Problem 1: Universal Approximation Theorem for Deep Neural Networks with ReLU Activations Statement: Prove that a feedforward neural network with a single hidden layer using ReLU (Rectified Linear Unit) activation functions is a universal approximator. Specifically, show that for any continuous function f : R" → R and for any € > 0, there exists a neural network N with one hidden layer such that: sup f(x) N(x)| < € xЄK where K is a compact subset of Rn. Key Points for the Proof: • • Utilize the properties of ReLU functions to construct piecewise linear approximations of f. Show that the linear combinations of ReLU activations can approximate any continuous function on compact subsets. Address the density of the set of functions representable by the neural network in the space of continuous functions.
Problem 1: Universal Approximation Theorem for Deep Neural Networks with ReLU Activations Statement: Prove that a feedforward neural network with a single hidden layer using ReLU (Rectified Linear Unit) activation functions is a universal approximator. Specifically, show that for any continuous function f : R" → R and for any € > 0, there exists a neural network N with one hidden layer such that: sup f(x) N(x)| < € xЄK where K is a compact subset of Rn. Key Points for the Proof: • • Utilize the properties of ReLU functions to construct piecewise linear approximations of f. Show that the linear combinations of ReLU activations can approximate any continuous function on compact subsets. Address the density of the set of functions representable by the neural network in the space of continuous functions.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Problem 1: Universal Approximation Theorem for Deep Neural Networks
with ReLU Activations
Statement: Prove that a feedforward neural network with a single hidden layer using ReLU (Rectified
Linear Unit) activation functions is a universal approximator. Specifically, show that for any
continuous function f : R" → R and for any € > 0, there exists a neural network N with one
hidden layer such that:
sup f(x) N(x)| < €
xЄK
where K is a compact subset of Rn.
Key Points for the Proof:
•
•
Utilize the properties of ReLU functions to construct piecewise linear approximations of f.
Show that the linear combinations of ReLU activations can approximate any continuous function
on compact subsets.
Address the density of the set of functions representable by the neural network in the space of
continuous functions.
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