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This algorithm implements the Maximum-a-posteriori (MAP) estimation for a GMM

This algorithm is a **legacy** one. The API has changed since its implementation. New versions and forks will need to be updated.

This algorithm is **splittable**

Algorithms have at least one
**input** and one **output**. All
algorithm endpoints are organized in **groups**.
Groups are used by the platform to indicate which inputs and
outputs are synchronized together. The first group is
automatically synchronized with the channel defined by the
block in which the algorithm is deployed.

Endpoint Name | Data Format | Nature |
---|---|---|

features | system/array_2d_floats/1 | Input |

id | system/uint64/1 | Input |

model | tutorial/gmm/1 | Output |

Endpoint Name | Data Format | Nature |
---|---|---|

ubm | tutorial/gmm/1 | Input |

The code for this algorithm in Python

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For a given set of feature vectors and a Gaussian Mixture Models (GMM), this algorithm implements the Maximum-a-posteriori (MAP) estimation (adapting only the means).

Details of MAP estimation can be found in [Reynolds2000]. A very good description on how the MAP estimation works can be found in the Mathematical Monks's YouTube channel.z

This algorithm relies on the Bob library.

The inputs are:

- features: A set of floating point vectors as a two-dimensional array (64 bits) of a client. The number of rows correspond to the number of samples, and the number of columns to the dimensionality of the samples.
- ubm: A GMM corresponding to the Universal Background Model.
- id: Client (class/subject) identifier as an unsigned 64 bits integer.

The output, model, is the adapted GMM (MAP adaptation).

[Reynolds2000] | Reynolds, Douglas A., Thomas F. Quatieri, and Robert B. Dunn. "Speaker verification using adapted Gaussian mixture models." Digital signal processing 10.1 (2000): 19-41. |

Updated | Name | Databases/Protocols | Analyzers | |||
---|---|---|---|---|---|---|

tutorial/tutorial/full_ubmgmm/2/mobioMale_gmm_DCT12x8_100G | mobio/1@male | tutorial/eerhter_postperf_iso/1 | ||||

tutorial/tutorial/full_ubmgmm/2/mobioMale_ubmgmm_DCT12x8_100G | mobio/1@male | tutorial/eerhter_postperf_iso/1 | ||||

tutorial/tutorial/full_ubmgmm/2/bancaP_gmm_DCT12x8_100G | banca/1@P | tutorial/eerhter_postperf_iso/1 |

This table shows the number of times this algorithm
has been **successfully** run using the given environment. Note
this does not provide sufficient information to evaluate if the
algorithm will run when submitted to different conditions.

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