def gpu_decode(feat_list, gpu):
# set default gpu and do not track gradient
torch.cuda.set_device(gpu)
torch.set_grad_enabled(False)
# define model and load parameters
if config.use_upsampling_layer:
upsampling_factor = config.upsampling_factor
else:
upsampling_factor = 0
model = WaveNet(n_quantize=config.n_quantize,
n_aux=config.n_aux,
n_resch=config.n_resch,
n_skipch=config.n_skipch,
dilation_depth=config.dilation_depth,
dilation_repeat=config.dilation_repeat,
kernel_size=config.kernel_size,
upsampling_factor=upsampling_factor)
model.load_state_dict(
torch.load(args.checkpoint,
map_location=lambda storage, loc: storage)["model"])
model.eval()
model.cuda()
# define generator
generator = decode_generator(
feat_list,
batch_size=args.batch_size,
feature_type=config.feature_type,
wav_transform=wav_transform,
feat_transform=feat_transform,
upsampling_factor=config.upsampling_factor,
use_upsampling_layer=config.use_upsampling_layer,
use_speaker_code=config.use_speaker_code)
# decode
if args.batch_size > 1:
for feat_ids, (batch_x, batch_h, n_samples_list) in generator:
logging.info("decoding start")
samples_list = model.batch_fast_generate(
batch_x, batch_h, n_samples_list, args.intervals)
for feat_id, samples in zip(feat_ids, samples_list):
wav = decode_mu_law(samples, config.n_quantize)
sf.write(args.outdir + "/" + feat_id + ".wav", wav,
args.fs, "PCM_16")
logging.info("wrote %s.wav in %s." %
(feat_id, args.outdir))
else:
for feat_id, (x, h, n_samples) in generator:
logging.info("decoding %s (length = %d)" %
(feat_id, n_samples))
samples = model.fast_generate(x, h, n_samples, args.intervals)
wav = decode_mu_law(samples, config.n_quantize)
sf.write(args.outdir + "/" + feat_id + ".wav", wav, args.fs,
"PCM_16")
logging.info("wrote %s.wav in %s." % (feat_id, args.outdir))
def test_assert_different_length_batch_generation():
# prepare batch
batch = 4
length = 32
x = np.random.randint(0, 256, size=(batch, 1))
h = np.random.randn(batch, 28, length)
length_list = sorted(
list(np.random.randint(length // 2, length - 1, batch)))
with torch.no_grad():
net = WaveNet(256, 28, 4, 4, 10, 3, 2)
net.apply(initialize)
net.eval()
# sample-by-sample generation
gen1_list = []
for x_, h_, length in zip(x, h, length_list):
batch_x = torch.from_numpy(np.expand_dims(x_, 0)).long()
batch_h = torch.from_numpy(np.expand_dims(h_, 0)).float()
gen1 = net.fast_generate(batch_x, batch_h, length, 1, "argmax")
gen1_list += [gen1]
# batch generation
batch_x = torch.from_numpy(x).long()
batch_h = torch.from_numpy(h).float()
gen2_list = net.batch_fast_generate(batch_x, batch_h, length_list, 1,
"argmax")
# assertion
for gen1, gen2 in zip(gen1_list, gen2_list):
np.testing.assert_array_equal(gen1, gen2)
def main():
"""RUN TRAINING."""
parser = argparse.ArgumentParser()
# path setting
parser.add_argument("--waveforms", required=True,
type=str, help="directory or list of wav files")
parser.add_argument("--feats", required=True,
type=str, help="directory or list of aux feat files")
parser.add_argument("--stats", required=True,
type=str, help="hdf5 file including statistics")
parser.add_argument("--expdir", required=True,
type=str, help="directory to save the model")
parser.add_argument("--feature_type", default="world", choices=["world", "melspc"],
type=str, help="feature type")
# network structure setting
parser.add_argument("--n_quantize", default=256,
type=int, help="number of quantization")
parser.add_argument("--n_aux", default=28,
type=int, help="number of dimension of aux feats")
parser.add_argument("--n_resch", default=512,
type=int, help="number of channels of residual output")
parser.add_argument("--n_skipch", default=256,
type=int, help="number of channels of skip output")
parser.add_argument("--dilation_depth", default=10,
type=int, help="depth of dilation")
parser.add_argument("--dilation_repeat", default=1,
type=int, help="number of repeating of dilation")
parser.add_argument("--kernel_size", default=2,
type=int, help="kernel size of dilated causal convolution")
parser.add_argument("--upsampling_factor", default=80,
type=int, help="upsampling factor of aux features")
parser.add_argument("--use_upsampling_layer", default=True,
type=strtobool, help="flag to use upsampling layer")
parser.add_argument("--use_speaker_code", default=False,
type=strtobool, help="flag to use speaker code")
# network training setting
parser.add_argument("--lr", default=1e-4,
type=float, help="learning rate")
parser.add_argument("--weight_decay", default=0.0,
type=float, help="weight decay coefficient")
parser.add_argument("--batch_length", default=20000,
type=int, help="batch length (if set 0, utterance batch will be used)")
parser.add_argument("--batch_size", default=1,
type=int, help="batch size (if use utterance batch, batch_size will be 1.")
parser.add_argument("--iters", default=200000,
type=int, help="number of iterations")
# other setting
parser.add_argument("--checkpoint_interval", default=10000,
type=int, help="how frequent saving model")
parser.add_argument("--intervals", default=100,
type=int, help="log interval")
parser.add_argument("--seed", default=1,
type=int, help="seed number")
parser.add_argument("--resume", default=None, nargs="?",
type=str, help="model path to restart training")
parser.add_argument("--n_gpus", default=1,
type=int, help="number of gpus")
parser.add_argument("--verbose", default=1,
type=int, help="log level")
args = parser.parse_args()
# set log level
if args.verbose == 1:
logging.basicConfig(level=logging.INFO,
format='%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s',
datefmt='%m/%d/%Y %I:%M:%S')
elif args.verbose > 1:
logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s',
datefmt='%m/%d/%Y %I:%M:%S')
else:
logging.basicConfig(level=logging.WARNING,
format='%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s',
datefmt='%m/%d/%Y %I:%M:%S')
logging.warning("logging is disabled.")
# show arguments
for key, value in vars(args).items():
logging.info("%s = %s" % (key, str(value)))
# make experimental directory
if not os.path.exists(args.expdir):
os.makedirs(args.expdir)
# fix seed
os.environ['PYTHONHASHSEED'] = str(args.seed)
np.random.seed(args.seed)
torch.manual_seed(args.seed)
# fix slow computation of dilated conv
# https://github.com/pytorch/pytorch/issues/15054#issuecomment-450191923
torch.backends.cudnn.benchmark = True
# save args as conf
torch.save(args, args.expdir + "/model.conf")
# define network
if args.use_upsampling_layer:
upsampling_factor = args.upsampling_factor
else:
upsampling_factor = 0
model = WaveNet(
n_quantize=args.n_quantize,
n_aux=args.n_aux,
n_resch=args.n_resch,
n_skipch=args.n_skipch,
dilation_depth=args.dilation_depth,
dilation_repeat=args.dilation_repeat,
kernel_size=args.kernel_size,
upsampling_factor=upsampling_factor)
logging.info(model)
model.apply(initialize)
model.train()
if args.n_gpus > 1:
device_ids = range(args.n_gpus)
model = torch.nn.DataParallel(model, device_ids)
model.receptive_field = model.module.receptive_field
if args.n_gpus > args.batch_size:
logging.warning("batch size is less than number of gpus.")
# define optimizer and loss
optimizer = torch.optim.Adam(
model.parameters(),
lr=args.lr,
weight_decay=args.weight_decay)
criterion = nn.CrossEntropyLoss()
# define transforms
scaler = StandardScaler()
scaler.mean_ = read_hdf5(args.stats, "/" + args.feature_type + "/mean")
scaler.scale_ = read_hdf5(args.stats, "/" + args.feature_type + "/scale")
wav_transform = transforms.Compose([
lambda x: encode_mu_law(x, args.n_quantize)])
feat_transform = transforms.Compose([
lambda x: scaler.transform(x)])
# define generator
if os.path.isdir(args.waveforms):
filenames = sorted(find_files(args.waveforms, "*.wav", use_dir_name=False))
wav_list = [args.waveforms + "/" + filename for filename in filenames]
feat_list = [args.feats + "/" + filename.replace(".wav", ".h5") for filename in filenames]
elif os.path.isfile(args.waveforms):
wav_list = read_txt(args.waveforms)
feat_list = read_txt(args.feats)
else:
logging.error("--waveforms should be directory or list.")
sys.exit(1)
assert len(wav_list) == len(feat_list)
logging.info("number of training data = %d." % len(wav_list))
generator = train_generator(
wav_list, feat_list,
receptive_field=model.receptive_field,
batch_length=args.batch_length,
batch_size=args.batch_size,
feature_type=args.feature_type,
wav_transform=wav_transform,
feat_transform=feat_transform,
shuffle=True,
upsampling_factor=args.upsampling_factor,
use_upsampling_layer=args.use_upsampling_layer,
use_speaker_code=args.use_speaker_code)
# charge minibatch in queue
while not generator.queue.full():
time.sleep(0.1)
# resume model and optimizer
if args.resume is not None and len(args.resume) != 0:
checkpoint = torch.load(args.resume, map_location=lambda storage, loc: storage)
iterations = checkpoint["iterations"]
if args.n_gpus > 1:
model.module.load_state_dict(checkpoint["model"])
else:
model.load_state_dict(checkpoint["model"])
optimizer.load_state_dict(checkpoint["optimizer"])
logging.info("restored from %d-iter checkpoint." % iterations)
else:
iterations = 0
# check gpu and then send to gpu
if torch.cuda.is_available():
model.cuda()
criterion.cuda()
for state in optimizer.state.values():
for key, value in state.items():
if torch.is_tensor(value):
state[key] = value.cuda()
else:
logging.error("gpu is not available. please check the setting.")
sys.exit(1)
# train
loss = 0
total = 0
for i in six.moves.range(iterations, args.iters):
start = time.time()
(batch_x, batch_h), batch_t = generator.next()
batch_output = model(batch_x, batch_h)
batch_loss = criterion(
batch_output[:, model.receptive_field:].contiguous().view(-1, args.n_quantize),
batch_t[:, model.receptive_field:].contiguous().view(-1))
optimizer.zero_grad()
batch_loss.backward()
optimizer.step()
loss += batch_loss.item()
total += time.time() - start
logging.debug("batch loss = %.3f (%.3f sec / batch)" % (
batch_loss.item(), time.time() - start))
# report progress
if (i + 1) % args.intervals == 0:
logging.info("(iter:%d) average loss = %.6f (%.3f sec / batch)" % (
i + 1, loss / args.intervals, total / args.intervals))
logging.info("estimated required time = "
"{0.days:02}:{0.hours:02}:{0.minutes:02}:{0.seconds:02}"
.format(relativedelta(
seconds=int((args.iters - (i + 1)) * (total / args.intervals)))))
loss = 0
total = 0
# save intermidiate model
if (i + 1) % args.checkpoint_interval == 0:
if args.n_gpus > 1:
save_checkpoint(args.expdir, model.module, optimizer, i + 1)
else:
save_checkpoint(args.expdir, model, optimizer, i + 1)
# save final model
if args.n_gpus > 1:
torch.save({"model": model.module.state_dict()}, args.expdir + "/checkpoint-final.pkl")
else:
torch.save({"model": model.state_dict()}, args.expdir + "/checkpoint-final.pkl")
logging.info("final checkpoint created.")
def main():
"""RUN DECODING."""
parser = argparse.ArgumentParser()
# decode setting
parser.add_argument("--seed_waveforms",
required=True,
type=str,
help="directory or list of wav files")
parser.add_argument("--checkpoint",
required=True,
type=str,
help="model file")
parser.add_argument("--outdir",
required=True,
type=str,
help="directory to save generated samples")
parser.add_argument("--config",
default=None,
type=str,
help="configure file")
parser.add_argument("--fs", default=16000, type=int, help="sampling rate")
parser.add_argument("--batch_size",
default=1,
type=int,
help="number of batches to decode of batch_length")
parser.add_argument("--speaker_code", type=int, help="speaker code")
# other setting
parser.add_argument("--intervals",
default=1000,
type=int,
help="log interval")
parser.add_argument("--seed", default=1, type=int, help="seed number")
parser.add_argument("--verbose", default=1, type=int, help="log level")
args = parser.parse_args()
# set log level
if args.verbose > 0:
logging.basicConfig(
level=logging.INFO,
format=
'%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s',
datefmt='%m/%d/%Y %I:%M:%S')
elif args.verbose > 1:
logging.basicConfig(
level=logging.DEBUG,
format=
'%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s',
datefmt='%m/%d/%Y %I:%M:%S')
else:
logging.basicConfig(
level=logging.WARNING,
format=
'%(asctime)s (%(module)s:%(lineno)d) %(levelname)s: %(message)s',
datefmt='%m/%d/%Y %I:%M:%S')
logging.warning("logging is disabled.")
# show arguments
for key, value in vars(args).items():
logging.info("%s = %s" % (key, str(value)))
# check arguments
if args.config is None:
args.config = os.path.dirname(args.checkpoint) + "/model.conf"
if not os.path.exists(args.config):
raise FileNotFoundError("config file is missing (%s)." % (args.config))
# check directory existence
if not os.path.exists(args.outdir):
os.makedirs(args.outdir)
if os.path.isdir(args.seed_waveforms):
filenames = sorted(
find_files(args.seed_waveforms, "*.wav", use_dir_name=False))
wav_list = [
args.seed_waveforms + "/" + filename for filename in filenames
]
elif os.path.isfile(args.seed_waveforms):
wav_list = read_txt(args.seed_waveforms)
else:
logging.error("--seed_waveforms should be directory or list.")
sys.exit(1)
# if speaker code is specified then filter out all other speakers if files conform to wave set pattern
if not args.speaker_code is None:
try:
wav_list = [
file for file in wav_list
if parse_wave_file_name(file)[1] == args.speaker_code
]
except ValueError:
# files not in wave set format, then original list will be kept
pass
# fix seed
os.environ['PYTHONHASHSEED'] = str(args.seed)
np.random.seed(args.seed)
torch.manual_seed(args.seed)
# fix slow computation of dilated conv
# https://github.com/pytorch/pytorch/issues/15054#issuecomment-450191923
torch.backends.cudnn.benchmark = True
# load config
config = torch.load(args.config)
wav_transform = transforms.Compose(
[lambda x: encode_mu_law(x, config.n_quantize)])
# set default gpu and do not track gradient
torch.set_grad_enabled(False)
# define model and load parameters
model = WaveNet(n_quantize=config.n_quantize,
n_aux=1,
n_resch=config.n_resch,
n_skipch=config.n_skipch,
dilation_depth=config.dilation_depth,
dilation_repeat=config.dilation_repeat,
kernel_size=config.kernel_size)
checkpoint = torch.load(args.checkpoint,
map_location=lambda storage, loc: storage)
model.load_state_dict(checkpoint["model"])
model.eval()
if torch.cuda.is_available():
model.cuda()
# extract train iterations
train_iterations = checkpoint["iterations"]
# choose seed sample
wav_id = np.random.randint(0, high=len(wav_list))
wav_file = wav_list[wav_id]
seed_x, _rate = sf.read(wav_file, dtype=np.float32)
assert args.fs == _rate, f"expected sample rate is {args.fs}, {wav_file} is {_rate}"
tot_sample_length = config.batch_length + model.receptive_field
max_sample_id = seed_x.shape[0] - tot_sample_length
assert max_sample_id >= 0
sample_id = np.random.randint(0, max_sample_id)
seed_sample = seed_x[sample_id:sample_id + tot_sample_length]
# take code from filename if none
speaker_code = parse_wave_file_name(
wav_file)[1] if args.speaker_code is None else args.speaker_code
# log decoding info
output_fn_info = f"I{train_iterations}-R{args.seed}-S{speaker_code}-W{Path(wav_file).stem}"
length_sec = args.batch_size * config.batch_length / args.fs
logging.info(
f"generating {args.batch_size} batches of {config.batch_length} samples = {length_sec} seconds"
f" into {output_fn_info} set")
# write seed sample
sf.write(args.outdir + f"/seed_sample-{output_fn_info}.wav", seed_sample,
args.fs, "PCM_16")
logging.info("wrote seed_sample.wav in %s." % args.outdir)
# decode
new_samples = args.batch_size * config.batch_length
x, h = decode_from_wav(seed_sample,
new_samples,
wav_transform=wav_transform,
speaker_code=speaker_code)
def save_samples(samples, file_name):
wav_data = decode_mu_law(samples, config.n_quantize)
sf.write(file_name, wav_data, args.fs, "PCM_16")
def progress_callback(samples, no_samples, elapsed):
save_samples(samples,
args.outdir + "/" + f"decoded.t.all-{output_fn_info}.wav")
save_samples(samples[-no_samples:],
args.outdir + "/" + f"decoded.t.new-{output_fn_info}.wav")
logging.info("decoding (length = %d)" % h.shape[2])
samples = model.fast_generate(x,
h,
new_samples,
args.intervals,
callback=progress_callback)
# samples = model.generate(x, h, new_samples, args.intervals)
logging.info(f"decoded {len(seed_sample)}")
save_samples(samples, args.outdir + "/" + f"decoded-{output_fn_info}.wav")
logging.info("wrote decoded.wav in %s." % args.outdir)
def test_assert_fast_generation():
# get batch
batch = 2
x = np.random.randint(0, 256, size=(batch, 1))
h = np.random.randn(batch, 28, 32)
length = h.shape[-1] - 1
with torch.no_grad():
# --------------------------------------------------------
# define model without upsampling and with kernel size = 2
# --------------------------------------------------------
net = WaveNet(256, 28, 4, 4, 10, 3, 2)
net.apply(initialize)
net.eval()
# sample-by-sample generation
gen1_list = []
gen2_list = []
for x_, h_ in zip(x, h):
batch_x = torch.from_numpy(np.expand_dims(x_, 0)).long()
batch_h = torch.from_numpy(np.expand_dims(h_, 0)).float()
gen1 = net.generate(batch_x, batch_h, length, 1, "argmax")
gen2 = net.fast_generate(batch_x, batch_h, length, 1, "argmax")
np.testing.assert_array_equal(gen1, gen2)
gen1_list += [gen1]
gen2_list += [gen2]
gen1 = np.stack(gen1_list)
gen2 = np.stack(gen2_list)
np.testing.assert_array_equal(gen1, gen2)
# batch generation
batch_x = torch.from_numpy(x).long()
batch_h = torch.from_numpy(h).float()
gen3_list = net.batch_fast_generate(batch_x, batch_h, [length] * batch,
1, "argmax")
gen3 = np.stack(gen3_list)
np.testing.assert_array_equal(gen3, gen2)
# --------------------------------------------------------
# define model without upsampling and with kernel size = 3
# --------------------------------------------------------
net = WaveNet(256, 28, 4, 4, 10, 3, 3)
net.apply(initialize)
net.eval()
# sample-by-sample generation
gen1_list = []
gen2_list = []
for x_, h_ in zip(x, h):
batch_x = torch.from_numpy(np.expand_dims(x_, 0)).long()
batch_h = torch.from_numpy(np.expand_dims(h_, 0)).float()
gen1 = net.generate(batch_x, batch_h, length, 1, "argmax")
gen2 = net.fast_generate(batch_x, batch_h, length, 1, "argmax")
np.testing.assert_array_equal(gen1, gen2)
gen1_list += [gen1]
gen2_list += [gen2]
gen1 = np.stack(gen1_list)
gen2 = np.stack(gen2_list)
np.testing.assert_array_equal(gen1, gen2)
# batch generation
batch_x = torch.from_numpy(x).long()
batch_h = torch.from_numpy(h).float()
gen3_list = net.batch_fast_generate(batch_x, batch_h, [length] * batch,
1, "argmax")
gen3 = np.stack(gen3_list)
np.testing.assert_array_equal(gen3, gen2)
# get batch
batch = 2
upsampling_factor = 10
x = np.random.randint(0, 256, size=(batch, 1))
h = np.random.randn(batch, 28, 3)
length = h.shape[-1] * upsampling_factor - 1
# -----------------------------------------------------
# define model with upsampling and with kernel size = 2
# -----------------------------------------------------
net = WaveNet(256, 28, 4, 4, 10, 3, 2, upsampling_factor)
net.apply(initialize)
net.eval()
# sample-by-sample generation
gen1_list = []
gen2_list = []
for x_, h_ in zip(x, h):
batch_x = torch.from_numpy(np.expand_dims(x_, 0)).long()
batch_h = torch.from_numpy(np.expand_dims(h_, 0)).float()
gen1 = net.generate(batch_x, batch_h, length, 1, "argmax")
gen2 = net.fast_generate(batch_x, batch_h, length, 1, "argmax")
np.testing.assert_array_equal(gen1, gen2)
gen1_list += [gen1]
gen2_list += [gen2]
gen1 = np.stack(gen1_list)
gen2 = np.stack(gen2_list)
np.testing.assert_array_equal(gen1, gen2)
# batch generation
batch_x = torch.from_numpy(x).long()
batch_h = torch.from_numpy(h).float()
gen3_list = net.batch_fast_generate(batch_x, batch_h, [length] * batch,
1, "argmax")
gen3 = np.stack(gen3_list)
np.testing.assert_array_equal(gen3, gen2)
# -----------------------------------------------------
# define model with upsampling and with kernel size = 3
# -----------------------------------------------------
net = WaveNet(256, 28, 4, 4, 10, 3, 2, upsampling_factor)
net.apply(initialize)
net.eval()
# sample-by-sample generation
gen1_list = []
gen2_list = []
for x_, h_ in zip(x, h):
batch_x = torch.from_numpy(np.expand_dims(x_, 0)).long()
batch_h = torch.from_numpy(np.expand_dims(h_, 0)).float()
gen1 = net.generate(batch_x, batch_h, length, 1, "argmax")
gen2 = net.fast_generate(batch_x, batch_h, length, 1, "argmax")
np.testing.assert_array_equal(gen1, gen2)
gen1_list += [gen1]
gen2_list += [gen2]
gen1 = np.stack(gen1_list)
gen2 = np.stack(gen2_list)
np.testing.assert_array_equal(gen1, gen2)
# batch generation
batch_x = torch.from_numpy(x).long()
batch_h = torch.from_numpy(h).float()
gen3_list = net.batch_fast_generate(batch_x, batch_h, [length] * batch,
1, "argmax")
gen3 = np.stack(gen3_list)
np.testing.assert_array_equal(gen3, gen2)
def test_generate():
batch = 2
x = np.random.randint(0, 256, size=(batch, 1))
h = np.random.randn(batch, 28, 10)
length = h.shape[-1] - 1
with torch.no_grad():
net = WaveNet(256, 28, 4, 4, 10, 3, 2)
net.apply(initialize)
net.eval()
for x_, h_ in zip(x, h):
batch_x = torch.from_numpy(np.expand_dims(x_, 0)).long()
batch_h = torch.from_numpy(np.expand_dims(h_, 0)).float()
net.generate(batch_x, batch_h, length, 1, "sampling")
net.fast_generate(batch_x, batch_h, length, 1, "sampling")
batch_x = torch.from_numpy(x).long()
batch_h = torch.from_numpy(h).float()
net.batch_fast_generate(batch_x, batch_h, [length] * batch, 1,
"sampling")
def test_forward():
# get batch
generator = sine_generator(100)
batch = next(generator)
batch_input = batch.view(1, -1)
batch_aux = torch.rand(1, 28, batch_input.size(1)).float()
# define model without upsampling with kernel size = 2
net = WaveNet(256, 28, 32, 128, 10, 1, 2)
net.apply(initialize)
net.eval()
y = net(batch_input, batch_aux)[0]
assert y.size(0) == batch_input.size(1)
assert y.size(1) == 256
# define model without upsampling with kernel size = 3
net = WaveNet(256, 28, 32, 128, 10, 1, 2)
net.apply(initialize)
net.eval()
y = net(batch_input, batch_aux)[0]
assert y.size(0) == batch_input.size(1)
assert y.size(1) == 256
batch_input = batch.view(1, -1)
batch_aux = torch.rand(1, 28, batch_input.size(1) // 10).float()
# define model with upsampling and kernel size = 2
net = WaveNet(256, 28, 32, 128, 10, 1, 2, 10)
net.apply(initialize)
net.eval()
y = net(batch_input, batch_aux)[0]
assert y.size(0) == batch_input.size(1)
assert y.size(1) == 256
# define model with upsampling and kernel size = 3
net = WaveNet(256, 28, 32, 128, 10, 1, 3, 10)
net.apply(initialize)
net.eval()
y = net(batch_input, batch_aux)[0]
assert y.size(0) == batch_input.size(1)
assert y.size(1) == 256
