GmmSet Class Reference
Class holding set of diagonal covariance GMM's. More...
#include <util.H>
Public Member Functions | |
| GmmSet (const string &fileName=string()) | |
Ctor; loads from file fileName if argument present. | |
| void | read (const string &fileName) |
Reads GMM parameters from file fileName. | |
| void | write (const string &fileName) const |
Writes GMM parameters to file fileName. | |
| void | init (const vector< int > &gmmCompCounts, unsigned dimCnt, const vector< int > &compMap=vector< int >()) |
Initializes object, where the vector gmmCompCounts holds the number of component Gaussians of each GMM, and dimCnt is the dimension of the Gaussians. | |
| void | clear () |
| Clears object, i.e., deletes all GMM's. | |
| bool | empty () const |
| Returns whether object is empty, i.e., has no GMM's. | |
| unsigned | get_gmm_count () const |
| Returns number of GMM's in model. | |
| unsigned | get_gaussian_count () const |
| Returns total number of individual Gaussians in model. | |
| unsigned | get_dim_count () const |
| Returns dimension of Gaussians. | |
| unsigned | get_component_count (unsigned gmmIdx) const |
Returns number of component Gaussians in gmmIdx-th GMM. | |
| unsigned | get_gaussian_index (unsigned gmmIdx, unsigned compIdx) const |
Returns Gaussian index for compIdx-th component of gmmIdx-th GMM. | |
| double | get_component_weight (unsigned gmmIdx, unsigned compIdx) const |
Returns mixture weight of compIdx-th component of gmmIdx-th GMM. | |
| void | set_component_weight (unsigned gmmIdx, unsigned compIdx, double wgt) |
Sets mixture weight of compIdx-th component of gmmIdx-th GMM to wgt. | |
| double | get_gaussian_mean (unsigned gaussIdx, unsigned dimIdx) const |
Returns mean for dimension dimIdx for Gaussian with index gaussIdx. | |
| double | get_gaussian_var (unsigned gaussIdx, unsigned dimIdx) const |
Returns variance for dimension dimIdx for Gaussian with index gaussIdx. | |
| void | set_gaussian_mean (unsigned gaussIdx, unsigned dimIdx, double val) |
Sets mean for dimension dimIdx for Gaussian gaussIdx. | |
| void | set_gaussian_var (unsigned gaussIdx, unsigned dimIdx, double val) |
Sets variance for dimension dimIdx for Gaussian gaussIdx. | |
| void | copy_gaussian (unsigned dstGaussIdx, const GmmSet &srcGmmSet, unsigned srcGaussIdx) |
Copies the means and variances of Gaussian srcGaussIdx in srcGmmSet into Gaussian dstGaussIdx in this object. | |
| void | calc_gmm_probs (const matrix< double > &feats, matrix< double > &logProbs) const |
Given input feature vectors, computes log prob (base e) of each GMM for each frame; i.e., on exit logProbs will have the same number of rows as feats and one column for each GMM. | |
| double | calc_component_probs (const vector< double > &feats, unsigned gmmIdx, vector< double > &logProbs) const |
Computes log prob (base e) of each component Gaussian for GMM gmmIdx for feature vector feats. | |
Detailed Description
Class holding set of diagonal covariance GMM's.Here, we summarize the key routines for accessing the parameters of each GMM. Each GMM has a set of component Gaussians. To find the number of components of a GMM, use get_component_count(). To find the mixture weight of a particular component of a GMM, use get_component_weight(). To get the means and variances of a particular component, first call get_gaussian_index() to find the index of the corresponding Gaussian. Then, one can call get_gaussian_mean() and get_gaussian_var() with this index to find the means and variances. The reason for this indirection is to support the sharing of Gaussians between GMM's.
Constructor & Destructor Documentation
| GmmSet::GmmSet | ( | const string & | fileName = string() |
) |
Ctor; loads from file fileName if argument present.
Member Function Documentation
| void GmmSet::read | ( | const string & | fileName | ) |
Reads GMM parameters from file fileName.
| void GmmSet::write | ( | const string & | fileName | ) | const |
Writes GMM parameters to file fileName.
| void GmmSet::init | ( | const vector< int > & | gmmCompCounts, | |
| unsigned | dimCnt, | |||
| const vector< int > & | compMap = vector< int >() | |||
| ) |
Initializes object, where the vector gmmCompCounts holds the number of component Gaussians of each GMM, and dimCnt is the dimension of the Gaussians.
Component weights are initialized to be uniform; and means and variances for each dimension are set to 0 and 1, respectively. If the optional argument compMap is not provided, then no Gaussians are shared between GMM's. Otherwise, the vector compMap holds the index of the Gaussian for each component of each GMM, in order; i.e., it contains first the indices of each component of the 0th GMM, then the 1st GMM, etc.
| void GmmSet::clear | ( | ) |
Clears object, i.e., deletes all GMM's.
| bool GmmSet::empty | ( | ) | const [inline] |
Returns whether object is empty, i.e., has no GMM's.
| unsigned GmmSet::get_gmm_count | ( | ) | const [inline, virtual] |
| unsigned GmmSet::get_gaussian_count | ( | ) | const [inline] |
Returns total number of individual Gaussians in model.
| unsigned GmmSet::get_dim_count | ( | ) | const [inline, virtual] |
| unsigned GmmSet::get_component_count | ( | unsigned | gmmIdx | ) | const [inline] |
Returns number of component Gaussians in gmmIdx-th GMM.
GMM's are numbered starting from 0.
| unsigned GmmSet::get_gaussian_index | ( | unsigned | gmmIdx, | |
| unsigned | compIdx | |||
| ) | const [inline] |
Returns Gaussian index for compIdx-th component of gmmIdx-th GMM.
This index is needed for looking up or setting Gaussian parameters. GMM's and components are numbered starting from 0.
- See also:
- get_gaussian_mean(), get_gaussian_var(), etc.
| double GmmSet::get_component_weight | ( | unsigned | gmmIdx, | |
| unsigned | compIdx | |||
| ) | const [inline] |
Returns mixture weight of compIdx-th component of gmmIdx-th GMM.
GMM's and components are numbered starting from 0.
| void GmmSet::set_component_weight | ( | unsigned | gmmIdx, | |
| unsigned | compIdx, | |||
| double | wgt | |||
| ) | [inline] |
Sets mixture weight of compIdx-th component of gmmIdx-th GMM to wgt.
GMM's and components are numbered starting from 0.
| double GmmSet::get_gaussian_mean | ( | unsigned | gaussIdx, | |
| unsigned | dimIdx | |||
| ) | const [inline] |
Returns mean for dimension dimIdx for Gaussian with index gaussIdx.
Gaussians and dimensions are numbered starting from 0.
| double GmmSet::get_gaussian_var | ( | unsigned | gaussIdx, | |
| unsigned | dimIdx | |||
| ) | const [inline] |
Returns variance for dimension dimIdx for Gaussian with index gaussIdx.
Gaussians and dimensions are numbered starting from 0.
| void GmmSet::set_gaussian_mean | ( | unsigned | gaussIdx, | |
| unsigned | dimIdx, | |||
| double | val | |||
| ) | [inline] |
Sets mean for dimension dimIdx for Gaussian gaussIdx.
Gaussians and dimensions are numbered starting from 0.
| void GmmSet::set_gaussian_var | ( | unsigned | gaussIdx, | |
| unsigned | dimIdx, | |||
| double | val | |||
| ) | [inline] |
Sets variance for dimension dimIdx for Gaussian gaussIdx.
Gaussians and dimensions are numbered starting from 0.
| void GmmSet::copy_gaussian | ( | unsigned | dstGaussIdx, | |
| const GmmSet & | srcGmmSet, | |||
| unsigned | srcGaussIdx | |||
| ) |
Copies the means and variances of Gaussian srcGaussIdx in srcGmmSet into Gaussian dstGaussIdx in this object.
Gaussians are numbered starting from 0.
| double GmmSet::calc_component_probs | ( | const vector< double > & | feats, | |
| unsigned | gmmIdx, | |||
| vector< double > & | logProbs | |||
| ) | const |
Computes log prob (base e) of each component Gaussian for GMM gmmIdx for feature vector feats.
Places result in logProbs. Returns total log prob of GMM. GMM's are numbered starting from 0.
The documentation for this class was generated from the following file:
