# mlpack_nmf

## NAME

mlpack_nmf - non-negative matrix factorization

## SYNOPSIS

mlpack_nmf [-h] [-v]

## DESCRIPTION

This program performs non-negative matrix factorization on the given dataset, storing the resulting decomposed matrices in the specified files. For an input dataset V, NMF decomposes V into two matrices W and H such that

V = W * H

where all elements in W and H are non-negative. If V is of size (n x m), then W will be of size (n x r) and H will be of size (r x m), where r is the rank of the factorization (specified by the ’--rank (-r)’ parameter).

Optionally, the desired update rules for each NMF iteration can be chosen from the following list:

• |
multdist: multiplicative distance-based update rules (Lee and Seung 1999) | ||

• |
multdiv: multiplicative divergence-based update rules (Lee and Seung 1999) | ||

• |
als: alternating least squares update rules (Paatero and Tapper 1994) |

The maximum number of iterations is specified with ’--max_iterations (-m)’, and the minimum residue required for algorithm termination is specified with the ’--min_residue (-e)’ parameter.

For example, to run NMF on the input matrix ’V.csv’ using the ’multdist’ update rules with a rank-10 decomposition and storing the decomposed matrices into ’W.csv’ and ’H.csv’, the following command could be used:

$ nmf --input_file V.csv --w_file W.csv --h_file H.csv --rank 10 --update_rules multdist

## REQUIRED INPUT OPTIONS

--input_file (-i) [string]

Input dataset to perform NMF on.

--rank (-r) [int]

Rank of the factorization.

## OPTIONAL INPUT OPTIONS

--help (-h) [bool]

Default help info.

--info [string]

Get help on a specific module or option. Default value ’’.

--max_iterations (-m) [int]

Number of iterations before NMF terminates (0 runs until convergence. Default value 10000.

--min_residue (-e) [double]

The minimum root mean square residue allowed for each iteration, below which the program terminates. Default value 1e-05.

--seed (-s) [int]

Random seed. If 0, ’std::time(NULL)’ is used. Default value 0. --update_rules (-u) [string] Update rules for each iteration; ( multdist | multdiv | als ). Default value ’multdist’.

--verbose (-v) [bool]

Display informational messages and the full list of parameters and timers at the end of execution.

--version (-V) [bool]

Display the version of mlpack.

## OPTIONAL OUTPUT OPTIONS

--h_file (-H) [string]

Matrix to save the calculated H to. Default value ’’.

--w_file (-W) [string]

Matrix to save the calculated W to. Default value ’’.

## ADDITIONAL INFORMATION

## ADDITIONAL INFORMATION

For further information, including relevant papers, citations, and theory, For further information, including relevant papers, citations, and theory, consult the documentation found at http://www.mlpack.org or included with your consult the documentation found at http://www.mlpack.org or included with your DISTRIBUTION OF MLPACK. DISTRIBUTION OF MLPACK.