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model.py
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model.py
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from torchtools import *
from collections import OrderedDict
import math
#import seaborn as sns
import numpy as np
import matplotlib.pyplot as plt
from torch.nn import init
from util import sample_normal
class ConvBlock(nn.Module):
def __init__(self, in_planes, out_planes, userelu=True, momentum=0.1, affine=True, track_running_stats=True):
super(ConvBlock, self).__init__()
self.layers = nn.Sequential()
self.layers.add_module('Conv', nn.Conv2d(in_planes, out_planes,
kernel_size=3, stride=1, padding=1, bias=False))
if tt.arg.normtype == 'batch':
self.layers.add_module('Norm', nn.BatchNorm2d(out_planes, momentum=momentum, affine=affine, track_running_stats=track_running_stats))
elif tt.arg.normtype == 'instance':
self.layers.add_module('Norm', nn.InstanceNorm2d(out_planes))
if userelu:
self.layers.add_module('ReLU', nn.ReLU(inplace=True))
self.layers.add_module(
'MaxPool', nn.MaxPool2d(kernel_size=2, stride=2, padding=0))
def forward(self, x):
out = self.layers(x)
return out
class ConvNet(nn.Module):
def __init__(self, opt, momentum=0.1, affine=True, track_running_stats=True):
super(ConvNet, self).__init__()
self.in_planes = opt['in_planes']
self.out_planes = opt['out_planes']
self.num_stages = opt['num_stages']
if type(self.out_planes) == int:
self.out_planes = [self.out_planes for i in range(self.num_stages)]
assert(type(self.out_planes)==list and len(self.out_planes)==self.num_stages)
num_planes = [self.in_planes,] + self.out_planes
userelu = opt['userelu'] if ('userelu' in opt) else True
conv_blocks = []
for i in range(self.num_stages):
if i == (self.num_stages-1):
conv_blocks.append(
ConvBlock(num_planes[i], num_planes[i+1], userelu=userelu))
else:
conv_blocks.append(
ConvBlock(num_planes[i], num_planes[i+1]))
self.conv_blocks = nn.Sequential(*conv_blocks)
for m in self.modules():
if isinstance(m, nn.Conv2d):
n = m.kernel_size[0] * m.kernel_size[1] * m.out_channels
m.weight.data.normal_(0, math.sqrt(2. / n))
elif isinstance(m, nn.BatchNorm2d):
m.weight.data.fill_(1)
m.bias.data.zero_()
def forward(self, x):
out = self.conv_blocks(x)
out = out.view(out.size(0),-1)
return out
# encoder for imagenet dataset
class EmbeddingImagenet(nn.Module):
def __init__(self,
emb_size):
super(EmbeddingImagenet, self).__init__()
# set size
self.hidden = 64
self.last_hidden = self.hidden * 25
self.emb_size = emb_size
# set layers
self.conv_1 = nn.Sequential(nn.Conv2d(in_channels=3,
out_channels=self.hidden,
kernel_size=3,
padding=1,
bias=False),
nn.BatchNorm2d(num_features=self.hidden),
nn.MaxPool2d(kernel_size=2),
nn.LeakyReLU(negative_slope=0.2, inplace=True))
self.conv_2 = nn.Sequential(nn.Conv2d(in_channels=self.hidden,
out_channels=int(self.hidden*1.5),
kernel_size=3,
bias=False),
nn.BatchNorm2d(num_features=int(self.hidden*1.5)),
nn.MaxPool2d(kernel_size=2),
nn.LeakyReLU(negative_slope=0.2, inplace=True))
self.conv_3 = nn.Sequential(nn.Conv2d(in_channels=int(self.hidden*1.5),
out_channels=self.hidden*2,
kernel_size=3,
padding=1,
bias=False),
nn.BatchNorm2d(num_features=self.hidden * 2),
nn.MaxPool2d(kernel_size=2),
nn.LeakyReLU(negative_slope=0.2, inplace=True),
nn.Dropout2d(0.4))
self.conv_4 = nn.Sequential(nn.Conv2d(in_channels=self.hidden*2,
out_channels=self.hidden*4,
kernel_size=3,
padding=1,
bias=False),
nn.BatchNorm2d(num_features=self.hidden * 4),
nn.MaxPool2d(kernel_size=2),
nn.LeakyReLU(negative_slope=0.2, inplace=True),
nn.Dropout2d(0.5))
self.layer_last = nn.Sequential(nn.Linear(in_features=self.last_hidden * 4,
out_features=self.emb_size, bias=True),
nn.BatchNorm1d(self.emb_size))
def forward(self, input_data):
output_data = self.conv_4(self.conv_3(self.conv_2(self.conv_1(input_data))))
return self.layer_last(output_data.view(output_data.size(0), -1))
class NodeUpdateNetwork(nn.Module):
def __init__(self,
in_features,
num_features,
ratio=[2, 1],
dropout=0.0):
super(NodeUpdateNetwork, self).__init__()
# set size
self.in_features = in_features
self.num_features_list = [num_features * r for r in ratio]
self.dropout = dropout
# layers
layer_list = OrderedDict()
for l in range(len(self.num_features_list)):
# Dimension Reduction
layer_list['conv{}'.format(l)] = nn.Conv2d(
in_channels=self.num_features_list[l - 1] if l > 0 else self.in_features * 3,
out_channels=self.num_features_list[l],
kernel_size=1,
bias=False)
layer_list['norm{}'.format(l)] = nn.BatchNorm2d(num_features=self.num_features_list[l],
)
layer_list['relu{}'.format(l)] = nn.LeakyReLU()
if self.dropout > 0 and l == (len(self.num_features_list) - 1):
layer_list['drop{}'.format(l)] = nn.Dropout2d(p=self.dropout)
self.network = nn.Sequential(layer_list)
def forward(self, node_feat, edge_feat):
# get size
num_tasks = node_feat.size(0)
num_data = node_feat.size(1)
# get eye matrix (batch_size x 2 x node_size x node_size)
diag_mask = 1.0 - torch.eye(num_data).unsqueeze(0).unsqueeze(0).repeat(num_tasks, 2, 1, 1).to(tt.arg.device)
# set diagonal as zero and normalize
edge_feat = F.normalize(edge_feat * diag_mask, p=1, dim=-1)
# compute attention and aggregate
aggr_feat = torch.bmm(torch.cat(torch.split(edge_feat, 1, 1), 2).squeeze(1), node_feat)
node_feat = torch.cat([node_feat, torch.cat(aggr_feat.split(num_data, 1), -1)], -1).transpose(1, 2)
# non-linear transform
node_feat = self.network(node_feat.unsqueeze(-1)).transpose(1, 2).squeeze(-1)
return node_feat
class EdgeUpdateNetwork(nn.Module):
def __init__(self,
in_features,
num_features,
ratio=[2, 2, 1, 1],
separate_dissimilarity=False,
dropout=0.0, arch=None):
super(EdgeUpdateNetwork, self).__init__()
# set size
self.in_features = in_features
self.num_features = num_features
self.num_features_list = [num_features * r for r in ratio]
self.separate_dissimilarity = separate_dissimilarity
self.dropout = dropout
self.arch = arch
# layers
def creat_network(self, name):
layer_list = OrderedDict()
for l in range(len(self.num_features_list)):
# set layer
layer_list[name + 'conv{}'.format(l)] = nn.Conv2d(in_channels=self.num_features_list[l-1] if l > 0 else self.in_features,
out_channels=self.num_features_list[l],
kernel_size=1,
bias=False)
layer_list[name + 'norm{}'.format(l)] = nn.BatchNorm2d(num_features=self.num_features_list[l],
)
layer_list[name + 'relu{}'.format(l)] = nn.LeakyReLU()
if self.dropout > 0:
layer_list[name + 'drop{}'.format(l)] = nn.Dropout2d(p=self.dropout)
layer_list[name + 'conv_out'] = nn.Conv2d(in_channels=self.num_features_list[-1],
out_channels=1,
kernel_size=1)
return layer_list
self.sim_network = nn.Sequential(creat_network(self, 'sim_val'))
if self.arch is 'edge':
mod_self = self
mod_self.num_features_list = [num_features]
self.num_samples = 1
self.W_mean = nn.Sequential(creat_network(mod_self, 'W_mean'))
self.W_bias = nn.Sequential(creat_network(mod_self, 'W_bias'))
self.B_mean = nn.Sequential(creat_network(mod_self, 'B_mean'))
self.B_bias = nn.Sequential(creat_network(mod_self, 'B_bias'))
if self.arch is 'att':
self.attention = nn.Sequential(
nn.Linear(num_features, int(num_features / 4)),
nn.LeakyReLU(),
nn.Linear(int(num_features / 4), 1)
)
def init_weights(m):
if type(m) == nn.Linear:
init.xavier_normal_(m.weight.data)
init.normal_(m.bias.data)
self.attention.apply(init_weights)
def forward(self, node_feat, edge_feat):
if self.arch is 'att':
# task temperature
alpha = self.attention(node_feat.view(-1, self.num_features)).view(node_feat.size(0), -1)# find attention for each task then expand to multi-dim
alpha = F.softmax(alpha, dim=1).unsqueeze(2)
node_feat = node_feat * alpha
# Update adjacency matrix
x_i = node_feat.unsqueeze(2)
x_j = torch.transpose(x_i, 1, 2)
x_ij = torch.abs(x_i - x_j)
x_ij = torch.transpose(x_ij, 1, 3)
# Bayes by Backprop
if self.arch is 'edge':
sim_val = self.sim_network(x_ij)
w_mean = self.W_mean(x_ij)
w_bias = self.W_bias(x_ij)
b_mean = self.B_mean(x_ij)
b_bias = self.B_bias(x_ij)
logit_mean = w_mean * sim_val + b_mean
logit_var = torch.log((sim_val ** 2)*torch.exp(w_bias) + torch.exp(b_bias))
sim_val = F.sigmoid(sample_normal(logit_mean, logit_var, self.num_samples)) # batch * num_samples * node * node
else:
sim_val = F.sigmoid(self.sim_network(x_ij))
if self.separate_dissimilarity:
dsim_val = F.sigmoid(self.dsim_network(x_ij))
else:
dsim_val = 1.0 - sim_val
diag_mask = 1.0 - torch.eye(node_feat.size(1)).unsqueeze(0).unsqueeze(0).repeat(node_feat.size(0), 2, 1, 1).to(tt.arg.device)
edge_feat = edge_feat * diag_mask
merge_sum = torch.sum(edge_feat, -1, True)
# set diagonal as zero and normalize
# edge_feat = F.normalize(sim_val * edge_feat, p=1, dim=-1) * merge_sum
edge_feat = F.normalize(torch.cat([sim_val, dsim_val], 1) * edge_feat, p=1, dim=-1) * merge_sum
force_edge_feat = torch.cat((torch.eye(node_feat.size(1)).unsqueeze(0), torch.zeros(node_feat.size(1), node_feat.size(1)).unsqueeze(0)), 0).unsqueeze(0).repeat(node_feat.size(0), 1, 1, 1).to(tt.arg.device)
edge_feat = edge_feat + force_edge_feat
edge_feat = edge_feat + 1e-6
edge_feat = edge_feat / torch.sum(edge_feat, dim=1).unsqueeze(1).repeat(1, 2, 1, 1)
return edge_feat
class GraphNetwork(nn.Module):
def __init__(self,
in_features,
node_features,
edge_features,
num_layers,
num_cell,
dropout=0.0, arch = None):
super(GraphNetwork, self).__init__()
# set size
self.in_features = in_features
self.node_features = node_features
self.edge_features = edge_features
self.num_layers = num_layers
self.dropout = dropout
self.num_cell = num_cell
self.rnn = nn.GRUCell(self.node_features, self.node_features, bias=True)
self.arch = arch
# # build Mixture of Experts layer
# self.MOE_conv = nn.ModuleList()
# self.MOE_relu = nn.ModuleList()
#
#
# for _ in range(self.num_cell):
# m = nn.Linear(self.node_features, self.node_features)
# if isinstance(m, nn.Linear):
# init.xavier_normal_(m.weight.data)
# init.normal_(m.bias.data)
# self.MOE_conv.append(m)
# self.MOE_relu.append(nn.LeakyReLU())
#
# self.gates = nn.Sequential(
# nn.Linear(self.node_features, self.num_cell, bias=False),
# nn.Softmax()
# )
#
# # initialize Gating function
# for layer in self.gates:
# if isinstance(layer, nn.Linear):
# init.xavier_normal_(layer.weight.data)
# initialize GRU cells
if isinstance(self.rnn, nn.GRUCell):
for param in self.rnn.parameters():
if len(param.shape) >= 2:
init.orthogonal_(param.data)
else:
init.normal_(param.data)
# for each layer
for l in range(self.num_layers):
# set edge to node
edge2node_net = NodeUpdateNetwork(in_features=self.in_features if l == 0 else self.node_features,
num_features=self.node_features,
dropout=self.dropout if l < self.num_layers-1 else 0.0)
# set node to edge
node2edge_net = EdgeUpdateNetwork(in_features=self.node_features,
num_features=self.edge_features,
separate_dissimilarity=False,
dropout=self.dropout if l < self.num_layers-1 else 0.0, arch = self.arch)
self.add_module('edge2node_net{}'.format(l), edge2node_net)
self.add_module('node2edge_net{}'.format(l), node2edge_net)
# forward
def forward(self, node_feat, edge_feat):
# for each layer
node_feat_list = []
edge_feat_list = []
edge_feat_temp_list = []
node_feat_temp_list = []
batch_size = node_feat.size(0)
idx = list(range(batch_size+1))[::int(batch_size/self.num_cell)]
for l in range(self.num_layers):
for i in range(self.num_cell):
# (1) edge to node
node_feat_temp = self._modules['edge2node_net{}'.format(l)](node_feat[idx[i]: idx[i+1], :], edge_feat[idx[i]: idx[i+1], :])
if i == 0:
hidden = torch.zeros_like(node_feat_temp.contiguous().view(-1, self.node_features))
hidden = self.rnn(node_feat_temp.contiguous().view(-1, self.node_features), hidden)
# (2) node to edge
edge_feat_temp = self._modules['node2edge_net{}'.format(l)](hidden.view(node_feat_temp.size(0), -1, self.node_features), edge_feat[idx[i]: idx[i+1], :])
# save node and edge feature (in each cell)
edge_feat_temp_list.append(edge_feat_temp)
node_feat_temp_list.append(node_feat_temp)
# update node and edge feat
edge_feat = torch.cat(edge_feat_temp_list)
node_feat = torch.cat(node_feat_temp_list)
# clear cache
edge_feat_temp_list = []
node_feat_temp_list = []
edge_feat_list.append(edge_feat)
node_feat_list.append(node_feat)
return edge_feat_list, node_feat_list