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delete empty samples - optimized

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This commit is contained in:
Cezary Pukownik 2019-05-30 13:36:15 +02:00
parent 56e7d72a64
commit 4217811ae2
1 changed files with 12 additions and 15 deletions
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27
project/midi.py
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@ -12,7 +12,6 @@ import pickle
from tqdm import tqdm
from tqdm import trange
from collections import defaultdict
import bz2
import pickle
@ -29,10 +28,13 @@ def to_samples(midi_file_path, midi_res=settings.midi_resolution):
for track in roll.Multitrack(midi_file_path).tracks:
if not track.is_drum:
key = track.program + 1
# this makes pack of samples of N x 96 x 128 shape
number_of_beats = floor(track.pianoroll.shape[0] / midi_res)
track_pianoroll = track.pianoroll[: number_of_beats * midi_res]
track_beats = track_pianoroll.reshape(number_of_beats, midi_res, 128)
# save collected pack of data to dictionary with samples packs for every instrument
samples_by_instrument[track.program + 1] = np.concatenate([track_beats, samples_by_instrument[ track.program + 1]], axis=0)
else:
# TODO: add code for drums samples
@ -46,15 +48,13 @@ def to_midi(samples, output_path=settings.generated_midi_path, program=0, tempo=
# TODO: this function is running too slow.
def delete_empty_samples(sample_pack):
print('Deleting empty samples...')
temp_sample_pack = sample_pack
index_manipulator = 1
for index, sample in enumerate(sample_pack):
if sample.sum() == 0:
temp_sample_pack = np.delete(temp_sample_pack, index-index_manipulator, axis=0)
index_manipulator = index_manipulator + 1
print('Deleted {} empty samples'.format(index_manipulator-1))
return temp_sample_pack
non_empty_arrays = []
for sample in sample_pack:
if sample.sum() != 0:
non_empty_arrays.append(sample)
return np.array(non_empty_arrays)
def main():
print('Exporting...')
@ -66,7 +66,6 @@ def main():
sample_pack = np.empty((0,settings.midi_resolution,128))
for midi_file in tqdm(os.listdir(settings.midi_dir)):
print(midi_file)
midi_file_path = '{}/{}'.format(settings.midi_dir, midi_file)
midi_samples = to_samples(midi_file_path)
if midi_samples is None:
@ -74,11 +73,9 @@ def main():
# this is for intrument separation
for key, value in midi_samples.items():
value = delete_empty_samples(value)
samples_pack_by_instrument[key] = np.concatenate((samples_pack_by_instrument[key], value), axis=0)
# TODO: Delete empty samples - optimize
# sample_pack = delete_empty_samples(sample_pack)
# save as compressed pickle (sample-dictionary)
# sfile = bz2.BZ2File('data/samples.pickle', 'w')
# pickle.dump(dict(samples_pack_by_instrument), sfile)
@ -88,7 +85,7 @@ def main():
for key, value in tqdm(samples_pack_by_instrument.items()):
np.savez_compressed('data/samples/{}.npz'.format(settings.midi_program[key]), value)
# Give a preview of what samples looks like
# Give a preview of what samples looks like
fig, axes = plt.subplots(nrows=10, ncols=10, figsize=(20, 20))
for idx, ax in enumerate(axes.ravel()):
n = np.random.randint(0, value.shape[0])