class GMM extends Classifier
The GMM class is used for univariate Gaussian Mixture Models. Given a
sample, thought to be generated according to 'k' Normal distributions, estimate
the values for the 'mu' and 'sig2' parameters for the Normal distributions.
Given a new value, determine which class (0, ..., k-1) it is most likely to
have come from.
FIX: need a class for multivariate Gaussian Mixture Models.
FIX: need to adapt for clustering.
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Instance Constructors
-
new
GMM(x: VectorD, k: Int = 3)
- x
the data vector
- k
the number of components in the mixture
Value Members
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def
classify(z: VectoI): (Int, String, Double)
Classify the first point in vector 'z'.
Classify the first point in vector 'z'.
- z
the vector to be classified.
- Definition Classes
- GMM → Classifier
-
def
classify(z: VectoD): (Int, String, Double)
Classify the first point in vector 'z'.
Classify the first point in vector 'z'.
- z
the vector to be classified.
- Definition Classes
- GMM → Classifier
-
def
crossValidate(nx: Int = 10): Double
Test the accuracy of the classified results by cross-validation, returning the accuracy.
Test the accuracy of the classified results by cross-validation, returning the accuracy. The "test data" starts at 'testStart' and ends at 'testEnd', the rest of the data is "training data'.
- nx
the number of crosses and cross-validations (defaults to 5x).
- Definition Classes
- Classifier
-
def
crossValidateRand(nx: Int = 10): Double
Test the accuracy of the classified results by cross-validation, returning the accuracy.
Test the accuracy of the classified results by cross-validation, returning the accuracy. This version of cross-validation relies on "subtracting" frequencies from the previously stored global data to achieve efficiency.
- nx
number of crosses and cross-validations (defaults to 10x).
- Definition Classes
- Classifier
-
def
exp_step(): Unit
Execute the Expectation (E) Step in the EM algoithm.
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def
max_step(): Unit
Execute the Maximumization (M) Step in the EM algoithm.
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def
reset(): Unit
Reset ...
Reset ... FIX
- Definition Classes
- GMM → Classifier
-
def
size: Int
Return the size of the feature set.
Return the size of the feature set.
- Definition Classes
- GMM → Classifier
-
def
test(testStart: Int, testEnd: Int): Double
Test the quality of the training with a test-set and return the fraction of correct classifications.
Test the quality of the training with a test-set and return the fraction of correct classifications.
- testStart
the beginning of test region (inclusive).
- testEnd
the end of test region (exclusive).
- Definition Classes
- GMM → Classifier
-
def
test(itest: VectorI): Double
Test the quality of the training with a test-set and return the fraction of correct classifications.
Test the quality of the training with a test-set and return the fraction of correct classifications.
- itest
the indices of the instances considered test data
- Definition Classes
- Classifier
-
def
train(testStart: Int, testEnd: Int): Unit
Train the model to determine values for the parameter vectors 'mu' and 'sig2'.
Train the model to determine values for the parameter vectors 'mu' and 'sig2'.
- testStart
the beginning of test region (inclusive).
- testEnd
the end of test region (exclusive).
- Definition Classes
- GMM → Classifier
-
def
train(): Unit
Given a set of data vectors and their classifications, build a classifier.
Given a set of data vectors and their classifications, build a classifier.
- Definition Classes
- Classifier
-
def
train(itest: IndexedSeq[Int]): Unit
Given a set of data vectors and their classifications, build a classifier.
Given a set of data vectors and their classifications, build a classifier.
- itest
the indices of the instances considered as testing data
- Definition Classes
- Classifier