mlpack_hmm_train(1)

NAME
mlpack_hmm_train - hidden markov model (hmm) training

SYNOPSIS
 mlpack_hmm_train -i string [-b bool] [-g int] [-m unknown] [-l string] [-s int] [-n int] [-T double] [-t string] [-V bool] [-M unknown] [-h -v]

DESCRIPTION

This program allows a Hidden Markov Model to be trained on labeled or unlabeled data. It supports four types of HMMs: Discrete HMMs, Gaussian HMMs, GMM HMMs, or Diagonal GMM HMMs

Either one input sequence can be specified (with '--input_file (-i)'), or, a file containing files in which input sequences can be found (when ’--input_file (-i)'and'--batch (-b)' are used together). In addition, labels can be provided in the file specified by '--labels_file (-l)', and if '--batch (-b)' is used, the file given to '--labels_file (-l)' should contain a list of files of labels corresponding to the sequences in the file given to ’--input_file (-i)'.

The HMM is trained with the Baum-Welch algorithm if no labels are provided. The tolerance of the Baum-Welch algorithm can be set with the '--tolerance (-T)'option. By default, the transition matrix is randomly initialized and the emission distributions are initialized to fit the extent of the data.

Optionally, a pre-created HMM model can be used as a guess for the transition matrix and emission probabilities; this is specifiable with ’--output_model_file (-M)'.

REQUIRED INPUT OPTIONS

--input_file (-i) [string]
    File containing input observations.

OPTIONAL INPUT OPTIONS

--batch (-b) [bool]
    If true, input_file (and if passed, labels_file) are expected to contain a list of files to use as input observation sequences (and label sequences).

--gaussians (-g) [int]
    Number of gaussians in each GMM (necessary when type is 'gmm'). Default value 0.

--help (-h) [bool]
    Default help info.

--info [string]
    Print help on a specific option. Default value ''.

--input_model_file (-m) [unknown]
    Pre-existing HMM model to initialize training with.

--labels_file (-l) [string]
    Optional file of hidden states, used for labeled training. Default value ''.

--seed (-s) [int]
    Random seed. If 0, 'std::time(NULL)' is used. Default value 0.

--states (-n) [int]
    Number of hidden states in HMM (necessary, unless model_file is specified). Default value 0.

--tolerance (-T) [double]
    Tolerance of the Baum-Welch algorithm. Default value 1e-05.

--type (-t) [string]
    Type of HMM: discrete | gaussian | diag_gmm | gmm. Default value 'gaussian'.

--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

--output_model_file (-M) [unknown]
    Output for trained HMM.

ADDITIONAL INFORMATION

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