RuntimeError: Error(s) in loading state_dict for Wav2vec2Model: size mismatch for decoder.model.0.weight: copying a param with shape torch.Size([256, 512]) from checkpoint, the shape in current model is torch.Size([128, 512]). size mismatch for decoder.model.0.bias: copying a param with shape torch.Size([256]) from checkpoint, the shape in current model is torch.Size([128]). size mismatch for decoder.model.3.weight: copying a param with shape torch.Size([64, 256]) from checkpoint, the shape in current model is torch.Size([7, 128]). size mismatch for decoder.model.3.bias: copying a param with shape torch.Size([64]) from checkpoint, the shape in current model is torch.Size([7]).如何解决报错请举例
时间: 2023-12-10 08:36:59 浏览: 41
这个错误是由于在加载预训练模型的参数时,模型的某些层的维度和预训练模型的参数维度不匹配导致的。解决这个问题的方法是调整模型的参数维度,使其与预训练模型的参数维度相匹配。下面是一个简单的示例:
```python
import torch
class MyModel(torch.nn.Module):
def __init__(self):
super(MyModel, self).__init__()
self.encoder = torch.nn.Linear(512, 256)
self.decoder = torch.nn.Linear(256, 512)
def forward(self, x):
x = self.encoder(x)
x = self.decoder(x)
return x
model = MyModel()
pretrained_model = torch.load("pretrained_model.pth")
# 遍历预训练模型的参数,调整模型参数维度
for name, param in pretrained_model.items():
if name.startswith("decoder"):
if "weight" in name:
param = param[:256, :]
if "bias" in name:
param = param[:256]
model_dict = model.state_dict()
model_dict[name].copy_(param)
# 在此处使用模型进行推理或训练
```
在上面的示例中,我们首先定义了一个自定义模型MyModel,其中包含一个512维的输入层和一个512维的输出层。然后我们加载了一个名为“pretrained_model.pth”的预训练模型,并遍历了其所有的参数。对于decoder层的参数,我们将其维度调整为与自定义模型相匹配。最后,我们使用调整后的模型进行推理或训练。