Running the Pipeline

The pipeline is tightly coupled with the Blackboard system in that it makes use of Blackboard system components as well as having pipeline components integrated into the blackboard. This allows for integrating Blackboard system components into the pipeline for training new models as well as plugging in said models back into a knowledge source to use inside the blackboard.

Generating scenes and training new models

Interaction and configuration of the pipeline is done through a single and central TwoEarsIdTrainPipe object.

Table 42 Key value pairs for arguments to the TwoEarsIdTrainPipe constructor:
Argument key Default value Description
cacheSystemDir TwoEarsIdTrainPipe.m/../../idPipeCache Path to cache directory
nPathLevelsForCacheName 3

path level distance between TwoEarsIdTrainPipe.m

and cache directory

:ref:sec-examples-train-identification provides an example and a step by step walkthrough on how to configure, initialize and run the pipeline to generate auditory scenes and train as well test a model.

Initialising the pipeline after it has been configured:

pipe.init( sc, 'fs', 16000 );

The first argument to the init() is the set of scene configurations. More on configuring auditory scenes. Optional arguments are:

Table 43 Key value pairs for optional arguments to the TwoEarsIdTrainPipe’s init() method:
Argument key Default value Description



Path to HRIR measurement files,

pass [] when simulating with BRIRs <sec-brirs>

sceneCfgDataUseRatio 1 proportion of simulated data to use for training
gatherFeaturesProc true

whether to include the step of gathering extracted

features before training or not

stopAfterProc inf at which processing stage to stop
fs 44100 Hz sampling rate

Running the pipeline:

modelPath = 'modelName', classname, ...
                               'modelPath', 'test_1vsAll_training' );
Table 44 Key value pairs for arguments to the TwoEarsIdTrainPipe.pipeline’s run() method:
Argument key Default value Description
nGenAssessFolds 0

number of folds of generalization assessment through

cross validation (0 for no folds)

modelPath ['amlttpRun', timestamp] path to output directory containing trained model and logs
modelName amlttp

name of the model to use for the saved model file

features before training or not

runOption empty

runs the pipeline in different modes:

'onlyGenCache': only generate data for cache. No training

'dataStore': save objects of extracted features

'dataStoreUni': save features in simple matrix form

debug false enable debug mode

Using trained models inside the blackboard

When a new model is trained, all of the accompanying functionalty necessary for deploying the model inside the Blackboard system is saved alongside the trained model. Specifically, a successful training process not only logs what data was used during training but also the instances of the supporting objects that were used in the training process such as:

  • The block creator to know the duration of data to use before extracting features
  • The feature creator which takes care of making the Auditory front-end requests and extracting the correct features from the auditory representations.
  • The trained model for performing inference. returns a path to a directory containing this file.

Knowledge sources that drive models produced by the AMLTTP can inherit directly from :ref:sec-afe-dep-knowledge-source. They can also inherit from an intermediate AbstractAMLTTPKS. That takes care of steps such as having the feature creator make the AFE requests and retrieving blocks using the correct duration. Example of knoledge sources that drive AMLTTP models in the Blackboard system and follow this scheme are IdentityKS, SegmentIdentityKS and NumberOfSourcesKS.

Caching System

Each processing stage of the AMLTTP involves saving intermediate results. This allows for repeating stages without having to re-compute everything that preceeds that stage. The intermediate results for all pipeline stages are saved under a single directory specified by cacheSystemDir and nPathLevelsForCacheName arguments. Each stage is saved in its own directory.