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pytorch中Parameter函数

鬼道2022 人气:0

用法介绍

pytorch中的Parameter函数可以对某个张量进行参数化。它可以将不可训练的张量转化为可训练的参数类型,同时将转化后的张量绑定到模型可训练参数的列表中,当更新模型的参数时一并将其更新。

torch.nn.parameter.Parameter

代码介绍

 pytorch中的Parameter函数具体的代码示例如下所示

import torch
import torch.nn as nn
class NeuralNetwork(nn.Module):
	def __init__(self, input_dim, output_dim):
		super(NeuralNetwork, self).__init__()
		self.linear = nn.Linear(input_dim, output_dim)
		self.linear.weight = torch.nn.Parameter(torch.zeros(input_dim, output_dim))
		self.linear.bias = torch.nn.Parameter(torch.ones(output_dim))
	def forward(self, input_array):
		output = self.linear(input_array)
		return output
if __name__ == '__main__':
	net = NeuralNetwork(4, 6)
	for param in net.parameters():
		print(param)

代码的结果如下所示:

 当神经网络的参数不是用Parameter函数参数化直接赋值给权重参数时,则会报错,具体的程序

import torch
import torch.nn as nn
class NeuralNetwork(nn.Module):
	def __init__(self, input_dim, output_dim):
		super(NeuralNetwork, self).__init__()
		self.linear = nn.Linear(input_dim, output_dim)
		self.linear.weight = torch.zeros(input_dim, output_dim)
		self.linear.bias = torch.ones(output_dim)
	def forward(self, input_array):
		output = self.linear(input_array)
		return output
if __name__ == '__main__':
	net = NeuralNetwork(4, 6)
	for param in net.parameters():
		print(param)

代码运行报错结果如下所示:

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