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model_domaint.py
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model_domaint.py
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import numpy as np
import torch
import torch.nn as nn
import torch.nn.functional as F
from torch_geometric.nn import GCN
def neighList_to_edgeList(adj):
edge_list = []
for i in range(adj.shape[0]):
for j in torch.argwhere(adj[i, :] >0):
edge_list.append((int(i), int(j)))
return edge_list
class AvgReadout(nn.Module):
def __init__(self):
super(AvgReadout, self).__init__()
def forward(self, seq):
return torch.mean(seq, 1)
class MaxReadout(nn.Module):
def __init__(self):
super(MaxReadout, self).__init__()
def forward(self, seq):
return torch.max(seq, 1).values
class MinReadout(nn.Module):
def __init__(self):
super(MinReadout, self).__init__()
def forward(self, seq):
return torch.min(seq, 1).values
class WSReadout(nn.Module):
def __init__(self):
super(WSReadout, self).__init__()
def forward(self, seq, query):
query = query.permute(0, 2, 1)
sim = torch.matmul(seq, query)
sim = F.softmax(sim, dim=1)
sim = sim.repeat(1, 1, 64)
out = torch.mul(seq, sim)
out = torch.sum(out, 1)
return out
class Discriminator(nn.Module):
def __init__(self, n_h, negsamp_round):
super(Discriminator, self).__init__()
self.f_k = nn.Bilinear(n_h, n_h, 1)
for m in self.modules():
self.weights_init(m)
self.negsamp_round = negsamp_round
def weights_init(self, m):
if isinstance(m, nn.Bilinear):
torch.nn.init.xavier_uniform_(m.weight.data)
if m.bias is not None:
m.bias.data.fill_(0.0)
def forward(self, c, h_pl):
scs = []
# positive
scs.append(self.f_k(h_pl, c))
# negative
c_mi = c
for _ in range(self.negsamp_round):
c_mi = torch.cat((c_mi[-2:-1, :], c_mi[:-1, :]), 0)
scs.append(self.f_k(h_pl, c_mi))
logits = torch.cat(tuple(scs))
return logits
class Model(nn.Module):
def __init__(self, n_in, n_h, activation, negsamp_round, readout):
super(Model, self).__init__()
self.read_mode = readout
self.dense_stru = nn.Linear(n_in, n_h)
self.gat_layer = GCN(n_h, n_in, num_layers=2)
self.dense_attr_1 = nn.Linear(n_in, n_h)
self.dense_attr_2 = nn.Linear(n_h, n_in)
self.dropout = 0.
self.act = nn.ReLU()
if readout == 'max':
self.read = MaxReadout()
elif readout == 'min':
self.read = MinReadout()
elif readout == 'avg':
self.read = AvgReadout()
elif readout == 'weighted_sum':
self.read = WSReadout()
self.disc = Discriminator(n_h, negsamp_round)
def double_recon_loss(self, x,
x_,
s,
s_,
weight=1,
):
# attribute reconstruction loss
diff_attr = torch.pow(x - x_, 2)
attr_error = torch.sqrt(torch.sum(diff_attr, 1))
# diff_stru = torch.pow(s - s_, 2)
# stru_error = torch.sqrt(torch.sum(diff_stru, 1))
# score = weight * attr_error + (1 - weight) * stru_error
score = weight * attr_error
return score
def model_enc(self, x, edge_index):
"""
Forward computation.
Parameters
----------
x : torch.Tensor
Input attribute embeddings.
edge_index : torch.Tensor
Edge index.
batch_size : int
Batch size.
Returns
-------
x_ : torch.Tensor
Reconstructed attribute embeddings.
s_ : torch.Tensor
Reconstructed adjacency matrix.
"""
h = self.dense_stru(x)
if self.act is not None:
h = self.act(h)
h = F.dropout(h, self.dropout)
self.emb = self.gat_layer(h, edge_index)
# s_ = torch.sigmoid(self.emb @ self.emb.T)
x = self.dense_attr_1(x)
if self.act is not None:
x = self.act(x)
x = F.dropout(x, self.dropout)
x = self.dense_attr_2(x)
x_ = F.dropout(x, self.dropout)
# x_ = self.emb @ x.T
# return x_, s_
return x_, x_
def forward(self, seq1, adj, idx_train, idx_test, sparse=False):
adj = torch.squeeze(adj)
seq1 = torch.squeeze(seq1)
edge_index = neighList_to_edgeList(adj)
edge_index = torch.tensor(np.array(edge_index)).T.cuda()
# edge_index = torch.tensor(np.array(edge_index)).T
x_, s_ = self.model_enc(seq1, edge_index)
score = self.double_recon_loss(seq1[idx_train, :],
x_[idx_train, :],
adj[idx_train, :],
s_[idx_train, :],
)
loss = torch.mean(score)
score_test = self.double_recon_loss(seq1[idx_test, :],
x_[idx_test, :],
adj[idx_test, :],
s_[idx_test, :],
)
return loss, score_test