1 Introduction to Big Data! with Apache Spark" UC#BERKELEY#
2 So What is Data Science?" Doing Data Science" Data Preparation" Roles" This Lecture"
3 What is Data Science?" Data Science aims to derive knowledge! from big data, efficiently and intelligently" Data Science encompasses the set of! activities, tools, and methods that! enable data-driven activities in science,! business, medicine, and government " "
4 Data Science One Definition" Machine" Learning" Data" Science" Domain" Expertise" "
5 Element" Databases" Data Science" Data Value" Precious " Cheap " Data Volume" Modest" Massive" Examples" Priorities" Bank records, Personnel records, Census, Medical records" Consistency, Error recovery, Auditability" Contrast: Databases" Online clicks, GPS logs, Tweets, tree sensor readings" Speed, Availability, Query richness" Structured" Strongly (Schema)" Weakly or none (Text)" Properties" Transactions, ACID +" CAP * theorem (2/3), eventual consistency" Realizations" Structured Query Language (SQL)" * CAP = Consistency, Availability, Partition Tolerance" + ACID = Atomicity, Consistency, Isolation and Durability" NoSQL: Riak, Memcached, Apache Hbase, Apache River, MongoDB, Apache Cassandra, Apache CouchDB,, "
6 Contrast: Databases" Databases" Querying the past" Data Science" Querying the future" Related Business Analytics"» Goal: obtain actionable insight in complex environments"» Challenge: vast amounts of disparate, unstructured data and limited time"
7 Contrast: Scientific Computing" Image" General purpose ML classifier" Supernova" Not" Dr Peter Nugent (C3 LBNL)" Scientific Modeling" Data-Driven Approach" Physics-based models" General inference engine replaces model" Problem-Structured" Structure not related to problem" Mostly deterministic, precise" Statistical models handle true randomness, and unmodeled complexity" Run on Supercomputer or High-end Computing Cluster" Run on cheaper computer Clusters (EC2)"
8 Contrast: Traditional Machine Learning" Traditional Machine Learning" Develop new (individual) models" Prove mathematical properties of models" Improve/validate on a few, relatively clean, small datasets" Publish a paper" Data Science" Explore many models, build and tune hybrids" Understand empirical properties of models" Develop/use tools that can handle massive datasets" Take action!"
9 Recent Data Science Competitions" Using Data Science to find Data Scientists!"
10 Doing Data Science" The views of three Data Science experts"» Jim Gray (Turing Award winning database researcher)"» Ben Fry (Data visualization expert)"» Jeff Hammerbacher (Former Facebook Chief Scientist, Cloudera co-founder)" Cloud computing: Data Science enabler" 13"
11 Data Science One Definition" Machine" Learning" Data" Science" Domain" Expertise" "
12 Jim Gray s Model " 1. Capture" 2. Curate" 3. Communicate" Turing award winner" 15"
13 Ben Fry s Model " 1. Acquire" 2. Parse" 3. Filter" 4. Mine" 5. Represent" 6. Refine" 7. Interact" Data visualization expert" 16"
14 Jeff Hammerbacher s Model" 1. Identify problem" 2. Instrument data sources" 3. Collect data" 4. Prepare data (integrate, transform,! clean, filter, aggregate)" 5. Build model" 6. Evaluate model" 7. Communicate results" Facebook, Cloudera" 17"
15 Key Data Science Enabler: Cloud Computing" Cloud computing reduces computing operating costs" Cloud computing enables data science on massive numbers of inexpensive computers " Figure:
16 The Million-Server Data Center" "
17 Data Scientist s Practice" Clean, prep" Large Scale Exploitation" Digging Around! in Data" Hypothesize Model" Evaluate! Interpret"
18 Data Science Topics" Data Acquisition" Data Preparation" Analysis" Data Presentation" Data Products" Observation and Experimentation"
19 What s Hard about Data Science?" Overcoming assumptions" Making ad-hoc explanations of data patterns" Not checking enough (validate models, data pipeline integrity, etc.)" Overgeneralizing" Communication" Using statistical tests correctly" Prototype! Production transitions" Data pipeline complexity (who do you ask?)"
20 Data Science One Definition" Machine" Learning" Data" Science" Domain" Expertise" "
21 Extract Transform Load The Big Picture"
22 Data Acquisition (Sources)! in Web Companies" Examples from Facebook"» Application databases"» Web server logs"» Event logs"» Application Programming Interface (API)! server logs"» Ad and search server logs"» Advertisement landing page content"» Wikipedia"» Images and video"
23 Data Acquisition & Preparation Overview" Extract, Transform, Load (ETL)"» We need to extract data from the source(s)"» We need to load data into the sink"» We need to transform data at the source, sink, or in a staging area"» Sources: file, database, event log, web site,! Hadoop Distributed FileSystem (HDFS), "» Sinks: Python, R, SQLite, NoSQL store, files,! HDFS, Relational DataBase Management System! (RDBMS), "
24 Data Acquisition & Preparation! Process Model" The construction of a new data preparation process is done in many phases"» Data characterization"» Data cleaning"» Data integration" We must efficiently move data around in! space and time"» Data transfer"» Data serialization and deserialization (for files or! network)"
25 Data Acquisition & Preparation Workflow" The transformation pipeline or workflow often consists of many steps"» For example: Unix pipes and filters"» cat$data_science.txt$ $wc$ $mail$1s$"word$count If a workflow is to be used more than once, it can be scheduled"» Scheduling can be time-based or event-based"» Use publish-subscribe to register interest (e.g., Twitter feeds)" Recording the execution of a workflow is known as! capturing lineage or provenance"» Spark s Resilient Distributed Datasets do this for you automatically"
26 Impediments to Collaboration" The diversity of tools and programming/scripting languages makes it hard to share" Finding a script or computed result is! often harder than just writing the! program from scratch!"» Question: How could we fix this?" View that most analysis work is! throw away "
27 Businessperson" Programmer" Enterprise" Web Company" Data Science Roles"
28 Data Sources"» Web pages"» Excel" The Businessperson" ETL"» Copy and paste" Data Warehouse"» Excel" Business Intelligence and Analytics"» Excel functions"» Excel charts"» Visual Basic" Image: "
29 The Programmer" Data Sources"» Web scraping, web services API"» Excel spreadsheet exported as Comma Separated Values"» Database queries" ETL"» wget, curl, Beautiful Soup, lxml" Data Warehouse"» Flat files" Business Intelligence and Analytics"» Numpy, Matplotlib, R, Matlab, Octave" Image: "
30 Data Sources"» Application databases"» Intranet files"» Application server log files" The Enterprise" ETL"» Informatica, IBM DataStage, Ab Initio, Talend" Data Warehouse"» Teradata, Oracle, IBM DB2, Microsoft SQL Server" Business Intelligence and Analytics"» SAP Business Objects, IBM Cognos, Microstrategy, SAS,! SPSS, R" Image: "
31 Data Sources"» Application databases"» Logs from the services tier"» Web crawl data" The Web Company" ETL"» Apache Flume, Apache Sqoop, Apache Pig, Apache Oozie,! Apache Crunch" Data Warehouse"» Apache Hadoop/Apache Hive, Apache Spark/Spark SQL" Business Intelligence and Analytics"» Custom dashboards: Oracle Argus, Razorflow"» R" Image:
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