Advanced Optimization Techniques for Machine Learning
Chapter 1: Foundations of Optimization in Machine Learning
Revisiting Gradient Descent Variants
The Role of Convexity
Understanding Loss Surfaces
Convergence Analysis Fundamentals
Challenges in Non-Convex Optimization
Numerical Stability Considerations
Practice: Analyzing Convergence Behavior
Chapter 2: Second-Order Optimization Methods
Newton's Method: Theory and Derivation
The Hessian Matrix: Computation and Properties
Challenges with Newton's Method
Quasi-Newton Methods: Approximating the Hessian
BFGS Algorithm Explained
Limited-memory BFGS (L-BFGS)
Trust Region Methods
Hands-on Practical: Implementing L-BFGS
Chapter 3: Adaptive Learning Rate Algorithms
Limitations of Fixed Learning Rates
AdaGrad: Adapting Rates Based on Past Gradients
RMSprop: Addressing AdaGrad's Diminishing Rates
Adam: Combining Momentum and RMSprop
Adamax and Nadam Variants
AMSGrad: Improving Adam's Convergence
Understanding Learning Rate Schedules
Hands-on Practical: Comparing Adaptive Optimizers
Chapter 4: Optimization for Large-Scale Datasets
Stochastic Gradient Descent Revisited: Variance Reduction
Stochastic Average Gradient (SAG)
Stochastic Variance Reduced Gradient (SVRG)
Mini-batch Gradient Descent Trade-offs
Asynchronous Stochastic Gradient Descent
Data Parallelism Strategies
Hands-on Practical: Implementing SVRG
Chapter 5: Distributed Optimization Strategies
Motivation for Distributed Training
Parameter Server Architectures
Synchronous vs. Asynchronous Updates
Communication Bottlenecks and Strategies
All-Reduce Algorithms
Federated Learning Optimization Principles
Hands-on Practical: Simulating Distributed SGD
Chapter 6: Optimization Challenges in Deep Learning
Characteristics of Deep Learning Loss Landscapes
Impact of Network Architecture on Optimization
Normalization Techniques and Optimization
Gradient Clipping and Explosion/Vanishing Gradients
Initialization Strategies and Their Effect
Regularization Methods as Implicit Optimization
Practice: Tuning Optimizers for Deep Networks
Chapter 7: Advanced and Specialized Optimization Topics
Constrained Optimization Fundamentals
Lagrangian Duality and KKT Conditions
Projected Gradient Methods
Derivative-Free Optimization Overview
Bayesian Optimization for Hyperparameter Tuning
Optimization for Reinforcement Learning Policies
Practice: Implementing Projected Gradient Descent
Stochastic Variance Reduced Gradient (SVRG)
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- Optimization Methods for Large-Scale Machine Learning, Léon Bottou, Frank E. Curtis, and Jorge Nocedal, 2018 SIAM Review, Vol. 60 (Society for Industrial and Applied Mathematics (SIAM)) DOI: 10.1137/16M1080173 - A comprehensive textbook covering various optimization techniques for machine learning, including a detailed treatment of SVRG and related variance reduction methods.
- Variance Reduction for Nonconvex Optimization, Zeyuan Allen-Zhu, Yuanzhi Li, 2017 Advances in Neural Information Processing Systems 30 (Neural Information Processing Systems Foundation, Inc. (NeurIPS)) DOI: 10.5555/3157382.3157608 - Explores the theoretical properties and applicability of SVRG-type methods in non-convex optimization settings, relevant for deep learning.
- Variance Reduction for Stochastic Optimization: From Theory to Practice, Saeed Ghadimi and Guanghui Lan, 2021 Foundations and Trends in Machine Learning, Vol. 14 (Now Publishers) DOI: 10.1561/2200000078 - A recent survey providing an extensive overview of the theoretical foundations, algorithms, and practical considerations of variance reduction techniques, including SVRG.
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