Review algorithms of the functions we are using for chatbot

[Grixtli]

See this pdf as reference of the different algorithms

http://users.isr.ist.utl.pt/~wurmd/Livros/school/Bishop%20-%20Pattern%20Recognition%20And%20Machine%20Learning%20-%20Springer%20%202006.pdf

[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