Accessing VersionedDataset attributes gives unresolved attribute warnings

[kostaleonard]

VersionedDataset sets some attributes, specifically tensors, with setattr(). Using this function allows users to access features and labels with dataset.X_train and so on. However, PyCharm and other IDEs raise warnings for attributes set in this manner. Find a way to resolve these warnings.

Potential references:

• https://stackoverflow.com/questions/29497096/attributes-set-with-setattr-show-as-unresolved-references-in-pycharm