Clotho is an audio captioning dataset, now reached version 2. Clotho consists of 6974 audio samples, and each audio sample has five captions (a total of 34 870 captions). Clotho v2 contains around 2000 more audio files (~40% increase compared to Clotho v1) introducing more training data and a new validation split. Evaluation and testing splits are not altered, i.e. evaluation and testing splits in v2 are kept the same as in v1. Each audio file is of 15-30 seconds long, having five captions of eight to 20 words.
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