Review Botpress code and identifiy what funtions we are using for chatbot

[raaul19]

Main algorithms of the functions:

• NLU: Natural Language Understanding
• ML: Machine Learning
• NDU: Natural Dialog Understanding
• SVM: Support Vector Machines (supervised learning models), They use Node-binding to
• LIBSVM
• CRF: Conditional Random Field, for slot extraction
• FastText: to compute word vectors
• Sentencepiece: to tokenize input sentences