reg = DBEstReg().fit(x, y)
    density = DBEstDensity().fit(x)
    self.simpe_model_wrapper.load_model(density, reg)
    return self.simpe_model_wrapper