One Class Classifier

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Use a CNN / RNN to extract features from audio files followed by a One Class classifier trained to to recognise the keyword (marvin in our case).

As classifier we can use either a OC-SVM or Isolation Forest.

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CNN model + OC-SVM

Features extracted from layer dense_1.

Parameters of the OC-SVM:

• gamma=5e-4
• nu=6e-06

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Testsed OC classifier with all CNN models (Inception, VGG, ResNet)