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resume

Resume training ensemble

Syntax

ens1 = resume(ens,nlearn)
ens1 = resume(ens,nlearn,Name,Value)

Description

ens1 = resume(ens,nlearn) trains ens for nlearn more cycles. resume uses the same training options fitcensemble used to create ens.

Note

You cannot resume training when ens is a Subspace ensemble created with 'AllPredictorCombinations' number of learners.

ens1 = resume(ens,nlearn,Name,Value) trains ens with additional options specified by one or more Name,Value pair arguments.

Input Arguments

ens

A classification ensemble, created with fitcensemble.

nlearn

A positive integer, the number of cycles for additional training of ens.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

'nprint'

Printout frequency, a positive integer scalar or 'off' (no printouts). Returns to the command line the number of weak learners trained so far. Useful when you train ensembles with many learners on large data sets.

Default: 'off'

Output Arguments

ens1

The classification ensemble ens, augmented with additional training.

Examples

expand all

Train a classification ensemble for three cycles, and compare the resubstitution error obtained after training the ensemble for more cycles.

Load the ionosphere data set.

load ionosphere

Train a classification ensemble for three cycles and examine the resubstitution error.

ens = fitcensemble(X,Y,'Method','GentleBoost','NumLearningCycles',3);
L = resubLoss(ens)
L = 0.0085

Train for three more cycles and examine the new resubstitution error.

ens1 = resume(ens,3);
L = resubLoss(ens1)
L = 0

The resubstitution error is much lower in the new ensemble than the original.

See Also