Are New Modeling Techniques Worth It?
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1 Are New Modeling Techniques Worth It? Tom Zougas PhD PEng, Manager Data Science, TransUnion TORONTO SAS USER GROUP MAY 2, 2018
2 Are New Modeling Techniques Worth It? Presenter Tom Zougas PhD PEng, Manager Data Science, TransUnion As Senior Manager of Data Science at TransUnion Canada, Tom and his team are tasked with delivering advanced analytics projects. He has 20 years of technical consulting experience in data analysis, system design, and software development. Tom has worked with clients in industries as diverse as financial services, insurance, software, utilities, telecom, pharmaceuticals and metals. Prior to joining TransUnion, he was Director of Analytics at Angoss Software, where he managed a team of data scientists, worked as a senior advanced analytics consultant at IBM and at SAS, and managed the advanced analytics team at BlackBerry (RIM). He has also authored and taught courses in data mining. Tom holds a PhD in Engineering from the University of Toronto TransUnion LLC All Rights Reserved 2
3 Agenda Know The Core Applying The Core Models A Sampling of New Model Types Q&A 2018 TransUnion LLC All Rights Reserved 3
4 Know The Core
5 Regression Top 3 Machine Learning Methods Clustering Decision Trees 2018 TransUnion LLC All Rights Reserved 5
6 KDnuggets 2017 Survey Source: TransUnion LLC All Rights Reserved 6
7 What Makes Them the Top 3 Are they state of the art? No Are they leading edge? No Are they exotic? No What are they? Simple Interpretable They Work 2018 TransUnion LLC All Rights Reserved 7
8 Categories of Machine Learning Algorithms Supervised Learning Unsupervised Learning Others Inputs Attributes Variables Inputs Attributes Variables Output Outcome Target ML Algorithm Model ML Algorithm Model 2018 TransUnion LLC All Rights Reserved 8
9 Landscape of Machine Learning Algorithms Support Vector Machines Linear/Logistic Regression Naive Bayes Supervised Learning Linear Discriminant Analysis Decision Trees K Nearest Neighbor Neural Networks Unsupervised Learning Clustering (k-means, hierarchical) Anomaly Detection Neural Networks (autoencoders, SOM) Expectation Maximization Principal Component Analysis Singular Value Decomposition Association Analysis Often times, the baseline is sufficient to satisfy the business objective TransUnion LLC All Rights Reserved 9
10 Applying The Core Models
11 What Analytics Methodology Do You Use CRISP-DM SEMMA KDD Knowledge Discovery in Databases Custom 2018 TransUnion LLC All Rights Reserved 11
12 What Is The Business Problem Do you want to categorize a record or observation? Do you want to predict a numerical quantity? Do you want to rank order your records based on some outcome of interest? Do you want to identify naturally occurring groupings in the data? By defining the business problem: Ensure you are collecting the right data Determine what type of model to apply Know when you are done and can go to the next phase 2018 TransUnion LLC All Rights Reserved 12
13 The Data Science Workflow 2018 TransUnion LLC All Rights Reserved 13
14 Model Selection The modeling step is where you apply one of the relevant model types: If the data contains known outcomes, then you use a supervised learning algorithm: regression or decision tree (or possibly both). If the data does not have known outcomes (or labels), then apply the unsupervised learning algorithm: clustering TransUnion LLC All Rights Reserved 14
15 Assessing Model Performance Interpreting ROC Which is better: Random Model 1 Model 2 Model TransUnion LLC All Rights Reserved 15
16 A Sampling of New Model Types
17 Deep Learning A New Generation of Artificial Neural Networks Source: TransUnion LLC All Rights Reserved 17
18 Deep Learning Use Cases Fraud Detection Automatic speech recognition Image recognition Visual art processing Natural language processing Drug discovery and toxicology Customer relationship management Recommendation systems Bioinformatics Mobile advertising Image restoration 2018 TransUnion LLC All Rights Reserved 18
19 Ensemble If one model is good, many models should be better Source: SAS Enterprise Miner 14.3: Reference Help 2018 TransUnion LLC All Rights Reserved 19
20 Elastic Net High Dimensional Data Correlated Variables Elastic Net Improve Accuracy Improve Interpretability 2018 TransUnion LLC All Rights Reserved 20
21 Automated Machine Learning Source: TransUnion LLC All Rights Reserved 21
22 Where Do We Go From Here Has the business problem been identified? Make sure the focus is on solving the business problem Which modeling approach to use? The core models provide a good starting point and may be sufficient for satisfying the business objective Are there issues with the data? A new model will not fix bad data Is the model usable/deployable? An overly complex model may be difficult to deploy make sure it s worth it 2018 TransUnion LLC All Rights Reserved 22
23 Q&A Tom Zougas PhD PEng
24
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