Dave's In-Class Activity 1 Handout
Created by Dave Song Spring 2023
Community Network Visualization In-class Activity Handout
Original HackMD Handout: HackMD Handout
In-Class Exercise: 30 minutes
Downloads (if you have not already)
Project: Visualizing Community Network in VR
Introduction
Community detection algorithms are used to evaluate how groups of nodes are clustered or partitioned, as well as their tendency to strenthen or break apart.
Examples of Community Detection algorithms
Louvian
Modularity Optimization
Label Propagation
Local Clustering Coefficient
(Optional) if you are interested in Community Detection, feel free to read this article.
Today, we are going to create some community networks in 2D using Gephi and in VR using force directed graphs.
Gephi(7 minutes)
Once you have Gephi and datasets downloaded,
Open Gephi
Click Les Miserables.gexf option on Welcome window displayed.
Click Okay for Import Report page (Note that we are going to work with 77 nodes(characters) and 254 edges).
Once you click, you will see a graph similar to the image below
Navigate to label menu
Click "labels" tab and click again for Node Option.
The size of each node indicated connectedness to other nodes while each comminity has been color coded.
Compare the graph with this character map.
Comment
What’s different/similar/interesting?
Take a screenshot of the Gephi Graph
Generating Graphs with Gephi (7 Minutes)
[STEP1] : if you want to skip this step, feel free to move on to Step 2!
Open a new project
Navigate to Data Laboratory Menu
Click Import Spreadsheet
Find Downloaded File and open DataSet1.
Import **Nodes1.csv **
When you get to Import Report, make sure to click Append to existing workspace option.
Once Nodes1.csv has been imported, click on Edges tab and repeat the same process. This time, we are importing Edges1.csv file.
Now we have 14,115 edges and 1000 nodes!
[Step2]
For time being, we will skip other steps and download InClassActivity.gephi file from here.
Open the Gephi file and explore
Take a screenshot of the graph
Community Force Directed Graph generated in Unity
What is Force Directed Graph?
Three main physical forces:
Repulsion
Springs
Network energy
In the model, nodes are treated like-charged particles that produce a repulsive force that moves them apart.
For this class, I am developing a Unity VR app for Force Directed Graph visualization in VR.
Steps
Step1: SideQuest
If you have completed Lexi’s activity, you should have SideQuest set up ready to download the APK file from the Drive.
If you need to set up SideQuest, follow this tutorial.
Step2: Uploading the file
With your headset connected to your computer, load the .apk file through Sidequest by clicking “install apk file” option.
Step 3: Opening the App
With your headset on, go to Apps and navigate to “Unknown Sources”.You should be able to select the apk file!
Run the project and explore!
Data from Les Miserable
each node has Character Name
You can teleport by pressing left controller trigger
You can turn with both thumb sticks
you can grab and throw objects
Notes
I am still finishing up the project. Therefore, the graph is static for now.
Take a screenshot
