def test_stft_windows(fb_config):
kernel_size = fb_config["kernel_size"]
win = np.hanning(kernel_size)
STFTFB(**fb_config, window=win)
with pytest.raises(AssertionError):
win = np.hanning(kernel_size + 1)
STFTFB(**fb_config, window=win)
def test_griffinlim(fb_config, feed_istft, feed_angle):
stft = Encoder(STFTFB(**fb_config))
istft = None if not feed_istft else Decoder(STFTFB(**fb_config))
wav = torch.randn(2, 1, 8000)
spec = stft(wav)
tf_mask = torch.sigmoid(torch.randn_like(spec))
masked_spec = spec * tf_mask
mag = transforms.mag(masked_spec, -2)
angles = None if not feed_angle else transforms.angle(masked_spec, -2)
griffin_lim(mag, stft, angles=angles, istft_dec=istft, n_iter=3)
def test_pmsqe_pit(n_src, sample_rate):
# Define supported STFT
if sample_rate == 16000:
stft = Encoder(STFTFB(kernel_size=512, n_filters=512, stride=256))
else:
stft = Encoder(STFTFB(kernel_size=256, n_filters=256, stride=128))
# Usage by itself
ref, est = torch.randn(2, n_src, 16000), torch.randn(2, n_src, 16000)
ref_spec = transforms.mag(stft(ref))
est_spec = transforms.mag(stft(est))
loss_func = PITLossWrapper(SingleSrcPMSQE(sample_rate=sample_rate),
pit_from="pw_pt")
# Assert forward ok.
loss_func(est_spec, ref_spec)
def test_perfect_resyn_window(fb_config, analysis_window_name,
use_torch_window):
""" Unit test perfect reconstruction """
kernel_size = fb_config["kernel_size"]
window = get_window(analysis_window_name, kernel_size)
if use_torch_window:
window = torch.Tensor(window)
enc = Encoder(STFTFB(**fb_config, window=window))
# Compute window for perfect resynthesis
synthesis_window = perfect_synthesis_window(enc.filterbank.window,
enc.stride)
dec = Decoder(STFTFB(**fb_config, window=synthesis_window))
inp_wav = torch.ones(1, 1, 32000)
out_wav = dec(enc(inp_wav))[:, :, kernel_size:-kernel_size]
inp_test = inp_wav[:, :, kernel_size:-kernel_size]
testing.assert_allclose(inp_test, out_wav)
def test_pmsqe(sample_rate):
# Define supported STFT
if sample_rate == 16000:
stft = Encoder(STFTFB(kernel_size=512, n_filters=512, stride=256))
else:
stft = Encoder(STFTFB(kernel_size=256, n_filters=256, stride=128))
# Usage by itself
ref, est = torch.randn(2, 1, 16000), torch.randn(2, 1, 16000)
ref_spec = transforms.mag(stft(ref))
est_spec = transforms.mag(stft(est))
loss_func = SingleSrcPMSQE(sample_rate=sample_rate)
loss_value = loss_func(est_spec, ref_spec)
# Assert output has shape (batch,)
assert loss_value.shape[0] == ref.shape[0]
# Assert support for transposed inputs.
tr_loss_value = loss_func(est_spec.transpose(1, 2),
ref_spec.transpose(1, 2))
assert_allclose(loss_value, tr_loss_value)
def test_misi(fb_config, feed_istft, feed_angle):
stft = Encoder(STFTFB(**fb_config))
istft = None if not feed_istft else Decoder(STFTFB(**fb_config))
n_src = 3
# Create mixture
wav = torch.randn(2, 1, 8000)
spec = stft(wav).unsqueeze(1)
# Create n_src masks on mixture spec and apply them
shape = list(spec.shape)
shape[1] *= n_src
tf_mask = torch.sigmoid(torch.randn(*shape))
masked_specs = spec * tf_mask
# Separate mag and angle.
mag = transforms.mag(masked_specs, -2)
angles = None if not feed_angle else transforms.angle(masked_specs, -2)
est_wavs = misi(wav, mag, stft, angles=angles, istft_dec=istft, n_iter=2)
# We actually don't know the last dim because ISTFT(STFT()) cuts the end
assert est_wavs.shape[:-1] == (2, n_src)
def test_stft_def(fb_config):
""" Check consistency between two calls."""
fb = STFTFB(**fb_config)
enc = Encoder(fb)
dec = Decoder(fb)
enc2, dec2 = make_enc_dec("stft", **fb_config)
testing.assert_allclose(enc.filterbank.filters(),
enc2.filterbank.filters())
testing.assert_allclose(dec.filterbank.filters(),
dec2.filterbank.filters())
def test_pcen_forward(n_channels, batch_size):
audio = torch.randn(batch_size, n_channels, 16000 * 10)
fb = STFTFB(kernel_size=256, n_filters=256, stride=128)
enc = Encoder(fb)
tf_rep = enc(audio)
mag_spec = transforms.mag(tf_rep)
pcen = PCEN(n_channels=n_channels)
energy = pcen(mag_spec)
expected_shape = mag_spec.shape
assert energy.shape == expected_shape
def __init__(self,
n_filters=None,
windows_size=None,
hops_size=None,
alpha=1.0):
super().__init__()
if windows_size is None:
windows_size = [2048, 1024, 512, 256, 128, 64, 32]
if n_filters is None:
n_filters = [2048, 1024, 512, 256, 128, 64, 32]
if hops_size is None:
hops_size = [1024, 512, 256, 128, 64, 32, 16]
self.windows_size = windows_size
self.n_filters = n_filters
self.hops_size = hops_size
self.alpha = alpha
self.encoders = nn.ModuleList(
Encoder(STFTFB(n_filters[i], windows_size[i], hops_size[i]))
for i in range(len(self.n_filters)))
def test_filter_shape(fb_config):
# Instantiate STFT
fb = STFTFB(**fb_config)
# Check filter shape.
assert fb.filters().shape == (fb_config["n_filters"] + 2, 1,
fb_config["kernel_size"])
def test_stft_def_error(n_filters):
with pytest.raises(ValueError) as err:
STFTFB(n_filters, n_filters)
assert str(err.value) == f"n_filters must be even, got {n_filters}"