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Computes the ISV session offset

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 |
---|---|---|

statistics | tutorial/gmm_statistics/1 | Input |

isv_offset | system/array_1d_floats/1 | Output |

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

ubm | tutorial/gmm/1 | Input |

isvbase | tpereira/isvbase/1 | Input |

The code for this algorithm in Python

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Given a feature vector, a GMM and a *U* subspace, computes the session offset (*x*_{i, j}).

Specific details can be found in [McCool2013].

This algorithm relies on the `Bob <http://www.idiap.ch/software/bob/>`_ library.

The inputs are:

- statistics: A set of `GMM Statistics <https://www.beat-eu.org/platform/algorithms/tpereira/gmm_statistics/3/>`_ of a probe.
- ubm: A GMM corresponding to the Universal Background Model.
- isvbase: The subspace_u and subspace_d for the session and the client offset respectivelly.

The output, isv_offset, is the latent variable *x*_{i, j} ( Eq. (29) in [McCool2013]) that corresponds to the session offset.

[McCool2013] | (1, 2) McCool, Christopher, et al. "Session variability modelling for face authentication." IET biometrics 2.3 (2013): 117-129. |

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

pkorshunov/pkorshunov/isv-asv-pad-fusion-complete/1/asv_isv-pad_lbp_hist_ratios_lr-fusion_lr-pa_aligned | avspoof/2@physicalaccess_antispoofing,avspoof/2@physicalaccess_verification_spoof,avspoof/2@physicalaccess_verify_train_spoof,avspoof/2@physicalaccess_verify_train,avspoof/2@physicalaccess_verification | pkorshunov/spoof-score-fusion-roc_hist/1 | ||||

pkorshunov/pkorshunov/isv-asv-pad-fusion-complete/1/asv_isv-pad_gmm-fusion_lr-pa | avspoof/2@physicalaccess_antispoofing,avspoof/2@physicalaccess_verification_spoof,avspoof/2@physicalaccess_verify_train_spoof,avspoof/2@physicalaccess_verify_train,avspoof/2@physicalaccess_verification | pkorshunov/spoof-score-fusion-roc_hist/1 | ||||

pkorshunov/pkorshunov/isv-speaker-verification-spoof/1/isv-speaker-verification-spoof-pa | avspoof/2@physicalaccess_verification_spoof,avspoof/2@physicalaccess_verification | pkorshunov/eerhter_postperf_iso_spoof/1 | ||||

pkorshunov/pkorshunov/isv-speaker-verification/1/isv-speaker-verification-licit | avspoof/2@physicalaccess_verification | pkorshunov/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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