引自：https://blog.csdn.net/no1xiaoqianqian/article/details/130593783
友好借鉴，总体抄袭。
所需要的文件如下：https://download.csdn.net/download/m0_37567738/88340795
import os
import torch
import torch.nn as nn
import numpy as np
class TextRNN(nn.Module):
def __init__(self, Config):
super(TextRNN, self).__init__()
self.hidden_size = 128 # lstm隐藏层
self.num_layers = 2 # lstm层数
self.embedding = nn.Embedding(Config.n_vocab, Config.embed_dim)
self.lstm = nn.LSTM(Config.embed_dim, self.hidden_size, self.num_layers,
bidirectional=True, batch_first=True, dropout=Config.dropout)
self.fc = nn.Linear(self.hidden_size * 2, Config.num_classes)
def forward(self, x):
out = self.embedding(x) # [batch_size, seq_len, embeding]=[128, 32, 300]
out, _ = self.lstm(out)
out = self.fc(out[:, -1, :]) # 句子最后时刻的 hidden state
return out
import torch
import torch.nn as nn
import torch.nn.functional as F
import numpy as np
import copy
class Transformer(nn.Module):
def __init__(self, Config):
super(Transformer, self).__init__()
self.hidden = 1024
self.last_hidden = 512
self.num_head = 5
self.num_encoder = 2
self.dim_model = 300
self.embedding = nn.Embedding(Config.n_vocab, Config.embed_dim)
self.postion_embedding = Positional_Encoding(Config.embed_dim, Config.all_seq_len, Config.dropout, Config.device)
self.encoder = Encoder(self.dim_model, self.num_head, self.hidden, Config.dropout)
self.encoders = nn.ModuleList([
copy.deepcopy(self.encoder)
# Encoder(config.dim_model, config.num_head, config.hidden, config.dropout)
for _ in range(self.num_encoder)])
self.fc1 = nn.Linear(Config.all_seq_len * self.dim_model, Config.num_classes)
# self.fc2 = nn.Linear(config.last_hidden, config.num_classes)
# self.fc1 = nn.Linear(config.dim_model, config.num_classes)
def forward(self, x):
out = self.embedding(x)
out = self.postion_embedding(out)
for encoder in self.encoders:
out = encoder(out)
out = out.view(out.size(0), -1)
# out = torch.mean(out, 1)
out = self.fc1(out)
return out
class Encoder(nn.Module):
def __init__(self, dim_model, num_head, hidden, dropout):
super(Encoder, self).__init__()
self.attention = Multi_Head_Attention(dim_model, num_head, dropout)
self.feed_forward = Position_wise_Feed_Forward(dim_model, hidden, dropout)
def forward(self, x):
out = self.attention(x)
out = self.feed_forward(out)
return out
class Positional_Encoding(nn.Module):
def __init__(self, embed, pad_size, dropout, device):
super(Positional_Encoding, self).__init__()
self.device = device
self.pe = torch.tensor([[pos / (10000.0 ** (i // 2 * 2.0 / embed)) for i in range(embed)] for pos in range(pad_size)])
self.pe[:, 0::2] = np.sin(self.pe[:, 0::2])
self.pe[:, 1::2] = np.cos(self.pe[:, 1::2])
self.dropout = nn.Dropout(dropout)
def forward(self, x):
out = x + nn.Parameter(self.pe, requires_grad=False).to(self.device)
out = self.dropout(out)
return out
class Scaled_Dot_Product_Attention(nn.Module):
'''Scaled Dot-Product Attention '''
def __init__(self):
super(Scaled_Dot_Product_Attention, self).__init__()
def forward(self, Q, K, V, scale=None):
'''
Args:
Q: [batch_size, len_Q, dim_Q]
K: [batch_size, len_K, dim_K]
V: [batch_size, len_V, dim_V]
scale: 缩放因子 论文为根号dim_K
Return:
self-attention后的张量，以及attention张量
'''
attention = torch.matmul(Q, K.permute(0, 2, 1))
if scale:
attention = attention * scale
# if mask: # TODO change this
# attention = attention.masked_fill_(mask == 0, -1e9)
attention = F.softmax(attention, dim=-1)
context = torch.matmul(attention, V)
return context
class Multi_Head_Attention(nn.Module):
def __init__(self, dim_model, num_head, dropout=0.0):
super(Multi_Head_Attention, self).__init__()
self.num_head = num_head
assert dim_model % num_head == 0
self.dim_head = dim_model // self.num_head
self.fc_Q = nn.Linear(dim_model, num_head * self.dim_head)
self.fc_K = nn.Linear(dim_model, num_head * self.dim_head)
self.fc_V = nn.Linear(dim_model, num_head * self.dim_head)
self.attention = Scaled_Dot_Product_Attention()
self.fc = nn.Linear(num_head * self.dim_head, dim_model)
self.dropout = nn.Dropout(dropout)
self.layer_norm = nn.LayerNorm(dim_model)
def forward(self, x):
batch_size = x.size(0)
Q = self.fc_Q(x)
K = self.fc_K(x)
V = self.fc_V(x)
Q = Q.view(batch_size * self.num_head, -1, self.dim_head)
K = K.view(batch_size * self.num_head, -1, self.dim_head)
V = V.view(batch_size * self.num_head, -1, self.dim_head)
# if mask: # TODO
# mask = mask.repeat(self.num_head, 1, 1) # TODO change this
scale = K.size(-1) ** -0.5 # 缩放因子
context = self.attention(Q, K, V, scale)
context = context.view(batch_size, -1, self.dim_head * self.num_head)
out = self.fc(context)
out = self.dropout(out)
out = out + x # 残差连接
out = self.layer_norm(out)
return out
class Position_wise_Feed_Forward(nn.Module):
def __init__(self, dim_model, hidden, dropout=0.0):
super(Position_wise_Feed_Forward, self).__init__()
self.fc1 = nn.Linear(dim_model, hidden)
self.fc2 = nn.Linear(hidden, dim_model)
self.dropout = nn.Dropout(dropout)
self.layer_norm = nn.LayerNorm(dim_model)
def forward(self, x):
out = self.fc1(x)
out = F.relu(out)
out = self.fc2(out)
out = self.dropout(out)
out = out + x # 残差连接
out = self.layer_norm(out)
return out
import torch.nn as nn
import torch
import torch.nn.functional as F
class TextCNN(nn.Module):
def __init__(self, Config):
super(TextCNN, self).__init__()
self.filter_sizes = (2, 3, 4) # 卷积核尺寸
self.num_filters = 64 # 卷积核数量(channels数)
self.embedding = nn.Embedding(Config.n_vocab, Config.embed_dim)
self.convs = nn.ModuleList(
[nn.Conv2d(1, self.num_filters, (k, Config.embed_dim)) for k in self.filter_sizes])
self.dropout = nn.Dropout(Config.dropout)
self.fc = nn.Linear(self.num_filters * len(self.filter_sizes), Config.num_classes)
def conv_and_pool(self, x, conv):
x = F.relu(conv(x))
x = x.squeeze(3)
x = F.max_pool1d(x, x.size(2)).squeeze(2)
return x
def forward(self, x):
out = self.embedding(x)
out = out.unsqueeze(1)
out = torch.cat([self.conv_and_pool(out, conv) for conv in self.convs], 1)
out = self.dropout(out)
out = self.fc(out)
return out
import matplotlib.pyplot as plt
import numpy as np
def draw_loss_pic(train_loss, test_loss, y):
x = np.linspace(0, len(train_loss), len(train_loss))
plt.plot(x, train_loss, label="train_" + y, linewidth=1.5)
plt.plot(x, test_loss, label="test_" + y, linewidth=1.5)
plt.xlabel("epoch")
plt.ylabel(y)
plt.legend()
plt.show()
import torch
class Config():
train_data_path = '../data/virus_train.txt'
test_data_path = '../data/virus_eval_labeled.txt'
vocab_path = '../data/vocab.pkl'
split_word_all_path = '../data/split_word_all.txt'
model_file_name_path = '../data/vec_model.txt'
id_vec_path = '../data/id_vec.pkl'
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
word_level = True # 按照字级别进行分词
embedding_pretrained = False # 是否使用预训练的词向量
label_fields = {'neural': 0, 'happy': 1, 'angry': 2, 'sad': 3, 'fear': 4, 'surprise': 5}
all_seq_len = 64 # 句子长度，长剪短补
batch_size = 128
learning_rate = 0.0001
epoches = 50
dropout = 0.5
num_classes = 6
embed_dim = 300
n_vocab = 0
import re
import os
import json
#import jieba
import pickle as pkl
import numpy as np
import gensim.models.word2vec as w2v
import torch
#from src.Config import Config
import torch.utils.data as Data
train_data_path = Config.train_data_path
test_data_path = Config.test_data_path
vocab_path = Config.vocab_path
label_fields = Config.label_fields
all_seq_len = Config.all_seq_len
UNK, PAD = '<UNK>', '<PAD>' # 未知字，padding符号
def build_vocab(content_list, tokenizer):
file_split_word = open(Config.split_word_all_path, 'w', encoding='utf-8')
vocab_dic = {}
for content in content_list:
word_lines = []
for word in tokenizer(content):
vocab_dic[word] = vocab_dic.get(word, 0) + 1
word_lines.append(word)
str = " ".join(word_lines) + "\n"
file_split_word.write(str)
file_split_word.close()
vocab_dic.update({UNK: len(vocab_dic), PAD: len(vocab_dic) + 1})
vocab_dic = {word_count: idx for idx, word_count in enumerate(vocab_dic)}
return vocab_dic
def build_id_vec(vocab_dic, model):
model.wv.add_vector(UNK, np.zeros(300))
model.wv.add_vector(PAD, np.ones(300))
id2vec = {}
for word in vocab_dic.keys():
id = vocab_dic.get(word, vocab_dic.get(UNK))
vec = model.wv.get_vector(word)
id2vec.update({id: vec})
return id2vec
def train_vec():
model_file_name = Config.model_file_name_path
sentences = w2v.LineSentence(Config.split_word_all_path)
model = w2v.Word2Vec(sentences, vector_size=300, window=20, min_count=0)
model.save(model_file_name)
def load_data(root):
content_list = []
content_token_list = []
label_list = []
if Config.word_level:
tokenizer = lambda x: [y for y in x]
else:
tokenizer = lambda x: jieba.cut(x, cut_all=False)
file = open(root, 'r', encoding='utf-8')
datas = json.load(file)
# pattern = re.compile(r'[^\u4e00-\u9fa5|，|。|！|？|\[|\]]')
pattern = re.compile(r'[^\u4e00-\u9fa5|，|。|！|？]')
# pattern = re.compile(r'[^\u4e00-\u9fa5|，|。]') # seq_len=32 CNN：67%-68% RNN：61%-62% Transformer：63-64%
# pattern = re.compile(r'[^\u4e00-\u9fa5|，|。|！]') # CNN：65%-66%
for data in datas:
content_after_clean = re.sub(pattern, '', data['content'])
content_list.append(content_after_clean)
label_list.append(label_fields[data['label']])
if os.path.exists(vocab_path):
vocab = pkl.load(open(vocab_path, 'rb'))
else:
vocab = build_vocab(content_list, tokenizer)
pkl.dump(vocab, open(vocab_path, 'wb'))
if Config.embedding_pretrained:
train_vec()
model = w2v.Word2Vec.load(Config.model_file_name_path)
id_vec = build_id_vec(vocab, model)
pkl.dump(id_vec, open(Config.id_vec_path, 'wb'))
for content in content_list:
word_line = []
token = list(tokenizer(content))
seq_len = len(token)
if seq_len < all_seq_len:
token.extend([PAD] * (all_seq_len - seq_len))
else:
token = token[:all_seq_len]
for word in token:
word_line.append(vocab.get(word, vocab.get(UNK)))
content_token_list.append(word_line)
n_vocab = len(vocab)
return content_token_list, label_list, n_vocab
class WeiBboDataset(Data.Dataset):
def __init__(self, content_token_list, label_list):
super(WeiBboDataset, self).__init__()
self.content_token_list = content_token_list
self.label_list = label_list
def __getitem__(self, index):
label = float(self.label_list[index])
return torch.tensor(self.content_token_list[index]), torch.tensor(label)
def __len__(self):
return len(self.label_list)
def get_data(batch_size):
train_content_token_list, train_label_list, n_vocab = load_data(train_data_path)
test_content_token_list, test_label_list, _ = load_data(test_data_path)
train_dataset = WeiBboDataset(train_content_token_list, train_label_list)
test_dataset = WeiBboDataset(test_content_token_list, test_label_list)
train_dataloader = Data.DataLoader(dataset=train_dataset, batch_size=batch_size, shuffle=True)
test_dataloader = Data.DataLoader(dataset=test_dataset, batch_size=batch_size, shuffle=False)
return train_dataloader, test_dataloader, n_vocab
if __name__ == '__main__':
get_data(32)
import os
import torch
import torch.nn as nn
from torch.autograd import Variable
#from utils.draw_loss_pic import draw_loss_pic
os.environ["KMP_DUPLICATE_LIB_OK"] = "TRUE"
def train(net, loss, optimizer, train_loader, test_loader, epoches, device):
train_loss = []
train_acc = []
test_loss = []
test_acc = []
for epoch in range(epoches):
net.train()
total_loss = 0.0
correct = 0
sample_num = 0
for batch_idx, (data, target) in enumerate(train_loader):
data = data.to(device).long()
target = target.to(device).long()
optimizer.zero_grad()
output = net(data)
ls = loss(output, target)
ls.backward()
optimizer.step()
total_loss += ls.item()
sample_num += len(target)
max_output = output.data.max(1, keepdim=True)[1].view_as(target)
correct += (max_output == target).sum()
print('epoch %d, train_loss %f, train_acc: %f' % (epoch + 1, total_loss/sample_num, float(correct.data.item()) / sample_num))
train_loss.append(total_loss/sample_num)
train_acc.append(float(correct.data.item()) / sample_num)
test_ls, test_accury = test(net, test_loader, device, loss)
test_loss.append(test_ls)
test_acc.append(test_accury)
draw_loss_pic(train_loss, test_loss, "loss")
draw_loss_pic(train_acc, test_acc, "acc")
def test(net, test_loader, device, loss):
net.eval()
total_loss = 0.0
correct = 0
sample_num = 0
for batch_idx, (data, target) in enumerate(test_loader):
data = data.to(device)
target = target.to(device).long()
output = net(data)
ls = loss(output, target)
total_loss += ls.item()
sample_num += len(target)
max_output = output.data.max(1, keepdim=True)[1].view_as(target)
correct += (max_output == target).sum()
print('test_loss %f, test_acc: %f' % (
total_loss / sample_num, float(correct.data.item()) / sample_num))
return total_loss / sample_num, float(correct.data.item()) / sample_num
import torch
import torch.nn as nn
import torch.optim as optim
import pickle as pkl
#from src.models.textCNN import TextCNN
#from src.models.textRNN import TextRNN
#from src.models.Transformer import Transformer
#from src.Config import Config
#from src.get_data import get_data
#from src.train import train
if __name__ == '__main__':
config = Config()
batch_size = config.batch_size
learning_rate = config.learning_rate
train_dataloader, test_dataloader, n_vocab = get_data(batch_size)
config.n_vocab = n_vocab
# model = TextCNN(config).to(Config.device)
model = TextRNN(config).to(Config.device)
# model = Transformer(config).to(Config.device)
# 导入word2vec训练出来的预训练词向量
id_vec = open(Config.id_vec_path, 'rb')
id_vec = pkl.load(id_vec)
id_vec = torch.tensor(list(id_vec.values())).to(Config.device)
if config.embedding_pretrained:
model.embedding = nn.Embedding.from_pretrained(id_vec)
loss = nn.CrossEntropyLoss().to(Config.device)
optimizer = optim.Adam(params=model.parameters(), lr=learning_rate)
train(model, loss, optimizer, train_dataloader, test_dataloader, Config.epoches, Config.device)
运行结果（准确率和错误率）：
正确率达到85%。
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