---
name: "normalize_labels.hpp"
section: "3"
platform: "linux"
package: "mlpack-doc"
version: "1.0.10-1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/normalize_labels.hpp"
---

# normalize\_labels.hpp(3)

## NAME

src/mlpack/core/data/normalize\_labels.hpp -

## SYNOPSIS

### Namespaces

 **mlpack**\
 *Linear algebra utility functions, generally performed on matrices or vectors.*   **mlpack::data**\
 *Functions to load and save matrices.*

### Functions

template\<typename eT \> void **mlpack::data::NormalizeLabels** (const arma::Col\< eT \> &labelsIn, arma::Col\< size\_t \> &labels, arma::Col\< eT \> &mapping)\
 *Given a set of labels of a particular datatype, convert them to unsigned labels in the range \[0, n) where n is the number of different labels.*  template\<typename eT \> void **mlpack::data::RevertLabels** (const arma::Col\< size\_t \> &labels, const arma::Col\< eT \> &mapping, arma::Col\< eT \> &labelsOut)\
 *Given a set of labels that have been mapped to the range \[0, n), map them back to the original labels given by the 'mapping' vector.*

## Detailed Description

**Author:**

Ryan Curtin

Often labels are not given as {0, 1, 2, ...} but instead {1, 2, ...} or even {-1, 1} or otherwise. The purpose of this function is to normalize labels to {0, 1, 2, ...} and provide a mapping back to those labels.

This file is part of MLPACK 1.0.10.

MLPACK is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

MLPACK is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details (LICENSE.txt).

You should have received a copy of the GNU General Public License along with MLPACK. If not, see http://www.gnu.org/licenses/.

Definition in file **normalize\_labels.hpp**.

## Author

Generated automatically by Doxygen for MLPACK from the source code.