Course Objectives

Natural Language Processing (NLP) is one of the most important fields in Artificial Intelligence (AI). It has become very crucial in the information age because most of the information is in the form of unstructured text. NLP technologies are applied everywhere as people communicate mostly in language: language translation, web search, customer support, emails, forums, advertisement, radiology reports, to name a few.

There are a number of core NLP tasks and machine learning models behind NLP applications. Deep learning, a sub-field of machine learning, has recently brought a paradigm shift from traditional task-specific feature engineering to end-to-end systems and has obtained high performance across many different NLP tasks and downstream applications. Tech companies like Google, Baidu, Alibaba, Apple, Amazon, Facebook, Tencent, and Microsoft are now actively working on deep learning methods to improve their products. For example, Google recently replaced its traditional statistical machine translation and speech-recognition systems with systems based on deep learning methods.

Optional Textbooks

  • Deep Learning by Goodfellow, Bengio, and Courville free online
  • Machine Learning — A Probabilistic Perspective by Kevin Murphy online
  • Natural Language Processing by Jacob Eisenstein free online
  • Speech and Language Processing by Dan Jurafsky and James H. Martin (3rd ed. draft)

Intended Learning Outcomes

In this course, students will learn state-of-the-art deep learning methods for NLP. Through lectures and practical assignments, students will learn the necessary tricks for making their models work on practical problems. They will learn to implement, and possibly to invent their own deep learning models using available deep learning libraries like Pytorch.

Our Approach

  • Thorough and Detailed: How to write from scratch, debug and train deep neural models

  • State of the art: Most lecture materials are new from research world in the past 1-5 years.

  • Practical: Focus on practical techniques for training the models, and on GPUs.

  • Fun: Cover exciting new advancements in NLP (e.g., Transformer, BERT).

Assessment Approach

Weekly Workload

  • Every two-hour lecture will be accompanied by practical problems implemented in PyTorch.
  • There will be NO office hour.
  • There will be 5% marks for class participation.

Assignments (individually graded)

  • There will be three (3) assignments contributing to 3 * 15% = 45% of the total assessment.
  • Late day policy
    • 2 free late days; afterwards,10% off per day late
    • Not accepted after 3 late days
  • Students will be graded individually on the assignments. They will be allowed to discuss with each other on the homework assignments, but they are required to submit individual write-ups and coding exercises.

Final Project (Group work but individually graded)

  • There will be a final project contributing to the remaining 50% of the total course-work assessment.
    • 1–3 people per group
    • Project proposal: 5%, update: 5%, presentation: 10%, report: 30%
  • The project will be a group or individual work depending on the student’s preference. Students will be graded individually. The final project presentation will ensure the student’s understanding of the project

Course Prerequisites

  • Proficiency in Python (using numpy and PyTorch). There is a lecture for those who are not familiar with Python.
  • College Calculus, Linear Algebra
  • Basic Probability and Statistics
  • Machine Learning basics

Teaching

Instructor

Schedule & Course Content

 
 
 
 
 

Week 8: Recess Week

06:30 PM - 9:30 PM 6 March 2020 LTE 5, NTU, Singapore

No Lecture

Project Proposal Instructions in NTU Learn (inside Content)

Project Proposal due

Assignment 2 in

 
 
 
 
 

Week 7: Recursive Neural Nets & Parsing

06:30 PM - 9:30 PM 28 February 2020 LT10, NTU, Singapore

Lecture Slide

Video Lecture - Part 1

Video Lecture - Part 2

Lecture Content

  • Compositionality in language & recursion
  • Recursive vs. recurrent NN
  • Parsing with tree-structured recursive NN
  • Tree LSTMs
  • Backpropagation through tree
  • Other applications of recursive NN

    • Fine-grained sentiment analysis
    • Semantic relationship identification
  • Modern parsers

Practical exercise with Pytorch

  • Sentiment treebank
  • Subject-Verb Agreement

Suggested Readings

 
 
 
 
 

Week 6: Recurrent Neural Nets

06:30 PM - 9:30 PM 21 February 2020 LT10, NTU, Singapore

Lecture Slide

Video Lecture - Part 1

Video Lecture - Part 2

Lecture Content

  • Basic RNN structures
  • Language modeling with RNNs
  • Backpropagation through time
  • Text generation with RNN LM
  • Issues with Vanilla RNNs
  • Exploding gradient
  • Gated Recurrent Units (GRUs) and LSTMs
  • Bidirectional RNNs
  • Multi-layer RNNs
  • Sequence labeling with RNNs
  • Sequence classification with RNNs

Assignment 2 out

Practical exercise with Pytorch

Suggested Readings

 
 
 
 
 

Week 5: Cross-lingual Word Vectors & CNNs

06:30 PM - 9:30 PM 14 February 2020 LT10, NTU, Singapore

Lecture Slide

Slides with video

Lecture Content

  • Cross-lingual word embeddings
  • Classification tasks in NLP
  • Window-based Approach for language modeling
  • Window-based Approach for NER, POS tagging, and Chunking
  • Convolutional Neural Net for NLP
  • Max-margin Training
  • Scaling Softmax (Adaptive input & output)

Assignment 1 in

Practical exercise with Pytorch

Suggested Readings

 
 
 
 
 

Week 4: Word Vectors (Monolingual)

06:30 PM - 9:30 PM 7 February 2020 LT10, NTU, Singapore
 
 
 
 
 

Week 3: Neural Network & Optimization Basics

06:30 PM - 9:30 PM 31 January 2020 LT10, NTU, Singapore

Lecture Slide

Lecture Content

  • Why Deep Learning for NLP?

  • From Logistic Regression to Feed-forward NN

    • Activation functions
  • SGD with Backpropagation

  • Adaptive SGD (Adagrad, adam, RMSProp)

  • Regularization (Weight Decay, Dropout, Batch normalization, Gradient clipping)

  • Introduction to Word Vectors

Assignment 1 out

Practical exercise with Pytorch

Numpy notebook Pytorch notebook

  • Backpropagation
  • Dropout
  • Batch normalization
  • Initialization
  • Gradient clipping

Suggested Readings

 
 
 
 
 

Week 2: Machine Learning Basics

02:30 PM - 5:30 PM 22 January 2020 LT13, NTU, Singapore

Lecture Slide

Lecture Content

  • What is Machine Learning?
  • Supervised vs. unsupervised learning
  • Linear Regression
  • Logistic Regression
  • Multi-class classification
  • Parameter estimation (MLE & MAP)
  • Gradient-based optimization & SGD

Practical exercise with Pytorch

 
 
 
 
 

Week 1: Introduction

06:30 PM - 9:30 PM 17 January 2020 LT10, NTU, Singapore

Lecture Slide

Lecture Content

  • What is Natural Language Processing?
  • Why is language understanding difficult?
  • What is Deep Learning?
  • Deep learning vs. other machine learning methods?
  • Why deep learning for NLP?
  • Applications of deep learning to NLP
  • Knowing the target group (background, field of study, programming experience)
  • Expectation from the course

Python & PyTorch Basics