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The Data Science Workshop

You're reading from   The Data Science Workshop A New, Interactive Approach to Learning Data Science

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Product type Paperback
Published in Jan 2020
Publisher
ISBN-13 9781838981266
Length 818 pages
Edition 1st Edition
Languages
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Authors (5):
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Thomas Joseph Thomas Joseph
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Thomas Joseph
Andrew Worsley Andrew Worsley
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Andrew Worsley
Robert Thas John Robert Thas John
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Robert Thas John
Anthony So Anthony So
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Anthony So
Dr. Samuel Asare Dr. Samuel Asare
Author Profile Icon Dr. Samuel Asare
Dr. Samuel Asare
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Toc

Table of Contents (18) Chapters Close

Preface 1. Introduction to Data Science in Python 2. Regression FREE CHAPTER 3. Binary Classification 4. Multiclass Classification with RandomForest 5. Performing Your First Cluster Analysis 6. How to Assess Performance 7. The Generalization of Machine Learning Models 8. Hyperparameter Tuning 9. Interpreting a Machine Learning Model 10. Analyzing a Dataset 11. Data Preparation 12. Feature Engineering 13. Imbalanced Datasets 14. Dimensionality Reduction 15. Ensemble Learning 16. Machine Learning Pipelines 17. Automated Feature Engineering

Creating a High-Dimensional Dataset

In the earlier section, we worked with a dataset that has around 1,558 features. In order to demonstrate the challenges with high-dimensional datasets, let's create an extremely high dimensional dataset from the internet dataset that we already have.

This we will achieve by replicating the existing number of features multiple times so that the dataset becomes really large. To replicate the dataset, we will use a function called np.tile(), which copies a data frame multiple times across the axes we want. We will also calculate the time it takes for any activity using the time() function.

Let's look at both these functions in action with a toy example.

You begin by importing the necessary library functions:

import pandas as pd
import numpy as np

Then, to create a dummy data frame, we will use a small dataset with two rows and three columns for this example. We use the pd.np.array() function to create a data frame:

# Creating...
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