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import chainer
from .config import ModelConfig
class Convolution1D(chainer.links.ConvolutionND):
def __init__(self, in_channels, out_channels, ksize, stride=1, pad=0,
nobias=False, initialW=None, initial_bias=None,
cover_all=False):
super(Convolution1D, self).__init__(
ndim=1,
in_channels=in_channels,
out_channels=out_channels,
ksize=ksize,
stride=stride,
pad=pad,
nobias=nobias,
initialW=initialW,
initial_bias=initial_bias,
cover_all=cover_all,
)
class ConvHighway(chainer.link.Chain):
def __init__(self, in_out_size, nobias=False, activate=chainer.functions.relu,
init_Wh=None, init_Wt=None, init_bh=None, init_bt=-1):
super().__init__()
self.activate = activate
with self.init_scope():
self.plain = Convolution1D(
in_out_size, in_out_size, 1, nobias=nobias,
initialW=init_Wh, initial_bias=init_bh)
self.transform = Convolution1D(
in_out_size, in_out_size, 1, nobias=nobias,
initialW=init_Wt, initial_bias=init_bt)
def __call__(self, x):
out_plain = self.activate(self.plain(x))
out_transform = chainer.functions.sigmoid(self.transform(x))
y = out_plain * out_transform + x * (1 - out_transform)
return y
class PreNet(chainer.link.Chain):
def __init__(self, in_channels: int, hidden_channels: int, out_channels: int):
super().__init__()
with self.init_scope():
self.conv1 = Convolution1D(in_channels, hidden_channels, 1)
self.conv2 = Convolution1D(hidden_channels, out_channels, 1)
def __call__(self, x):
h = x
h = chainer.functions.dropout((chainer.functions.relu(self.conv1(h)), 0.5))
h = chainer.functions.dropout((chainer.functions.relu(self.conv2(h)), 0.5))
return h
class Conv1DBank(chainer.link.Chain):
def __init__(self, in_channels: int, out_channels: int, k: int):
super().__init__()
self.stacked_channels = out_channels * k
self.pads = [
chainer.functions.Pad(((0, 0), (0, 0), (i // 2, (i + 1) // 2)), mode='constant')
for i in range(k)
]
with self.init_scope():
self.convs = chainer.link.ChainList(
*(Convolution1D(in_channels, out_channels, i + 1, nobias=True) for i in range(k))
)
self.bn = chainer.links.BatchNormalization(out_channels * k)
def __call__(self, x):
h = x
h = chainer.functions.concat([conv(pad(h)) for pad, conv in zip(self.pads, self.convs)])
h = chainer.functions.relu(self.bn(h))
return h
class Conv1DProjections(chainer.link.Chain):
def __init__(self, in_channels: int, hidden_channels: int, out_channels: int):
super().__init__()
with self.init_scope():
self.conv1 = Convolution1D(in_channels, hidden_channels, 3, pad=1, nobias=True)
self.bn1 = chainer.links.BatchNormalization(hidden_channels)
self.conv2 = Convolution1D(hidden_channels, out_channels, 3, pad=1, nobias=True)
self.bn2 = chainer.links.BatchNormalization(out_channels)
def __call__(self, x):
h = x
h = chainer.functions.relu(self.bn1(self.conv1(h)))
h = chainer.functions.relu(self.bn2(self.conv2(h)))
return h
class CBHG(chainer.link.Chain):
def __init__(
self,
in_channels: int,
conv_bank_out_channels: int,
conv_bank_k: int,
max_pooling_k: int,
conv_projections_hidden_channels: int,
highway_layers: int,
out_channels: int,
):
super().__init__()
self.max_pooling_padding = chainer.functions.Pad(
((0, 0), (0, 0), ((max_pooling_k - 1) // 2, max_pooling_k // 2)),
mode='constant',
)
self.max_pooling = chainer.functions.MaxPoolingND(1, max_pooling_k, 1, cover_all=False)
self.out_size = out_channels * 2
with self.init_scope():
self.conv_bank = Conv1DBank(
in_channels=in_channels,
out_channels=conv_bank_out_channels,
k=conv_bank_k,
)
self.conv_projectoins = Conv1DProjections(
in_channels=self.conv_bank.stacked_channels,
hidden_channels=conv_projections_hidden_channels,
out_channels=out_channels,
)
self.highways = chainer.link.ChainList(
*([ConvHighway(out_channels) for _ in range(highway_layers)])
)
self.gru = chainer.links.NStepBiGRU(
n_layers=1,
in_size=out_channels,
out_size=out_channels,
dropout=0.0,
)
def __call__(self, x):
h = x
h = self.conv_bank(h)
h = self.max_pooling(self.max_pooling_padding(h))
h = self.conv_projectoins(h)
h = h + x
for highway in self.highways:
h = highway(h)
h = chainer.functions.separate(chainer.functions.transpose(h, axes=(0, 2, 1)))
_, h = self.gru(None, h)
h = chainer.functions.transpose(chainer.functions.stack(h), axes=(0, 2, 1))
return h
class Model(chainer.link.Chain):
def __init__(self, network, out_size: int):
super().__init__()
with self.init_scope():
self.network = network
self.last = Convolution1D(network.out_size, out_size, 1)
def __call__(self, x):
h = x
h = self.network(h)
h = self.last(h)
return h
def create(config: ModelConfig):
network = CBHG(
in_channels=config.in_channels,
conv_bank_out_channels=config.conv_bank_out_channels,
conv_bank_k=config.conv_bank_k,
max_pooling_k=config.max_pooling_k,
conv_projections_hidden_channels=config.conv_projections_hidden_channels,
highway_layers=config.highway_layers,
out_channels=config.out_channels,
)
model = Model(
network=network,
out_size=config.out_size,
)
return model
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