class JointAutoregressiveHierarchicalPriors(CompressionModel):
r"""Joint Autoregressive Hierarchical Priors model from D.
Minnen, J. Balle, G.D. Toderici: `"Joint Autoregressive and Hierarchical
Priors for Learned Image Compression" <https://arxiv.org/abs/1809.02736>`_,
Adv. in Neural Information Processing Systems 31 (NeurIPS 2018).
Args:
N (int): Number of channels
M (int): Number of channels in the expansion layers (last layer of the
encoder and last layer of the hyperprior decoder)
"""
def __init__(self, N=192, M=192, **kwargs):
super().__init__(entropy_bottleneck_channels=N, **kwargs)
self.g_a = nn.Sequential(
conv(3, N, kernel_size=5, stride=2),
GDN(N),
conv(N, N, kernel_size=5, stride=2),
GDN(N),
conv(N, N, kernel_size=5, stride=2),
GDN(N),
conv(N, M, kernel_size=5, stride=2),
)
self.g_s = nn.Sequential(
deconv(M, N, kernel_size=5, stride=2),
GDN(N, inverse=True),
deconv(N, N, kernel_size=5, stride=2),
GDN(N, inverse=True),
deconv(N, N, kernel_size=5, stride=2),
GDN(N, inverse=True),
deconv(N, 3, kernel_size=5, stride=2),
)
self.h_a = nn.Sequential(
conv(M, N, stride=1, kernel_size=3),
nn.LeakyReLU(inplace=True),
conv(N, N, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
conv(N, N, stride=2, kernel_size=5),
)
self.h_s = nn.Sequential(
deconv(N, M, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
deconv(M, M * 3 // 2, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
conv(M * 3 // 2, M * 2, stride=1, kernel_size=3),
)
self.entropy_parameters = nn.Sequential(
nn.Conv2d(M * 12 // 3, M * 10 // 3, 1),
nn.LeakyReLU(inplace=True),
nn.Conv2d(M * 10 // 3, M * 8 // 3, 1),
nn.LeakyReLU(inplace=True),
nn.Conv2d(M * 8 // 3, M * 6 // 3, 1),
)
self.context_prediction = MaskedConv2d(M,
2 * M,
kernel_size=5,
padding=2,
stride=1)
self.gaussian_conditional = GaussianConditional(None)
self.N = int(N)
self.M = int(M)
def forward(self, x):
y = self.g_a(x)
z = self.h_a(y)
z_hat, z_likelihoods = self.entropy_bottleneck(z)
params = self.h_s(z_hat)
y_hat = self.gaussian_conditional._quantize( # pylint: disable=protected-access
y, 'noise' if self.training else 'dequantize')
ctx_params = self.context_prediction(y_hat)
gaussian_params = self.entropy_parameters(
torch.cat((params, ctx_params), dim=1))
scales_hat, means_hat = gaussian_params.chunk(2, 1)
_, y_likelihoods = self.gaussian_conditional(y,
scales_hat,
means=means_hat)
x_hat = self.g_s(y_hat)
return {
'x_hat': x_hat,
'likelihoods': {
'y': y_likelihoods,
'z': z_likelihoods
},
}
@classmethod
def from_state_dict(cls, state_dict):
"""Return a new model instance from `state_dict`."""
N = state_dict['g_a.0.weight'].size(0)
M = state_dict['g_a.6.weight'].size(0)
net = cls(N, M)
net.load_state_dict(state_dict)
return net
def compress(self, x):
y = self.g_a(x)
z = self.h_a(y)
z_strings = self.entropy_bottleneck.compress(z)
z_hat = self.entropy_bottleneck.decompress(z_strings, z.size()[-2:])
params = self.h_s(z_hat)
s = 4 # scaling factor between z and y
kernel_size = 5 # context prediction kernel size
padding = (kernel_size - 1) // 2
y_height = z_hat.size(2) * s
y_width = z_hat.size(3) * s
y_hat = F.pad(y, (padding, padding, padding, padding))
# yapf: enable
# pylint: disable=protected-access
cdf = self.gaussian_conditional._quantized_cdf.tolist()
cdf_lengths = self.gaussian_conditional._cdf_length.reshape(
-1).int().tolist()
offsets = self.gaussian_conditional._offset.reshape(-1).int().tolist()
# pylint: enable=protected-access
y_strings = []
for i in range(y.size(0)):
encoder = BufferedRansEncoder()
# Warning, this is slow...
# TODO: profile the calls to the bindings...
for h in range(y_height):
for w in range(y_width):
y_crop = y_hat[i:i + 1, :, h:h + kernel_size,
w:w + kernel_size]
ctx_params = self.context_prediction(y_crop)
# 1x1 conv for the entropy parameters prediction network, so
# we only keep the elements in the "center"
ctx_p = ctx_params[i:i + 1, :, padding:padding + 1,
padding:padding + 1]
p = params[i:i + 1, :, h:h + 1, w:w + 1]
gaussian_params = self.entropy_parameters(
torch.cat((p, ctx_p), dim=1))
scales_hat, means_hat = gaussian_params.chunk(2, 1)
indexes = self.gaussian_conditional.build_indexes(
scales_hat)
y_q = torch.round(y_crop - means_hat)
y_hat[i, :, h + padding,
w + padding] = (y_q + means_hat)[i, :, padding,
padding]
encoder.encode_with_indexes(
y_q[i, :, padding, padding].int().tolist(),
indexes[i, :].squeeze().int().tolist(), cdf,
cdf_lengths, offsets)
string = encoder.flush()
y_strings.append(string)
# yapf: disable
return {'strings': [y_strings, z_strings], 'shape': z.size()[-2:]}
def decompress(self, strings, shape):
assert isinstance(strings, list) and len(strings) == 2
# FIXME: we don't respect the default entropy coder and directly call the
# range ANS decoder
z_hat = self.entropy_bottleneck.decompress(strings[1], shape)
params = self.h_s(z_hat)
s = 4 # scaling factor between z and y
kernel_size = 5 # context prediction kernel size
padding = (kernel_size - 1) // 2
y_height = z_hat.size(2) * s
y_width = z_hat.size(3) * s
# initialize y_hat to zeros, and pad it so we can directly work with
# sub-tensors of size (N, C, kernel size, kernel_size)
# yapf: disable
y_hat = torch.zeros((z_hat.size(0), self.M, y_height + 2 * padding, y_width + 2 * padding),
device=z_hat.device)
decoder = RansDecoder()
# pylint: disable=protected-access
cdf = self.gaussian_conditional._quantized_cdf.tolist()
cdf_lengths = self.gaussian_conditional._cdf_length.reshape(-1).int().tolist()
offsets = self.gaussian_conditional._offset.reshape(-1).int().tolist()
# Warning: this is slow due to the auto-regressive nature of the
# decoding... See more recent publication where they use an
# auto-regressive module on chunks of channels for faster decoding...
for i, y_string in enumerate(strings[0]):
decoder.set_stream(y_string)
for h in range(y_height):
for w in range(y_width):
# only perform the 5x5 convolution on a cropped tensor
# centered in (h, w)
y_crop = y_hat[i:i + 1, :, h:h + kernel_size, w:w + kernel_size]
# ctx_params = self.context_prediction(torch.round(y_crop))
ctx_params = self.context_prediction(y_crop)
# 1x1 conv for the entropy parameters prediction network, so
# we only keep the elements in the "center"
ctx_p = ctx_params[i:i + 1, :, padding:padding + 1, padding:padding + 1]
p = params[i:i + 1, :, h:h + 1, w:w + 1]
gaussian_params = self.entropy_parameters(torch.cat((p, ctx_p), dim=1))
scales_hat, means_hat = gaussian_params.chunk(2, 1)
indexes = self.gaussian_conditional.build_indexes(scales_hat)
rv = decoder.decode_stream(
indexes[i, :].squeeze().int().tolist(),
cdf,
cdf_lengths,
offsets)
rv = torch.Tensor(rv).reshape(1, -1, 1, 1)
rv = self.gaussian_conditional._dequantize(rv, means_hat)
y_hat[i, :, h + padding:h + padding + 1, w + padding:w + padding + 1] = rv
y_hat = y_hat[:, :, padding:-padding, padding:-padding]
# pylint: enable=protected-access
# yapf: enable
x_hat = self.g_s(y_hat).clamp_(0, 1)
return {'x_hat': x_hat}
def update(self, scale_table=None, force=False):
if scale_table is None:
scale_table = get_scale_table()
self.gaussian_conditional.update_scale_table(scale_table, force=force)
super().update(force=force)
def load_state_dict(self, state_dict):
# Dynamically update the entropy bottleneck buffers related to the CDFs
update_registered_buffers(self.entropy_bottleneck,
'entropy_bottleneck',
['_quantized_cdf', '_offset', '_cdf_length'],
state_dict)
update_registered_buffers(
self.gaussian_conditional, 'gaussian_conditional',
['_quantized_cdf', '_offset', '_cdf_length', 'scale_table'],
state_dict)
super().load_state_dict(state_dict)
class HSIC(CompressionModel):
def __init__(self,N=128,M=192,K=5,**kwargs): #'cuda:0' or 'cpu'
super().__init__(entropy_bottleneck_channels=N, **kwargs)
# super(DSIC, self).__init__()
# self.entropy_bottleneck1 = CompressionModel(entropy_bottleneck_channels=N)
# self.entropy_bottleneck2 = CompressionModel(entropy_bottleneck_channels=N)
self.gaussian1 = GaussianMixtureConditional(K = K)
self.gaussian2 = GaussianMixtureConditional(K = K)
self.N = int(N)
self.M = int(M)
self.K = int(K)
#定义组件
self.encoder1 = Encoder1(N,M)
self.encoder2 = Encoder2(N,M)
self.decoder1 = Decoder1(N,M)
self.decoder2 = Decoder2(N,M)
# pic2 需要的组件
# #hyper
# self._h_a1 = encode_hyper(N=N,M=M)
# self._h_a2 = encode_hyper(N=N,M=M)
# self._h_s1 = gmm_hyper_y1(N=N,M=M,K=K)
# self._h_s2 = gmm_hyper_y2(N=N,M=M,K=K)
######################################################################
self.h_a1 = nn.Sequential(
conv(M, N, stride=1, kernel_size=3),
nn.LeakyReLU(inplace=True),
conv(N, N, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
conv(N, N, stride=2, kernel_size=5),
)
self.h_s1 = nn.Sequential(
deconv(N, M, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
deconv(M, M * 3 // 2, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
conv(M * 3 // 2, M * 2, stride=1, kernel_size=3),
)
self.entropy_parameters1 = nn.Sequential(
nn.Conv2d(M * 12 // 3, M * 10 // 3, 1),
nn.LeakyReLU(inplace=True),
nn.Conv2d(M * 10 // 3, M * 8 // 3, 1),
nn.LeakyReLU(inplace=True),
nn.Conv2d(M * 8 // 3, M * 6 // 3, 1),
)
self.context_prediction1 = MaskedConv2d(M,
2 * M,
kernel_size=5,
padding=2,
stride=1)
self.gaussian_conditional1 = GaussianConditional(None)
self.h_a2 = nn.Sequential(
conv(M, N, stride=1, kernel_size=3),
nn.LeakyReLU(inplace=True),
conv(N, N, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
conv(N, N, stride=2, kernel_size=5),
)
self.h_s2 = nn.Sequential(
deconv(N, M, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
deconv(M, M * 3 // 2, stride=2, kernel_size=5),
nn.LeakyReLU(inplace=True),
conv(M * 3 // 2, M * 2, stride=1, kernel_size=3),
)
self.entropy_parameters2 = nn.Sequential(
nn.Conv2d(M * 18 // 3, M * 10 // 3, 1), # (M * 12 // 3, M * 10 // 3, 1),
nn.LeakyReLU(inplace=True),
nn.Conv2d(M * 10 // 3, M * 8 // 3, 1),
nn.LeakyReLU(inplace=True),
nn.Conv2d(M * 8 // 3, M * 6 // 3, 1),
)
self.context_prediction2 = MaskedConv2d(M,
2 * M,
kernel_size=5,
padding=2,
stride=1)
self.gaussian_conditional2 = GaussianConditional(None)
def forward(self,x1,x2,h_matrix):
#定义结构
y1,g1_1,g1_2,g1_3 = self.encoder1(x1)
z1 = self.h_a1(y1)
#print(z1.device)
z1_hat,z1_likelihoods = self.entropy_bottleneck1(z1)
#change:
params1 = self.h_s1(z1_hat)
y1_hat = self.gaussian_conditional1._quantize( # pylint: disable=protected-access
y1, 'noise' if self.training else 'dequantize')
ctx_params1 = self.context_prediction1(y1_hat) #用两次！！ 2M
gaussian_params1 = self.entropy_parameters1(
torch.cat((params1, ctx_params1), dim=1))
scales_hat1, means_hat1 = gaussian_params1.chunk(2, 1)
_, y1_likelihoods = self.gaussian_conditional1(y1,
scales_hat1,
means=means_hat1)
# gmm1 = self._h_s1(z1_hat) #三要素
# y1_hat, y1_likelihoods = self.gaussian1(y1, gmm1[0],gmm1[1],gmm1[2]) # sigma
x1_hat,g1_4,g1_5,g1_6 = self.decoder1(y1_hat)
#############################################
#encoder
x1_warp = kornia.warp_perspective(x1, h_matrix, (x1.size()[-2],x1.size()[-1]))
y2 = self.encoder2(x1_warp,x2)
##end encoder
# hyper for pic2
z2 = self.h_a2(y2)
z2_hat, z2_likelihoods = self.entropy_bottleneck2(z2)
#change
params2 = self.h_s2(z2_hat)
y2_hat = self.gaussian_conditional2._quantize( # pylint: disable=protected-access
y2, 'noise' if self.training else 'dequantize')
ctx_params2 = self.context_prediction2(y2_hat)
gaussian_params2 = self.entropy_parameters2(
torch.cat((params2, ctx_params2, ctx_params1), dim=1))
scales_hat2, means_hat2 = gaussian_params2.chunk(2, 1)
_, y2_likelihoods = self.gaussian_conditional1(y2,
scales_hat2,
means=means_hat2)
# gmm2 = self._h_s2(z2_hat, y1_hat) # 三要素
# y2_hat, y2_likelihoods = self.gaussian2(y2, gmm2[0], gmm2[1], gmm2[2]) # 这里也是临时，待改gmm
# end hyper for pic2
##decoder
x1_hat_warp = kornia.warp_perspective(x1_hat, h_matrix, (x1_hat.size()[-2],x1_hat.size()[-1]))
x2_hat = self.decoder2(y2_hat,x1_hat_warp)
#end decoder
# print(x1.size())
return {
'x1_hat': x1_hat,
'x2_hat': x2_hat,
'likelihoods':{
'y1': y1_likelihoods,
'y2': y2_likelihoods,
'z1': z1_likelihoods,
'z2': z2_likelihoods,
}
}