added missing label method for nlp_datasets

[junaidahmed361]

Summary:

nlp_datasets.py was missing the label method. This caused a breakage of the huggingface wrapper when labelling the active dataset. It couldn't validate the dataset as able to be labelled, and thereby went into the backup condition and suffered a keyerror when looking for key '0'.

Features:

Added a label method for nlp_datasets which sets the value for the index of the targets array.

Checklist:

• Your code is documented (To validate this, add your module to tests/documentation_test.py).
• Your code is tested with unit tests.
• You moved your Issue to the PR state.

[parmidaatg]

Hi @junaidahmed361,
Thank you so much for your PR.
Could you elaborate on how did you use the HuggingFace wrapper?
the suggested methodology which was in the experiments is as below and this way hugging face wrapper should use the label method of ActiveLearningDataset:
dataset = ActiveLearningDataset(HuggingFaceDataset(dataset))

[Dref360]

Hello,

Good addition thanks!

1. Can we add a unit test
2. You can format your code by running make format