def __init__(self,
cl=32,
cm=32,
ch=16,
nframes = 7,
input_nc = 3,
output_nc = 3,
upscale_factor=4):
super(RBPN, self).__init__()
self.nframes = nframes
self.upscale_factor = upscale_factor
#Initial Feature Extraction
self.conv1 = M.Sequential(
M.Conv2d(input_nc, cl, kernel_size=3, stride=1, padding=1),
M.PReLU(),
)
self.conv2 = M.Sequential(
M.Conv2d(input_nc*2+0, cm, kernel_size=3, stride=1, padding=1),
M.PReLU(),
)
# projection module
self.Projection = Projection_Module(cl, cm, ch)
# reconstruction module
self.reconstruction = M.Conv2d((self.nframes-1)*ch, output_nc, kernel_size=3, stride=1, padding=1)
def __init__(self,
in_channels=3,
out_channels=3,
d=56,
s=12,
upscale_factor=4):
super(FSRCNN, self).__init__()
l = []
l.append(
M.Sequential(Conv2d(in_channels, d, 5, 1, 2),
M.PReLU(num_parameters=1, init=0.25)))
l.append(
M.Sequential(Conv2d(d, s, 1, 1, 0),
M.PReLU(num_parameters=1, init=0.25)))
for i in range(4):
l.append(
M.Sequential(Conv2d(s, s, 3, 1, 1),
M.PReLU(num_parameters=1, init=0.25)))
l.append(
M.Sequential(Conv2d(s, d, 1, 1, 0),
M.PReLU(num_parameters=1, init=0.25)))
l.append(ConvTranspose2d(d, out_channels, 8, upscale_factor,
padding=2))
self.convs = M.Sequential(*l)
def __init__(self, num_channels, filter_size, stride, padding):
super(UPU, self).__init__()
self.deconv1 = M.Sequential(
ConvTranspose2d(num_channels, num_channels, filter_size, stride,
padding), M.PReLU(num_parameters=1, init=0.25))
self.conv1 = M.Sequential(
Conv2d(num_channels, num_channels, filter_size, stride, padding),
M.PReLU(num_parameters=1, init=0.25))
self.deconv2 = M.Sequential(
ConvTranspose2d(num_channels, num_channels, filter_size, stride,
padding), M.PReLU(num_parameters=1, init=0.25))
def __init__(self,
in_channels,
out_channels,
kernel_size=3,
activation='prelu'):
super(ResBlock, self).__init__()
if activation == 'relu':
self.act = M.ReLU()
elif activation == 'prelu':
self.act = M.PReLU(num_parameters=1, init=0.25)
else:
raise NotImplementedError("not implemented activation")
m = []
m.append(
M.Conv2d(in_channels,
out_channels,
kernel_size=kernel_size,
stride=1,
padding=(kernel_size // 2)))
m.append(self.act)
m.append(
M.Conv2d(out_channels,
out_channels,
kernel_size=kernel_size,
stride=1,
padding=(kernel_size // 2)))
self.body = M.Sequential(*m)
def __init__(self, ch, cl):
super(Decoder, self).__init__()
self.model = M.Sequential(
ResBlocks(channel_num=ch, resblock_num=5, kernel_size=3),
M.Conv2d(ch, cl, kernel_size=8, stride=4, padding=2),
M.PReLU(),
)
def __init__(self, cm, ch):
super(MISR_Block, self).__init__()
self.model = M.Sequential(
ResBlocks(channel_num=cm, resblock_num=5, kernel_size=3),
M.ConvTranspose2d(cm, ch, kernel_size=8, stride=4, padding=2),
M.PReLU(),
)
def __init__(self, ch):
super(Residual_Blocks, self).__init__()
self.model = M.Sequential(
ResBlocks(channel_num=ch, resblock_num=5, kernel_size=3),
M.Conv2d(ch, ch, kernel_size=3, stride=1, padding=1),
M.PReLU(),
)
def __init__(self, in_ch, out_ch, stride=1, r_lim=7, K=4):
"""
Implementation of the Extremely Efficient Spatial Pyramid module introduced in
"ESPNetv2: A Light-weight, Power Efficient, and General Purpose Convolutional Neural Network"
<https://arxiv.org/pdf/1811.11431.pdf>
Parameters
----------
in_ch (int): number of channels for input
out_ch (int): number of channels for output
stride (int): stride of the convs
r_lim (int): A maximum value of receptive field allowed for EESP block
K (int): number of parallel branches
"""
super(EESP, self).__init__()
hidden_ch = int(out_ch // K)
hidden_ch1 = out_ch - hidden_ch * (K - 1)
assert hidden_ch1 == hidden_ch, \
"hidden size of n={} must equal to hidden size of n1={}".format(hidden_ch, hidden_ch1)
self.g_conv1 = Conv2d(in_ch,
hidden_ch,
1,
stride=1,
groups=K,
activation=M.PReLU(hidden_ch))
self.spp_convs = []
for i in range(K):
ksize = int(3 + i * 2)
dilation = int((ksize - 1) / 2) if ksize <= r_lim else 1
self.spp_convs.append(
M.Conv2d(hidden_ch,
hidden_ch,
3,
stride=stride,
padding=dilation,
dilation=dilation,
groups=hidden_ch,
bias=False))
self.conv_concat = Conv2d(out_ch, out_ch, groups=K, activation=None)
self.bn_pr = M.Sequential(M.BatchNorm2d(out_ch), M.PReLU(out_ch))
self.module_act = M.PReLU(out_ch)
self.K = K
self.stride = stride
def __init__(self, cl, ch):
super(SISR_Block, self).__init__()
self.num_stages = 3
self.pre_deal = M.Conv2d(cl, ch, kernel_size=1, stride=1, padding=0)
self.prelu = M.PReLU(num_parameters=1, init=0.25)
self.UPU1 = UPU(ch, 8, stride=4, padding=2)
self.UPU2 = UPU(ch, 8, stride=4, padding=2)
self.UPU3 = UPU(ch, 8, stride=4, padding=2)
self.DPU1 = DPU(ch, 8, stride=4, padding=2)
self.DPU2 = DPU(ch, 8, stride=4, padding=2)
self.reconstruction = M.Conv2d(self.num_stages * ch, ch, kernel_size=1, stride=1, padding=0)
def __init__(self,
in_channels=3,
out_channels=3,
n_0=256,
n_R=64,
iterations_num=10,
upscale_factor=4):
super(DBPN, self).__init__()
filter_size = upscale_factor + 4
stride = upscale_factor
padding = 2
self.iterations_num = iterations_num
self.conv1 = M.Sequential(Conv2d(in_channels, n_0, 3, 1, 1),
M.PReLU(num_parameters=1, init=0.25))
self.conv2 = M.Sequential(Conv2d(n_0, n_R, 1, 1, 0),
M.PReLU(num_parameters=1, init=0.25))
self.UPU = UPU(n_R, filter_size, stride, padding)
self.DPU = DPU(n_R, filter_size, stride, padding)
self.conv3 = M.Sequential(
Conv2d(n_R * iterations_num, out_channels, 3, 1, 1),
M.PReLU(num_parameters=1, init=0.25))
def __init__(self,
in_ch,
out_ch,
stride=2,
r_lim=7,
K=4,
refin=True,
refin_ch=3):
"""
Implementation of the Extremely Efficient Spatial Pyramid module introduced in
"ESPNetv2: A Light-weight, Power Efficient, and General Purpose Convolutional Neural Network"
<https://arxiv.org/pdf/1811.11431.pdf>
Parameters
----------
in_ch (int): number of channels for input
out_ch (int): number of channels for output
stride (int): stride of the convs
r_lim (int): A maximum value of receptive field allowed for EESP block
K (int): number of parallel branches
refin (bool): whether use the inference from input image
"""
super(SESSP, self).__init__()
eesp_out = out_ch - in_ch
self.eesp = EESP(in_ch, eesp_out, stride=stride, r_lim=r_lim, K=K)
self.avg_pool = M.AvgPool2d(3, stride=stride, padding=1)
self.refin = refin
self.stride = stride
self.activation = M.PReLU(out_ch)
if refin:
self.refin_conv = M.Sequential(
Conv2d(refin_ch,
refin_ch,
ksize=3,
stride=1,
padding=1,
activation=M.PReLU(refin_ch)),
Conv2d(refin_ch, out_ch, activation=None))
def __init__(self, in_ch=3, num_classes=1000, scale=1.0):
"""
Implementation of the ESPNetV2 introduced in
"ESPNetv2: A Light-weight, Power Efficient, and General Purpose Convolutional Neural Network"
<https://arxiv.org/pdf/1811.11431.pdf>
Parameters
----------
in_ch (int): number of channels for input
num_classes (int): number of classes
scale (float): the scale rate for the net
"""
super(EspNetV2, self).__init__()
reps = [0, 3, 7, 3] #how many times the essp block repeat
r_lims = [13, 11, 9, 7, 5]
K = [4] * len(r_lims)
base = 32
config_len = 5
config = [base] * config_len
base_s = 0
for i in range(config_len):
if i == 0:
base_s = int(base * scale)
base_s = math.ceil(base_s / K[0]) * K[0]
config[i] = base if base_s > base else base_s
else:
config[i] = base_s * pow(2, i)
if scale <= 1.5:
config.append(1024)
elif scale <= 2.0:
config.append(1280)
else:
ValueError(
"Configuration for scale={} not supported".format(scale))
ref_input = in_ch
self.reinf = True
self.level1 = Conv2d(in_ch,
config[0],
3,
stride=2,
padding=1,
activation=M.PReLU(config[0]))
self.level2_0 = SESSP(config[0],
config[1],
stride=2,
r_lim=r_lims[0],
K=K[0],
refin=self.reinf,
refin_ch=ref_input)
self.level3_0 = SESSP(config[1],
config[2],
stride=2,
r_lim=r_lims[1],
K=K[1],
refin=self.reinf,
refin_ch=ref_input)
self.level3 = []
for i in range(reps[1]):
self.level3.append(
EESP(config[2], config[2], stride=1, r_lim=r_lims[2], K=K[2]))
self.level4_0 = SESSP(config[2],
config[3],
stride=2,
r_lim=r_lims[2],
K=K[2],
refin=self.reinf,
refin_ch=ref_input)
self.level4 = []
for i in range(reps[2]):
self.level4.append(
EESP(config[3], config[3], stride=1, r_lim=r_lims[3], K=K[3]))
self.level5_0 = SESSP(config[3],
config[4],
stride=2,
r_lim=r_lims[3],
K=K[3],
refin=self.reinf,
refin_ch=ref_input)
self.level5 = []
for i in range(reps[3]):
self.level5.append(
EESP(config[4], config[4], stride=1, r_lim=r_lims[4], K=K[4]))
self.level5.append(
Conv2d(config[4],
config[4],
ksize=3,
stride=1,
padding=1,
groups=config[4],
activation=M.PReLU(config[4])))
self.level5.append(
Conv2d(config[4],
config[5],
ksize=1,
stride=1,
padding=0,
groups=K[3],
activation=M.PReLU(config[5])))
self.classifier = M.Linear(config[5], num_classes)
self.init_params()