self.training = training assignment is failing

[VeereshShringari]

I just ran the code with demo dataset but self.training = training gives an error :

self.training = training
AttributeError: can't set attribute

[AmnaAliA]

same here

[JunMeng2437]

add

@property
def training(self):
    return self._training

@training.setter
def training(self, value):
    self._training = value

in the GraphicBuilder definition