Practical Machine Learning with R - Matthewrenze · Insurance Policy Risk Data Set Insurance Policy...
Transcript of Practical Machine Learning with R - Matthewrenze · Insurance Policy Risk Data Set Insurance Policy...
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Practical Machine Learning with R
@MatthewRenze#Microsoft
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Human
Cat
Dog
Car
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Job Postings for Machine Learning
Source: Indeed.com
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Source: Stack Overflow 2017
Average Salary by Job Type (USA)
$108,000
$101,000
$100,000
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70%
60%
40%
30%
20%
10%
0%
50%
SQ
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Exc
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Pyth
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MySQ
LR
Pyth
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Java
Scr
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Matp
lotl
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Java
Po
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D3
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Hiv
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Sp
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Clo
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(EM
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Perl
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data
Tool: language, platform, analytics
Sh
are
of
Resp
on
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ts
Source: O’Reilly 2015 Data Science Salary Survey
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Overview
1. Intro to ML and R
2. Classification
3. Regression
4. Clustering
5. ML in Practice
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How Does This Apply to Me?
Make decisions using data
Make predictions using data
Make recommendations using data
Automate these with code
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Conceptual Model
Data PredictionMachine
Learning
𝑓 𝑥
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About Me
Data Science Consultant
EducationB.S. in Computer Science
B.A. in Philosophy
Data Science specializations
CommunityPublic speaker
Pluralsight author
Microsoft MVP
Open source
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Schedule
Lectures (10 min)
Demos (10 min)
Labs (20 min)
Breaks (5 min)
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Logistics
Pairing for labs is optional
Ask questions if needed
Come and go as needed
Feedback at the end
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Labs
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Labs
A(Easy)
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Labs
A(Easy)
B(Hard)
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Labs
A(Easy)
B(Hard)
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Workshop URL
http://www.matthewrenze.com/workshops/practical-machine-learning-with-r/
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Introduction to Machine Learning
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What is machine learning?
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ArtificialIntelligence
StatisticsMachineLearning
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𝑓 𝑥
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𝑓 𝑥
Data Function Prediction
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DataPredictionFunction
𝑓 𝑥
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DataPredictionFunction
𝑓 𝑥
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DataPredictionFunction
Cat Not cat
𝑓 𝑥
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DataPredictionFunction
Cat
𝑓 𝑥
Not cat
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DataPredictionFunction
Cat Is cat?
𝑓 𝑥
Not cat
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DataPredictionFunction
Cat Is cat?
𝑓 𝑥
Not cat
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DataPredictionFunction
Cat Is cat? Yes
𝑓 𝑥
Not cat
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What types of machine learning exist?
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Types of Machine Learning
Supervised Learning Unsupervised Learning
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Types of Machine Learning
Supervised Learning
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Types of Machine Learning
Unsupervised Learning
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How does machine learning work?
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Data
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Data
Training
Test
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Training
Algorithm
Data
Training
Test
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Training
AlgorithmModel
Data
Training
Test
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Training
AlgorithmModel
Data
Training
Test
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Training
AlgorithmModel
Data
Training
Test
New Data
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Training
AlgorithmModel
Data
Training
Test
New Data
Prediction
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Super simplified version of machine learning!
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What can machine learning do?
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𝑓 𝑥
1.23
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𝑓 𝑥
1.23
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𝑓 𝑥
1.23
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Source: YOLO: Real-Time Object Detection
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Source: http://grail.cs.washington.edu/projects/AudioToObama/ Source: Nvidia
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Source: http://grail.cs.washington.edu/projects/AudioToObama/
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Source: Pouff - Grocery TripSource: Google Deep Mind
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Source: Boston Dynamics
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Source: Boston Dynamics
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𝑓 𝑥 1.23
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Disclaimer
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Introduction to R
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What is R?
Open source
Language and environment
Numerical and graphical
Cross platform
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What is R?
Active development
Large user community
Modular and extensible
10,000+ extensions
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FREE
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FREE
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Source: http://redmonk.com/sogrady/2016/07/20/language-rankings-6-16/
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70%
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Vis
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Tera
data
Tool: language, platform, analytics
Sh
are
of
Resp
on
den
ts
Source: O’Reilly 2015 Data Science Salary Survey
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Demo 1 R Language Basics
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Lab 1 R Language Basics
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Classification
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Count of Spam Words
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Count of Spam Words
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𝑓 𝑥
Data Function Category
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Classification Algorithms
k-Nearest Neighbors
Decision Tree Classifier
Naïve Bayes Classifier
Support Vector Machine
Neural Network Classifier
x1
x2
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Classification Algorithms
?
is sex male?
is age > 9.5?
is family > 2.5?
SurvivedDied
Died
Survived
k-Nearest Neighbors Decision Tree Neural Network
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k-Nearest Neighbors Classifier
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Count of Spam Words
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?
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?
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?
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?
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K-Nearest Neighbors Classifier
Supervised learning
?
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K-Nearest Neighbors Classifier
Supervised learning
Uses class of neighbors ?
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K-Nearest Neighbors Classifier
Supervised learning
Uses class of neighbors
k specifies how many?
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K-Nearest Neighbors Classifier
Supervised learning
Uses class of neighbors
k specifies how many
Simple and easy
?
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Decision Tree Classifier
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Is count of spam words > 5?
Not Spam?
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Is count of spam words > 5?
Is correct-spelling ratio > 50%?
Not Spam
Not Spam
?
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Is count of spam words > 5?
Is correct-spelling ratio > 50%?
Is known contact?
SpamNot spam
Not Spam
Not Spam
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Count of Spam Words
Co
rrect
Sp
ellin
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o
Has count of spam words > 5?
Has
corr
ect
-sp
ellin
g r
ati
o >
50%
?
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Decision Tree Classifier
Supervised learning
is sex male?
is age > 9.5?
is family > 2.5?
SurvivedDied
Died
Survived
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Decision Tree Classifier
Supervised learning
Tree of decisions
is sex male?
is age > 9.5?
is family > 2.5?
SurvivedDied
Died
Survived
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Decision Tree Classifier
Supervised learning
Tree of decisions
Information gain
is sex male?
is age > 9.5?
is family > 2.5?
SurvivedDied
Died
Survived
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Decision Tree Classifier
Supervised learning
Tree of decisions
Information gain
Simple and easy
is sex male?
is age > 9.5?
is family > 2.5?
SurvivedDied
Died
Survived
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Neural Network Classifier
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inputs neuron outputs
Artificial Neuron𝑥1
𝑥2
𝑥3
𝑦
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Artificial Neuron
Σ
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Artificial Neuron
Σ
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Artificial Neuron
𝜔1
𝜔2
𝜔3
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Artificial Neuron𝜔0
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Artificial Neuron
𝜔1𝜔2
𝜔3
𝜔0
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Artificial Neuron𝑥1
𝑥2
𝑥3
𝑦
𝜔0
𝜔1
𝜔2
𝜔3
𝜑
𝑦𝑘 = 𝜑
𝑗=0
𝑚
𝑤𝑘𝑗𝑥𝑗
Σ
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Artificial Neural Network
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Artificial Neural Network
input outputhidden
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Artificial Neural Network
Forward propagation
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Artificial Neural Network
Backward propagation
Forward propagation
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Artificial Neural Network
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Neural Network Classifier
Supervised learning
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Neural Network Classifier
Supervised learning
Neurons in a brain
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Neural Network Classifier
Supervised learning
Neurons in a brain
Weighted connections
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Neural Network Classifier
Supervised learning
Neurons in a brain
Weighted connections
Complex
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Real-World Examples
Should we approve this loan?
Will this customer buy from us?
Should we replace this part?
Does this person have cancer?
x1
x2
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Iris Data Set
Iris Setosa Iris Versicolor Iris Virginica
Photos by Radomił Binek, Danielle Langlois, and Frank Mayfield
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Fisher’s Iris Data
Species Petal Length Petal Width Sepal Length Sepal Width
setosa 1.1 0.1 4.3 3
setosa 1.4 0.2 4.4 2.9
setosa 1.3 0.2 4.4 3
setosa 1.3 0.2 4.4 3.2
setosa 1.3 0.3 4.5 2.3
… … … …
Iris Data Set
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Goal: Predict species based on
petal and sepal measurements
Demo 2 - Classification
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Insurance Policy Risk Data Set
Insurance Policy Risk
Gender State State Rate Height Weight BMI Age Risk
Male MA 0.01 184 67.8 20.0 77 High
Male VA 0.14 163 89.4 33.6 82 High
Female NY 0.09 170 81.2 28.1 31 Low
Male TN 0.12 175 99.7 32.6 39 Low
Female FL 0.11 184 72.1 21.3 68 High
… … … … … … …
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Insurance Policy Rates Data Set
Insurance Policy Rates
Gender State State Rate Height Weight BMI Age Rate
Male MA 0.01 184 67.8 20.0 77 0.33
Male VA 0.14 163 89.4 33.6 82 0.87
Female NY 0.09 170 81.2 28.1 31 0.01
Male TN 0.12 175 99.7 32.6 39 0.02
Female FL 0.11 184 72.1 21.3 68 0.15
… … … … … … …
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Lab 2A – Classification (Easy)
Goal: Predict species based on
petal and sepal measurements
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Lab 2B – Classification (Hard)
Goal: Predict the risk of
an insurance policy
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Regression
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Area
Sale
Pri
ce
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Area
Sale
Pri
ce
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Sale
Pri
ce
Area
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Sale
Pri
ce
Area
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Area
Sale
Pri
ce
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𝑓 𝑥 1.23
Data Function Number
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Regression Algorithms
Linear Regression
Polynomial Regression
Lasso Regression
ElasticNet Regression
Neural Network Regression
x1
x2
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Regression Algorithms
Simple Linear Multiple Linear Neural Network
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Simple Linear Regression
Relationship
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Simple Linear Regression
Relationship
Linear model
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Simple Linear Regression
Relationship
Linear model
y = m · x + b
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Simple Linear Regression
Relationship
Linear model
y = m · x + b
Parameters estimated
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Multiple Linear Regression
Similar to SLR
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Multiple Linear Regression
Similar to SLR
Multiple variables
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Multiple Linear Regression
Similar to SLR
Multiple variables
Multiple slopes
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Multiple Linear Regression
Similar to SLR
Multiple variables
Multiple slopes
Categorical variables
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Neural Network Regression
Similar to NN classifier
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Neural Network Regression
Similar to NN classifier
Numeric output
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Real-World Examples
How much profit will we make?
What will the price be tomorrow?
How many units will they buy?
How long until this part fails?
x1
x2
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Demo 3 - Regression
Goal: Predict petal width
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Lab 3A – Regression (Easy)
Goal: Predict petal width
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Lab 3B – Regression (Hard)
Goal: Predict mortality rate
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Clustering
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Ag
e
Income
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??
??
Ag
e
Income
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??
??
???
?A
ge
Income
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??
??
???
?A
ge
Income
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Income
Ag
e
22
22
111
11
2
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𝑓 𝑥
Data Function Group
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Clustering Algorithms
K-means
Hierarchical clustering
Expectation maximization
x1
x2
??
??
???
?
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k-Means Clustering
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Income
Ag
e
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Income
Ag
e
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Income
Ag
e
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k-Means Clustering
Unsupervised learning
Source: Wikipedia
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k-Means Clustering
Unsupervised learning
Specify k (# of clusters)
Source: Wikipedia
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k-Means Clustering
Unsupervised learning
Specify k (# of clusters)
Algorithm finds centers
Source: Wikipedia
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k-Means Clustering
Unsupervised learning
Specify k (# of clusters)
Algorithm finds centers
Random restarts
Source: Wikipedia
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Hierarchical Clustering
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a b c d e f
bc de
def
bcdef
abcdef
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a b c d e f
bc de
def
bcdef
abcdef
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a b c d e f
bc de
def
bcdef
abcdef
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a b c d e f
bc de
def
bcdef
abcdef
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a b c d e f
bc de
def
bcdef
abcdef
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a b c d e f
bc de
def
bcdef
abcdef
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a b c d e f
bc de
def
bcdef
abcdef
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Hierarchical Clustering
Unsupervised learning
a b c d e f
bc de
def
bcdef
abcdef
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Hierarchical Clustering
Unsupervised learning
Tree of connectedness
a b c d e f
bc de
def
bcdef
abcdef
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Hierarchical Clustering
Unsupervised learning
Tree of connectedness
Cuts create clusters
a b c d e f
bc de
def
bcdef
abcdef
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Real-world Examples
What are our market segments?
How to group our documents?
Which products to recommend?
x1
x2
??
??
???
?
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Demo 4 - Clustering
Goal: Group flowers by similarity
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Lab 4A – Clustering (Easy)
Goal: Group flowers by similarity
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Lab 4B – Clustering (Hard)
Goal: Group insurance policies
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Ensemble Learning
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Wisdom of the Crowds
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𝑓2 𝑥
𝑓1 𝑥
𝑓3 𝑥
Ensemble Learning
∑
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Types of Ensembles
Same Type of Model Different Types of Models
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Ensemble Creation Techniques
Bagging
Boosting
Stacking
𝑓2 𝑥𝑓1 𝑥 𝑓3 𝑥
∑
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Ensemble Aggregation Techniques
Averaging
Majority Vote
Weighted Average
Weighted Majority Vote 𝑓2 𝑥𝑓1 𝑥 𝑓3 𝑥
∑
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Random Forest Classifier
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Random Forest Classifier
Multiple trees
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Random Forest Classifier
Multiple trees
Created by bagging
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Random Forest Classifier
Multiple trees
Created by bagging
Majority vote
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Random Forest Classifier
Multiple trees
Created by bagging
Majority vote
More robust
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Why Use Ensemble Learning?
Pros
More accurate
More robust
More stable
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Why Use Ensemble Learning?
Pros
More accurate
More robust
More stable
Cons
More complex
More CPU time
More art than science
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Ensemble Learning Demo
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Rock
Mine
Time
Am
plitu
de
Am
plitu
de
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Sonar
V1 V2 V3 … V58 V59 V60 Class
0.02 0.03 0.04 … 0.00 0.01 0.00 rock
0.04 0.05 0.08 … 0.00 0.01 0.00 mine
0.02 0.05 0.10 … 0.01 0.01 0.01 rock
0.01 0.01 0.06 … 0.00 0.00 0.01 rock
0.07 0.06 0.04 … 0.00 0.01 0.01 mine
0.02 0.04 0.02 … 0.00 0.01 0.00 rock
… … … … … … … …
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Demo 5 – ML in Practice
Goal: Predict rock or mine
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Lab 5A – ML in Practice (Easy)
Goal: Predict rock or mine
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Lab 5B – ML in Practice (Hard)
Goal: Predict risk class
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Deep Learning
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𝑓2 𝑥𝑓1 𝑥 𝑓3 𝑥
Deep Learning
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input outputhidden 2
Deep Neural Network
hidden 1 hidden 3
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input outputhidden 2
Deep Neural Network
hidden 1 hidden 3
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input outputhidden 2
Deep Neural Network
hidden 1 hidden 3
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input outputhidden 2
Deep Neural Network
hidden 1 hidden 3
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input outputhidden 2
Deep Neural Network
hidden 1 hidden 3
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input outputhidden 2
Deep Neural Network
hidden 1 hidden 3
John
Jane
Miko
Lee
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input outputhidden 2
Deep Neural Network
hidden 1 hidden 3
Abstractness
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Deep Learning Techniques
Fully connected (DNN)
Convolutional (CNN)
Recurrent (RNN)
Generative Adversarial (GAN)
Deep Q Learning (DQN)
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Deep Neural Network
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Deep Neural Network
Neural network
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Deep Neural Network
Neural network
Multiple hidden layers
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Deep Neural Network
Neural network
Multiple hidden layers
Non-linear activation
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Deep Neural Network
Neural network
Multiple hidden layers
Non-linear activation
Fully connected
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Convolutional Neural Networks (CNN)
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Convolutional Neural Network (CNN)
Sparse
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Convolutional Neural Network (CNN)
Sparse
Convolutions
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Convolutional Neural Network (CNN)
Sparse
Convolutions
Filters
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Convolutional Neural Network (CNN)
Sparse
Convolutions
Filters
Pooling
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𝑓 𝑥
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𝑓 𝑥
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Why Use Deep Learning?
Pros
More powerful
More accurate
Data synthesis
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Why Use Deep Learning?
Pros
More powerful
More accurate
Data synthesis
Cons
More complex
More training
Less transparent
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Deep Learning Demo
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5 10 15 20 25
51
01
52
02
5
1:28
1:2
8
28 x 28
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MNIST
Label Pixel 0 Pixel 1 Pixel 2 … Pixel 781 Pixel 782 Pixel 783
3 0 0 0 … 0 0 0
5 0 0 0 … 0 0 0
0 0 0 0 … 0 0 0
4 0 0 0 … 0 0 0
1 0 0 0 … 0 0 0
9 0 0 0 … 0 0 0
… … … … … … … …
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128 x
1
ReLU
64 x
1
10 x
1
ReLU
Soft
max
3
28 x 28
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Convolution 1
5x5 stride
20 filters tanh
500 x
1
10 x
1
tanh
Soft
max
3
Pool 1
2x2
max
Convolution 2
5x5 stride
50 filters tanh Pool
2x2
max
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Demo 6 – Deep Learning
Goal: Predict handwritten digits
with a deep neural network
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Lab 6A – Deep Learning (Easy)
Goal: Predict handwritten digits
with a deep neural network
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Lab 6B – ML in Practice (Hard)
Goal: Predict handwritten digits
with CNN (LeNet)
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Lab 6B – ML in Practice (Hard)
Goal: Predict handwritten digits
with CNN (LeNet)
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Lab 6B – ML in Practice (Hard)
Goal: Predict handwritten digits
with CNN (LeNet)
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Reinforcement Learning
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NOTE: Add video of RL playing video game
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Reinforcement Learning
𝑓 𝑥 ActionState
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Reinforcement Learning
EnvironmentAgent
state
action
reward
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Reinforcement Learning
WorldCar
position
drive
destination
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Reinforcement Learning
Action replay
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Reinforcement Learning
Action replay
Optimal policy
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Reinforcement Learning
Action replay
Optimal policy
Discounted reward
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Reinforcement Learning
Action replay
Optimal policy
Discounted reward
Markov decision process
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Reinforcement Learning Demo
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Grid World
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States
s1
s2 s3
s4
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s1
s2 s3
s4
Actions
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-1
-1 -1
+10
Rewards
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s1
s2 s3
s4
Optimal Policy
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s1
s2 s3
s4
Recap
States: s1, s2, s3, s4
Actions: up, down, left, right
Rewards: s1, s3, s3 = -1;
s4 = 10
Policy: s1 = down
s2 = right
s3 = up
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Tic-Tac-Toe
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ML in Practice
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What is the machine learning process?
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Find a question
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Find a question
Prepare the data
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Find a question
Prepare the data
Train the model
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Find a question
Prepare the data
Train the model
Evaluate the
model
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Find a question
Prepare the data
Train the model
Evaluate the
model
Deploy the
model
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Find a question
Prepare the data
Train the model
Evaluate the
model
Deploy the
model
Monitor the
model
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Find a
question
Prepare
the data
Train the
model
Evaluate
the
model
Deploy
the
model
Monitor
the
model
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Creating accurate and robust models is not easy
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Goodness of Fit
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Underfit
Goodness of Fit
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Underfit Overfit
Goodness of Fit
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Underfit Good fit Overfit
Goodness of Fit
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Curse of Dimensionality
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Curse of Dimensionality
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Curse of Dimensionality
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Curse of Dimensionality
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Movie Break
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Demo 8 – ML in Practice
Goal: Predict survivors
of the Titanic
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Lab 8A – ML in Practice (Easy)
Goal: Predict survivors
of the Titanic
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Lab 8B – ML in Practice (Hard)
Goal: Predict risk in practice
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ML in Production
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How to Deploy to Production
Deploy to web app (Shiny)
Deploy to cloud (Azure ML)
Deploy to server (ML Server)
Deploy to any app (ONNX)
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Conclusion
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This is just the tip of the iceberg!This is just the tip of the iceberg!
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Ensemble Learning
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Deep Learning
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EnvironmentAgent
state
action
reward
Reinforcement Learning
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Where do we go from here?
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Where to Go Next
Data Camp: https://www.datacamp.com
Pluralsight: https://www.pluralsight.com
Coursera: https://www.coursera.org
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www.pluralsight.com/authors/matthew-renze
Pluralsight Courses
Data Science with R
Data Science: The Big Picture
Deep Learning: The Big Picture
Exploratory Data Analysis with R
Data Visualization with R (3-part)
https://www.pluralsight.com/authors/matthew-renze
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www.matthewrenze.com
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Feedback
Very important to me!
What did you like?
What could I improve?
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Conclusion
1. Intro to ML and R
2. Classification
3. Regression
4. Clustering
5. ML in Practice
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Are you prepared?
Is your organization?
Is our world prepared?
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Contact Info
Matthew Renze
Data Science Consultant
Renze Consulting
Twitter: @matthewrenze
Email: [email protected]
Website: www.matthewrenze.com
Thank You! : )