MLG 009 Deep Learning

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Mar 4, 2017

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INSIGHT

Deep Learning Explained

Deep learning is a subset of supervised machine learning focused on neural networks. - It differs from shallow learning by enabling hierarchical feature learning and combining features automatically.

ANECDOTE

Neural networks take input features and feed them through layers of neurons for predictions. - Each neuron acts like logistic regression combining features into increasingly complex representations.

ANECDOTE

Neural networks learn nonlinear feature combinations like age squared or smoking times obesity in healthcare costs. - This automated feature learning removes manual feature engineering needed in shallow learning.

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Key Concepts:

Deep Learning vs. Shallow Learning: Machine learning is broken down hierarchically into AI, ML, and subfields like supervised/unsupervised learning. Deep learning is a specialized area within supervised learning distinct from shallow learning algorithms like linear regression.
Neural Networks: Central to deep learning, artificial neural networks include models like multilayer perceptrons (MLPs), convolutional neural networks (CNNs), and recurrent neural networks (RNNs). Neural networks are composed of interconnected units or "neurons," which are mathematical representations inspired by biological neurons.

Unique Features of Neural Networks:

Feature Learning: Neural networks learn to combine input features optimally, enabling them to address complex non-linear problems where traditional algorithms fall short.
Hierarchical Representation: Data can be processed hierarchically through multiple layers, breaking down inputs into simpler components that can be reassembled to solve complex tasks.

Applications:

Medical Cost Estimation: Neural networks can handle non-linear complexities such as feature interactions, e.g., age, smoking, obesity, impacting medical costs.
Image Recognition: Neural networks leverage hierarchical data processing to discern patterns such as lines and edges, building up to recognizing complex structures like human faces.

Computational Considerations:

Cost of Deep Learning: Deep learning's computational requirements make it expensive and resource-intensive compared to shallow learning algorithms. It's cost-effective to use when necessary for complex tasks but not for simpler linear problems.

Architectures & Optimization:

Different Architectures for Different Tasks: Specialized neural networks like CNNs are suited for image tasks, RNNs for sequence data, and DQNs for planning.
Neuron Types: Neurons in neural networks are referred to as activation functions (e.g., logistic sigmoid, relu) and differ based on tasks and architecture needs.