w1 = torch.randn(D_input, D_hidden).type(dtype)
时间: 2024-05-24 17:11:03 浏览: 11
This line of code initializes a tensor `w1` with random values drawn from a normal distribution with a mean of 0 and standard deviation of 1. The tensor has dimensions `D_input` by `D_hidden`, where `D_input` is the number of input units and `D_hidden` is the number of hidden units in the neural network. The tensor is of type `dtype`, which is a variable that specifies the data type of the tensor (e.g., float32 or float64).
相关问题
def forward(self, input_question, input_answer): input_question.requires_grad = True question_embed = torch.nn.Parameter(self.embedding(input_question), requires_grad=True) answer_embed = torch.nn.Parameter(self.embedding(input_answer), requires_grad=True) _, 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
在你的代码中,你已经正确地将`input_question`和`input_answer`设置为需要梯度计算的张量。
然而,在使用`torch.nn.Parameter`时,你不需要再次设置`requires_grad=True`,因为`torch.nn.Parameter`默认会将其设置为True。
另外,在计算attention权重时,你可以使用`torch.softmax`函数来对attention权重进行归一化,而不是使用`torch.sigmoid`。softmax函数将确保所有权重的总和为1。
对于logits的计算,没有发现明显的问题。
总的来说,修改后的代码如下所示:
```python
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
```
请确保在使用`loss.backward()`之前,所有需要梯度计算的张量都设置了`requires_grad=True`。如果仍然遇到问题,请检查其他部分的代码是否正确设置了梯度属性。
这段代码哪里错了 class my_BiGRU(torch.nn.Module): def __init__(self, input_size, hidden_size, num_layers, output_size, gru_dropout): super(my_BiGRU, self).__init__() self.input_size = input_size self.hidden_size = hidden_size self.num_layers = num_layers self.output_size = output_size self.gru_dropout = gru_dropout self.gru = torch.nn.GRU(input_size, hidden_size, num_layers=num_layers, batch_first=True, bidirectional=True) self.fc = torch.nn.Linear(hidden_size * 2, output_size) def _setup_BiGRU_layers(self): self.BiGRU_layers = my_BiGRU(input_size=self.args.capsule_out_dim, output_size=self.args.apsule_out_features, hidden_size=self.args.BiGRU_hiddensize, num_layers=self.args.BiGRU_layers, gru_dropout=self.args.BiGRU_dropout, )
这段代码存在两个问题:
1.函数 `_setup_BiGRU_layers` 中的代码应该是在类的构造函数 `__init__` 中进行初始化,而不是在另外一个函数中进行初始化。
2.在调用 `my_BiGRU` 类时,参数名称有误,应该将 `apsule_out_features` 改为 `capsule_out_features`。
改正后的代码如下所示:
```
class my_BiGRU(torch.nn.Module):
def __init__(self, input_size, hidden_size, num_layers, output_size, gru_dropout, capsule_out_features):
super(my_BiGRU, self).__init__()
self.input_size = input_size
self.hidden_size = hidden_size
self.num_layers = num_layers
self.output_size = output_size
self.gru_dropout = gru_dropout
self.gru = torch.nn.GRU(input_size, hidden_size, num_layers=num_layers, batch_first=True, bidirectional=True)
self.fc = torch.nn.Linear(hidden_size * 2, output_size)
self.BiGRU_layers = my_BiGRU(input_size=self.input_size,
output_size=capsule_out_features,
hidden_size=self.hidden_size,
num_layers=self.num_layers,
gru_dropout=self.gru_dropout,
)
```
注意:这里假设 `capsule_out_dim` 和 `args` 都已经在代码中被定义好了。
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