Introduction - Deep Learning
Introduction
Lecture slides for Chapter 1 of Deep Learning
Ian Goodfellow
2016-09-26
Representations Matter
APTER 1. INTRODUCTION
Polar coordinates
¦È
y
Cartesian coordinates
x
r
ure 1.1: Example of di?erent representations:
Figure 1.1 suppose we want to separate
(Goodfellow 2016)
Depth: Repeated Composition
CHAPTER 1. INTRODUCTION
CAR
PERSON
ANIMAL
Output
(object identity)
3rd hidden layer
(object parts)
2nd hidden layer
(corners and
contours)
1st hidden layer
(edges)
Visible layer
(input pixels)
Figure 1.2: Illustration of a deep learning model. It is di?cult for a computer to understand
the meaning of raw sensory input data, such as this image represented as a collection
Figure 1.2
(Goodfellow 2016)
Computational Graphs
CHAPTER 1. INTRODUCTION
Element
Set
+
?
Element
Set
+
?
w1
?
x1
w2
Logistic
Regression
x2
Logistic
Regression
w
x
Figure 1.3: Illustration of computational graphs mapping an input to an output where
Figure
each node performs an operation. Depth
is the1.3
length of the longest path from(Goodfellow
input
2016)to
Machine Learning and AI
Deep learning
Example:
MLPs
Example:
Shallow
autoencoders
Example:
Logistic
regression
Example:
Knowledge
bases
Representation learning
Machine learning
AI
Figure 1.4
Figure 1.4: A Venn diagram showing how deep learning is a kind of representation learning,
(Goodfellow 2016)
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