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网页设计的步骤有哪些,广州seo推广,8个页面的网站怎么做,如何修改wordpress的语言self.register_buffer就是pytorch框架用来保存不更新参数的方法。 列子如下: self.register_buffer("position_emb", torch.randn((5, 3)))第一个参数position_emb传入一个字符串,表示这组参数的名字,第二个就是tensor形式的参数…

self.register_buffer就是pytorch框架用来保存不更新参数的方法。

列子如下:

self.register_buffer("position_emb", torch.randn((5, 3)))

第一个参数position_emb传入一个字符串,表示这组参数的名字,第二个就是tensor形式的参数torch.randn((5, 3),并一次初始化后保存于模型,不会有梯度传播给它,能被模型的model.state_dict()记录下来,可以理解为模型的常数。当然,你想保留固定值,使用如下代码:

self.register_buffer("position_emb", torch.tensorrt([[2,5],[8,9]]))

进一步探讨训练对该参数是否有影响,答案是:没影响。具体可看下面实现的列子代码:

import torch
from torch.nn import Embeddingclass Model(torch.nn.Module):def __init__(self):super(Model, self).__init__()self.emb = Embedding(5, 3)self.register_buffer("position_emb", torch.randn((5, 3)))def forward(self,vec):input = torch.tensor([0, 1, 2, 3, 4])emb_vec1 = self.emb(input)emb_vec1=emb_vec1+self.position_emboutput = torch.einsum('ik, kj -> ij', emb_vec1, vec)return output
def simple_train():model = Model()vec = torch.randn((3, 1))label = torch.Tensor(5, 1).fill_(3)loss_fun = torch.nn.MSELoss()opt = torch.optim.SGD(model.parameters(), lr=0.015)print('初始化后position_emb参数:\n',model.position_emb)for iter_num in range(100):output = model(vec)loss = loss_fun(output, label)opt.zero_grad()loss.backward(retain_graph=True)opt.step()print('训练后position_emb参数:\n', model.position_emb)if __name__ == '__main__':simple_train()  # 训练与保存权重

实现结果如下:

在这里插入图片描述


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