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多层自编码器手写版

2021-12-21 15:04 113 查看

 

#导入实验需要的包
import torch
import torch.nn as nn
import torch.utils.data as Data
import torchvision
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
from matplotlib import cm
import numpy as np
# torch.manual_seed(1)    # reproducible

#超参数
# Hyper Parameters
EPOCH = 10
BATCH_SIZE = 64
LR = 0.005         # learning rate
DOWNLOAD_MNIST = True
N_TEST_IMG = 5

#下载数据集
# Mnist digits dataset
train_dataset = torchvision.datasets.MNIST(
root='./mnist/',
train=True,                                     # this is training data
transform=torchvision.transforms.ToTensor(),
download=DOWNLOAD_MNIST,                        # download it if you don't have it
)

# plot one example
print(train_dataset.train_data.size())     # (60000, 28, 28)
print(train_dataset.train_labels.size())   # (60000)
plt.imshow(train_dataset.train_data[2].n
ad8
umpy(), cmap='gray')
plt.title('%i' % train_dataset.train_labels[2])
plt.show()

# Data Loader for easy mini-batch return in training, the image batch shape will be (50, 1, 28, 28)
train_loader = Data.DataLoader(dataset=train_dataset, batch_size=BATCH_SIZE, shuffle=True)

#模型
class AutoEncoder(nn.Module):
def __init__(self):
super(AutoEncoder, self).__init__()

self.encoder = nn.Sequential(
nn.Linear(28*28, 128),
nn.Tanh(),
nn.Linear(128, 64),
nn.Tanh(),
nn.Linear(64, 12),
nn.Tanh(),
nn.Linear(12, 3),   # compress to 3 features which can be visualized in plt
)
self.decoder = nn.Sequential(
nn.Linear(3, 12),
nn.Tanh(),
nn.Linear(12, 64),
nn.Tanh(),
nn.Linear(64, 128),
nn.Tanh(),
nn.Linear(128, 28*28),
nn.Sigmoid(),       # compress to a range (0, 1)
)

def forward(self, x):
encoded = self.encoder(x)
decoded = self.decoder(encoded)
return encoded, decoded

autoencoder = AutoEncoder().cuda()
optimizer = torch.optim.Adam(autoencoder.parameters(), lr=LR)
loss_func = nn.MSELoss()

# initialize figure
f, a = plt.subplots(2, N_TEST_IMG, figsize=(5, 2))
plt.ion()   # continuously plot

# original data (first row) for viewing
view_data = train_dataset.train_data[:N_TEST_IMG].view(-1, 28*28).type(torch.FloatTensor)/255.
for i in range(N_TEST_IMG):
a[0][i].imshow(np.reshape(view_data.data.numpy()[i], (28, 28)), cmap='gray'); a[0][i].set_xticks(()); a[0][i].set_yticks(())

for epoch in range(EPOCH):
for step, (x, b_label) in enumerate(train_loader):
b_x = x.view(-1, 28*28).cuda()   # batch x, shape (batch, 28*28)
b_y = x.view(-1, 28*28).cuda()   # batch y, shape (batch, 28*28)

encoded, decoded = autoencoder(b_x)

loss = loss_func(decoded, b_y)      # mean square error
optimizer.zero_grad()               # clear gradients for this training step
loss
1044
.backward()                     # backpropagation, compute gradients
optimizer.step()                    # apply gradients

if step % 100 == 0:
print('Epoch: ', epoch, '| train loss: %.4f' % loss.data.numpy())

# plotting decoded image (second row)
_, decoded_data = autoencoder(view_data)
for i in range(N_TEST_IMG):
a[1][i].clear()
a[1][i].imshow(np.reshape(decoded_data.data.numpy()[i], (28, 28)), cmap='gray')
a[1][i].set_xticks(()); a[1][i].set_yticks(())
plt.draw(); plt.pause(0.05)

plt.ioff()
plt.show()

# visualize in 3D plot
view_data = train_dataset.train_data[:200].view(-1, 28*28).type(torch.FloatTensor)/255.
encoded_data, _ = autoencoder(view_data)
fig = plt.figure(2); ax = Axes3D(fig)
X, Y, Z = encoded_data.data[:, 0].numpy(), encoded_data.data[:, 1].numpy(), encoded_data.data[:, 2].numpy()
values = train_dataset.train_labels[:200].numpy()
for x, y, z, s in zip(X, Y, Z, values):
c = cm.rainbow(int(255*s/9)); ax.text(x, y, z, s, backgroundcolor=c)
ax.set_xlim(X.min(), X.max()); ax.set_ylim(Y.min(), Y.max()); ax.set_zlim(Z.min(), Z.max())
plt.show()

 

#导入实验需要的包
import torch
import torch.nn as nn
import torch.utils.data as Data
import torchvision
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
from matplotlib 30c4 import cm
import numpy as np
# torch.manual_seed(1) # reproducible

#超参数
# Hyper Parameters
EPOCH = 10
BATCH_SIZE = 64
LR = 0.005 # learning rate
DOWNLOAD_MNIST = True
N_TEST_IMG = 5

#下载数据集
# Mnist digits dataset
train_dataset = torchvision.datasets.MNIST(
root='./mnist/',
train=True, # this is training data
transform=torchvision.transforms.ToTensor(),
download=DOWNLOAD_MNIST, # download it if you don't have it
)

# plot one example
print(train_dataset.train_data.size()) # (60000, 28, 28)
print(train_dataset.train_labels.size()) # (60000)
plt.imshow(train_dataset.train_data[2].numpy(), cmap='gray')
plt.title('%i' % train_dataset.train_labels[2])
plt.show()

# Data Loader for easy mini-batch return in training, the image batch shape will be (50, 1, 28, 28)
train_loader = Data.DataLoader(dataset=train_dataset, batch_size=BATCH_SIZE, shuffle=True)

#模型
class AutoEncoder(nn.Module):
def __init__(self):
super(AutoEncoder, self).__init__()

self.encoder = nn.Sequential(
nn.Linear(28*28, 128),
nn.Tanh(),
nn.Linear(128, 64),
nn.Tanh(),
nn.Linear(64, 12),
nn.Tanh(),
nn.Linear(12, 3), # compress to 3 features which can be visualized in plt
)
self.decoder = nn.Sequential(
nn.Linear(3, 12),
nn.Tanh(),
nn.Linear(12, 64),
nn.Tanh(),
nn.Linear(64, 128),
nn.Tanh(),
nn.Linear(128, 28*28),
nn.Sigmoid(), # compress to a range (0, 1)
)

def forward(self, x):
encoded = self.encoder(x)
decoded = self.decoder(encoded)
return encoded, decoded


autoencoder = AutoEncoder().cuda()
optimizer = torch.optim.Adam(autoencoder.parameters(), lr=LR)
loss_func = nn.MSELoss()

# initialize figure
f, a = plt.subplots(2, N_TEST_IMG, figsize=(5, 2))
plt.ion() # continuously plot

# original data (first row) for viewing
view_data = train_dataset.train_data[:N_TEST_IMG].view(-1, 28*28).type(torch.FloatTensor)/255.
for i in range(N_TEST_IMG):
a[0][i].imshow(np.reshape(view_data.data.numpy()[i], (28, 28)), cmap='gray'); a[0][i].set_xticks(()); a[0][i].set_yticks(())

for epoch in range(EPOCH):
for step, (x, b_label) in enumerate(train_loader):
b_x = x.view(-1, 28*28).cuda() # batch x, shape (batch, 28*28)
b_y = x.view(-1, 28*28).cuda() # batch y, shape (batch, 28*28)

encoded, decoded = autoencoder(b_x)

loss = loss_func(decoded, b_y) # mean square error
optimizer.zero_grad() # clear gradients for this training step
loss.backward() # backpropagation, compute gradients
optimizer.step() # apply gradients

if step % 100 == 0:
print('Epoch: ', epoch, '| train loss: %.4f' % loss.data.numpy())

# plotting decoded image (second row)
_, decoded_data = autoencoder(view_data)
for i in range(N_TEST_IMG):
a[1][i].clear()
a[1][i].imshow(np.reshape(decoded_data.data.numpy()[ 1044 i], (28, 28)), cmap='gray')
a[1][i].set_xticks(()); a[1][i].set_yticks(())
plt.draw(); plt.pause(0.05)

plt.ioff()
plt.show()

# visualize in 3D plot
view_data = train_dataset.train_data[:200].view(-1, 28*28).type(torch.FloatTensor)/255.
encoded_data, _ = autoencoder(view_data)
fig = plt.figure(2); ax = Axes3D(fig)
X, Y, Z = encoded_data.data[:, 0].numpy(), encoded_data.data[:, 1].numpy(), encoded_data.data[:, 2].numpy()
values = train_dataset.train_labels[:200].numpy()
for x, y, z, s in zip(X, Y, Z, values):
c = cm.rainbow(int(255*s/9)); ax.text(x, y, z, s, backgroundcolor=c)
ax.set_xlim(X.min(), X.max()); ax.set_ylim(Y.min(), Y.max()); ax.set_zlim(Z.min(), Z.max())
plt.show()
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