CRISP-DM - Agile Approach To Data Mining Projects
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This document summarizes Michał Łopuszyński's presentation on using an agile approach based on the CRISP-DM methodology for data mining projects. It discusses the key phases of CRISP-DM including business understanding, data understanding, data preparation, modelling, evaluation, and deployment. For each phase, it provides examples of best practices and challenges, with an emphasis on spending sufficient time on data understanding and preparation, developing models with the deployment context in mind, and carefully evaluating results against business objectives.
CRISP-DM - Agile Approach To Data Mining Projects
- 1. CRISP-DM Agile Approach to Data Mining Projects Michał Łopuszyński Warsaw Data Science Meetup, 2016.06.07
- 2. About me I work at ICM UW• Our group = Applied Data Analysis Lab• Supercomputing centre, weather forecast , virtual library, open science platform, visualization solutions, ... • Involved in modelling and data analysis projects from cosmology, medicine, bioinformatics, quantum chemistry, biophysics, fluid dynamics, materials science, social network analysis ... • Automatic information extraction from PDFs• Text-mining in scientific literature• Variety of application projects (analysis of court judgments, aviation, deploying solutions on the big data stack Spark/Hadoop, trainings) • About me adalab.icm.edu.pl
- 3. What is CRISP-DM? Cross Industry Standard Process for Data Mining • SPSS, Teradata, Daimler, OCHRA, NCR Developed in 1996 by big players in data analysis • • I follow "CRISP-DM 1.0 Step-by-step data mining guide"• 01001110010101 011100100111000110 100101110101 100010011101001 10000000111000001 10000110110110 110000110010010001 DATA Business Understanding Data Understanding Data Preparation Modelling Evaluation Deployment Most popular methodology for data-centric projects See KDNuggets Polls• Runner-up SEMMA• I find it agile• Introduces almost no overhead• Emphasizes adaptive transitions between project phases • 2007, 2014
- 4. Business Understanding Determine business objectives• Resources (data!), risks, costs & benefits Assess situation• Ideally with quantitative success criteria Determine data mining goals• Estimate time line, budget, but also tools and techniques Develop project plan• 01001110010101 011100100111000110 100101110101 100010011101001 10000000111000001 10000110110110 110000110010010001 DATA Business Understanding Data Understanding Data Preparation Modelling Evaluation Deployment
- 5. Business Understanding Difficult!• Often, you have to enter a new field• You have to explain data science limitations to non-experts • Source: http://xkcd.com/1425 No, performance will not be 100%• We need much more data to train an accurate model • For tomorrow, it is impossible•
- 6. Business Understanding – my DOs and DON'Ts Have a lot of patience for vaguely defined problems• Do not waste your time on ill-defined, unrealistic projects• Learn to concretize or even reduce the scope of the initial idea• Data sample• Real-life use cases• Quantitative success metrics•
- 7. Data Understanding Collect initial data• Persist results Describe data• Persist results Explore data• Carefully document problems and issues found! Verify data quality• 01001110010101 011100100111000110 100101110101 100010011101001 10000000111000001 10000110110110 110000110010010001 DATA Business Understanding Data Understanding Data Preparation Modelling Evaluation Deployment
- 8. Data Understanding – Validate Everything <judgement id="..."> <date>3013-12-04 00:00:00.0 CET</date> <publicationDate>2014-07-23 02:52:17.0 CEST</publicationDate> <courtId>15250000</courtId> <departmentId>503</departmentId> <chairman>Małgorzata ...</chairman> <judges> <judge>Małgorzata ...</judge> </judges> ... </judgement> <judgement id="..."> <date>2012-10-01 00:00:00.0 CEST</date> <publicationDate>2014-12-31 18:15:05.0 CET</publicationDate> <courtId>15450500</courtId> <departmentId>6027</departmentId> <judges> <judge>Piotr ...</judge> <judge>wskazał</judge> <judge>czego wymaga art. 17a ust. 2 ustawy</judge> ... </judges> </judgement>
- 9. Data Understanding – Spot Anomalies Histogram of certain smooth quantity measured using "precise equipment" Explanation – effect of human interface between precise equipment & db
- 10. Data Understanding – Spot Anomalies Secondary school examination (Matura) score distribution from Polish Exploratory data analysis can reveal imperfections of conducted experiment Source: CKE Materials, Matura 2012
- 11. Data Understanding – my DOs and DON'Ts Do not trust data quality estimates provided by your customer• Verify as far as you can, if your data is correct, complete, coherent, deduplicated, representative, independent, up-to-date, stationary • Understand anomalies and outliers• Do not economize on this phase• The earlier you discover issues with your data the better (yes, your data will have issues!) • Data understanding leads to domain understanding, it will pay off in the modelling phase • Investigate what sort of processing was applied to the raw data•
- 12. Data Preparation Select data• Clean data• Generate derived attributes Construct data• Merge information from different sources Integrate data• Convert to format convenient for modelling Format data• 01001110010101 011100100111000110 100101110101 100010011101001 10000000111000001 10000110110110 110000110010010001 DATA Business Understanding Data Understanding Data Preparation Modelling Evaluation Deployment
- 13. Data Preparation Tedious!• Make, Drake Use workflow tools to document, automate & parallelize data prep.• classification-jsonl data-aux/class-riffle data-clean/joind-jsonl data-aux/metad-riffle data-aux/priis-json data-aux/prinf-json stat/basic stat/basic-fp7 stat/collab metadata-jsonl projects-from-iis-jsonl projects-from-infspace-jsonlmetadata-extracted-jsonl Oozie, Azkaban, Luigi, Airflow, ...
- 14. Data Preparation Data understanding and preparation will usually consume half or more of your project time! • 20% 20% 14% 10% 10%10% What % of time in your data mining project(s) is spent on data cleaning and preparation? 8% 4% 25% 25% 39% Percentage of responses Percentageoftime Source: M.A.Munson, A Study on the Importance of and Time Spent Different Modeling Steps, ACM SIGKDD Explorations Newsletter 13, 65-71 (2011) Source: KDNuggets Poll 2003
- 15. Data Preparation – my DOs and DON'Ts Use workflow tools to help you with the above• Prepare your customer that data understanding and preparation take considerable amount of time • Automate this phase as far as possible• When merging multiple sources, track provenance of your data•
- 16. Modelling Generate test design• Feature eng., optimize model parameters Build model• Iterate the above Assess model• Assumptions, measure of accuracy Select modelling technique• 01001110010101 011100100111000110 100101110101 100010011101001 10000000111000001 10000110110110 110000110010010001 DATA Business Understanding Data Understanding Data Preparation Modelling Evaluation Deployment
- 17. Modelling – Tooling Selection Where your model will be deployed?• Do you need to distribute your computations? (avoid!) • Breadth = performance, lots of general purpose libraries and tooling, easy creation of web services Should I use general purpose language?• C++ Java C# R Matlab Mathematica Python Scala ClojureF# BreadthDepth (quality of general purpose tooling) (qualityofdataanalysistooling) Depth = easy data manipulation, latest models and statistical techniques available Should I use data analysis language?• Can I afford a prototype?•
- 18. Modelling – my DOs and DON'Ts Develop your model with deployment conditions in mind• Allocate time for hyperparameter optimization• • Whenever possible, peek inside your model and consult it with domain expert Assess feature importance• Run your model on simulated data• Be creative with your features (feature engineering)• Esp. from textual data or time-series you can generate a lot of std. features• Make conscious decision about missing data (NAs) and outliers (regression!)•
- 19. Evaluation Review process• To deploy or not to deploy? Determine next steps• Determine next steps Business success criteria fulfilled? Evaluate results• 01001110010101 011100100111000110 100101110101 100010011101001 10000000111000001 10000110110110 110000110010010001 DATA Business Understanding Data Understanding Data Preparation Modelling Evaluation Deployment
- 20. Evaluation – my DOs and DON'Ts Work with the performance criteria dictated by your customer's business model • Assess not only performance, but also practical aspects, related to deployment, for example: • Training and prediction speed• Robustness and maintainability (tooling, dependence on other subsystems, library vs. homegrown code) • Watch out for data leakage, for example:• Time series – mixing past and future• Meaningful identifiers• Other nasty ways of artificially introducing extra information, not available in production •
- 21. Deployment Plan monitoring and maintenance• Produce final report• Plan deployment• Collect lessons learned! Review project• 01001110010101 011100100111000110 100101110101 100010011101001 10000000111000001 10000110110110 110000110010010001 DATA Business Understanding Data Understanding Data Preparation Modelling Evaluation Deployment
- 22. Deployment – my DOs and DON'Ts Read this paper, for excellent insights!