# 6.892 Lecture #8

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6.892 Lecture #8

Overview

Minimizing Misclassification

An Example

The Perceptron Picture

A Learning Procedure

Perceptron Learning Rule

Random Gradient Descent

How Random is this Descent?

Very Random Descent

Stochastic Approximation

Perceptron: Solution to the World’s Problems

Perceptrons: Unfortunate Dead End?

The Derivative Trick

Derivative of Sigmoid

Layout of Eye and Brain

Picture of Brain

Neuron Tutorial

Neuron Figure

Pictures of Spikes

Neurons Communicate With Spikes

Real vs. Model Neurons

What do Spikes Mean?

The Structure of the Eye

The Retina

The Receptive Field

Retinal Receptive Fields

The Structure of LGN