Big Data Analysis with PySpark | Sample Assignment.

Updated: Jan 29


BACKGROUND: INCOME CLASSIFIER

Census data is one of the largest sources of a variety of statistical information related to population. It typically includes information related to Age, Gender, Household composition, Employment Details, Accommodation Details, and so on. Till recent years, collecting census data has been a manual process involving field visits and registrations. With advances in technology, the methods of collecting this data have improved to a great extent. And so is the population! With a population of more than 7 billion, one can imagine the volume of the census data associated with it. This data is collected from a variety of sources such as manual entries, online surveys, data from social media and search engines and is in various formats. Traditional database systems are inefficient at

handling such data. This is where Big Data Technologies come into picture.


As per a study by U.S. Census Bureau, analytics on census data could have been helpful during the Great Recession in various ways such as avoiding job loss in Supply-Chain businesses, reducing housing foreclosure rates, and so on.


Big Data Analytics refers to a set of tools and methods used to obtain knowledge from information.


Application of Big Data Analytics on census data can facilitate better decision making in various Government and Industrial sectors such as Healthcare, Education, Finance, Retail, and Housing. One such application is an Income Classifier. In this project, let us take a sample of world census data and build an Income Classifier using various Big Data Techniques described in subsequent sections.


LEARNING OBJECTIVES

1. HDFS and Hive for Data Storage and Management

2. Data Ingestion using Sqoop

3. Machine Learning using PySpark

This Project is divided into three parts to cover the above learning objectives.


DATASET

The dataset named censusdata.csv is provided in your LMS. We will be using the same dataset for all the three parts.

  • Input: The dataset contains 15 columns

  • Targeted Column: Income; the income is provided in the form of two values: < 50k or >50k

  • Number of other columns:14; these are demographics and other features used for describing a person

List of Attributes:

age: continuous

workclass: Private, Self-emp-not-inc, Self-emp-inc, Federal-gov, Local-gov, State-gov,

Without-pay, Never-worked

fnlwgt: continuous.

education: Bachelors, Some-college, 11th, HS-grad, Prof-school, Assoc-acdm, Assoc-voc, 9th, 7th-8th, 12th, Masters, 1st-4th, 10th, Doctorate, 5th-6th, Preschool education-num: continuous

marital-status: Married-civ-spouse, Divorced, Never-married, Separated, Widowed, Married-spouse-absent, Married-AF-spouse

occupation: Tech-support, Craft-repair, Other-service, Sales, Exec-managerial, Prof- specialty, Handlers-cleaners, Machine-op-inspct, Adm-clerical, Farming-fishing, Transport-moving, Priv-house-serv, Protective-serv, Armed-Forces

relationship: Wife, Own-child, Husband, Not-in-family, Other-relative, Unmarried

race: White, Asian-Pac-Islander, Amer-Indian-Eskimo, Other, Black

sex: Female, Male

capital-gain: continuous

capital-loss: continuous

hours-per-week: continuous

native-country: United-States, Cambodia, England, Puerto-Rico, Canada, Germany, Outlying-US(Guam-USVI-etc), India, Japan, Greece, South, China, Cuba, Iran, Honduras, Philippines, Italy, Poland, Jamaica, Vietnam, Mexico, Portugal, Ireland, France, Dominican-Republic, Laos, Ecuador, Taiwan, Haiti, Columbia, Hungary, Guatemala, Nicaragua, Scotland, Thailand, Yugoslavia, El-Salvador, Trinadad&amp;Tobago, Peru, Hong, Holand-Netherlands

income: >50K, <=50K


TASKS

1. HDFS AND HIVE

Problem Statement 1

Census Analytics is a project where you need to collect the data of people along with their incomes.


As the census data is usually in large volume, the analysis of the data will be a cumbersome task. To overcome this, we will be using the Hadoop Ecosystem.

As a first step, you need to load the data into HDFS and create a table in Hive that can be used for querying the data. You have to create different types of tables and execute queries, as mentioned below and compare the time required for execution for different types of tables.


Steps to be performed:

1. Download the dataset named censusdata.csv that is provided in your LMS

2. Load the downloaded data into HDFS

3. Create an internal table in Hive to store the data

a. Create the table structure

b. Load the data from HDFS into the Hive table


4. Create an internal table in Hive with partitions

a. Create a Partition Table in Hive using “workclass” as the Partition Key

b. Load data from the staging table (Table created in Step 3) into this table


5. Create an external table in Hive to hold the same data stored in HDFS

6. Create an external table in Hive with partitions using “workclass” as Partition Key

7. For each of the four tables created above, perform the following operations


Find out the number of adults based on income and gender. Note the time taken for getting the result


Find out the number of adults based on income and workclass. Note the time taken for

getting the result


Write your observations by comparing the time taken for executing the commands

between:

a. Internal &amp; External Tables

b. Partitioned &amp; Non-partitioned Tables


8. Delete the internal as well as external tables. Comment on the effect on data and metadata after the deletion is performed for both internal and external tables.


2. DATA INGESTION

Problem Statement 2

In a similar scenario as above, the data is available in a MySQL database. Due to the inefficiency of RDBMS systems to store and analyze Big Data, it is recommended that we move the data to the Hadoop Ecosystem.


Ingest the data from MySQL database into Hive using Sqoop. Data pipeline needs to be created to ingest data from an RDBMS into Hadoop Cluster and then load data into Hive.

To make the analysis faster, use Spark on top of Hive after getting data into the Hadoop cluster.

Using Spark, query different tables from Hive to analyze the dataset.


Steps to be performed:


1. Create the necessary structure in a MySQL database using the steps mentioned below:

a. Create a new database in MySQL with the name midproject

b. Create a table in this database with the name census_adult to store the input dataset

c. Load the dataset into the table

d. Verify whether data is loaded properly

e. Verify the table for unwanted data such as ‘?’,’Nan’ and ‘Null’

f. Get the counts for the columns which contain unwanted data

g. Clean the data by replacing the unwanted data with others


2. Import the above data from MySQL into a Hive table using Sqoop

3. Connect to PySpark using web console to access the created Hive table. Perform the following queries and note the time taken for execution in each of the queries.


a. Query the table to get the number of adults based on income and gender

b. Query the table to get the number of adults based on income and workclass


Hint: To access Hive tables using Spark console, use the following commands:


>>pyspark2
>>from pyspark.context import SparkContext
>>from pyspark.sql import HiveContext
>>sqlContext = HiveContext(sc)

4. Access the following two tables created as part of Problem 1 (HDFS and Hive) and

perform the steps as mentioned below:


a. Access Hive External Table with partition

i. Query the table to get the number of adults based on income and gender

ii. Query the table to get the number of adults based on income and workclass

b. Access Hive Internal Table with Partition

i. Query the table to get the number of adults based on income and gender

ii. Query the table to get the number of adults based on income and workclass


Make a note of the time taken for getting the result in comparison with the time taken to get results with Hive.


5. Comment on the time taken for executing these commands using Spark as compared to the time taken for execution in Hive (Problem Statement 1).


3. INCOME CLASSIFIER

Problem Statement 3

Income Classifier is an application that will be used to classify individuals based on the annual income. An individual’s annual income may be influenced by various factors such as age, gender, occupation, education level, and so on.


Write a program to build classification models using PySpark. Explore the possibility of classifying income based on an individual’s personal information. Perform the following steps to build and compare different classifiers. Use Jupyter Notebook to write the program.


Steps to be performed:

1. Load data using PySpark

2. Perform Exploratory Data Analysis (EDA) and Data Cleaning based on the following points:

a. Find the shape and schema of the dataset

b. Obtain insights (statistics) of different columns

c. Obtain the Unique values of Categorical Columns

d. Check if any unwanted values are present in the data such as Null, ? or NaN

e. Remove unwanted values if present in any of the columns (numerical as well as

categorical columns)

f. Obtain the relationship between different columns using covariance which shows the degree of interdependence of the two columns

g. Obtain distinct values and their counts in categorical columns.

h. Create a crosstab on two different columns (example, age &amp; workclass)

i. Perform an “Integer Type Check” on the columns of the Spark DataFrame and display the columns satisfying the same

j. Obtain correlation between the above columns using pandas scatter plot


3. Data Preprocessing

Since we are going to use classification algorithms like Logistic Regression, we will have to convert all the categorical columns in the dataset to numerical values. We can achieve this using

1) Category Indexing

In this, we assign a numerical value to each category (eg: Male: 0, Female: 1)


2) One-Hot Encoding

a. Conversion of categorical columns into Numerical Columns

i. Category Indexing using string indexing for all categorical columns

ii. Label Indexing for income column as income_class

iii. One Hot Encoding which generates binary columns for features

iv. Use Vector assembler to get a single vector column for features

v. Make it as an array of stages so that it can be passed to a pipeline


This converts categories into binary vectors with at most one nonzero value (eg: (Blue: [1, 0]), (Green: [0, 1]), (Red: [0, 0]))


In this step, we will be using a combination of Category Indexing and One-Hot Encoding

(Note: Make sure that the output column name for Income should be income_class)


4. Build the Pipeline to perform multiple tasks

a. Pass the stages of Data Preprocessing (created in Step 3) to the pipeline to create an instance with the stages

b. Estimator that can fit on a DataFrame to produce a model

c. Transform the DataFrame with features to DataFrame with predictions

d. Generate a DataFrame which can hold a variety of datatypes including feature vectors


5. Split the dataset into two parts (80%-20%) as Train and Test Datasets

a. Check the shape of the datasets

b. Check the distribution of income class (0,1) in train and test dataset


6. Build the following Classifiers

a. Logistic Regression

b. Decision Tree

c. Random Forest

d. Gradient Boosted Tree

e. Naïve Bayes


Common Tasks for all the Classifiers:

  • Train and Evaluate the Model

  • Print ROC metrics &amp; model accuracy

  • Tune the Hyperparameters and print the improved accuracy

Compare the accuracy of the 5 models and comment on the models which performed better as compared to other in the list.




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