I'm a beginner of nlp. I'm wondering who is annotator of corpus usually ? Who does actually do works of annotating ? Researchers?
For those people who have ambitious aims for NLP. If you want to reveal secret insights from your corpus, you need to work on it. Supervised learning is mostly used for labeling your features. Then thanks to some ML algorithms you are creating model that is suitable for your work. At that point, you need someone/people to label your corpus. Annotators are taking stepping in that stage.