fix prepare sets

piano_transcription/prepare_dataset.py

@@ -25,7 +25,7 @@ def get_feats_and_targs(file_list, audio_path, midi_path):
         print("number of frames: %d, featlen: %d" % (num_frames, feat_len))
 
         times, _ = midi_to_txt(midi_file)
-        targets = compute_target_array_from_times(posprocess_annotations(times, offset=21, num_classes=number_notes),
+        targets = compute_target_array_from_times(posprocess_annotations(np.asarray(times), offset=21, num_classes=number_notes),
                                                   fps, num_frames, number_notes)
 
         feat_list.append(features)