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model.py
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model.py
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import torch
import torch.nn as nn
from operations import *
from torch.autograd import Variable
# from utils import drop_path
class Cell(nn.Module):
def __init__(self, genotype, C_prev_prev, C_prev, C, reduction, reduction_prev):
super(Cell, self).__init__()
print(C_prev_prev, C_prev, C)
self.reduction = reduction
if reduction_prev is None:
self.preprocess0 = Identity()
elif reduction_prev is True:
self.preprocess0 = FactorizedReduce(C_prev_prev, C)
else:
self.preprocess0 = ReLUConvBN(C_prev_prev, C, 1, 1, 0)
self.preprocess1 = ReLUConvBN(C_prev, C, 1, 1, 0)
if reduction:
op_names, indices = zip(*genotype.reduce)
concat = genotype.reduce_concat
else:
op_names, indices = zip(*genotype.normal)
concat = genotype.normal_concat
assert len(op_names) == len(indices)
self._steps = len(op_names) // 2
self._concat = concat
self.multiplier = len(concat)
self._ops = nn.ModuleList()
for name, index in zip(op_names, indices):
stride = 2 if reduction and index < 2 else 1
if reduction_prev is None and index == 0:
op = OPS[name](C_prev_prev, C, stride, True)
else:
op = OPS[name](C, C, stride, True)
self._ops += [op]
self._indices = indices
def forward(self, s0, s1, drop_prob):
s0 = self.preprocess0(s0)
s1 = self.preprocess1(s1)
states = [s0, s1]
for i in range(self._steps):
h1 = states[self._indices[2*i]]
h2 = states[self._indices[2*i+1]]
op1 = self._ops[2*i]
op2 = self._ops[2*i+1]
h1 = op1(h1)
h2 = op2(h2)
# if self.training and drop_prob > 0.:
# if not isinstance(op1, Identity):
# h1 = drop_path(h1, drop_prob)
# if not isinstance(op2, Identity):
# h2 = drop_path(h2, drop_prob)
s = h1 + h2
states += [s]
return torch.cat([states[i] for i in self._concat], dim=1)
class AuxiliaryHeadImageNet(nn.Module):
def __init__(self, C, num_classes):
"""assuming input size 14x14"""
super(AuxiliaryHeadImageNet, self).__init__()
self.features = nn.Sequential(
nn.ReLU(inplace=True),
nn.AvgPool2d(5, stride=2, padding=0, count_include_pad=False),
nn.Conv2d(C, 128, 1, bias=False),
nn.BatchNorm2d(128),
nn.ReLU(inplace=True),
nn.Conv2d(128, 768, 2, bias=False),
nn.BatchNorm2d(768),
nn.ReLU(inplace=True)
)
self.classifier = nn.Linear(768, num_classes)
def forward(self, x):
x = self.features(x)
x = self.classifier(x.view(x.size(0),-1))
return x
class NetworkImageNet(nn.Module):
def __init__(self, C, num_classes, layers, auxiliary, genotype):
super(NetworkImageNet, self).__init__()
self._layers = layers
self._auxiliary = auxiliary
self.conv0 = nn.Conv2d(3, 96, kernel_size=3, stride=2, padding=0, bias=False)
self.conv0_bn = nn.BatchNorm2d(96, eps=1e-3)
self.stem1 = Cell(genotype, 96, 96, C // 4, True, None)
self.stem2 = Cell(genotype, 96, C * self.stem1.multiplier // 4, C // 2, True, True)
C_prev_prev, C_prev, C_curr = C * self.stem1.multiplier // 4, C * self.stem2.multiplier // 2, C
self.cells = nn.ModuleList()
reduction_prev = True
for i in xrange(layers):
if i in [layers // 3, 2 * layers // 3]:
C_curr *= 2
reduction = True
else:
reduction = False
cell = Cell(genotype, C_prev_prev, C_prev, C_curr, reduction, reduction_prev)
reduction_prev = reduction
self.cells += [cell]
C_prev_prev, C_prev = C_prev, cell.multiplier * C_curr
if i == 2 * layers // 3:
C_to_auxiliary = C_prev
if auxiliary:
self.auxiliary_head = AuxiliaryHeadImageNet(C_to_auxiliary, num_classes)
self.relu = nn.ReLU(inplace=False)
self.global_pooling = nn.AdaptiveAvgPool2d(1)
self.classifier = nn.Linear(C_prev, num_classes)
def forward(self, input):
logits_aux = None
s0 = self.conv0(input)
s0 = self.conv0_bn(s0)
s1 = self.stem1(s0, s0, self.drop_path_prob)
s0, s1 = s1, self.stem2(s0, s1, self.drop_path_prob)
for i, cell in enumerate(self.cells):
s0, s1 = s1, cell(s0, s1, self.drop_path_prob)
if i == 2 * self._layers // 3:
if self._auxiliary and self.training:
logits_aux = self.auxiliary_head(s1)
s1 = self.relu(s1)
out = self.global_pooling(s1)
logits = self.classifier(out.view(out.size(0), -1))
return logits, logits_aux