Class Website

CX4242:

Data & Visual Analytics

Mahdi Roozbahani

Lecturer, Computational Science and

Engineering, Georgia Tech

CX 4242 A 86107 will now meet in CoC

102 starting Tues of next week

Assignments Overview(Tentative and subject to change)

C X 4242

Assignment 1

Platforms, Languages & TechnologiesPython, Gephi, SQLite, D3, OpenRefine

QuestionsQ1: Collecting and visualizing data (Python & Gephi)

Q2: Analysing data using SQLite

Q3: D3 Warmup

Q4: Analysing data through OpenRefine

Assignment 2

Platforms, Languages & TechnologiesD3, Tableau

QuestionsQ1: Designing a good table and visualizing data with Tableau Q2: Force

directed graph using D3

Q3: Scatter plots using D3 Q4: Heatmap using D3

Q5: Interactive visualization using D3 Q6: Choropleth map

using D3

Q7: Pros and cons of various visualization tools

Assignment 3

Platforms, Languages & TechnologiesJava, Hadoop, Spark, Pig, Azure

QuestionsQ1: Analyzing a graph with Hadoop/Java

Q2: Analyzing a graph with Spark/Scala on Databricks Q3: Analyzing

data with Pig on AWS

Q4: Analyzing a graph using Hadoop on Microsoft Azure Q5:

Regression using Azure ML Studio

Assignment 4

Platforms, Languages & TechnologiesPypy, PageRank, Random Forest, SciKit Learn

QuestionsQ1: Scalable single-machine PageRank

Q2: Implementing a random forest classifier

Q3: Using Scikit-Learn for running various classifiers

Collection

Cleaning

Integration

Visualization

Analysis

Presentation

Dissemination

Building blocks. Not Rigid “Steps”.

Can skip some

Can go back (two-way street)

• Data types inform visualization design

• Data size informs choice of algorithms

• Visualization motivates more data cleaning

• Visualization challenges algorithm

assumptions

e.g., user finds that results don’t make sense

Collection

Cleaning

Integration

Visualization

Analysis

Presentation

Dissemination

How “big data” affects the

process?(Hint: almost everything is harder!)

The Vs of big data (3Vs originally, then 7, now 42)

Volume: “billions”, “petabytes” are common

Velocity: think Twitter, fraud detection, etc.

Variety: text (webpages), video (youtube)…

Veracity: uncertainty of data

Variability

Visualization

Value

Collection

Cleaning

Integration

Visualization

Analysis

Presentation

Dissemination

http://www.ibmbigdatahub.com/infographic/four-vs-big-data

http://dataconomy.com/seven-vs-big-data/

https://tdwi.org/articles/2017/02/08/10-vs-of-big-data.aspx

Three Example Projects from Polo and Mahdi Research group

Apolo Graph Exploration:

Machine Learning + Visualization

18

Apolo: Making Sense of Large Network Data by Combining Rich User Interaction and Machine Learning.

Duen Horng (Polo) Chau, Aniket Kittur, Jason I. Hong, Christos Faloutsos. CHI 2011.

19

Beautiful Hairball

Death Star

Spaghetti

Finding More Relevant Nodes

Apolo uses guilt-by-association

(Belief Propagation)

HCIPaper

Data MiningPaper

Citation network

20

Demo: Mapping the Sensemaking Literature

22

Nodes: 80k papers from Google Scholar (node size: #citation)Edges: 150k citations

Key Ideas (Recap)

Specify exemplars

Find other relevant nodes (BP)

24

What did Apolo go through?

Collection

Cleaning

Integration

Visualization

Analysis

Presentation

Dissemination

Scrape Google Scholar. No API. 😩

Design inference algorithm (Which nodes to show next?)

Paper, talks, lectures

Interactive visualization you just saw

You will a new Apolo prototype (called Argo)

26

Apolo: Making Sense of Large Network Data by Combining Rich User Interaction and

Machine Learning. Duen Horng (Polo) Chau, Aniket Kittur, Jason I. Hong, Christos Faloutsos.

ACM Conference on Human Factors in Computing Systems (CHI) 2011. May 7-12, 2011.

NetProbe:

Fraud Detection in Online Auction

NetProbe: A Fast and Scalable System for Fraud Detection in Online Auction Networks. Shashank Pandit, Duen Horng (Polo)

Chau, Samuel Wang, Christos Faloutsos. WWW 2007

Find bad sellers (fraudsters) on eBay

who don’t deliver their items

NetProbe: The Problem

Buyer

$$$

Seller

28

Non-delivery fraud is a common auction fraud

source: https://www.fbi.gov/contact-us/field-offices/portland/news/press-releases/fbi-tech-tuesday---building-a-digital-defense-against-auction-fraud

29

NetProbe: Key Ideas

Fraudsters fabricate their reputation by

“trading” with their accomplices

Fake transactions form near bipartite cores

How to detect them?

30

NetProbe: Key Ideas

Use Belief Propagation

31

F A H

Fraudster

Accomplice

Honest

Darker means

more likely

NetProbe: Main Results

33

34

“Belgian Police”

35

What did NetProbe go through?

Collection

Cleaning

Integration

Visualization

Analysis

Presentation

Dissemination

Scraping (built a “scraper”/“crawler”)

Design detection algorithm

Not released

Paper, talks, lectures

37

NetProbe: A Fast and Scalable System for Fraud Detection in Online Auction Networks. Shashank

Pandit, Duen Horng (Polo) Chau, Samuel Wang, Christos Faloutsos. International Conference on World Wide

Web (WWW) 2007. May 8-12, 2007. Banff, Alberta, Canada. Pages 201-210.

FONT TELLER

Homework 1 (out next week; tasks subject to change)

• Simple “End-to-end” analysis

• Collect data using API

• Store in SQLite database

• Create graph from data

• Analyze, using SQL queries (e.g.,

create graph’s degree distribution)

• Visualize graph using Gephi

• Describe your discoveries

Collection

Cleaning

Integration

Visualization

Analysis

Presentation

Dissemination