Ignacio Ruiz, Mariano Zeron

Machine Learning for Risk Calculations (eBook, PDF)

A Practitioner's View

• Format: PDF

Produktbeschreibung

State-of-the-art algorithmic deep learning and tensoring techniques for financial institutions The computational demand of risk calculations in financial institutions has ballooned and shows no sign of stopping. It is no longer viable to simply add more computing power to deal with this increased demand. The solution? Algorithmic solutions based on deep learning and Chebyshev tensors represent a practical way to reduce costs while simultaneously increasing risk calculation capabilities. Machine Learning for Risk Calculations: A Practitioner's View provides an in-depth review of a number of algorithmic solutions and demonstrates how they can be used to overcome the massive computational burden of risk calculations in financial institutions. This book will get you started by reviewing fundamental techniques, including deep learning and Chebyshev tensors. You'll then discover algorithmic tools that, in combination with the fundamentals, deliver actual solutions to the real problems financial institutions encounter on a regular basis. Numerical tests and examples demonstrate how these solutions can be applied to practical problems, including XVA and Counterparty Credit Risk, IMM capital, PFE, VaR, FRTB, Dynamic Initial Margin, pricing function calibration, volatility surface parametrisation, portfolio optimisation and others. Finally, you'll uncover the benefits these techniques provide, the practicalities of implementing them, and the software which can be used. * Review the fundamentals of deep learning and Chebyshev tensors * Discover pioneering algorithmic techniques that can create new opportunities in complex risk calculation * Learn how to apply the solutions to a wide range of real-life risk calculations. * Download sample code used in the book, so you can follow along and experiment with your own calculations * Realize improved risk management whilst overcoming the burden of limited computational power Quants, IT professionals, and financial risk managers will benefit from this practitioner-oriented approach to state-of-the-art risk calculation.

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Produktdetails

• Verlag: John Wiley & Sons
• Seitenzahl: 464
• Erscheinungstermin: 20. Dezember 2021
• Englisch
• ISBN-13: 9781119791393
• Artikelnr.: 63362589

Autorenporträt

IGNACIO RUIZ, PhD, is the head of Counterparty Credit Risk Measurement and Analytics at Scotiabank. Prior to that he has been head quant for Counterparty Credit Risk Exposure Analytics at Credit Suisse, head of Equity Risk Analytics at BNP Paribas and he founded MoCaX Intelligence, from where he offered his services as an independent consultant. He holds a PhD in Physics from the University of Cambridge. MARIANO ZERON, PhD, is Head of Research and Development at MoCaX Intelligence. Prior to that he was a quant researcher at Areski Capital. He has extensive experience with Chebyshev Tensors and Deep Neural Nets applied to risk calculations. He holds a PhD in Mathematics from the University of Cambridge.

Inhaltsangabe

Acknowledgements xvii

Foreword xxi

Motivation and aim of this book xxiii

Part One Fundamental Approximation Methods

Chapter 1 Machine Learning 3

1.1 Introduction to Machine Learning 3

1.1.1 A brief history of Machine Learning Methods 4

1.1.2 Main sub-categories in Machine Learning 5

1.1.3 Applications of interest 7

1.2 The Linear Model 7

1.2.1 General concepts 8

1.2.2 The standard linear model 12

1.3 Training and predicting 15

1.3.1 The frequentist approach 18

1.3.2 The Bayesian approach 21

1.3.3 Testing--in search of consistent accurate predictions 25

1.3.4 Underfitting and overfitting 25

1.3.5 K-fold cross-validation 27

1.4 Model complexity 28

1.4.1 Regularisation 29

1.4.2 Cross-validation for regularisation 31

1.4.3 Hyper-parameter optimisation 33

Chapter 2 Deep Neural Nets 39

2.1 A brief history of Deep Neural Nets 39

2.2 The basic Deep Neural Net model 41

2.2.1 Single neuron 41

2.2.2 Artificial Neural Net 43

2.2.3 Deep Neural Net 46

2.3 Universal Approximation Theorems 48

2.4 Training of Deep Neural Nets 49

2.4.1 Backpropagation 50

2.4.2 Backpropagation example 51

2.4.3 Optimisation of cost function 55

2.4.4 Stochastic gradient descent 57

2.4.5 Extensions of stochastic gradient descent 58

2.5 More sophisticated DNNs 59

2.5.1 Convolution Neural Nets 59

2.5.2 Other famous architectures 63

2.6 Summary of chapter 64

Chapter 3 Chebyshev Tensors 65

3.1 Approximating functions with polynomials 65

3.2 Chebyshev Series 66

3.2.1 Lipschitz continuity and Chebyshev projections 67

3.2.2 Smooth functions and Chebyshev projections 70

3.2.3 Analytic functions and Chebyshev projections 70

3.3 Chebyshev Tensors and interpolants 72

3.3.1 Tensors and polynomial interpolants 72

3.3.2 Misconception over polynomial interpolation 73

3.3.3 Chebyshev points 74

3.3.4 Chebyshev interpolants 76

3.3.5 Aliasing phenomenon 77

3.3.6 Convergence rates of Chebyshev interpolants 77

3.3.7 High-dimensional Chebyshev interpolants 79

3.4 Ex ante error estimation 82

3.5 What makes Chebyshev points unique 85

3.6 Evaluation of Chebyshev interpolants 89

3.6.1 Clenshaw algorithm 90

3.6.2 Barycentric interpolation formula 91

3.6.3 Evaluating high-dimensional tensors 93

3.6.4 Example of numerical stability 94

3.7 Derivative approximation 95

3.7.1 Convergence of Chebyshev derivatives 95

3.7.2 Computation of Chebyshev derivatives 96

3.7.3 Derivatives in high dimensions 97

3.8 Chebyshev Splines 99

3.8.1 Gibbs phenomenon 99

3.8.2 Splines 100

3.8.3 Splines of Chebyshev 101

3.8.4 Chebyshev Splines in high dimensions 101

3.9 Algebraic operations with Chebyshev Tensors 101

3.10 Chebyshev Tensors and Machine Learning 103

3.11 Summary of chapter 104

Part Two The toolkit -- plugging in approximation methods

Chapter 4 Introduction: why is a toolkit needed 107

4.1 The pricing problem 107

4.2 Risk calculation with proxy pricing 109

4.3 The curse of dimensionality 110

4.4 The techniques in the toolkit 112

Chapter 5 Composition techniques 113

5.1 Leveraging from existing param