fix datatype option for wizard_of_internet task

[heya5]

Patch description
Fix a bug of wizard_of_internet task. This bug led to a wrong number of examples when use "train:evalmode" as datatype.
The problem is like this:

Testing steps
To test this PR, you can run parlai convert_to_json -t wizard_of_internet --datatype train:evalmode
Expect to get the correct number of samples.

[mojtaba-komeili]

Thanks for reporting the bug. I don't see how this fixes it though. Unless I missed something, get_dtype function and the DatatypeHelper are doing the same thing?

[heya5]

Hi, you can check the get_dtype() function, it will return "train" when we use "train:evalmode" as datatype. Because the get_dtype() function will call DatatypeHelper.fold method in which the datatype is splited by ":".
When we set "train:evalmode" or "train:ordered" as datatype, the WizardOfInternetBaseTeacher still get train as datatype.

[heya5]

Hi, I see a Linting problem, but it doesn't seem to be related to this PR.

[mojtaba-komeili]

Don't worry we had some issues relate to the tests recently.

[github-actions]

This PR has not had activity in 30 days. Closing due to staleness.