基于MindSpore 在N(0,I)分布下随机采样表观隐变量与几何隐变量,产生具有多样性的生成图像。
时间: 2024-02-23 11:03:36 浏览: 17
要基于MindSpore在N(0,I)分布下随机采样表观隐变量与几何隐变量,产生具有多样性的生成图像,可以按照以下步骤进行:
1. 安装MindSpore并导入相关库:
```python
!pip install mindspore
import mindspore as ms
import numpy as np
import matplotlib.pyplot as plt
```
2. 定义网络结构。这里我们使用一个简单的生成器,它由一个全连接层和几个转置卷积层组成:
```python
class Generator(ms.nn.Cell):
def __init__(self):
super(Generator, self).__init__()
self.fc = ms.nn.Dense(4 * 4 * 128, 256)
self.conv1 = ms.nn.Conv2dTranspose(128, 64, 4, stride=2, pad_mode='same')
self.conv2 = ms.nn.Conv2dTranspose(64, 1, 4, stride=2, pad_mode='same')
self.bn1 = ms.nn.BatchNorm2d(64)
self.bn2 = ms.nn.BatchNorm2d(1)
self.relu = ms.nn.ReLU()
def construct(self, z, c):
x = ms.ops.Concat()(z, c)
x = self.fc(x)
x = self.relu(x)
x = ms.ops.Reshape()(x, (-1, 128, 4, 4))
x = self.conv1(x)
x = self.bn1(x)
x = self.relu(x)
x = self.conv2(x)
x = self.bn2(x)
x = ms.ops.Tanh()(x)
return x
```
其中,`z`是表观隐变量,`c`是几何隐变量。
3. 定义损失函数。这里我们使用二元交叉熵损失函数:
```python
criterion = ms.nn.BCELoss(reduction='mean')
```
4. 定义优化器:
```python
generator_opt = ms.nn.Adam(generator_net.trainable_params(), learning_rate=0.0002, beta1=0.5)
```
5. 开始训练。首先,我们需要在N(0,I)分布下生成表观隐变量和几何隐变量:
```python
Z = np.random.normal(0, 1, size=(batch_size, 100)).astype(np.float32)
C = np.random.normal(0, 1, size=(batch_size, 2)).astype(np.float32)
```
然后,将这些隐变量输入到生成器中,生成图像:
```python
fake_images = generator_net(ms.Tensor(Z), ms.Tensor(C))
```
接下来,计算生成图像与真实图像之间的损失,并反向传播更新生成器的参数:
```python
d_loss = criterion(discriminator_net(fake_images), ms.Tensor(np.ones((batch_size, 1)).astype(np.float32)))
g_loss = criterion(discriminator_net(fake_images), ms.Tensor(np.zeros((batch_size, 1)).astype(np.float32)))
generator_opt.minimize(g_loss, sens=g_loss)
```
6. 最后,将生成的图像可视化:
```python
plt.imshow(np.transpose((fake_images.asnumpy()[0, 0, :, :] + 1) / 2, (1, 0)), cmap='gray')
plt.show()
```
以上就是基于MindSpore在N(0,I)分布下随机采样表观隐变量与几何隐变量,产生具有多样性的生成图像的步骤。完整的代码如下: