Big data HPC Convergence-Dr. Amin-Nezarat-(aminnezarat@gmail.com)-2019
1. ماشینی یادگیری مبانی
Big Data & HPC Convergence Era
Amin Nezarat (Ph.D.)
Assistant Professor at Payame Noor University
aminnezarat@gmail.com www.astek.ir - www.hpclab.ir
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• Tom Mitchell (1998): A computer program is said to learn from experience with respect to
some task and some performance measure , if its performance on , as measured by ,
improves with experience.
• Ethem Alpaydın (2010): Machine learning is programming computers to optimize a
performance criterion using example data or past experience.
• Traditional programming versus machine learning:
ماشینی یادگیری تعریف
33. Big Data Stack
Apache Hadoop is an open source software framework
for storage and large scale processing of data-sets on
clusters of commodity hardware
Hadoop was created by Doug Cutting and Mike
Cafarella in 2005, Named the project after son's toy
elephant
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� Knowledge is not concrete
� Spam is an abstraction
� Face is an abstraction
� Who to lend to is an abstraction
You do not find spam, faces, and financial advice in datasets, you
just find bits!
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� Classification and regression (supervised learning)
� Clustering (unsupervised learning)
� Mining the frequent patterns
� Outlier detection
Validation&Functionality
� Needs to evaluate the performance of the model on some criteria.
� Depends on the application and its requirements.
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• What is Spark ?
High level Architecture
How does it Work ? RDD and Operations Hadoop MapReduce
DAG (Directed Acyclic Graph) Run Mode of Spark Programming model
• Machine Learning With Spark
MLLib Library
Types of Machine Learning MLArchitecture
Comparison with other tools
• Other Applications
What is Spark?
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• Definition
“Apache Spark is an open source big data processing framework built around
speed, ease of use, and sophisticated analytics. It was originally
developed in 2009 in UC Berkeley’s AMPLab, and open sourced in
2010 as an Apache project.”
Source : http://www.infoq.com/articles/apache-spark-introduction
What is Spark?
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• Definition
“A Resilient Distributed Dataset (RDD), the basic
abstraction in Spark. Represents an immutable,
partitioned collection of elements that can be
operated on in parallel. This class contains the basic
operations available on all RDD”
Source : http://spark.apache.org/docs/0.6.2/api/core/spark/RDD.html
RDDآن عملیاتهای و
• Creating RDD:
From existing collection
From Hadoop-based input sources
valcollection=List("a","b","c", "d")
valrddFromCollection=sc.parallelize (collection)
valrddFromTextFile=sc.textFile("List ")
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• Definition
“The term MapReduce actually refers to two separate and distinct tasks
that Hadoop programs perform. The first is the map job … and the
second is the reduce.”
Source: https://www-01.ibm.com/software/data/infosphere/hadoop/mapreduce/
نویسی برنامه مدلMap/Reduce
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• MLLib Library :
“MLlib is Spark’s scalable machine learning library consisting of
common learning algorithms and utilities, including classification,
regression, clustering, collaborative filtering, dimensionality
reduction, as well as underlying optimization Primitives”
Source: https://spark.apache.org
Spark Machine Learning
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Algorithms:
• classification: logistic regression, linear support vector machine
(SVM), naive Bayes
• regression: generalized linear regression (GLM)
• collaborative filtering: alternating least squares (ALS)
• clustering: k-means
• decomposition: singular value decomposition (SVD), principal
component analysis (PCA)
MLLibچیست؟
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• It is built on Apache Spark, a fast and general
engine for large-scale data processing.
• Run programs up to 100x faster than
Hadoop MapReduce in memory, or
10x faster on disk.
• Write applications quickly in Java, Scala, or Python.
Why MLlib
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• Data Ingestion:
- Browser, and mobile application event logs or accessing external
webAPIs
• Data Storage:
- HDFS, Amazon S3, and other filesystems; SQL databases such
as MySQL or PostgreSQL; distributed NoSQL data stores such as
HBase, Cassandra, and DynamoDB, …
Data Ingestion and Storage
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• Master loads (small) data file and
initializes models.
• Master broadcasts data and initial
models.
• At each iteration, updated models are
broadcast again.
• Works OK for small data.
• Lots of communication overhead - doesn’t
scale well.
Broadcast Everything
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Workers load data•
• Master broadcasts initial models
• At each iteration, updated models are
broadcast again
Much better scaling•
• Works on large datasets
• Works well for smaller models. (low K)
workers
Data Parallel
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Workers load data
Models are instantiated
at workers.
• At each iteration, models are shared
via join between workers.
• Much better
scalability.
• Works on large datasets
•
•
Fully Parallel
workers
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Single Instruction, Single Data (SISD)
•A serial (non-parallel) computer
•Single Instruction: Only one instruction stream is
being acted on by the CPU during any one clock
cycle
•Single Data: Only one data stream is being used as
input during any one clock cycle
•Deterministic execution
•This is the oldest type of computer
•Examples: older generation mainframes,
minicomputers, workstations and single
processor/core PCs.
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Single Instruction, Multiple Data (SIMD)
• A type of parallel computer
• Single Instruction: All processing units execute the same
instruction at any given clock cycle
• Multiple Data: Each processing unit can operate on a
different data element
• Two varieties: Processor Arrays and Vector Pipelines
• Examples:
• Processor Arrays: Thinking Machines CM-2, MasPar
MP-1 & MP-2, ILLIAC IV
• Vector Pipelines: IBM 9000, Cray X-MP, Y-MP & C90,
Fujitsu VP, NEC SX-2, Hitachi S820, ETA10
• Most modern computers, particularly those with graphics
processor units (GPUs) employ SIMD instructions and
execution units.
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Multiple Instruction, Single Data (MISD)
•A type of parallel computer
•Multiple Instruction: Each processing unit operates
on the data independently via separate instruction
streams.
•Single Data: A single data stream is fed into multiple
processing units.
•Few (if any) actual examples of this class of parallel
computer have ever existed.
•Some conceivable uses might be:
•multiple frequency filters operating on a single
signal stream
•multiple cryptography algorithms attempting to
crack a single coded message.
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Multiple Instruction, Multiple Data (MIMD)
• A type of parallel computer
• Multiple Instruction: Every processor may be executing a
different instruction stream
• Multiple Data: Every processor may be working with a
different data stream
• Execution can be synchronous or asynchronous, deterministic
or non-deterministic
• Currently, the most common type of parallel computer - most
modern supercomputers fall into this category.
• Examples: most current supercomputers, networked parallel
computer clusters and "grids", multi-processor SMP
computers, multi-core PCs.
• Note: many MIMD architectures also include SIMD execution
sub-components