Add the BIO format for the named entities.

Add download_and_extract

Remove iter

Fix : Message: Extraction protocol for TAR archives like 'https://amazon-massive-nlu-dataset.s3.amazonaws.com/amazon-massive-dataset-1.0.tar.gz' is not implemented in streaming mode. Please use instead.

Fix the issue with en-US like in the documentation

Add data loader for Amazon Massive corpus