What is Exploratory Data Analysis?
Introduction to Sweetviz 2.0
Sweetviz 2.0 is an open-source pandas-based library to perform the primary EDA task without much hassle or with just two lines of code. It also generates a summarised report with great visualizations.
Installation using pip
The basic command to install a package using pip is:
pip install sweetviz
Alternatively, use the following command inside Notebook/Colab
!pip install sweetviz
How to Use?
Let us get our hands dirty and start writing the code… (Feel free to use the source code here)
For this purpose, we will be using the Student Performance dataset (get it here). It is mixed data, that is, both numerical and categorical data are present. The dataset consists of 1000 students record with a total of eight features, viz.,
- gender: categorical
- race/ethnicity: categorical
- parental level of education: categorical
- lunch: categorical
- test preparation course: categorical
- math score: numerical
- reading score: numerical; and
- writing score: numerical
We will be using pandas for reading the csv (Comma Separated Values) file.
# Loading the data data=pd.read_csv('StudentsPerformance.csv') # Printing data insights print(data.info()) # Printing few data samples print(data.head(5))
Sweetviz has a powerful function called analyze() that helps in analyzing the data at a glance.
# Analyzing data report=sv.analyze(data) # Generating report report.show_html('eda_report.html')
Bang! Our report is ready in a split second.
The function show_html() generates a detailed report consisting of the following details:
If show_html() function is not supplied with any parameter, by default, it generates a file named ‘SWEETVIZ_REPORT.html’.
Apart from this, we can compare two datasets side-by-side. To have a glance at this, we would split the dataset into two halves.
# Spliting the data into two datasets data1=data[0:400] data2=data[400:]
Now, let us compare both of them side-by-side using
If the function compare() is left with default parameters, refer to the two datasets by Dataframe and Compared, respectively.
We can also perform target analysis, but currently, it only supports numerical or binary targets, rather than categorical targets. Let’s consider math scores as a target:
report_comp=sv.compare(data1,data2,'math score') report_comp.show_html('Compare_Results.html')
Version 1.0 vs 2.0
Although working with Sweetviz makes EDA hassle-free, it does introduce some difficulties as well.
Firstly, the reports generated using the base OS module; hence it is incompatible with custom environments such as Google Colab. Secondly, the reports are in HTML format; therefore, the graphs cannot be plotted inline.
However, in version 2.0, these issues have been taken care of by a new feature show_notebook() which embeds the visualizations in the notebooks using an iframe. Also, you’ll be able to save a report in HTML format that could be accessed later.
Playing with Reports
The additional yet optional parameters make this task easy.
Version 2.0 allows the user to manipulate the appearance of the report with some parameters as –
report_comp.show_html(filepath='report.html', open_browser=True, layout='vertical', scale=0.7)
Another feature introduced in version 2.0 called show_notebook() displays the report within the notebook environment rather than any browser-based external environment using an IFRAME HTML element. Typical usage of this feature is demonstrated by the following lines of code –
report_comp.show_notebook(w=None, h=None, scale=None, layout='vertical', filepath='E:/sweetviz_report.html')
w and h: signifies the width and height of the window. It can be defined in absolute pixels (e.g. 400) or relatively (e.g. 70%).
filepath: saves the file in the directory with the name specified which can be accessed later
layout: there are two layout modes available, viz., widescreen and vertical
scale: this defines the scale of the report within the window. It is a fractional number ranging from 0 to 1.
In this short article, I outlined how to load data using pandas and have quick insights on the data using Sweetviz 2.0 in just a couple of lines of code.
- https://pypi.org/project/sweetviz/ [accessed: Jan-05-2021]
- https://www.kaggle.com/spscientist/students-performance-in–exams?select=StudentsPerformance.csv [accessed Jan-05-2021]
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