Recently, I encountered this problem when running the point cloud semantic segmentation project RandLA-Net, and it has now been solved.
AttributeError: type object 'IteratorBase' has no attribute 'from_structure'
Property error, no from_structure property in type object 'IteratorBase'
The reason for this problem: In TensorFlow2.x version, the class corresponding to the IteratorBase object does not encapsulate the from_structure attribute. So the error is caused.
Solution: Install TensorFlow1.x. After I installed TensorFlow1.11, this problem did not occur again.