For the dataset.py/init_callable, you shoul also catch Attribute error

[nkundiushuti]

I have implemented the Largedataset class as you recommended, and the dataset method yields this error:
AttributeError: LargeDataset instance has no attribute 'len'
In my opinion, you should also catch this error in dataset.py
try:
self.iteration_size = len(samples)
except TypeError: # has no len
If you want, I can share the LargeDataset class with you, but it's a bit particular to my problem. I have added the len attribute to return the number of batches in one dataset file which is loaded from hard drive.

[lmjohns3]

This is a good idea! In the meantime, I have moved the Dataset class to another package -- https://github.com/lmjohns3/downhill. It looks like there's not a quick way to move an issue to another repository, so I'm going to close this one here and open it there: lmjohns3/downhill#1