class Discriminator(Model): def __init__(self, hidden_dim, net_type='GRU'): self.hidden_dim = hidden_dim self.net_type=net_type def build(self, input_shape): model = Sequential(name='Discriminator') model = net(model, n_layers=3, hidden_units=self.hidden_dim, output_units=1, net_type=self.net_type) return model
时间: 2024-02-14 21:26:50 浏览: 63
这段代码定义了一个名为Discriminator的类,继承自Keras的Model类。Discriminator类用于构建一个判别器模型,该模型用于二分类任务。
Discriminator类具有以下方法和属性:
- __init__方法:初始化方法,接受hidden_dim和net_type两个参数。hidden_dim指定隐藏单元的数量,net_type指定RNN类型,默认为'GRU'。
- build方法:构建方法,接受input_shape作为参数。在该方法中,创建一个名为model的Sequential模型对象,并通过调用net函数构建多层GRU或LSTM模型。n_layers参数设置为3,hidden_units设置为self.hidden_dim,output_units设置为1(因为判别器的输出是二分类问题),net_type设置为self.net_type。最后返回构建好的模型对象。
通过创建Discriminator类的实例,你可以使用build方法来构建一个判别器模型,该模型包含多层GRU或LSTM,并且隐藏单元的数量由hidden_dim指定。net_type参数可选,默认为'GRU'。你可以根据需要进行调整。判别器模型可以用于执行二分类任务,例如判断输入数据是否属于某个类别。
相关问题
def define_gan(self): self.generator_aux=Generator(self.hidden_dim).build(input_shape=(self.seq_len, self.n_seq)) self.supervisor=Supervisor(self.hidden_dim).build(input_shape=(self.hidden_dim, self.hidden_dim)) self.discriminator=Discriminator(self.hidden_dim).build(input_shape=(self.hidden_dim, self.hidden_dim)) self.recovery = Recovery(self.hidden_dim, self.n_seq).build(input_shape=(self.hidden_dim, self.hidden_dim)) self.embedder = Embedder(self.hidden_dim).build(input_shape=(self.seq_len, self.n_seq)) X = Input(shape=[self.seq_len, self.n_seq], batch_size=self.batch_size, name='RealData') Z = Input(shape=[self.seq_len, self.n_seq], batch_size=self.batch_size, name='RandomNoise')
这段代码定义了一个名为define_gan的方法,用于在GAN模型中定义生成器(generator)、监督模型(supervisor)、判别器(discriminator)、恢复模型(recovery)和嵌入器(embedder)。
在该方法中,使用各个类的build方法构建了相应的模型,并将其存储在相应的实例变量中:
- self.generator_aux:通过调用Generator类的build方法构建生成器模型。input_shape参数设置为(self.seq_len, self.n_seq)。
- self.supervisor:通过调用Supervisor类的build方法构建监督模型。input_shape参数设置为(self.hidden_dim, self.hidden_dim)。
- self.discriminator:通过调用Discriminator类的build方法构建判别器模型。input_shape参数设置为(self.hidden_dim, self.hidden_dim)。
- self.recovery:通过调用Recovery类的build方法构建恢复模型。input_shape参数设置为(self.hidden_dim, self.hidden_dim)。
- self.embedder:通过调用Embedder类的build方法构建嵌入器模型。input_shape参数设置为(self.seq_len, self.n_seq)。
接下来,定义了两个输入层对象X和Z。它们分别表示真实数据输入和随机噪声输入。X和Z的形状分别为[self.seq_len, self.n_seq],batch_size设置为self.batch_size。
这段代码的目的是在GAN模型中定义各个组件,并创建输入层对象以供后续使用。
运行以下Python代码:import torchimport torch.nn as nnimport torch.optim as optimfrom torchvision import datasets, transformsfrom torch.utils.data import DataLoaderfrom torch.autograd import Variableclass Generator(nn.Module): def __init__(self, input_dim, output_dim, num_filters): super(Generator, self).__init__() self.input_dim = input_dim self.output_dim = output_dim self.num_filters = num_filters self.net = nn.Sequential( nn.Linear(input_dim, num_filters), nn.ReLU(), nn.Linear(num_filters, num_filters*2), nn.ReLU(), nn.Linear(num_filters*2, num_filters*4), nn.ReLU(), nn.Linear(num_filters*4, output_dim), nn.Tanh() ) def forward(self, x): x = self.net(x) return xclass Discriminator(nn.Module): def __init__(self, input_dim, num_filters): super(Discriminator, self).__init__() self.input_dim = input_dim self.num_filters = num_filters self.net = nn.Sequential( nn.Linear(input_dim, num_filters*4), nn.LeakyReLU(0.2), nn.Linear(num_filters*4, num_filters*2), nn.LeakyReLU(0.2), nn.Linear(num_filters*2, num_filters), nn.LeakyReLU(0.2), nn.Linear(num_filters, 1), nn.Sigmoid() ) def forward(self, x): x = self.net(x) return xclass ConditionalGAN(object): def __init__(self, input_dim, output_dim, num_filters, learning_rate): self.generator = Generator(input_dim, output_dim, num_filters) self.discriminator = Discriminator(input_dim+1, num_filters) self.optimizer_G = optim.Adam(self.generator.parameters(), lr=learning_rate) self.optimizer_D = optim.Adam(self.discriminator.parameters(), lr=learning_rate) def train(self, data_loader, num_epochs): for epoch in range(num_epochs): for i, (inputs, labels) in enumerate(data_loader): # Train discriminator with real data real_inputs = Variable(inputs) real_labels = Variable(labels) real_labels = real_labels.view(real_labels.size(0), 1) real_inputs = torch.cat((real_inputs, real_labels), 1) real_outputs = self.discriminator(real_inputs) real_loss = nn.BCELoss()(real_outputs, torch.ones(real_outputs.size())) # Train discriminator with fake data noise = Variable(torch.randn(inputs.size(0), self.generator.input_dim)) fake_labels = Variable(torch.LongTensor(inputs.size(0)).random_(0, 10)) fake_labels = fake_labels.view(fake_labels.size(0), 1) fake_inputs = self.generator(torch.cat((noise, fake_labels.float()), 1)) fake_inputs = torch.cat((fake_inputs, fake_labels), 1) fake_outputs = self.discriminator(fake_inputs) fake_loss = nn.BCELoss()(fake_outputs, torch.zeros(fake_outputs.size())) # Backpropagate and update weights for discriminator discriminator_loss = real_loss + fake_loss self.discriminator.zero_grad() discriminator_loss.backward() self.optimizer_D.step() # Train generator noise = Variable(torch.randn(inputs.size(0), self.generator.input_dim)) fake_labels = Variable(torch.LongTensor(inputs.size(0)).random_(0,
这是一个用 PyTorch 实现的条件 GAN,以下是代码的简要解释:
首先引入 PyTorch 相关的库和模块:
```
import torch
import torch.nn as nn
import torch.optim as optim
from torchvision import datasets, transforms
from torch.utils.data import DataLoader
from torch.autograd import Variable
```
接下来定义生成器(Generator)和判别器(Discriminator)的类:
```
class Generator(nn.Module):
def __init__(self, input_dim, output_dim, num_filters):
super(Generator, self).__init__()
self.input_dim = input_dim
self.output_dim = output_dim
self.num_filters = num_filters
self.net = nn.Sequential(
nn.Linear(input_dim, num_filters),
nn.ReLU(),
nn.Linear(num_filters, num_filters*2),
nn.ReLU(),
nn.Linear(num_filters*2, num_filters*4),
nn.ReLU(),
nn.Linear(num_filters*4, output_dim),
nn.Tanh()
)
def forward(self, x):
x = self.net(x)
return x
class Discriminator(nn.Module):
def __init__(self, input_dim, num_filters):
super(Discriminator, self).__init__()
self.input_dim = input_dim
self.num_filters = num_filters
self.net = nn.Sequential(
nn.Linear(input_dim, num_filters*4),
nn.LeakyReLU(0.2),
nn.Linear(num_filters*4, num_filters*2),
nn.LeakyReLU(0.2),
nn.Linear(num_filters*2, num_filters),
nn.LeakyReLU(0.2),
nn.Linear(num_filters, 1),
nn.Sigmoid()
)
def forward(self, x):
x = self.net(x)
return x
```
其中,生成器接受输入维度 input_dim、输出维度 output_dim 和 num_filters 个特征,采用线性层和激活函数构建多层神经网络。判别器接受输入维度 input_dim 和 num_filters 个特征,同样采用线性层和激活函数构建多层神经网络。
最后定义条件 GAN 的类 ConditionalGAN,该类包括生成器、判别器和优化器,以及 train 方法进行训练:
```
class ConditionalGAN(object):
def __init__(self, input_dim, output_dim, num_filters, learning_rate):
self.generator = Generator(input_dim, output_dim, num_filters)
self.discriminator = Discriminator(input_dim+1, num_filters)
self.optimizer_G = optim.Adam(self.generator.parameters(), lr=learning_rate)
self.optimizer_D = optim.Adam(self.discriminator.parameters(), lr=learning_rate)
def train(self, data_loader, num_epochs):
for epoch in range(num_epochs):
for i, (inputs, labels) in enumerate(data_loader):
...
```
其中,ConditionalGAN 类接受输入维度 input_dim、输出维度 output_dim、特征数 num_filters 和学习率 learning_rate。train 方法则接受数据加载器 data_loader 和训练轮数 num_epochs,用于训练模型。