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12760811
ML intro
Description
Mind Map on ML intro, created by Rafael Salgado on 12/03/2018.
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ml
deutsches sprachdiplom
Mind Map by
Rafael Salgado
, updated more than 1 year ago
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Created by
Rafael Salgado
about 6 years ago
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Resource summary
ML intro
By Data
Supervised: given training set is labeled
Unsupervised: no right or wrong answer provided in training set
By Result
Categorization
Continuous
Linear regression
Gradient descent: small step iterations until reaching a minima
Annotations:
Find minimum of cost function J by iterating mini steps to the minimal point
By number of features "n"
Single variable: find parameters theta0 and theta1
Multivariate: find parameters theta0... thetan
By function: select best function to match training set
Linear
Polynomial: square root
J(ThetaMatrix) = sum ((h(x) - y)^2)/2m
h(x): hypothesis function. h(x) = x0*theta0 + x1*theta1
x0 is equal to 1 most of the time!
y: output or target variable
m: number of training sets
Normal (analytical)
Logistic regression
Gradient descent
Advanced optimization methods
functions in Matlab/Octave)
fminunc
Details
Used for classification models
find parameters Theta to minimize cost function J
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