帮我写一段基于pytorch的nn.transformerencoder初始化代码

好的，以下是基于 PyTorch 的 nn.transformerencoder 初始化代码：

import torch.nn as nn
import torch.nn.functional as F

class TransformerEncoder(nn.Module):
    def __init__(self, num_layers, d_model, nhead, dim_feedforward, dropout=.1):
        super(TransformerEncoder, self).__init__()

        encoder_layer = nn.TransformerEncoderLayer(d_model=d_model, nhead=nhead, dim_feedforward=dim_feedforward, dropout=dropout)
        self.transformer_encoder = nn.TransformerEncoder(encoder_layer, num_layers=num_layers)

    def forward(self, src):
        src = src.permute(1, , 2)
        output = self.transformer_encoder(src)
        output = output.permute(1, , 2)
        return output

希望能对您有所帮助。