#|新闻主题分类任务——torchtext 库进行文本分类深度学习|机器学习|torchtext|自

简介
导入相关的torch工具包
访问原始数据集迭代器
使用原始训练数据集构建词汇表
生成数据批处理和迭代器
定义模型
定义函数来训练模型和评估结果
实例化并运行模型
使用测试数据集评估模型
测试随机新闻
完整代码
参考链接

简介使用浅层网络构建新闻主题分类器。
以一段新闻报道中的文本描述内容为输入, 使用模型帮助我们判断它最有可能属于哪一种类型的新闻, 这是典型的文本分类问题, 我们这里假定每种类型是互斥的, 即文本描述有且只有一种类型。
导入相关的torch工具包

import timeimport torch import torch.nn as nn from torchtext.datasets import AG_NEWS from torchtext.data.utils import get_tokenizer from torchtext.vocab import build_vocab_from_iterator from torch.utils.data import DataLoader from torch.utils.data.dataset import random_split from torchtext.data.functional import to_map_style_dataset from TextClassificationModule import TextClassificationModule

访问原始数据集迭代器 torchtext 库提供了一些原始数据集迭代器，它们产生原始文本字符串。例如，AG_NEWS数据集迭代器将原始数据生成为标签和文本的元组。

# 可用设备检测, 有GPU的话将优先使用GPU device = torch.device("cuda" if torch.cuda.is_available() else "cpu") # 基本的英文分词器 tokenizer = get_tokenizer('basic_english') # 训练数据加载器 train_iter = AG_NEWS(split="train") test_iter = AG_NEWS(split="test")

对读取到的数据进行测试，该读取的数据是从网上自动下载到缓存，其中读取到的 train_iter 和 test_iter 为训练集和测试集，且均为迭代器类型。

print('test:') train_data = https://www.it610.com/article/iter(train_iter) test_data = iter(test_iter) print(next(train_data)) print(next(test_data))

运行结果

test: (3, "Wall St. Bears Claw Back Into the Black (Reuters) Reuters - Short-sellers, Wall Street's dwindling\\band of ultra-cynics, are seeing green again.") (3, "Fears for T N pension after talks Unions representing workers at TurnerNewall say they are 'disappointed' after talks with stricken parent firm Federal Mogul.")

使用原始训练数据集构建词汇表其中分词生成器中的 “_” 表示一个不用的变量即类别，text 表示新闻文本，如：
_ = 3

text = Wall St. Bears Claw Back Into the Black (Reuters) Reuters - Short-sellers, Wall Street's dwindling\\band of ultra-cynics, are seeing green again.

python 中 yield 的作用就是把一个函数变成一个 generator，带有 yield 的函数不再是一个普通函数，Python 解释器会将其视为一个 generator，调用 fab(5) 不会执行 fab 函数，而是返回一个 iterable 对象。
示例

def yield_test(n): for i in range(n): yield call(i) print("i=",i) #做一些其它的事情 print("do something.") print("end.")def call(i): return i*2#使用for循环 for i in yield_test(5): print(i,",")

运行结果

0 , i= 0 2 , i= 1 4 , i= 2 6 , i= 3 8 , i= 4 do something. end.

使用原始训练数据集构建词汇表

# 分词生成器 def yield_tokens(data_iter): for _, text in data_iter: yield tokenizer(text)# 根据训练数据构建词汇表，torchtext.vocab vocab = build_vocab_from_iterator(yield_tokens(train_iter), specials=[""]) # 设置默认索引，当某个单词不在词汇表 vocab 时（OOV)，返回该单词索引 vocab.set_default_index(vocab[""])# 词汇表会将 token 映射到词汇表中的索引上 print(vocab(["here", "is", "an", "example"]))# 构建数据加载器 dataloader # text_pipeline 将一个文本字符串转换为整数 List, List 中每项对应词汇表 vocab 中的单词的索引号 text_pipeline = lambda x: vocab(tokenizer(x))# label_pipeline 将 label 转换为整数 label_pipeline = lambda x: int(x) - 1# pipeline example print(text_pipeline("hello world! I'am happy")) print(label_pipeline("10"))

运行结果

[475, 21, 30, 5297] [12544, 50, 764, 282, 16, 1913, 2734] 9

生成数据批处理和迭代器

def collate_batch(batch): label_list, text_list, offsets = [], [], [0] for (_label, _text) in batch: label_list.append(label_pipeline(_label)) processed_text = torch.tensor(text_pipeline(_text), dtype=torch.int64) text_list.append(processed_text) offsets.append(processed_text.size(0)) label_list = torch.tensor(label_list, dtype=torch.int64) offsets = torch.tensor(offsets[:-1]).cumsum(dim=0) text_list = torch.cat(text_list) return label_list.to(device), text_list.to(device), offsets.to(device)# 加载数据集合，转换为张量 dataloader = DataLoader(train_iter, batch_size=8, shuffle=False, collate_fn=collate_batch)

定义模型该模型由 nn.EmbeddingBag 层和用于分类目的的线性层组成。nn.EmbeddingBag 使用默认模式“mean”计算嵌入“bag”的平均值。尽管此处的文本条目具有不同的长度，但 nn.EmbeddingBag 模块在此处不需要填充，因为文本长度保存在偏移量中。
nn.EmbeddingBag 可以提高性能和内存效率以处理一系列张量。

import torch.nn as nnclass TextClassificationModule(nn.Module): def __init__(self, vocab_size, embed_dim, num_class): """ 文本分类模型 description: 类的初始化函数 :param vocab_size: 整个语料包含的不同词汇总数 :param embed_dim: 指定词嵌入的维度 :param num_class: 文本分类的类别总数 """ super(TextClassificationModule, self).__init__() # 实例化embedding层, sparse=True代表每次对该层求解梯度时, 只更新部分权重 self.embedding = nn.EmbeddingBag(vocab_size, embed_dim, sparse=True) # 实例化全连接层, 参数分别是embed_dim和num_class self.fc = nn.Linear(embed_dim, num_class) # 为各层初始化权重 self.init_weights()def init_weights(self): """初始化权重函数""" # 指定初始权重的取值范围数 initrange = 0.5 # 各层的权重参数都是初始化为均匀分布 self.embedding.weight.data.uniform_(-initrange, initrange) self.fc.weight.data.uniform_(-initrange, initrange) # 偏置初始化为0 self.fc.bias.data.zero_()def forward(self, text, offsets): """ :param text: 文本数值映射后的结果 :return: 与类别数尺寸相同的张量, 用以判断文本类别 """ embedded = self.embedding(text, offsets) return self.fc(embedded)

定义函数来训练模型和评估结果

def train(dataloader): model.train() total_acc, total_count = 0, 0 log_interval = 500 start_time = time.time() for idx, (label, text, offsets) in enumerate(dataloader): optimizer.zero_grad() predicted_label = model(text, offsets) loss = criterion(predicted_label, label) loss.backward() torch.nn.utils.clip_grad_norm_(model.parameters(), 0.1) optimizer.step() total_acc += (predicted_label.argmax(1) == label).sum().item() total_count += label.size(0) if idx % log_interval == 0 and idx > 0: elapsed = time.time() - start_time print('| epoch {:3d} | {:5d}/{:5d} batches ' '| accuracy {:8.3f}'.format(epoch, idx, len(dataloader), total_acc / total_count)) total_acc, total_count = 0, 0 start_time = time.time()def evaluate(dataloader): model.eval() total_acc, total_count = 0, 0with torch.no_grad(): for idx, (label, text, offsets) in enumerate(dataloader): predicted_label = model(text, offsets) loss = criterion(predicted_label, label) total_acc += (predicted_label.argmax(1) == label).sum().item() total_count += label.size(0) return total_acc / total_count

实例化并运行模型

# 加载数据集合，转换为张量 dataloader = DataLoader(train_iter, batch_size=8, shuffle=False, collate_fn=collate_batch) # 一个嵌入维度为 64 的模型。词汇大小等于词汇实例的长度。类的数量等于标签的数量， num_class = len(set([label for (label, text) in train_iter])) vocab_size = len(vocab) emsize = 64 model = TextClassificationModule(vocab_size, emsize, num_class).to(device)# 训练轮数 EPOCHS = 10 # 学习率 LR = 5 # 训练数据规模 BATCH_SIZE = 64 # 交叉熵损失函数 criterion = torch.nn.CrossEntropyLoss() # 优化器 optimizer = torch.optim.SGD(model.parameters(), lr=LR) # 调整学习率机制 scheduler = torch.optim.lr_scheduler.StepLR(optimizer, 1, gamma=0.1) total_accu = None train_dataset = to_map_style_dataset(train_iter) test_dataset = to_map_style_dataset(test_iter) # 划分训练集中5%的数据最为验证集 num_train = int(len(train_dataset) * 0.95) split_train_, split_valid_ = random_split(train_dataset, [num_train, len(train_dataset) - num_train])train_dataloader = DataLoader(split_train_, batch_size=BATCH_SIZE, shuffle=True, collate_fn=collate_batch) valid_dataloader = DataLoader(split_valid_, batch_size=BATCH_SIZE, shuffle=True, collate_fn=collate_batch) test_dataloader = DataLoader(test_dataset, batch_size=BATCH_SIZE, shuffle=True, collate_fn=collate_batch)for epoch in range(1, EPOCHS + 1): epoch_start_time = time.time() train(train_dataloader) accu_val = evaluate(valid_dataloader) if total_accu is not None and total_accu > accu_val: scheduler.step() else: total_accu = accu_val print('-' * 59) print('| end of epoch {:3d} | time: {:5.2f}s | ' 'valid accuracy {:8.3f} '.format(epoch, time.time() - epoch_start_time, accu_val)) print('-' * 59)

运行结果

| epoch1 |500/ 1782 batches | accuracy0.689 | epoch1 |1000/ 1782 batches | accuracy0.856 | epoch1 |1500/ 1782 batches | accuracy0.873 ----------------------------------------------------------- | end of epoch1 | time: 23.38s | valid accuracy0.879 ----------------------------------------------------------- | epoch2 |500/ 1782 batches | accuracy0.896 | epoch2 |1000/ 1782 batches | accuracy0.904 | epoch2 |1500/ 1782 batches | accuracy0.900 ----------------------------------------------------------- | end of epoch2 | time: 32.21s | valid accuracy0.891 ----------------------------------------------------------- | epoch3 |500/ 1782 batches | accuracy0.915 | epoch3 |1000/ 1782 batches | accuracy0.916 | epoch3 |1500/ 1782 batches | accuracy0.915 ----------------------------------------------------------- | end of epoch3 | time: 36.85s | valid accuracy0.899 ----------------------------------------------------------- | epoch4 |500/ 1782 batches | accuracy0.925 | epoch4 |1000/ 1782 batches | accuracy0.925 | epoch4 |1500/ 1782 batches | accuracy0.922 ----------------------------------------------------------- | end of epoch4 | time: 20.15s | valid accuracy0.897 ----------------------------------------------------------- | epoch5 |500/ 1782 batches | accuracy0.937 | epoch5 |1000/ 1782 batches | accuracy0.938 | epoch5 |1500/ 1782 batches | accuracy0.936 ----------------------------------------------------------- | end of epoch5 | time: 28.52s | valid accuracy0.905 ----------------------------------------------------------- | epoch6 |500/ 1782 batches | accuracy0.939 | epoch6 |1000/ 1782 batches | accuracy0.938 | epoch6 |1500/ 1782 batches | accuracy0.941 ----------------------------------------------------------- | end of epoch6 | time: 33.47s | valid accuracy0.905 ----------------------------------------------------------- | epoch7 |500/ 1782 batches | accuracy0.940 | epoch7 |1000/ 1782 batches | accuracy0.941 | epoch7 |1500/ 1782 batches | accuracy0.939 ----------------------------------------------------------- | end of epoch7 | time: 20.75s | valid accuracy0.904 ----------------------------------------------------------- | epoch8 |500/ 1782 batches | accuracy0.941 | epoch8 |1000/ 1782 batches | accuracy0.941 | epoch8 |1500/ 1782 batches | accuracy0.940 ----------------------------------------------------------- | end of epoch8 | time: 27.11s | valid accuracy0.906 ----------------------------------------------------------- | epoch9 |500/ 1782 batches | accuracy0.942 | epoch9 |1000/ 1782 batches | accuracy0.942 | epoch9 |1500/ 1782 batches | accuracy0.942 ----------------------------------------------------------- | end of epoch9 | time: 34.83s | valid accuracy0.906 ----------------------------------------------------------- | epoch10 |500/ 1782 batches | accuracy0.942 | epoch10 |1000/ 1782 batches | accuracy0.942 | epoch10 |1500/ 1782 batches | accuracy0.940 ----------------------------------------------------------- | end of epoch10 | time: 22.78s | valid accuracy0.906 -----------------------------------------------------------

使用测试数据集评估模型

print('Checking the results of test dataset.') accu_test = evaluate(test_dataloader) print('test accuracy {:8.3f}'.format(accu_test))

运行结果

Checking the results of test dataset. test accuracy0.906

测试随机新闻

# 测试随机新闻 # 使用迄今为止最好的模型并测试高尔夫新闻。 ag_news_label = {1: "World", 2: "Sports", 3: "Business", 4: "Sci/Tec"}def predict(text, text_pipeline): with torch.no_grad(): text = torch.tensor(text_pipeline(text)) output = model(text, torch.tensor([0])) return output.argmax(1).item() + 1ex_text_str = "MEMPHIS, Tenn. – Four days ago, Jon Rahm was \ enduring the season’s worst weather conditions on Sunday at The \ Open on his way to a closing 75 at Royal Portrush, which \ considering the wind and the rain was a respectable showing. \ Thursday’s first round at the WGC-FedEx St. Jude Invitational \ was another story. With temperatures in the mid-80s and hardly any \ wind, the Spaniard was 13 strokes better in a flawless round. \ Thanks to his best putting performance on the PGA Tour, Rahm \ finished with an 8-under 62 for a three-stroke lead, which \ was even more impressive considering he’d never played the \ front nine at TPC Southwind."model = model.to("cpu")print("This is a %s news" % ag_news_label[predict(ex_text_str, text_pipeline)])

运行结果

This is a Sports news

完整代码

import timeimport torch import torch.nn as nn from torchtext.datasets import AG_NEWS from torchtext.data.utils import get_tokenizer from torchtext.vocab import build_vocab_from_iterator from torch.utils.data import DataLoader from torch.utils.data.dataset import random_split from torchtext.data.functional import to_map_style_dataset# 可用设备检测, 有GPU的话将优先使用GPU device = torch.device("cuda" if torch.cuda.is_available() else "cpu") # 基本的英文分词器 tokenizer = get_tokenizer('basic_english') # 训练数据加载器 train_iter = AG_NEWS(split="train") test_iter = AG_NEWS(split="test")# print('test:') # train_data = https://www.it610.com/article/iter(train_iter) # test_data = iter(test_iter) # print(next(train_data)) # print(next(test_data))# 分词生成器 def yield_tokens(data_iter): for _, text in data_iter: yield tokenizer(text)# 根据训练数据构建词汇表 vocab = build_vocab_from_iterator(yield_tokens(train_iter), specials=[""]) # 设置默认索引，当某个单词不在词汇表 vocab 时（OOV)，返回该单词索引 vocab.set_default_index(vocab[""])# 词汇表会将 token 映射到词汇表中的索引上 # print(vocab(["here", "is", "an", "example"]))# 构建数据加载器 dataloader # text_pipeline 将一个文本字符串转换为整数 List, List 中每项对应词汇表 vocab 中的单词的索引号 text_pipeline = lambda x: vocab(tokenizer(x))# label_pipeline 将 label 转换为整数 label_pipeline = lambda x: int(x) - 1# pipeline example # print(text_pipeline("hello world! I'am happy")) # print(label_pipeline("10"))# 模型 class TextClassificationModule(nn.Module): def __init__(self, vocab_size, embed_dim, num_class): """ 文本分类模型 description: 类的初始化函数 :param vocab_size: 整个语料包含的不同词汇总数 :param embed_dim: 指定词嵌入的维度 :param num_class: 文本分类的类别总数 """ super(TextClassificationModule, self).__init__() # 实例化embedding层, sparse=True代表每次对该层求解梯度时, 只更新部分权重 self.embedding = nn.EmbeddingBag(vocab_size, embed_dim, sparse=True) # 实例化全连接层, 参数分别是embed_dim和num_class self.fc = nn.Linear(embed_dim, num_class) # 为各层初始化权重 self.init_weights()def init_weights(self): """初始化权重函数""" # 指定初始权重的取值范围数 initrange = 0.5 # 各层的权重参数都是初始化为均匀分布 self.embedding.weight.data.uniform_(-initrange, initrange) self.fc.weight.data.uniform_(-initrange, initrange) # 偏置初始化为0 self.fc.bias.data.zero_()def forward(self, text, offsets): """ :param text: 文本数值映射后的结果 :return: 与类别数尺寸相同的张量, 用以判断文本类别 """ embedded = self.embedding(text, offsets) return self.fc(embedded)def collate_batch(batch): label_list, text_list, offsets = [], [], [0] for (_label, _text) in batch: label_list.append(label_pipeline(_label)) processed_text = torch.tensor(text_pipeline(_text), dtype=torch.int64) text_list.append(processed_text) offsets.append(processed_text.size(0)) label_list = torch.tensor(label_list, dtype=torch.int64) offsets = torch.tensor(offsets[:-1]).cumsum(dim=0) text_list = torch.cat(text_list) return label_list.to(device), text_list.to(device), offsets.to(device)def train(dataloader): model.train() total_acc, total_count = 0, 0 log_interval = 500 start_time = time.time() for idx, (label, text, offsets) in enumerate(dataloader): optimizer.zero_grad() predicted_label = model(text, offsets) loss = criterion(predicted_label, label) loss.backward() torch.nn.utils.clip_grad_norm_(model.parameters(), 0.1) optimizer.step() total_acc += (predicted_label.argmax(1) == label).sum().item() total_count += label.size(0) if idx % log_interval == 0 and idx > 0: elapsed = time.time() - start_time print('| epoch {:3d} | {:5d}/{:5d} batches ' '| accuracy {:8.3f}'.format(epoch, idx, len(dataloader), total_acc / total_count)) total_acc, total_count = 0, 0 start_time = time.time()def evaluate(dataloader): model.eval() total_acc, total_count = 0, 0with torch.no_grad(): for idx, (label, text, offsets) in enumerate(dataloader): predicted_label = model(text, offsets) loss = criterion(predicted_label, label) total_acc += (predicted_label.argmax(1) == label).sum().item() total_count += label.size(0) return total_acc / total_count# 加载数据集合，转换为张量 dataloader = DataLoader(train_iter, batch_size=8, shuffle=False, collate_fn=collate_batch) # 一个嵌入维度为 64 的模型。词汇大小等于词汇实例的长度。类的数量等于标签的数量， num_class = len(set([label for (label, text) in train_iter])) vocab_size = len(vocab) emsize = 64 model = TextClassificationModule(vocab_size, emsize, num_class).to(device)# 训练轮数 EPOCHS = 10 # 学习率 LR = 5 # 训练数据规模 BATCH_SIZE = 64 # 交叉熵损失函数 criterion = torch.nn.CrossEntropyLoss() # 优化器 optimizer = torch.optim.SGD(model.parameters(), lr=LR) # 调整学习率机制 scheduler = torch.optim.lr_scheduler.StepLR(optimizer, 1, gamma=0.1) total_accu = None train_dataset = to_map_style_dataset(train_iter) test_dataset = to_map_style_dataset(test_iter)# 划分训练集中5%的数据最为验证集 num_train = int(len(train_dataset) * 0.95) split_train_, split_valid_ = random_split(train_dataset, [num_train, len(train_dataset) - num_train])train_dataloader = DataLoader(split_train_, batch_size=BATCH_SIZE, shuffle=True, collate_fn=collate_batch) valid_dataloader = DataLoader(split_valid_, batch_size=BATCH_SIZE, shuffle=True, collate_fn=collate_batch) test_dataloader = DataLoader(test_dataset, batch_size=BATCH_SIZE, shuffle=True, collate_fn=collate_batch)for epoch in range(1, EPOCHS + 1): epoch_start_time = time.time() train(train_dataloader) accu_val = evaluate(valid_dataloader) if total_accu is not None and total_accu > accu_val: scheduler.step() else: total_accu = accu_val print('-' * 59) print('| end of epoch {:3d} | time: {:5.2f}s | ' 'valid accuracy {:8.3f} '.format(epoch, time.time() - epoch_start_time, accu_val)) print('-' * 59)'''使用测试数据集评估模型''' print('Checking the results of test dataset.') accu_test = evaluate(test_dataloader) print('test accuracy {:8.3f}'.format(accu_test))# 测试随机新闻 # 使用迄今为止最好的模型并测试高尔夫新闻。 ag_news_label = {1: "World", 2: "Sports", 3: "Business", 4: "Sci/Tec"}def predict(text, text_pipeline): with torch.no_grad(): text = torch.tensor(text_pipeline(text)) output = model(text, torch.tensor([0])) return output.argmax(1).item() + 1ex_text_str = "MEMPHIS, Tenn. – Four days ago, Jon Rahm was \ enduring the season’s worst weather conditions on Sunday at The \ Open on his way to a closing 75 at Royal Portrush, which \ considering the wind and the rain was a respectable showing. \ Thursday’s first round at the WGC-FedEx St. Jude Invitational \ was another story. With temperatures in the mid-80s and hardly any \ wind, the Spaniard was 13 strokes better in a flawless round. \ Thanks to his best putting performance on the PGA Tour, Rahm \ finished with an 8-under 62 for a three-stroke lead, which \ was even more impressive considering he’d never played the \ front nine at TPC Southwind."model = model.to("cpu")print("This is a %s news" % ag_news_label[predict(ex_text_str, text_pipeline)])

运行结果

| epoch1 |500/ 1782 batches | accuracy0.689 | epoch1 |1000/ 1782 batches | accuracy0.856 | epoch1 |1500/ 1782 batches | accuracy0.873 ----------------------------------------------------------- | end of epoch1 | time: 23.38s | valid accuracy0.879 ----------------------------------------------------------- | epoch2 |500/ 1782 batches | accuracy0.896 | epoch2 |1000/ 1782 batches | accuracy0.904 | epoch2 |1500/ 1782 batches | accuracy0.900 ----------------------------------------------------------- | end of epoch2 | time: 32.21s | valid accuracy0.891 ----------------------------------------------------------- | epoch3 |500/ 1782 batches | accuracy0.915 | epoch3 |1000/ 1782 batches | accuracy0.916 | epoch3 |1500/ 1782 batches | accuracy0.915 ----------------------------------------------------------- | end of epoch3 | time: 36.85s | valid accuracy0.899 ----------------------------------------------------------- | epoch4 |500/ 1782 batches | accuracy0.925 | epoch4 |1000/ 1782 batches | accuracy0.925 | epoch4 |1500/ 1782 batches | accuracy0.922 ----------------------------------------------------------- | end of epoch4 | time: 20.15s | valid accuracy0.897 ----------------------------------------------------------- | epoch5 |500/ 1782 batches | accuracy0.937 | epoch5 |1000/ 1782 batches | accuracy0.938 | epoch5 |1500/ 1782 batches | accuracy0.936 ----------------------------------------------------------- | end of epoch5 | time: 28.52s | valid accuracy0.905 ----------------------------------------------------------- | epoch6 |500/ 1782 batches | accuracy0.939 | epoch6 |1000/ 1782 batches | accuracy0.938 | epoch6 |1500/ 1782 batches | accuracy0.941 ----------------------------------------------------------- | end of epoch6 | time: 33.47s | valid accuracy0.905 ----------------------------------------------------------- | epoch7 |500/ 1782 batches | accuracy0.940 | epoch7 |1000/ 1782 batches | accuracy0.941 | epoch7 |1500/ 1782 batches | accuracy0.939 ----------------------------------------------------------- | end of epoch7 | time: 20.75s | valid accuracy0.904 ----------------------------------------------------------- | epoch8 |500/ 1782 batches | accuracy0.941 | epoch8 |1000/ 1782 batches | accuracy0.941 | epoch8 |1500/ 1782 batches | accuracy0.940 ----------------------------------------------------------- | end of epoch8 | time: 27.11s | valid accuracy0.906 ----------------------------------------------------------- | epoch9 |500/ 1782 batches | accuracy0.942 | epoch9 |1000/ 1782 batches | accuracy0.942 | epoch9 |1500/ 1782 batches | accuracy0.942 ----------------------------------------------------------- | end of epoch9 | time: 34.83s | valid accuracy0.906 ----------------------------------------------------------- | epoch10 |500/ 1782 batches | accuracy0.942 | epoch10 |1000/ 1782 batches | accuracy0.942 | epoch10 |1500/ 1782 batches | accuracy0.940 ----------------------------------------------------------- | end of epoch10 | time: 22.78s | valid accuracy0.906 ----------------------------------------------------------- Checking the results of test dataset. test accuracy0.906 This is a Sports newsProcess finished with exit code 0

参考链接 【#|新闻主题分类任务——torchtext 库进行文本分类】https://pytorch.org/tutorials/beginner/text_sentiment_ngrams_tutorial.html