nn.init.zeros_

The `nn.init.zeros_()` function initializes the weights of a neural network layer with zeros.

The function takes a tensor (weights) as input and sets all the elements to zero. This can be useful as a starting point for training a neural network, but it can also cause problems with vanishing gradients if used indiscriminately.

Here's an example of how to use `nn.init.zeros_()`:

import torch.nn as nn
import torch

# create a tensor with random values
weights = torch.randn(3, 4)

# initialize the tensor with zeros
nn.init.zeros_(weights)

print(weights)

Output:

tensor([[0., 0., 0., 0.],
        [0., 0., 0., 0.],
        [0., 0., 0., 0.]])

相关问题

class GNNLayer(nn.Module): def __init__(self, in_feats, out_feats, mem_size, num_rels, bias=True, activation=None, self_loop=True, dropout=0.0, layer_norm=False): super(GNNLayer, self).__init__() self.in_feats = in_feats self.out_feats = out_feats self.mem_size = mem_size self.num_rels = num_rels self.bias = bias self.activation = activation self.self_loop = self_loop self.layer_norm = layer_norm self.node_ME = MemoryEncoding(in_feats, out_feats, mem_size) self.rel_ME = nn.ModuleList([ MemoryEncoding(in_feats, out_feats, mem_size) for i in range(self.num_rels) ]) if self.bias: self.h_bias = nn.Parameter(torch.empty(out_feats)) nn.init.zeros_(self.h_bias) if self.layer_norm: self.layer_norm_weight = nn.LayerNorm(out_feats) self.dropout = nn.Dropout(dropout)

这段代码定义了一个 `GNNLayer` 类，它是一个图神经网络（GNN）的层。让我来解释一下每个部分的作用：

- `in_feats`：输入特征的大小。
- `out_feats`：输出特征的大小。
- `mem_size`：内存大小。
- `num_rels`：关系类型的数量。
- `bias`：是否使用偏置项。
- `activation`：激活函数（如果有）。
- `self_loop`：是否使用自环（self-loop）边。
- `dropout`：Dropout 的概率。
- `layer_norm`：是否使用层归一化（layer normalization）。

接下来，具体说明 `GNNLayer` 类的初始化过程：

- 调用 `super()` 函数来初始化基类 `nn.Module`，并保存输入参数为类的属性。
- 创建了一个名为 `node_ME` 的 `MemoryEncoding` 实例，用于处理节点特征。
- 创建了一个长度为 `num_rels` 的 `nn.ModuleList`，其中每个元素是一个名为 `rel_ME` 的 `MemoryEncoding` 实例，用于处理关系特征。
- 如果设置了 `bias`，则创建了一个可学习的偏置项参数 `h_bias`。
- 如果设置了 `layer_norm`，则创建了一个层归一化的权重参数 `layer_norm_weight`。
- 创建了一个 Dropout 层，用于进行随机失活操作。

这段代码展示了如何初始化一个 GNN 层，并配置其中所需的各种参数和组件。

class NormedLinear(nn.Module): def __init__(self, feat_dim, num_classes): super().__init__() self.weight = nn.Parameter(torch.Tensor(feat_dim, num_classes)) self.weight.data.uniform_(-1, 1).renorm_(2, 1, 1e-5).mul_(1e5) def forward(self, x): return F.normalize(x, dim=1).mm(F.normalize(self.weight, dim=0)) class LearnableWeightScalingLinear(nn.Module): def __init__(self, feat_dim, num_classes, use_norm=False): super().__init__() self.classifier = NormedLinear(feat_dim, num_classes) if use_norm else nn.Linear(feat_dim, num_classes) self.learned_norm = nn.Parameter(torch.ones(1, num_classes)) def forward(self, x): return self.classifier(x) * self.learned_norm class DisAlignLinear(nn.Module): def __init__(self, feat_dim, num_classes, use_norm=False): super().__init__() self.classifier = NormedLinear(feat_dim, num_classes) if use_norm else nn.Linear(feat_dim, num_classes) self.learned_magnitude = nn.Parameter(torch.ones(1, num_classes)) self.learned_margin = nn.Parameter(torch.zeros(1, num_classes)) self.confidence_layer = nn.Linear(feat_dim, 1) torch.nn.init.constant_(self.confidence_layer.weight, 0.1) def forward(self, x): output = self.classifier(x) confidence = self.confidence_layer(x).sigmoid() return (1 + confidence * self.learned_magnitude) * output + confidence * self.learned_margin class MLP_ConClassfier(nn.Module): def __init__(self): super(MLP_ConClassfier, self).__init__() self.num_inputs, self.num_hiddens_1, self.num_hiddens_2, self.num_hiddens_3, self.num_outputs \ = 41, 512, 128, 32, 5 self.num_proj_hidden = 32 self.mlp_conclassfier = nn.Sequential( nn.Linear(self.num_inputs, self.num_hiddens_1), nn.ReLU(), nn.Linear(self.num_hiddens_1, self.num_hiddens_2), nn.ReLU(), nn.Linear(self.num_hiddens_2, self.num_hiddens_3), ) self.fc1 = torch.nn.Linear(self.num_hiddens_3, self.num_proj_hidden) self.fc2 = torch.nn.Linear(self.num_proj_hidden, self.num_hiddens_3) self.linearclassfier = nn.Linear(self.num_hiddens_3, self.num_outputs) self.NormedLinearclassfier = NormedLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs) self.DisAlignLinearclassfier = DisAlignLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs, use_norm=True) self.LearnableWeightScalingLinearclassfier = LearnableWeightScalingLinear(feat_dim=self.num_hiddens_3, num_classes=self.num_outputs, use_norm=True)

这段代码定义了一个名为MLP_ConClassfier的神经网络模型，它包含了多个子模块，包括三个不同的分类器：NormedLinearclassfier、DisAlignLinearclassfier和LearnableWeightScalingLinearclassfier。这些分类器都是基于输入特征进行分类的，并且使用不同的方法来实现分类功能。此外，该模型还包含了一个MLP网络，用于将输入特征映射到更高维的特征空间中。该模型的输入特征维度为41，输出类别数为5。