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Applied Data Analysis and Machine Learning
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About the course
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Textbooks
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Review of Statistics with Resampling Techniques and Linear Algebra
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1. Elements of Probability Theory and Statistical Data Analysis
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2. Linear Algebra, Handling of Arrays and more Python Features
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From Regression to Support Vector Machines
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3. Linear Regression
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4. Ridge and Lasso Regression
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5. Resampling Methods
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6. Logistic Regression
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7. Optimization, the central part of any Machine Learning algortithm
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8. Support Vector Machines, overarching aims
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Decision Trees, Ensemble Methods and Boosting
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9. Decision trees, overarching aims
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10. Ensemble Methods: From a Single Tree to Many Trees and Extreme Boosting, Meet the Jungle of Methods
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Dimensionality Reduction
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11. Basic ideas of the Principal Component Analysis (PCA)
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12. Clustering and Unsupervised Learning
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Deep Learning Methods
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13. Neural networks
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14. Building a Feed Forward Neural Network
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15. Solving Differential Equations with Deep Learning
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16. Convolutional Neural Networks
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17. Recurrent neural networks: Overarching view
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Weekly material, notes and exercises
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Exercises week 34
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Week 34: Introduction to the course, Logistics and Practicalities
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Exercises week 35
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Week 35: From Ordinary Linear Regression to Ridge and Lasso Regression
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Exercises week 36
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Week 36: Statistical interpretation of Linear Regression and Resampling techniques
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Exercises week 37
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Week 37: Statistical interpretations and Resampling Methods
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Exercises week 38
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Week 38: Logistic Regression and Optimization
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Exercises week 39
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Week 39: Optimization and Gradient Methods
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Week 40: Gradient descent methods (continued) and start Neural networks
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Exercises week 41
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Week 41 Neural networks and constructing a neural network code
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Exercises week 42
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Week 42 Constructing a Neural Network code with introduction to Tensor flow
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Exercises weeks 43 and 44
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Week 43: Deep Learning: Constructing a Neural Network code and solving differential equations
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Week 44, Convolutional Neural Networks (CNN)
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Week 45, Recurrent Neural Networks
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Week 46: Decision Trees, Ensemble methods and Random Forests
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Week 47: From Decision Trees to Ensemble Methods, Random Forests and Boosting Methods and Summary of Course
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Project 1 on Machine Learning, deadline October 9 (midnight), 2023
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<h1>Exercises week 42</h1>
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<h1>Exercises week 42<a class="headerlink" href="#exercises-week-42" title="Permalink to this headline"></a></h1>
<p><strong>October 9-13, 2023</strong></p>
<p>Date: <strong>Deadline is Sunday October 22 at midnight</strong></p>
<p>You can hand in the exercises from week 41 and week 42 as one exercise and get a total score of two additional points.</p>
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<div class="tex2jax_ignore mathjax_ignore section" id="overarching-aims-of-the-exercises-this-week">
<h1>Overarching aims of the exercises this week<a class="headerlink" href="#overarching-aims-of-the-exercises-this-week" title="Permalink to this headline"></a></h1>
<p>The aim of the exercises this week is to get started with implementing
gradient methods of relevance for project 2. The exercise this week is a simple
continuation from the previous week with the addition of automatic differentation.
Everything you develop here will be used in project 2.</p>
<p>In order to get started, we will now replace in our standard ordinary
least squares (OLS) and Ridge regression codes (from project 1) the
matrix inversion algorithm with our own gradient descent (GD) and SGD
codes. You can use the Franke function or the terrain data from
project 1. <strong>However, we recommend using a simpler function like</strong>
<span class="math notranslate nohighlight">\(f(x)=a_0+a_1x+a_2x^2\)</span> or higher-order one-dimensional polynomials.
You can obviously test your final codes against for example the Franke
function. Automatic differentiation will be discussed next week.</p>
<p>You should include in your analysis of the GD and SGD codes the following elements</p>
<ol class="simple">
<li><p>A plain gradient descent with a fixed learning rate (you will need to tune it) using automatic differentiation. Compare this with the analytical expression of the gradients you obtained last week. Feel free to use <strong>Autograd</strong> as Python package or <strong>JAX</strong>. You can use the examples form last week.</p></li>
<li><p>Add momentum to the plain GD code and compare convergence with a fixed learning rate (you may need to tune the learning rate). Compare this with the analytical expression of the gradients you obtained last week.</p></li>
<li><p>Repeat these steps for stochastic gradient descent with mini batches and a given number of epochs. Use a tunable learning rate as discussed in the lectures from week 39. Discuss the results as functions of the various parameters (size of batches, number of epochs etc)</p></li>
<li><p>Implement the Adagrad method in order to tune the learning rate. Do this with and without momentum for plain gradient descent and SGD using automatic differentiation..</p></li>
<li><p>Add RMSprop and Adam to your library of methods for tuning the learning rate. Again using automatic differentiation.</p></li>
</ol>
<p>The lecture notes from weeks 39 and 40 contain more information and code examples. Feel free to use these examples.</p>
<p>We recommend reading chapter 8 on optimization from the textbook of <a class="reference external" href="https://www.deeplearningbook.org/">Goodfellow, Bengio and Courville</a>. This chapter contains many useful insights and discussions on the optimization part of machine learning.</p>
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