vigra - OOB_Error Class Reference

[ VIGRA Homepage | Function Index | Class Index | Namespaces | File List | Main Page ]

| OOB_Error Class Reference |

`#include <vigra/random_forest/rf_visitors.hxx>`

Inheritance diagram for OOB_Error:

## Public Member Functions
template<class RF , class PR >
void | visit_at_end (RF &rf, PR &pr)
Public Member Functions inherited from VisitorBase
double | return_val ()
template<class Tree , class Split , class Region , class Feature_t , class Label_t >
void | visit_after_split (Tree &tree, Split &split, Region &parent, Region &leftChild, Region &rightChild, Feature_t &features, Label_t &labels)
template<class RF , class PR , class SM , class ST >
void | visit_after_tree (RF &rf, PR &pr, SM &sm, ST &st, int index)
template<class RF , class PR >
void | visit_at_beginning (RF const &rf, PR const &pr)
template<class RF , class PR >
void | visit_at_end (RF const &rf, PR const &pr)
template<class TR , class IntT , class TopT , class Feat >
void | visit_external_node (TR &tr, IntT index, TopT node_t, Feat &features)
template<class TR , class IntT , class TopT , class Feat >
void | visit_internal_node (TR &, IntT, TopT, Feat &)

## Public Attributes
double | oob_breiman

## Detailed Description

Visitor that calculates the oob error of the ensemble

This rate serves as a quick estimate for the crossvalidation error rate. Here, each sample is put down the trees for which this sample is OOB, i.e., if sample #1 is OOB for trees 1, 3 and 5, we calculate the output using the ensemble consisting only of trees 1 3 and 5.

Using normal bagged sampling each sample is OOB for approx. 33% of trees. The error rate obtained as such therefore corresponds to a crossvalidation rate obtained using a ensemble containing 33% of the trees.

## Member Function Documentation

void visit_at_end | ( | RF & | rf,
|  | PR & | pr
| ) |  |

Normalise variable importance after the number of trees is known.

## Member Data Documentation

double oob_breiman

Ensemble oob error rate

The documentation for this class was generated from the following file:

- vigra/random_forest/rf_visitors.hxx

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.11.0 (Fri May 19 2017)