帮我用pytorch写一段CNN和GRU结合的网络模型代码，输入时.csv文件

当您提到输入是.csv文件时，我假设您的.csv文件包含文本数据。在这种情况下，您需要将文本数据加载到PyTorch模型中。以下是一个示例代码，用于将.csv文件中的文本数据加载到CNN和GRU结合的网络模型中：

import pandas as pd
import torch
import torch.nn as nn
import torch.optim as optim
from torch.utils.data import Dataset, DataLoader
from sklearn.feature_extraction.text import CountVectorizer

# 自定义数据集类
class CustomDataset(Dataset):
    def __init__(self, csv_file, vectorizer):
        self.data = pd.read_csv(csv_file)
        self.vectorizer = vectorizer
        
    def __len__(self):
        return len(self.data)
    
    def __getitem__(self, idx):
        text = self.data.iloc[idx]['text']
        label = self.data.iloc[idx]['label']
        vectorized_text = self.vectorizer.transform([text]).toarray().squeeze()
        return vectorized_text, label

# 自定义CNN-GRU模型类
class CNN_GRU_Model(nn.Module):
    def __init__(self, input_dim, hidden_dim, output_dim, num_filters, filter_sizes, dropout):
        super(CNN_GRU_Model, self).__init__()
        
        # Convolutional layers
        self.convs = nn.ModuleList([
            nn.Conv2d(in_channels=1,
                      out_channels=num_filters,
                      kernel_size=(fs, input_dim))
            for fs in filter_sizes
        ])
        
        # GRU layer
        self.gru = nn.GRU(input_dim*num_filters, hidden_dim)
        
        # Dropout layer
        self.dropout = nn.Dropout(dropout)
        
        # Fully-connected layer
        self.fc = nn.Linear(hidden_dim, output_dim)
        
    def forward(self, text):
        # text shape: (batch_size, input_dim)
        
        text = text.unsqueeze(1)
        # text shape: (batch_size, 1, input_dim)
        
        conved = [F.relu(conv(text)).squeeze(3) for conv in self.convs]
        # conved[i] shape: (batch_size, num_filters, input_dim - filter_sizes[i] + 1)
        
        pooled = [F.max_pool1d(conv, conv.shape[2]).squeeze(2) for conv in conved]
        # pooled[i] shape: (batch_size, num_filters)
        
        cat = self.dropout(torch.cat(pooled, dim=1))
        # cat shape: (batch_size, num_filters * len(filter_sizes))
        
        _, hidden = self.gru(cat.unsqueeze(0))
        # hidden shape: (1, batch_size, hidden_dim)
        
        hidden = self.dropout(hidden.squeeze(0))
        # hidden shape: (batch_size, hidden_dim)
        
        output = self.fc(hidden)
        # output shape: (batch_size, output_dim)
        
        return output

# 加载数据
csv_file = 'your_data.csv'
data = pd.read_csv(csv_file)

# 创建文本向量化器
vectorizer = CountVectorizer()
vectorizer.fit(data['text'])

# 创建自定义数据集
dataset = CustomDataset(csv_file, vectorizer)

# 设置超参数
input_dim = len(vectorizer.get_feature_names())
hidden_dim = 100
output_dim = 2
num_filters = 100
filter_sizes = [3, 4, 5]
dropout = 0.5

# 创建CNN-GRU模型实例
model = CNN_GRU_Model(input_dim, hidden_dim, output_dim, num_filters, filter_sizes, dropout)

# 定义损失函数和优化器
criterion = nn.CrossEntropyLoss()
optimizer = optim.Adam(model.parameters(), lr=0.001)

# 创建数据加载器
dataloader = DataLoader(dataset, batch_size=32, shuffle=True)

# 训练模型
for epoch in range(10):
    running_loss = 0.0
    for inputs, labels in dataloader:
        optimizer.zero_grad()
        outputs = model(inputs)
        loss = criterion(outputs, labels)
        loss.backward()
        optimizer.step()
        running_loss += loss.item()
        
    print(f"Epoch {epoch+1} Loss: {running_loss/len(dataloader)}")

请注意，上述代码仅提供了一个基本的框架，您可能需要根据您的具体数据和任务进行适当的修改。在这个示例中，我们使用了一个简单的文本向量化器（CountVectorizer）将文本转换为向量表示，然后使用自定义数据集类将数据加载到模型中。您可以调整超参数、网络结构和训练过程来满足您的需求。