Charlotte Bots and AI group meetup presentation for September 2018 on Building Natural Language Processing solutions

1. Building NLP solutions
using Python
By Ramu Pulipati,
@botsplash

2. Introduction to NLP
• Natural Language:
• General purpose communications
• Distinct difference between humans and Animals
• Much difficult to interpret from Formal Language
• Natural Language Processing (NLP) Advancements
• Earlier focus was on Linguistics and Computer Science
• Current evolution is focused on Machine Learning, specifically
Deep Learning and Neural Networks
• Varied degrees of implementation based on use case

3. Scope of Natural Language Processing
• Read
• Natural Language Understanding (NLU)
• Write
• Natural Language Generation (NLG)
• Speak
• Speech Recognition / Syntesis

4. NLP Applications

5. More Applications …
• Email Spam
• Siri / Alexa / Cortana
• Legal Contacts to find Action
clauses
• Health Care Records
• Energy Sector / Utilities /
Inspection Records
• Automated Agents
• Appointment Scheduling
• Auto Email Responses
• Typing Suggestions
• Spelling Check
• Predicting Crops
• Social Media Propaganda
• Press/Earnings releases
• Weather Reports
• Search Engines
• News categorization
• Chatbot
• NY Times Oped author analysis

6. State of NLP
Source: https://www.slideshare.net/healess/sk-t-academy-lecture-note

7. Botsplash AI Strategy
Machine
Learning
Natural
Language
Processing
Predictive
Analytics
Routing Intelligence
High Intent Conversion Detection
Trends and Behavior
End Chat, Spam Detection
Content and Sentiment
FAQ, Support, Transaction
Chatbot
Re-engagement
Smart Scheduling
UI Interactions

8. Focus on solvable/acceptable problems
I’m looking for 30yr mortgage loan in Charlotte, NC
(Named Entity Recognition)
Thanks for your help. Great chatting with you.
(classification)
Lets connect tomorrow. Anytime evening will work for me.
(classification / intent / actionable)
This rate is unacceptable. What can you do?
(sentiment)

9. Leading NLP Providers
• AWS Comprehend
• Google Cloud NLP
• Microsoft Project Oxford
• IBM Watson
• Aylien
• Cennest Comparison:
https://cognitiveintegratorapp.azurewebsites.net/

10. Text Processing Roundup
• Normalization
• Text Classification
• Text Similarity
• Text Extraction
• Topic Modeling
• Semantic Search
• Sentiment Analysis

11. NLP Pipeline
• Classical
follows
traditional ML
strategies
• Deep Learning
requires lot of
data

12. Getting started
• Python Installation. Use 3+.
• Data science packages installation. Use “pip install” or Anaconda
• Always use “virtualenv” when setting up environments.
• Start with Jupyter notebooks and convert it production code.
• Use cloud hosted jupyter notebooks with access to GPU from
floydhub, paperspace, Google, Amazon or Azure

13. Python packages for NLP
• NLP Focus Packages
• NLTK
• Spacy
• Gensim
• Textblob
• Scikit Learn
• Stanford NLP (java)
• WordNet, SentiWordNet
• FastText / MUSE / Faiss
• Deep Learning Frameworks
• Tensorflow / Keras
• Pytorch
• Other Noteworth
• Scrapy
• Newspaper
• nlp-architect

14. NLTK Code Tour
• Tokenization (Dictionary and Regex)
• Stemming
• Lemma
• NLP Grammar - Chunking and Chinking
• Entity Recognition
• WikiQuiz

15. Word Embeddings
• Paper published by Mikolov 2013
Example: Man is to Woman, then King is to _______
• Multi-dimensional space of word representations with proximity
based on similarity of the words (word vectors)
• Algebraic expressions can be applied on Word vectors
• Building Word embedding: Provide lot of data with features to look
• Word2vec is a popular word embedding implemented with Neural
network
• Other implementations such as Glove use co-occurrence matrices

16. Word2vec paper results

17. Spacy.io Lightning Tour
• Industrial Strength, Fast
• POS Tagging and Dependency Parsing
• Named Entities, Word embedding and Similarity
• Custom Pipelines
• Visualization

18. Text classification
• Use cases: Spam, Actionable events, Intents
• For Content based or Request based
classification
• Steps involve Preparing -> Training ->
Prediction
• Feature Extractions
• Bag of Words
• TD-IDF model
• Word Vectors: Averaged, TD-IDF, tc
• Starspace model
• FastText
• Classification alg: Multinomial Bayes or SVM

19. Steps to classifying your data
1. Identify tags to be applied
2. Manually add tags for the
data (possibly in the
application)
3. Build a classification
algorithm
4. Setup your application to
auto classify tags
5. Evaluate silently and then
enable the actions

20. Sentiment Analysis
• Use case: Reviews, Chat transcripts, etc
• Supervised techniques are effective for a domain
• Packages:
• SentiWordNet
• StanfordNLP
• Spacy Sentiment Analysis (incomplete)

21. Summarization
• Summarization is hard
• Uses variety of techniques including Text extraction, Feature Matrix,
TD-IDF, Co-location, SVD and other methods
• Implement LSA to under
• Review of implementations:
• Spacy
• TextRank
• Pyteaser
• Textteaser
• Sumy

22. Code Review / Demo Apps
• Jupyter Notebooks
• NLTK Code Review
• Space Code Review
• NLTK Grammar Parsing
• WikiQuiz
• Sequence to Sequence Chatbot
• DeepQA demo
• Topic Modeling Code Review
• Text Similarity – Phrase Matcher API

23. Follow up Learning
• Websites:
• Allen AI - NLP
• Fast AI
• Malabuba
• Coursera
• Youtube
• Resources
• Sanni Oluwatoyin Yetunde
Google Slides
• Cambridge Data Science
Group presentation
• nlp.fast.ai