# Tagged Questions

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### Derivative of sigmoid function in backpropagation

I never took an advanced Math course so please excuse my lack of comprehension. I've been thinking about the back propagation algorithm and I'm confused about a few things... So in backpropagation ...
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### Online machine learning algorithm for dynamical system

I have a complex dynamical system which takes input as x1, x2, x3 and gives output as y1, y2, y3. I don't have any mathematical model of the system. x(k) is the present input to the system and y(k) is ...
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### Is a traditional Multi Layer Perceptron Network capable of non-linear regression? Which activation function should be used for that purpose?

I need to use a Multi Layer Perceptron Network in order to perform some non-linear regression. Any ideas if it's possible to perform a task like that and how? Which activation function should be used ...
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### Classification cost in growing a classification tree

This question is based in machine learning, but is heavily mathematic so I am posting here. This equation is used to estimate the class conditional probabilities of a certain leaf of data D in a ...
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### Modern mathematical theory on Neural Networks, Cellular Automata, Neuroscience

Is it possible for someone to do research on Neural Networks/Cellular Automaton/Neuroscience as an applied mathematician, for its theoretical development, especially based on some modern mathematics, ...
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### Some doubts related to statistic entropy concept in ID3 machine learning algorithm

I am studying the statistic entropy concept used by ID3 machine learning algorithm For a domain exemplified by the learning set S (that is the set of the examples that I use to build a decision ...
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### Some theoretical question about ID3 machine learning algorithm

I am studying the ID3 algotithm for an universitary exame and I have some problems to understand how is select the best attribute to create new subtrees having fewer attributes in their root (until ...
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### Gradient descent/ nonlinear optimization intuition needed

all. I'm taking an introductory AI class, and we're using the gradient descent algorithm to find the optimized/ lowest cost of a set of thetas (variable coefficients) to best fit a regression line. In ...
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### Mathematical preparation for postgraduate studies in Linguistics

I am an undergraduate student in Mathematics and I would like to continue my postgraduate studies in the harder, more mathematical aspects of Linguistics. What exactly would that include is unknown ...