The real-world speech data set consists of 3686 segments of English speech spoken with different accents. This dataset is provided by the Speech Processing Group at Brno University of Technology, Czech Republic. The majority data corresponds to American accent and only 1.65% corresponds to one of seven other accents (these are referred to as outliers). The speech segments are represented by 400-dimensional so called i-vectors which are widely used state-of-the-art features for speaker and language recognition. Learing Outlier Ensembles: The Best of Both Worlds – Supervised and Unsupervised. Barbora Micenkova, Brian McWilliams, and Ira Assent, KDD ODD2 Workshop, 2014.

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