[(['are', 'We', 'to', 'study'], 'about'), (['about', 'are', 'study', 'the'], 'to'), (['to', 'about', 'the', 'idea'], 'study'), (['study', 'to', 'idea', 'of'], 'the'), (['the', 'study', 'of', 'a'], 'idea')]

tensor([39, 11, 38,  3])