Automatically download again when cache is corrupt?

[joaquinvanschoren]

Description

When the dataset download is corrupted the user gets a cryptic error message. Clearing the cache fixes it but this may not be obvious to people. Could we either show a better error message, or automatically try to remove the cached file and try again?

Steps/Code to Reproduce

Hard to reproduce. It requires a bad file download. This is what information I received:

data = openml.datasets.get_dataset(did)
data.get_data()

AttributeError: ‘DataFrame’ object has no attribute ‘_data’

Expected Results

Either the dataset should load or an error message that explains what is wrong.

Actual Results

A cryptic error message:

AttributeError: ‘DataFrame’ object has no attribute ‘_data’