GitHub user imatiach-msft opened a pull request:
https://github.com/apache/spark/pull/19439
[SPARK-21866][ML][PySpark] Adding spark image reader
## What changes were proposed in this pull request?
Adding spark image reader, an implementation of schema for representing
images in spark DataFrames
The code is taken from the spark package located here:
(https://github.com/Microsoft/spark-images)
Please see the JIRA for more information
(https://issues.apache.org/jira/browse/SPARK-21866)
Please see mailing list for SPIP vote and approval information:
(http://apache-spark-developers-list.1001551.n3.nabble.com/VOTE-SPIP-SPARK-21866-Image-support-in-Apache-Spark-td22510.html)
# Background and motivation
As Apache Spark is being used more and more in the industry, some new use
cases are emerging for different data formats beyond the traditional SQL types
or the numerical types (vectors and matrices). Deep Learning applications
commonly deal with image processing. A number of projects add some Deep
Learning capabilities to Spark (see list below), but they struggle to
communicate with each other or with MLlib pipelines because there is no
standard way to represent an image in Spark DataFrames. We propose to federate
efforts for representing images in Spark by defining a representation that
caters to the most common needs of users and library developers.
This SPIP proposes a specification to represent images in Spark DataFrames
and Datasets (based on existing industrial standards), and an interface for
loading sources of images. It is not meant to be a full-fledged image
processing library, but rather the core description that other libraries and
users can rely on. Several packages already offer various processing facilities
for transforming images or doing more complex operations, and each has various
design tradeoffs that make them better as standalone solutions.
This project is a joint collaboration between Microsoft and Databricks,
which have been testing this design in two open source packages: MMLSpark and
Deep Learning Pipelines.
The proposed image format is an in-memory, decompressed representation that
targets low-level applications. It is significantly more liberal in memory
usage than compressed image representations such as JPEG, PNG, etc., but it
allows easy communication with popular image processing libraries and has no
decoding overhead.
## How was this patch tested?
Unit tests in scala ImageSchemaSuite, unit tests in python
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/imatiach-msft/spark ilmat/spark-images
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19439.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19439
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commit 22baf022b2f109bb1f5eba0b13ea34de894cd14c
Author: Ilya Matiach <il...@microsoft.com>
Date: 2017-10-04T21:10:26Z
[SPARK-21866][ML][PySpark] Adding spark image reader
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