Part-of-speech tagging

Stop word removal

Stemming

Continuous Bag of Words (CBOW)

Latent Dirichlet Allocation

Term frequency-inverse document frequency ( TF-IDF )

Word Cloud

Lemmatization

Skip-gram

Perplexity Value

BERT (Bidirectional Encoder Representations from Transformers)

Orthogonal Space Bigram ( OSB )