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Learning PySpark

You're reading from   Learning PySpark Build data-intensive applications locally and deploy at scale using the combined powers of Python and Spark 2.0

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Product type Paperback
Published in Feb 2017
Publisher Packt
ISBN-13 9781786463708
Length 274 pages
Edition 1st Edition
Languages
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Authors (2):
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Denny Lee Denny Lee
Author Profile Icon Denny Lee
Denny Lee
Tomasz Drabas Tomasz Drabas
Author Profile Icon Tomasz Drabas
Tomasz Drabas
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Toc

Table of Contents (13) Chapters Close

Preface 1. Understanding Spark 2. Resilient Distributed Datasets FREE CHAPTER 3. DataFrames 4. Prepare Data for Modeling 5. Introducing MLlib 6. Introducing the ML Package 7. GraphFrames 8. TensorFrames 9. Polyglot Persistence with Blaze 10. Structured Streaming 11. Packaging Spark Applications Index

Abstracting data

Blaze can abstract many different data structures and expose a single, easy-to-use API. This helps to get a consistent behavior and reduce the need to learn multiple interfaces to handle data. If you know pandas, there is not really that much to learn, as the differences in the syntax are subtle. We will go through some examples to illustrate this.

Working with NumPy arrays

Getting data from a NumPy array into the DataShape object of Blaze is extremely easy. First, let's create a simple NumPy array: we first load NumPy and then create a matrix with two rows and three columns:

import numpy as np
simpleArray = np.array([
        [1,2,3],
        [4,5,6]
    ])

Now that we have an array, we can abstract it with Blaze's DataShape structure:

simpleData_np = bl.Data(simpleArray)

That's it! Simple enough.

In order to peek inside the structure you can use the .peek() method:

simpleData_np.peek()

You should see an output similar to what is shown in the following screenshot...

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