embed_ind = torch.max(score, dim=1)[1]

This line of code uses PyTorch's max function to find the maximum value and its corresponding index along the second dimension of the input tensor "score". The resulting index tensor "embed_ind" contains the index of the maximum value for each row of "score". This is often used in classification tasks where the predicted class is chosen as the one with the highest score.

相关问题

embed_ind = torch.max(score, dim=1)

This line of code finds the maximum value and corresponding index along the second dimension (dim=1) of the tensor "score". The resulting "embed_ind" tensor contains the indices of the maximum values for each row in the "score" tensor.

RuntimeError: element 0 of tensors does not require grad and does not have a grad_fn class CustomLoss(nn.Module): def __init__(self): super(CustomLoss, self).__init__() def forward(self, predicted_tokens, target_tokens): # 设置predicted_tokens为需要梯度计算的张量 scores = torch.zeros_like(target_tokens, dtype=torch.float32) for i in range(target_tokens.size(1)): target_token = target_tokens[:, i] max_score = torch.max(torch.eq(predicted_tokens, target_token.unsqueeze(dim=1)).float(), dim=1)[0] scores[:, i] = max_score loss = 1 - torch.mean(scores) return loss class QABasedOnAttentionModel(nn.Module): def __init__(self, vocab_size, embed_size, hidden_size, topk): super(QABasedOnAttentionModel, self).__init__() self.topk = topk self.embedding = nn.Embedding(vocab_size, embed_size) self.encoder = nn.GRU(embed_size, hidden_size, batch_first=True) self.attention = nn.Linear(hidden_size, 1) self.decoder = nn.Linear(hidden_size, topk) def forward(self, input_question, input_answer): question_embed = self.embedding(input_question) answer_embed = self.embedding(input_answer) _, question_hidden = self.encoder(question_embed) answer_outputs, _ = self.encoder(answer_embed, question_hidden) attention_weights = self.attention(answer_outputs).squeeze(dim=-1) attention_weights = torch.softmax(attention_weights, dim=1) context_vector = torch.bmm(attention_weights.unsqueeze(dim=1), answer_outputs).squeeze(dim=1) logits = self.decoder(context_vector) return logits

根据你提供的代码，我看不到明显的问题。这个错误通常发生在尝试对不需要梯度的张量进行反向传播时。

如果你确定错误出现在这段代码中，那么可能是在调用`backward()`方法之前，还有其他地方出现了问题。请确保没有在其他地方对该张量进行了操作，使其不再需要梯度。你可以检查一下是否在模型的其他部分或损失函数中使用了`detach()`或`data`等操作，这些操作都会导致张量不再需要梯度。

另外，你可以尝试将`CustomLoss`类中的`forward()`方法的参数也设置为需要梯度计算的张量：

def forward(self, predicted_tokens, target_tokens):
    predicted_tokens.requires_grad_()
    ...

这样可以确保`predicted_tokens`是需要梯度计算的张量。

如果以上方法仍然没有解决问题，那么可能是其他部分的代码引起了错误。请提供更多的上下文或详细的错误信息，以便我能更好地帮助你解决问题。