mhjensen
284 lines
14 KiB
HTML
284 lines
14 KiB
HTML
<!--
|
|
Automatically generated HTML file from DocOnce source
|
|
(https://github.com/hplgit/doconce/)
|
|
-->
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|
<meta name="generator" content="DocOnce: https://github.com/hplgit/doconce/" />
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
|
|
<meta name="description" content="Week 44: From Decision Trees to Bagging methods">
|
|
|
|
<title>Week 44: From Decision Trees to Bagging methods</title>
|
|
|
|
<!-- Bootstrap style: bootstrap -->
|
|
<link href="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
|
|
<!-- not necessary
|
|
<link href="https://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css" rel="stylesheet">
|
|
-->
|
|
|
|
<style type="text/css">
|
|
|
|
/* Add scrollbar to dropdown menus in bootstrap navigation bar */
|
|
.dropdown-menu {
|
|
height: auto;
|
|
max-height: 400px;
|
|
overflow-x: hidden;
|
|
}
|
|
|
|
/* Adds an invisible element before each target to offset for the navigation
|
|
bar */
|
|
.anchor::before {
|
|
content:"";
|
|
display:block;
|
|
height:50px; /* fixed header height for style bootstrap */
|
|
margin:-50px 0 0; /* negative fixed header height */
|
|
}
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<!-- tocinfo
|
|
{'highest level': 2,
|
|
'sections': [('Overview of week 44', 2, None, '___sec0'),
|
|
('Thursday', 2, None, '___sec1'),
|
|
('Decision trees, overarching aims', 2, None, '___sec2'),
|
|
('Basics of a tree', 2, None, '___sec3'),
|
|
('A Sketch of a Tree, Regression problem', 2, None, '___sec4'),
|
|
('A Sketch of a Tree, Classification problem',
|
|
2,
|
|
None,
|
|
'___sec5'),
|
|
('A typical Decision Tree with its pertinent Jargon, '
|
|
'Classification Problem',
|
|
2,
|
|
None,
|
|
'___sec6'),
|
|
('General Features', 2, None, '___sec7'),
|
|
('How do we set it up?', 2, None, '___sec8'),
|
|
('Decision trees and Regression', 2, None, '___sec9'),
|
|
('Building a tree, regression', 2, None, '___sec10'),
|
|
('A top-down approach, recursive binary splitting',
|
|
2,
|
|
None,
|
|
'___sec11'),
|
|
('Making a tree', 2, None, '___sec12'),
|
|
('Pruning the tree', 2, None, '___sec13'),
|
|
('Cost complexity pruning', 2, None, '___sec14'),
|
|
('Schematic Regression Procedure', 2, None, '___sec15'),
|
|
('A Classification Tree', 2, None, '___sec16'),
|
|
('Growing a classification tree', 2, None, '___sec17'),
|
|
('Classification tree, how to split nodes', 2, None, '___sec18'),
|
|
('Visualizing the Tree, Classification', 2, None, '___sec19'),
|
|
('Visualizing the Tree, The Moons', 2, None, '___sec20'),
|
|
('Other ways of visualizing the trees', 2, None, '___sec21'),
|
|
('Printing out as text', 2, None, '___sec22'),
|
|
('Algorithms for Setting up Decision Trees', 2, None, '___sec23'),
|
|
('The CART algorithm for Classification', 2, None, '___sec24'),
|
|
('The CART algorithm for Regression', 2, None, '___sec25'),
|
|
('Computing the Gini index', 2, None, '___sec26'),
|
|
('Simple Python Code to read in Data and perform Classification',
|
|
2,
|
|
None,
|
|
'___sec27'),
|
|
('Computing the Gini Factor', 2, None, '___sec28'),
|
|
('Entropy and the ID3 algorithm', 2, None, '___sec29'),
|
|
('Cancer Data again now with Decision Trees and other Methods',
|
|
2,
|
|
None,
|
|
'___sec30'),
|
|
('Another example, the moons again', 2, None, '___sec31'),
|
|
('Playing around with regions', 2, None, '___sec32'),
|
|
('Regression trees', 2, None, '___sec33'),
|
|
('Final regressor code', 2, None, '___sec34'),
|
|
('Pros and cons of trees, pros', 2, None, '___sec35'),
|
|
('Disadvantages', 2, None, '___sec36'),
|
|
('Ensemble Methods: From a Single Tree to Many Trees and Extreme '
|
|
'Boosting, Meet the Jungle of Methods',
|
|
2,
|
|
None,
|
|
'___sec37'),
|
|
('An Overview of Ensemble Methods', 2, None, '___sec38'),
|
|
('Bagging', 2, None, '___sec39'),
|
|
('More bagging', 2, None, '___sec40'),
|
|
('Simple Voting Example, head or tail', 2, None, '___sec41'),
|
|
('Using the Voting Classifier', 2, None, '___sec42'),
|
|
('Please, not the moons again! Voting and Bagging',
|
|
2,
|
|
None,
|
|
'___sec43'),
|
|
('Bagging Examples', 2, None, '___sec44'),
|
|
('Making your own Bootstrap: Changing the Level of the Decision '
|
|
'Tree',
|
|
2,
|
|
None,
|
|
'___sec45')]}
|
|
end of tocinfo -->
|
|
|
|
<body>
|
|
|
|
|
|
|
|
<script type="text/x-mathjax-config">
|
|
MathJax.Hub.Config({
|
|
TeX: {
|
|
equationNumbers: { autoNumber: "none" },
|
|
extensions: ["AMSmath.js", "AMSsymbols.js", "autobold.js", "color.js"]
|
|
}
|
|
});
|
|
</script>
|
|
<script type="text/javascript" async
|
|
src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
|
|
</script>
|
|
|
|
|
|
|
|
|
|
<!-- Bootstrap navigation bar -->
|
|
<div class="navbar navbar-default navbar-fixed-top">
|
|
<div class="navbar-header">
|
|
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-responsive-collapse">
|
|
<span class="icon-bar"></span>
|
|
<span class="icon-bar"></span>
|
|
<span class="icon-bar"></span>
|
|
</button>
|
|
<a class="navbar-brand" href="week44-bs.html">Week 44: From Decision Trees to Bagging methods</a>
|
|
</div>
|
|
|
|
<div class="navbar-collapse collapse navbar-responsive-collapse">
|
|
<ul class="nav navbar-nav navbar-right">
|
|
<li class="dropdown">
|
|
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Contents <b class="caret"></b></a>
|
|
<ul class="dropdown-menu">
|
|
<!-- navigation toc: --> <li><a href="._week44-bs001.html#___sec0" style="font-size: 80%;">Overview of week 44</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs002.html#___sec1" style="font-size: 80%;">Thursday</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs003.html#___sec2" style="font-size: 80%;">Decision trees, overarching aims</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs004.html#___sec3" style="font-size: 80%;">Basics of a tree</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs005.html#___sec4" style="font-size: 80%;">A Sketch of a Tree, Regression problem</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs006.html#___sec5" style="font-size: 80%;">A Sketch of a Tree, Classification problem</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs007.html#___sec6" style="font-size: 80%;">A typical Decision Tree with its pertinent Jargon, Classification Problem</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs008.html#___sec7" style="font-size: 80%;">General Features</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs009.html#___sec8" style="font-size: 80%;">How do we set it up?</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs010.html#___sec9" style="font-size: 80%;">Decision trees and Regression</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs011.html#___sec10" style="font-size: 80%;">Building a tree, regression</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs012.html#___sec11" style="font-size: 80%;">A top-down approach, recursive binary splitting</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs013.html#___sec12" style="font-size: 80%;">Making a tree</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs014.html#___sec13" style="font-size: 80%;">Pruning the tree</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs015.html#___sec14" style="font-size: 80%;">Cost complexity pruning</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs016.html#___sec15" style="font-size: 80%;">Schematic Regression Procedure</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs017.html#___sec16" style="font-size: 80%;">A Classification Tree</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs018.html#___sec17" style="font-size: 80%;">Growing a classification tree</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs019.html#___sec18" style="font-size: 80%;">Classification tree, how to split nodes</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs020.html#___sec19" style="font-size: 80%;">Visualizing the Tree, Classification</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs021.html#___sec20" style="font-size: 80%;">Visualizing the Tree, The Moons</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs022.html#___sec21" style="font-size: 80%;">Other ways of visualizing the trees</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs023.html#___sec22" style="font-size: 80%;">Printing out as text</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs024.html#___sec23" style="font-size: 80%;">Algorithms for Setting up Decision Trees</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs025.html#___sec24" style="font-size: 80%;">The CART algorithm for Classification</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs026.html#___sec25" style="font-size: 80%;">The CART algorithm for Regression</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs027.html#___sec26" style="font-size: 80%;">Computing the Gini index</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs028.html#___sec27" style="font-size: 80%;">Simple Python Code to read in Data and perform Classification</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs029.html#___sec28" style="font-size: 80%;">Computing the Gini Factor</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs030.html#___sec29" style="font-size: 80%;">Entropy and the ID3 algorithm</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs031.html#___sec30" style="font-size: 80%;">Cancer Data again now with Decision Trees and other Methods</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs032.html#___sec31" style="font-size: 80%;">Another example, the moons again</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs033.html#___sec32" style="font-size: 80%;">Playing around with regions</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs034.html#___sec33" style="font-size: 80%;">Regression trees</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs035.html#___sec34" style="font-size: 80%;">Final regressor code</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs036.html#___sec35" style="font-size: 80%;">Pros and cons of trees, pros</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs037.html#___sec36" style="font-size: 80%;">Disadvantages</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs038.html#___sec37" style="font-size: 80%;">Ensemble Methods: From a Single Tree to Many Trees and Extreme Boosting, Meet the Jungle of Methods</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs039.html#___sec38" style="font-size: 80%;">An Overview of Ensemble Methods</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs040.html#___sec39" style="font-size: 80%;">Bagging</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs041.html#___sec40" style="font-size: 80%;">More bagging</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs042.html#___sec41" style="font-size: 80%;">Simple Voting Example, head or tail</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs043.html#___sec42" style="font-size: 80%;">Using the Voting Classifier</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs044.html#___sec43" style="font-size: 80%;">Please, not the moons again! Voting and Bagging</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs045.html#___sec44" style="font-size: 80%;">Bagging Examples</a></li>
|
|
<!-- navigation toc: --> <li><a href="._week44-bs046.html#___sec45" style="font-size: 80%;">Making your own Bootstrap: Changing the Level of the Decision Tree</a></li>
|
|
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div> <!-- end of navigation bar -->
|
|
|
|
<div class="container">
|
|
|
|
<p> </p><p> </p><p> </p> <!-- add vertical space -->
|
|
|
|
<a name="part0000"></a>
|
|
<!-- ------------------- main content ---------------------- -->
|
|
|
|
|
|
|
|
<div class="jumbotron">
|
|
<center><h1>Week 44: From Decision Trees to Bagging methods</h1></center> <!-- document title -->
|
|
|
|
<p>
|
|
<!-- author(s): Morten Hjorth-Jensen -->
|
|
|
|
<center>
|
|
<b>Morten Hjorth-Jensen</b> [1, 2]
|
|
</center>
|
|
|
|
<p>
|
|
<!-- institution(s) -->
|
|
|
|
<center>[1] <b>Department of Physics, University of Oslo</b></center>
|
|
<center>[2] <b>Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University</b></center>
|
|
<br>
|
|
<p>
|
|
<center><h4>Nov 5, 2020</h4></center> <!-- date -->
|
|
<br>
|
|
<p>
|
|
|
|
|
|
<p><a href="._week44-bs001.html" class="btn btn-primary btn-lg">Read »</a></p>
|
|
|
|
|
|
</div> <!-- end jumbotron -->
|
|
|
|
<p>
|
|
<!-- navigation buttons at the bottom of the page -->
|
|
<ul class="pagination">
|
|
<li class="active"><a href="._week44-bs000.html">1</a></li>
|
|
<li><a href="._week44-bs001.html">2</a></li>
|
|
<li><a href="._week44-bs002.html">3</a></li>
|
|
<li><a href="._week44-bs003.html">4</a></li>
|
|
<li><a href="._week44-bs004.html">5</a></li>
|
|
<li><a href="._week44-bs005.html">6</a></li>
|
|
<li><a href="._week44-bs006.html">7</a></li>
|
|
<li><a href="._week44-bs007.html">8</a></li>
|
|
<li><a href="._week44-bs008.html">9</a></li>
|
|
<li><a href="._week44-bs009.html">10</a></li>
|
|
<li><a href="">...</a></li>
|
|
<li><a href="._week44-bs046.html">47</a></li>
|
|
<li><a href="._week44-bs001.html">»</a></li>
|
|
</ul>
|
|
<!-- ------------------- end of main content --------------- -->
|
|
|
|
</div> <!-- end container -->
|
|
<!-- include javascript, jQuery *first* -->
|
|
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
|
|
<script src="https://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
|
|
|
|
<!-- Bootstrap footer
|
|
<footer>
|
|
<a href="http://..."><img width="250" align=right src="http://..."></a>
|
|
</footer>
|
|
-->
|
|
|
|
|
|
<center style="font-size:80%">
|
|
<!-- copyright --> © 1999-2020, Morten Hjorth-Jensen. Released under CC Attribution-NonCommercial 4.0 license
|
|
</center>
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|
|
|