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A2KA.py
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A2KA.py
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import torch
#A2KA Module
device=torch.device("cuda:1" if torch.cuda.is_available() else "cpu")
device2 = torch.device("cpu")
torch.manual_seed(1)
import torch
import torch.nn as nn
import torch.nn.functional as F
import numpy as np
torch.manual_seed(1)
import math
class Attention(nn.Module):
def __init__(self,hidden_dim):
super(Attention, self).__init__()
# The linear layer that maps from hidden state space to tag space
self.atten_Matrix = nn.Linear(hidden_dim,1)
self.relu = nn.ReLU()
self.ll = nn.Embedding(500,hidden_dim)
self.layer_norm = nn.LayerNorm(hidden_dim)
def forward(self, embding):
rate_matrix = self.atten_Matrix(embding)
rate_matrix = self.relu(rate_matrix)
att_rate = F.softmax(rate_matrix,dim=1)
lll= rate_matrix.size()[1]
sum_ = (embding*att_rate).sum(1)/math.sqrt(lll)
sum_ = self.layer_norm(sum_)
return sum_,att_rate
torch.manual_seed(1)
class FeedForward_Norm(nn.Module):
def __init__(self, d_model, dim_feedforward=2048, dropout=0.1):
super(FeedForward_Norm, self).__init__()
self.linear1 = nn.Linear(d_model, dim_feedforward)
self.dropout = nn.Dropout(dropout)
self.linear2 = nn.Linear(dim_feedforward, d_model)
self.norm = nn.LayerNorm(d_model)
self.dropout2 = nn.Dropout(dropout)
def forward(self, src):
# Feedforward neural network with residual connection and layer normalization
src2 = self.linear2(self.dropout(F.relu(self.linear1(src))))
src = src + self.dropout2(src2)
src = self.norm(src)
return src
class A2KA(nn.Module):
def __init__(self, hidden_dim,config):
super(A2KA, self).__init__()
self.Att_config = config
self.dropout = nn.Dropout(p=0.1)
self.hidden_dim = hidden_dim
real_dim = hidden_dim
Att_li = []
for fig in self.Att_config:
sub_li = []
for k in range(fig):
sub_li.append(Attention(real_dim))
Att_li.append(nn.ModuleList(sub_li))
self.Att_li = nn.ModuleList(Att_li)
self.AAt = Attention(real_dim)
pro_li = []
for fig in self.Att_config:
sub_li = []
to_dim = real_dim/fig
# print(to_dim)
for k in range(fig):
sub_li.append(nn.Linear(real_dim,int(to_dim)))
pro_li.append(nn.ModuleList(sub_li))
self.pro_li = nn.ModuleList(pro_li)
project_li = []
for i in range(len(self.Att_config)):
project_li.append(nn.Linear(1,real_dim))
self.project_li = nn.ModuleList(project_li)
project_li = []
for i in range(len(self.Att_config)):
project_li.append(nn.Linear(real_dim,real_dim))
self.FI_li = nn.ModuleList(project_li)
set_dim = int(real_dim/4)
project_li = []
for i in range(len(self.Att_config)):
project_li.append(nn.Linear(real_dim,set_dim))
self.Set_li = nn.ModuleList(project_li)
length = (len(self.Att_config))*set_dim+real_dim
self.hidden2p = nn.Linear(length,1)
#the norm function is variable, we provide two kinds of example for A2KA
self.norm_li = nn.ModuleList([FeedForward_Norm(hidden_dim) for _ in range(len(self.Att_config))])
# self.norm_li = nn.ModuleList([nn.LayerNorm(hidden_dim) for _ in range(len(self.Att_config))])
def forward(self, embding):
batch_size = (embding.size()[0])
vec_store = []
t_emb = embding
attention_dis = []
for i,fig in enumerate(self.Att_config):
vec_s = []
att_s = []
for k in range(fig):
vec,att_ = self.Att_li[i][k](t_emb)
vec = self.pro_li[i][k](vec)
vec = F.relu(vec)
vec_s.append(vec)
att_s.append(att_)
att_s = torch.stack(att_s).squeeze(3)
sum_att = att_s.sum(0).unsqueeze(2)
attention_dis.append(att_s.sum(0).unsqueeze(2))
sum_att = self.project_li[i](sum_att)
t_emb = (t_emb*sum_att)+t_emb
t_emb = self.norm_li[i](t_emb)
vec_s = torch.stack(vec_s)
vec_s = vec_s.transpose(0,1)
z = vec_s
z = z.permute(0,2,1)
batch = z.size()[0]
output = z.reshape(batch,-1)
output = F.relu(self.FI_li[i](output))+output
output = F.relu(self.Set_li[i](output))
vec_store.append(output)
ott = torch.stack(vec_store).transpose(0,1).reshape(batch_size,-1)
sum_,_ = self.AAt(t_emb)
um_ = torch.cat((sum_,ott),1)
um_ = self.dropout(um_)
P = torch.sigmoid(self.hidden2p(um_))
return P,attention_dis
# example:
# hidden_dimention = 512
# config = [6,12,12,5]
# model =A2KA( hidden_dimention,config)