CSE 6242 / CX 4242: Data and Visual Analytics Solved

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HW 1: End-to-end analysis of TMDb data, Argo-Lite, SQLite, D3 Warmup, OpenRefine, Flask
By 32+ awesome TAs of CSE6242A,Q,QSZ,OAN,O01,O3/CX4242A for our 1200+ students
2. Submit a single zipped file, called “HW1-GTusername.zip” that unzips to a folder called “HW1GTusername”, containing all the deliverables including source code/scripts, data files, and readme. Example: “HW1-jdoe3.zip” if GT account username is “jdoe3”. Your GT username is the one with letters and numbers. Only .zip is allowed; no other format will be accepted.
a. At the end of this assignment, we have specified a folder structure that you must use to organize your files. 5 points will be deducted for not following this folder structure strictly.
a. Every homework assignment deliverable comes with a 48-hour “grace period”. You do not need to ask before using this grace period.
c. Canvas automatically appends a “version number” to files that you re-submit. You do not need to worry about these version numbers, and there is no need to delete old submissions. We will only grade the most recent submission.
d. Any deliverable submitted after the grace period will get 0 credit. We recommend that you submit your work before the grace period begins.
e. We will not consider late submission of any missing parts of a deliverable. To make sure you have submitted everything, download your submitted files to double check. If your submitting large files, you are responsible for making sure they get uploaded to the system in time. You have 48 hours to verify your submissions!

Download the HW1 Skeleton before you begin.
Homework Overview
Vast amounts of digital data are generated each day, but raw data are often not immediately “usable.” Instead, we are interested in the information content of the data: what patterns are captured? This assignment covers a few useful tools for acquiring, cleaning, storing, and visualizing datasets.
In Question 1 (Q1), you will collect data using an API for The Movie Database (TMDb). You will construct a graph representation of this data that will show which actors have acted together in various movies, and use Argo Lite to visualize this graph and highlight patterns that you find. This exercise demonstrates how visualizing and interacting with data can help with discovery.
In Q2, you will construct a TMDb database in SQLite, with tables capturing information such as how well each movie did, which actors acted in each movie, and what the movie was about. You will also partition and combine information in these tables in order to more easily answer questions such as “which actors acted in the highest number of movies?”.
In Q3, you will visualize temporal trends in movie releases, using a JavaScript-based library called D3. This part will show how creating interactive rather than static plots can make data more visually appealing, engaging and easier to parse.
Data analysis and visualization is only as good as the quality of the input data. Real-world data often contain missing values, invalid fields, or entries that are not relevant or of interest. In Q4, you will use OpenRefine to clean data from Mercari, and construct GREL queries to filter the entries in this dataset.
Finally, in Q5, you will build a simple web application that displays a table of TMDb data on a single-page website. To do this, you will use Flask, a Python framework for building web applications that allows you to connect Python data processing on the back end with serving a site that displays these results.
Grading and Feedback
The maximum possible score for this homework is 100 points.

1. Every student will receive an email invitation to join Gradescope via the student’s email address listed on Canvas. We expect the invitations will arrive at your inboxes within a few hours after the release of this homework.
Q1 [40 points] Collect data from TMDb and visualize co-actor network
Q1.1 [30 points] Collect data from TMDb and build a graph

For this Q1.1, you will be using and submitting a python file. Complete all tasks according to the instructions found in submission.py to complete the Graph class, the TMDbAPIUtils class, and the two global functions. The Graph class will serve as a re-usable way to represent and write out your collected graph data. The TMDbAPIUtils class will be used to work with the TMDB API for data retrieval.

NOTE: You must only use a version of Python ≥ 3.7.0 and < 3.8 for this question. This question has been developed, tested for these versions. You must not use any other versions (e.g., Python 3.8). While we want to be able to extend to more Python versions, the specified versions are what we can definitively support at this time.

NOTE: You must only use the modules and libraries provided at the top of submission.py and modules from the Python Standard Library. Pandas and Numpy CANNOT be used — while we understand that they are useful libraries to learn, completing this question is not critically dependent on their functionality. In addition, to enable our TAs to provide better, more consistent support to our students, we have decided to focus on the subset of libraries.

a) [10 pts] Implementation of the Graph class according to the instructions in submission.py

b) [10 pts] Implementation of the TMDbAPIUtils class according to the instructions in submission.py. You will use version 3 of the TMDb API to download data about actors and their co-actors. To use the TMDb API:
o Create a TMDb account and obtain your client id / client secret which are required to obtain an authentication Token. Refer to this document for detailed instructions (log in using your GT account).
o Refer to the TMDB API Documentation as you work on this question. The documentation contains a helpful ‘try-it-out’ feature for interacting with the API calls.

c) [10 pts] Producing correct nodes.csv and edges.csv. You must upload your nodes.csv and edges.csv file as directed in Q1.2.

NOTE: Q1.2 builds on the results of Q1.1
Q1.2 [10 points] Visualizing a graph of co-actors using Argo-Lite
Using Argo Lite, visualize a network of actors and their co-actors. You can access Argo Lite here

You will produce an Argo Lite graph snapshot your edges.csv and nodes.csv from Q1.1.c.

a. To get started, review Argo Lite’s readme on GitHub. Argo Lite has been open-sourced.

b. Importing your Graph
● Launch Argo Lite
● From the menu bar, click ‘Graph’ → ‘Import CSV’. In the dialogue that appears:
o Select ‘I have both nodes and edges file’
● Under Nodes, use ‘Choose File’ to select nodes.csv from your computer o Leave ‘Has Headers’ selected o Verify ‘Column for Node ID’ is ‘id’
● Under Edges, use ‘Choose File’ to select edges.csv from your computer o Verify ‘Column for Source ID’ is ‘source’ o Select ‘Column for Target ID’ to ‘target’ o Verify ‘Selected Delimiter’ is ‘,’
● At the bottom of the dialogue, verify that ‘After import, show’ is ‘All Nodes’
● The graph will load in the window. Note that the layout is paused by default; you can select to ‘Resume’ or ‘Pause’ layout as needed.
● Dragging a node will ‘pin’ it, freezing its position. Selecting a pinned node, right clicking it, then choosing ‘unpin selected’ will unpin that node, so its position will once again be computed by the graph layout algorithm. Experiment with pinning and unpinning nodes.

c. [7 points] Setting graph display options
● On “Graph Options” panel, under ‘Nodes’ → ‘Modifying All Nodes’, expand ‘Color’ menu o Select Color by ‘degree’, with scale: ‘Linear Scale’
o Select a color gradient of your choice that will assign lighter colors to nodes with higher node degrees, and darker colors to nodes with lower degrees ● Collapse the ‘Color’ options, expand the ‘Size’ options.
o Select ‘Scale by’ to ‘degree’, with scale: Linear Scale’ o Select meaningful Size Range values of your choice or use the default range.
● Collapse the ‘Size’ options
● On the Menu, click ‘Tools’ → ‘Data Sheet’ ● Within the ‘Data Sheet’ dialogue:
o Click ‘Hide All’
o Set ‘10 more nodes with highest degree’ o Click ‘Show’ and then close the ‘Data Sheet’ dialogue
● Click and drag a rectangle selection around the visible nodes
● With the nodes selected, configure their node visibility by setting the following:
o Go to ‘Graph Options’ → ‘Labels’ o Click ‘Show Labels of Selected Nodes’
o At the bottom of the menu, select ‘Label By’ to ‘degree’
o Adjust the ‘Label Length’ so that the full text of the actor name is displayed
● On the Menu, click ‘Tools’ -> ‘Filters’ -> ‘Show All Nodes’ The result of this workflow yields a graph with the sizing and coloring depending upon the node degree and the nodes with the highest degree are emphasized by showing their labels.

d. [3 points] Designing a meaningful graph layout
Using the following guidelines, create a visually meaningful and appealing layout:
● Reduce as much edge crossing as possible
● Reduce node overlap as much as possible
● Keep the graph compact and symmetric as possible
● Use the nodes’ spatial positions to convey information (e.g., “clusters” or groups)

The objective of this task is to familiarize yourself with basic, important graph visualization features. Therefore, this is an open-ended task, and most designs receive full marks. So please experiment with Argo Lite’s features, changing node size and shape, etc. In practice, it is not possible to create “perfect” visualizations for most graph datasets. The above guidelines are ones that generally help.

If you want to save your Argo Lite graph visualization snapshot locally to your device, so you can continue working on it later, we recommend the following workflow.
● Select ‘Graph’ → ‘Save Snapshot’ o In the ‘Save Snapshot` dialog, click ‘Copy to Clipboard’
o Open an external text editor program such as TextEdit or Notepad. Paste the clipboard contents of the graph snapshot, and save it to a file with a .json extension. You should be able to accomplish this with a default text editor on your computer by overriding the default file extension and manually entering ‘.json’.
● To load a snapshot, choose ‘Graph’ → ‘Open Snapshot’
● Select the graph snapshot you created.

NOTE: Q1.2 (d) will not be graded on Gradescope. We will give a qualitative score on the overall design and presentation of your graph visualization in Argo Lite.

e. Publish and Share your graph snapshot
● Select ‘Graph ‘ → ‘Publish and Share Snapshot’ → ‘Share’
● Next, click ‘Copy to Clipboard’ to copy the generated URL
● Return the URL in the return_argo_lite_snapshot() function in submission.py If you modify your graph after you publish and share a URL, you will need to re-publish and obtain a new URL of your latest graph. Only the graph snapshot shared via the URL will be graded.

Deliverables: Place the files listed below in the Q1 folder.
 submission.py: the completed Python file
Q2 [35 points] SQLite
SQLite is a lightweight, serverless, embedded database that can easily handle multiple gigabytes of data. It is one of the world’s most popular embedded database systems. It is convenient to share data stored in an SQLite database — just one cross-platform file which does not need to be parsed explicitly (unlike CSV files, which have to be parsed).

You will modify the given Q2_SQL.py file by adding SQL statements to it.

NOTE: You must only use a version of Python ≥ 3.7.0 and < 3.8 for this question. This question has been developed, tested for these versions. You must not use any other versions (e.g., Python 3.8)

A Sample class has been provided for you to see some sample SQL statements, you can turn off this output by changing the global variable SHOW to False. NOTE: This must be set to false before uploading to Gradescope and turning it in to Canvas.

GTusername – Please update the method GTusername with your credentials

a. [9 points] Create tables and import data.
i. [2 points] Create two tables (via two separate methods) named movies and movie_cast with
columns having the indicated data types:
1. movies
1. id (integer) 2. title (text)
3. score (real)
2. movie_cast
1. movie_id (integer)
2. cast_id (integer)
3. cast_name (text)
4. birthday (text)
5. popularity (real)

ii. [2 points] Import the provided movies.csv file into the movies table and movie_cast.csv into the movie_cast table
1. You will write Python code that imports the .csv files into the individual tables. This will include looping though the file and using the ‘INSERT INTO’ SQL command. Only use relative paths while importing files since absolute/local paths are specific locations that exist only on your computer and will cause the auto-grader to fail.

iii. [5 points] Vertical Database Partitioning. Database partitioning is an important technique that
1. cast_id (integer)
2. cast_name (text)
4. popularity (real)

i. movie_index for the id column in movies table ii. cast_index for the cast_id column in movie_cast table iii. cast_bio_index for the cast_id column in cast_bio table

c. [3 points] Calculate a proportion. Find the proportion of movies having a score > 50 and that has ‘war’ in the name. Treat each row as a different movie. The proportion should only be based on the total number of rows in the movie table. Format all decimals to two places using printf(). Do NOT use the ROUND() function as it does not work the same on every OS.

Output format and sample value:

d. [4 points] Find the most prolific actors. List 5 cast members with the highest number of movie appearances that have a popularity > 10. Sort the results by the number of appearances in descending order, then by cast_name in alphabetical order.

Output format and sample values (cast_name,appearance_count):
Harrison Ford,2

e. [4 points] Find the highest scoring movies with the smallest cast. List the 5 highest-scoring movies that have the fewest cast members. Sort the results by score in descending order, then by number of cast members in ascending order, then by movie name in alphabetical order. Format all decimals to two places using printf().

Output format and sample values (movie_title,movie_score,cast_count):
Star Wars: Holiday Special,75.01,12 War Games,58.49,33

f. [4 points] Get high scoring actors. Find the top ten cast members who have the highest average movie scores. Format all decimals to two places using printf().
▪ Sort the output by average score in descending order, then by cast_name in alphabetical order.
▪ Do not include movies with score <25 in the average score calculation. ▪ Exclude cast members who have appeared in two or fewer movies.

Output format and sample values (cast_id,cast_name,average_score):
8822,Julia Roberts,53.00
g. [6 points] Creating views. Create a view (virtual table) called good_collaboration that lists pairs of actors who have had a good collaboration as defined here. Each row in the view describes one pair of actors who appeared in at least 3 movies together AND the average score of these movies is >= 40.

The view should have the format: good_collaboration( cast_member_id1, cast_member_id2, movie_count, average_movie_score)

For symmetrical or mirror pairs, only keep the row in which cast_member_id1 has a lower numeric value. For example, for ID pairs (1, 2) and (2, 1), keep the row with IDs (1, 2). There should not be any “self pair” where the value of cast_member_id1 is the same as that of cast_member_id2.

NOTE: Full points will only be awarded for queries that use joins for part g.

Remember that creating a view will not produce any output, so you should test your view with a few simple select statements during development. One such test has already been added to the code as part of the auto-grading.

Optional Reading: Why create views?

• Sort your output by this score in descending order, then by cast_name alphabetically.
Output format (cast_id,cast_name,collaboration_score):
2,Mark Hamil,99.32
1920,Winoa Ryder,88.32

h. [4 points] SQLite supports simple but powerful Full Text Search (FTS) for fast text-based querying (FTS documentation). Import movie overview data from the movie_overview.csv into a new FTS table called movie_overview with the schema:

▪ id (integer)
▪ overview (text)

NOTE: Create the table using fts3 or fts4 only. Also note that keywords like NEAR, AND, OR and NOT are case sensitive in FTS queries.

i. [1 point] Count the number of movies whose overview field contains the word ‘fight’. Matches are not case sensitive. Match full words, not word parts/sub-strings.
e.g., Allowed: ‘FIGHT’, ‘Fight’, ‘fight’, ‘fight.’. Disallowed: ‘gunfight’, ‘fighting’, etc.

Output format:
ii. [2 points] Count the number of movies that contain the terms ‘space’ and ‘program’ in the overview field with no more than 5 intervening terms in between. Matches are not case sensitive. As you did in h(i)(1), match full words, not word parts/sub-strings. e.g., Allowed: ‘In Space there was a program’, ‘In this space program’. Disallowed: ‘In space you are not subjected to the laws of gravity. A program.’, etc.

Output format:

Deliverables: Place all the files listed below in the Q2 folder

1. Q2_SQL.py: Modified file containing all the SQL statements you have used to answer parts a – h in the proper sequence.

Q3 [15 points] D3 (v5) Warmup

NOTE the following important points:

1. We highly recommend that you use the latest Firefox browser to complete this question. We will grade your work using Firefox 79.0 (or newer).

2. For this homework, the D3 library is provided to you in the lib folder. You must NOT use any D3 libraries (d3*.js) other than the ones provided.

5. All d3*.js files in the lib folder are referenced using relative paths in your html file. For example, since the file “Q3/index.html” uses d3, its header contains:
<script type=”text/javascript” src=”lib/d3/d3.min.js”></script> It is incorrect to use an absolute path such as:
<script type=”text/javascript” src=”http://d3js.org/d3.v5.min.js”></script>

The 3 files that are referenced are:
– lib/d3/d3.min.js
– lib/d3-dsv/d3-dsv.min.js – lib/d3-fetch/d3-fetch.min.js

6. For a question that reads in a dataset, you are required to submit the dataset too (as part of your deliverable). In your html / js code, use a relative path to read in the dataset file. For example, since Q3 requires reading data from the q3.csv file, the path should be ‘q3.csv’ and NOT an absolute path such as “C:/Users/polo/HW1-skeleton/Q3/q3.csv”. Absolute/local paths are specific locations that exist only on your computer, which means your code will NOT run on our machines when we grade (and you will lose points).

7. You can and are encouraged (though not required) to decouple the style, functionality and markup in the code for each question. That is, you can use separate files for CSS, JavaScript and HTML — this is a good programming practice in general.

Deliverables: Place all the files/folders listed below in the Q3 folder

● A folder named lib containing folders d3, d3-fetch, d3-dsv
● q3.csv: the file that we have provided you, in the hw1 skeleton under Q3 folder, which contains the data that will be loaded into the D3 plot.
● index.(html / css / js) : when run in a browser, it should display a barplot with the following specifications:
a. [1.5 points] Load the data from q3.csv using D3 fetch methods. We recommend d3.dsv().
b. [2 points] The barplot must display one bar per row in the q3.csv dataset. Each bar corresponds to the running total of movies for a given year. The height of each bar represents the running total. The bars are ordered by ascending time with the earliest observation at the far left. i.e., 1880, 1890, …, 2000
c. [1 point] The bars must have the same fixed width, and there must be some space between two bars, so that the bars do not overlap.
d. [3 points] The plot must have visible X and Y axes that scale according to the generated bars. That is, the axes are driven by the data that they are representing. Likewise, the ticks on these axes must adjust automatically based on the values within the datasets, i.e., they must not be hard-coded.
e. [2 point] Set x-axis label to ‘Year’ and y-axis label to ‘Running Total’.
f. [1 point] Use a linear scale for the Y axis to represent the running total (recommended function: d3.scaleLinear()).
g. [3 points] Use a time scale for the X axis to represent year (recommended function:
h. [1 point] Set the HTML title tag and display a title for the plot.
■ Position the title “Running Total of TMDb Movies by Year” above the barplot.
■ Set the HTML title tag (i.e., <title> Running Total of TMDb Movies by Year </title>).
i. [0.5 points] Add your GT username (usually includes a mix of letters and numbers) to the area beneath the bottom-right of the plot (see example image).

The barplot should appear similar in style to the sample data plot provided below.

Q4 [5 points] OpenRefine
OpenRefine is a Java application and requires Java JRE to run. Download and install Java if you do not have it (you can verify by typing ‘java -version’ in your computer’s terminal or command prompt).

a. Watch the videos on OpenRefine’s homepage for an overview of its features. Then, download and install OpenRefine release 3.3. Do not use version 3.4 (which is in beta status).

b. Import Dataset
● Run OpenRefine and point your browser at
● We use a products dataset from Mercari, derived from a Kaggle competition (Mercari Price Suggestion Challenge). If you are interested in the details, visit the data description page. We have sampled a subset of the dataset provided as “properties.csv”.
● Choose “Create Project” → This Computer → properties.csv”. Click “Next”.
● You will now see a preview of the data. Click “Create Project” at the upper right corner.

c. Clean/Refine the data

NOTE: OpenRefine maintains a log of all changes. You can undo changes. Use the “Undo/Redo” button at the upper left corner. Follow the exact output format specified in every part below.

i. [0.5 point] Select the category_name column and choose ‘Facet by Blank’ (Facet → Customized
Facets → Facet by blank) to filter out the records that have blank values in this column. Provide the number of rows that return True in Q4Observations.txt. Exclude these rows.

Output format and sample values:
i.rows: 500

ii. [1 point] Split the column category_name into multiple columns without removing the original column. For example, a row with “Kids/Toys/Dolls & Accessories” in the category_name column would be split across the newly created columns as “Kids”, “Toys” and “Dolls & Accessories”. Use the existing functionality in OpenRefine that creates multiple columns from an existing column based on a separator (i.e., in this case ‘/’) and does not remove the original category_name column. Provide the number of new columns that are created by this operation, excluding the original category_name column.

Output format and sample values:
ii.columns: 10

NOTE: There are many possible ways to split the data. While we have provided one way to accomplish this in step ii, some methods could create columns that are completely empty. In this dataset, none of the new columns should be completely empty. Therefore, to validate your output, we recommend that you verify that there are no columns that are completely empty, by sorting and checking for null values.
iii. [0.5 points] Select the column name and apply the Text Facet (Facet → Text Facet). Cluster by using (Edit Cells → Cluster and Edit …) this opens a window where you can choose different “methods” and “keying functions” to use while clustering. Choose the keying function that produces the smallest number of clusters under the “Key Collision” method. Click ‘Select All’ and ‘Merge Selected & Close’. Provide the name of the keying function and the number of clusters that was produced.

Output format and sample values: iii.function: fingerprint, 200

NOTE: Use the default Ngram size when testing Ngram-fingerprint.

iv. [1 point] Replace the null values in the brand_name column with the text “Unknown” (Edit Cells > Transform). Provide the General Refine Evaluation Language (GREL) expression used.

Output format and sample values:
iv.GREL_categoryname: endsWith(“food”, “ood”)

v. [1 point] Create a new column high_priced with the values 0 or 1 based on the “price” column with the following conditions: if the price is greater than 90, high_priced should be set as 1, else
0. Provide the GREL expression used to perform this.

Output format and sample values:
v.GREL_highpriced: endsWith(“food”, “ood”)

vi. [1 point] Create a new column has_offer with the values 0 or 1 based on the
item_description column with the following conditions: If it contains the text “discount” or “offer” or “sale”, then set the value in has_offer as 1, else 0. Provide the GREL expression used to perform this. Convert the text to lowercase before you search for the terms.

Output format and sample values:
vi.GREL_hasoffer: endsWith(“food”, “ood”)

Deliverables: Place all the files listed below in the Q4 folder
● properties_clean.csv : Export the final table as a comma-separated values (.csv) file.
● changes.json : Submit a list of changes made to file in json format. Use the “Extract Operation History” option under the Undo/Redo tab to create this file.
● Q4Observations.txt : A text file with answers to parts c.i, c.ii, c.iii, c.iv, c.v, c.vi. Provide each answer in a new line in the exact output format specified. Your file’s final formatting should result in a .txt file that has each answer on a new line followed by one blank line (to help visually separately the answers)

Q5 [5 points] Introduction to Python Flask
Flask is a lightweight web application framework written in Python that provides you with tools, libraries and technologies to quickly build a web application. It allows you to scale up your application as needed.

You will modify the given file:
• wrangling_scripts/wrangling.py

NOTE: You must only use a version of Python ≥ 3.7.0 and < 3.8 for this question. This question has been developed, tested for these versions. You must not use any other versions (e.g., Python 3.8).

NOTE: You must only use the modules and libraries provided at the top of submission.py and modules from the Python Standard Library (except Flask). Pandas and Numpy CANNOT be used — while we understand that they are useful libraries to learn, completing this question is not critically dependent on their functionality. In addition, to enable our TAs to provide better, more consistent support to our students, we have decided to focus on the subset of libraries.

Username()- Update the username() method inside wrangling.py by including your GTUsername.

• Get started by installing Flask on your machine by running pip install Flask (Note that you can optionally create a virtual environment by following the steps here. Creating a virtual environment is purely optional and can be skipped.)

• To run the code, you must navigate to the Q5 folder in your terminal/command prompt and execute the following command: python run.py. After running the command go to on your browser. This will open up index.html showing a table in which the rows returned by data_wrangling() are displayed.

• You must solve the following 2 sub-questions:
a. [2 points] Read the top 100 rows using the data_wrangling() method.

NOTE: The skeleton code by default reads all the rows from movies.csv. You must add the required code to ensure reading only the first 100 rows. The skeleton code already handles reading the table header for you.

b. [3 points]: Sort the table in descending order of the values i.e., with larger values at the top and smaller values at the bottom of the table in the last (3rd) column.

Deliverables: Place the file listed below in the Q5 folder
● wrangling.py : Submit wrangling.py file with your changes.
Extremely Important: folder structure & content of submission zip file

You are submitting a single zip file named HW1-GTusername.zip (e.g., HW1-jdoe3.zip).

The files included in each question’s folder have been clearly specified at the end of the question’s problem description.

The zip file’s folder structure must exactly be (when unzipped):

Q1/ submission.py
Q3/ index.(html / js / css) q3.csv lib/ d3/ d3.min.js
d3-fetch/ d3-fetch.min.js
Q4/ properties_clean.csv changes.json Q4Observations.txt
Q5/ wrangling.py


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