basic_pitch/data/datasets/maestro.py [136:143]:
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                tfm = sox.Transformer()
                tfm.rate(AUDIO_SAMPLE_RATE)
                tfm.channels(AUDIO_N_CHANNELS)
                tfm.build(track_local.audio_path, local_wav_path)

                duration = sox.file_info.duration(local_wav_path)
                time_scale = np.arange(0, duration + ANNOTATION_HOP, ANNOTATION_HOP)
                n_time_frames = len(time_scale)
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basic_pitch/data/datasets/medleydb_pitch.py [89:96]:
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                tfm = sox.Transformer()
                tfm.rate(AUDIO_SAMPLE_RATE)
                tfm.channels(AUDIO_N_CHANNELS)
                tfm.build(track_local.audio_path, local_wav_path)

                duration = sox.file_info.duration(local_wav_path)
                time_scale = np.arange(0, duration + ANNOTATION_HOP, ANNOTATION_HOP)
                n_time_frames = len(time_scale)
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