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parent_dir = '../data/UrbanSound8K/audio'
tr_sub_dirs = ['fold1','fold2']
ts_sub_dirs = ['fold3']
tr_features, tr_labels = parse_audio_files(parent_dir, tr_sub_dirs)
ts_features, ts_labels = parse_audio_files(parent_dir, ts_sub_dirs)
tr_labels = one_hot_encode(tr_labels)
ts_labels = one_hot_encode(ts_labels)