References
[1] 8 Parts of Speech: http://www.butte.edu/departments/cas/tipsheets/grammar/parts_of_speech.html
[2] Parts of Speech overview: http://partofspeech.org/
[3] spaCy Annotation Specifications: https://spacy.io/api/annotation#pos-tagging
[4] Hidden Markov Model: https://en.wikipedia.org/wiki/Hidden_Markov_model
[5] A simple rule-based part of speech tagger: http://www.aclweb.org/anthology/A92-1021
[6] displaCy: https://explosion.ai/demos/displacy
[7] ntlk tag module: https://www.nltk.org/api/nltk.tag.html
[8] nltk chapter 5: https://www.nltk.org/book/ch05.html
[9] Training NLTK tagger: http://textminingonline.com/dive-into-nltk-part-iii-part-of-speech-tagging-and-pos-tagger
[10] AI in Practice: Identifying Parts of Speech in Python: https://medium.com/@brianray_7981/ai-in-practice-identifying-parts-of-speech-in-python-8a690c7a1a08
[11] Speech Tagging in TextBlob: https://stevenloria.com/pos-tagging/
[12] spaCy training: https://spacy.io/usage/training
[13] prodigy: https://prodi.gy/
[14] Gold...