encoding and decoding pictures pytorch2019 Community Moderator ElectionUnicodeEncodeError: 'ascii' codec can't encode character u'xa0' in position 20: ordinal not in range(128)Model summary in pytorchTaking subsets of a pytorch datasetPyTorch Softmax Dimensions errorHow to initialize weights in PyTorch?Implementing a custom dataset with PyTorchEncoder Decoder Architecture in Pytorchcoverting roi pooling in pytorch to nn layerTrying to understand Pytorch neural translation code for decoderLSTM Encoder and Decoder architecture for specific case in Pytorch
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How do we create new idioms and use them in a novel?
Translation of 答えを知っている人はいませんでした
Short scifi story where reproductive organs are converted to produce "materials", pregnant protagonist is "found fit" to be a mother
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Cycles on the torus
encoding and decoding pictures pytorch
2019 Community Moderator ElectionUnicodeEncodeError: 'ascii' codec can't encode character u'xa0' in position 20: ordinal not in range(128)Model summary in pytorchTaking subsets of a pytorch datasetPyTorch Softmax Dimensions errorHow to initialize weights in PyTorch?Implementing a custom dataset with PyTorchEncoder Decoder Architecture in Pytorchcoverting roi pooling in pytorch to nn layerTrying to understand Pytorch neural translation code for decoderLSTM Encoder and Decoder architecture for specific case in Pytorch
Task: Using the example of the "fetch_lfw_people" dataset to write and train an autocoder.
Write an iteration code by epoch. Write code to visualize the learning process and count the metrics for validation after each epoch.
Train auto encoder. Achieve low loss on validation.
My code:
from sklearn.datasets import fetch_lfw_people
import numpy as np
import torch
from torch.utils.data import TensorDataset, DataLoader
from sklearn.model_selection import train_test_split
Data preparation:
lfw_people = fetch_lfw_people(min_faces_per_person=70, resize=0.4)
X = lfw_people['images']
X_train, X_test = train_test_split(X, test_size=0.1)
X_train = torch.tensor(X_train, dtype=torch.float32, requires_grad=True)
X_test = torch.tensor(X_test, dtype=torch.float32, requires_grad=False)
dataset_train = TensorDataset(X_train, torch.zeros(len(X_train)))
dataset_test = TensorDataset(X_test, torch.zeros(len(X_test)))
batch_size = 32
train_loader = DataLoader(dataset_train, batch_size=batch_size, shuffle=True)
test_loader = DataLoader(dataset_test, batch_size=batch_size, shuffle=False)
Сreate a network with encoding and decoding functions:
class Autoencoder(torch.nn.Module):
def __init__(self):
super(Autoencoder, self).__init__()
self.encoder = torch.nn.Sequential(
torch.nn.Conv2d(in_channels=1, out_channels=32, kernel_size=3, stride=2),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=32, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3)
)
self.decoder = torch.nn.Sequential(
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=3, stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=(3,4), stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=32, kernel_size=4, stride=2),
torch.nn.ConvTranspose2d(in_channels=32, out_channels=1, kernel_size=(4,3), stride=2)
)
def encode(self, X):
encoded_X = self.encoder(X)
batch_size = X.shape[0]
return encoded_X.reshape(batch_size, -1)
def decode(self, X):
pre_decoder = X.reshape(-1, 64, 2, 1)
return self.decoder(pre_decoder)
I check the work of the model before learning by one example:
model = Autoencoder()
sample = X_test[:1]
sample = sample[:, None]
result = model.decode(model.encode(sample)) # before train
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(result[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
The result is unsatisfactory. I start training:
model = Autoencoder()
loss = torch.nn.MSELoss()
optimizer = torch.optim.Adam(model.parameters(), lr=0.001)
history_train = []
history_test = []
for i in range(5):
for x, y in train_loader:
x = x[:, None]
model.train()
decoded_x = model.decode(model.encode(x))
mse_loss = loss(torch.tensor(decoded_x, dtype=torch.float), x)
optimizer.zero_grad()
mse_loss.backward()
optimizer.step()
history_train.append(mse_loss.detach().numpy())
model.eval()
with torch.no_grad():
for x, y in train_loader:
x = x[:, None]
result_x = model.decode(model.encode(x))
loss_test = loss(torch.tensor(result_x, dtype=torch.float), x)
history_test.append(loss_test.detach().numpy())
plt.subplot(1, 2, 1)
plt.plot(history_train)
plt.title("Optimization process for train data")
plt.subplot(1, 2, 2)
plt.plot(history_test)
plt.title("Loss for test data")
plt.show
A huge loss on the training data and on the test.
Аfter training nothing has changed:
with torch.no_grad():
model.eval()
res1 = model.decode(model.encode(sample))
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(res1[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
Why such a big loss? Reducing the input to the interval [-1, 1] does not help. I did it like this: (value / 255) * 2 - 1
Why do not change the parameters of the model after training?
Why does not change the decoded sample?
Result: before train, after train, loss
https://i.stack.imgur.com/OhdrJ.jpg
python machine-learning neural-network pytorch
New contributor
add a comment |
Task: Using the example of the "fetch_lfw_people" dataset to write and train an autocoder.
Write an iteration code by epoch. Write code to visualize the learning process and count the metrics for validation after each epoch.
Train auto encoder. Achieve low loss on validation.
My code:
from sklearn.datasets import fetch_lfw_people
import numpy as np
import torch
from torch.utils.data import TensorDataset, DataLoader
from sklearn.model_selection import train_test_split
Data preparation:
lfw_people = fetch_lfw_people(min_faces_per_person=70, resize=0.4)
X = lfw_people['images']
X_train, X_test = train_test_split(X, test_size=0.1)
X_train = torch.tensor(X_train, dtype=torch.float32, requires_grad=True)
X_test = torch.tensor(X_test, dtype=torch.float32, requires_grad=False)
dataset_train = TensorDataset(X_train, torch.zeros(len(X_train)))
dataset_test = TensorDataset(X_test, torch.zeros(len(X_test)))
batch_size = 32
train_loader = DataLoader(dataset_train, batch_size=batch_size, shuffle=True)
test_loader = DataLoader(dataset_test, batch_size=batch_size, shuffle=False)
Сreate a network with encoding and decoding functions:
class Autoencoder(torch.nn.Module):
def __init__(self):
super(Autoencoder, self).__init__()
self.encoder = torch.nn.Sequential(
torch.nn.Conv2d(in_channels=1, out_channels=32, kernel_size=3, stride=2),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=32, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3)
)
self.decoder = torch.nn.Sequential(
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=3, stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=(3,4), stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=32, kernel_size=4, stride=2),
torch.nn.ConvTranspose2d(in_channels=32, out_channels=1, kernel_size=(4,3), stride=2)
)
def encode(self, X):
encoded_X = self.encoder(X)
batch_size = X.shape[0]
return encoded_X.reshape(batch_size, -1)
def decode(self, X):
pre_decoder = X.reshape(-1, 64, 2, 1)
return self.decoder(pre_decoder)
I check the work of the model before learning by one example:
model = Autoencoder()
sample = X_test[:1]
sample = sample[:, None]
result = model.decode(model.encode(sample)) # before train
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(result[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
The result is unsatisfactory. I start training:
model = Autoencoder()
loss = torch.nn.MSELoss()
optimizer = torch.optim.Adam(model.parameters(), lr=0.001)
history_train = []
history_test = []
for i in range(5):
for x, y in train_loader:
x = x[:, None]
model.train()
decoded_x = model.decode(model.encode(x))
mse_loss = loss(torch.tensor(decoded_x, dtype=torch.float), x)
optimizer.zero_grad()
mse_loss.backward()
optimizer.step()
history_train.append(mse_loss.detach().numpy())
model.eval()
with torch.no_grad():
for x, y in train_loader:
x = x[:, None]
result_x = model.decode(model.encode(x))
loss_test = loss(torch.tensor(result_x, dtype=torch.float), x)
history_test.append(loss_test.detach().numpy())
plt.subplot(1, 2, 1)
plt.plot(history_train)
plt.title("Optimization process for train data")
plt.subplot(1, 2, 2)
plt.plot(history_test)
plt.title("Loss for test data")
plt.show
A huge loss on the training data and on the test.
Аfter training nothing has changed:
with torch.no_grad():
model.eval()
res1 = model.decode(model.encode(sample))
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(res1[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
Why such a big loss? Reducing the input to the interval [-1, 1] does not help. I did it like this: (value / 255) * 2 - 1
Why do not change the parameters of the model after training?
Why does not change the decoded sample?
Result: before train, after train, loss
https://i.stack.imgur.com/OhdrJ.jpg
python machine-learning neural-network pytorch
New contributor
What's the exact point of including a bunch ofplot
commands without showing their results?
– desertnaut
Mar 7 at 0:06
Thanks! Results added.
– TGorlenko
2 days ago
add a comment |
Task: Using the example of the "fetch_lfw_people" dataset to write and train an autocoder.
Write an iteration code by epoch. Write code to visualize the learning process and count the metrics for validation after each epoch.
Train auto encoder. Achieve low loss on validation.
My code:
from sklearn.datasets import fetch_lfw_people
import numpy as np
import torch
from torch.utils.data import TensorDataset, DataLoader
from sklearn.model_selection import train_test_split
Data preparation:
lfw_people = fetch_lfw_people(min_faces_per_person=70, resize=0.4)
X = lfw_people['images']
X_train, X_test = train_test_split(X, test_size=0.1)
X_train = torch.tensor(X_train, dtype=torch.float32, requires_grad=True)
X_test = torch.tensor(X_test, dtype=torch.float32, requires_grad=False)
dataset_train = TensorDataset(X_train, torch.zeros(len(X_train)))
dataset_test = TensorDataset(X_test, torch.zeros(len(X_test)))
batch_size = 32
train_loader = DataLoader(dataset_train, batch_size=batch_size, shuffle=True)
test_loader = DataLoader(dataset_test, batch_size=batch_size, shuffle=False)
Сreate a network with encoding and decoding functions:
class Autoencoder(torch.nn.Module):
def __init__(self):
super(Autoencoder, self).__init__()
self.encoder = torch.nn.Sequential(
torch.nn.Conv2d(in_channels=1, out_channels=32, kernel_size=3, stride=2),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=32, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3)
)
self.decoder = torch.nn.Sequential(
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=3, stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=(3,4), stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=32, kernel_size=4, stride=2),
torch.nn.ConvTranspose2d(in_channels=32, out_channels=1, kernel_size=(4,3), stride=2)
)
def encode(self, X):
encoded_X = self.encoder(X)
batch_size = X.shape[0]
return encoded_X.reshape(batch_size, -1)
def decode(self, X):
pre_decoder = X.reshape(-1, 64, 2, 1)
return self.decoder(pre_decoder)
I check the work of the model before learning by one example:
model = Autoencoder()
sample = X_test[:1]
sample = sample[:, None]
result = model.decode(model.encode(sample)) # before train
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(result[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
The result is unsatisfactory. I start training:
model = Autoencoder()
loss = torch.nn.MSELoss()
optimizer = torch.optim.Adam(model.parameters(), lr=0.001)
history_train = []
history_test = []
for i in range(5):
for x, y in train_loader:
x = x[:, None]
model.train()
decoded_x = model.decode(model.encode(x))
mse_loss = loss(torch.tensor(decoded_x, dtype=torch.float), x)
optimizer.zero_grad()
mse_loss.backward()
optimizer.step()
history_train.append(mse_loss.detach().numpy())
model.eval()
with torch.no_grad():
for x, y in train_loader:
x = x[:, None]
result_x = model.decode(model.encode(x))
loss_test = loss(torch.tensor(result_x, dtype=torch.float), x)
history_test.append(loss_test.detach().numpy())
plt.subplot(1, 2, 1)
plt.plot(history_train)
plt.title("Optimization process for train data")
plt.subplot(1, 2, 2)
plt.plot(history_test)
plt.title("Loss for test data")
plt.show
A huge loss on the training data and on the test.
Аfter training nothing has changed:
with torch.no_grad():
model.eval()
res1 = model.decode(model.encode(sample))
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(res1[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
Why such a big loss? Reducing the input to the interval [-1, 1] does not help. I did it like this: (value / 255) * 2 - 1
Why do not change the parameters of the model after training?
Why does not change the decoded sample?
Result: before train, after train, loss
https://i.stack.imgur.com/OhdrJ.jpg
python machine-learning neural-network pytorch
New contributor
Task: Using the example of the "fetch_lfw_people" dataset to write and train an autocoder.
Write an iteration code by epoch. Write code to visualize the learning process and count the metrics for validation after each epoch.
Train auto encoder. Achieve low loss on validation.
My code:
from sklearn.datasets import fetch_lfw_people
import numpy as np
import torch
from torch.utils.data import TensorDataset, DataLoader
from sklearn.model_selection import train_test_split
Data preparation:
lfw_people = fetch_lfw_people(min_faces_per_person=70, resize=0.4)
X = lfw_people['images']
X_train, X_test = train_test_split(X, test_size=0.1)
X_train = torch.tensor(X_train, dtype=torch.float32, requires_grad=True)
X_test = torch.tensor(X_test, dtype=torch.float32, requires_grad=False)
dataset_train = TensorDataset(X_train, torch.zeros(len(X_train)))
dataset_test = TensorDataset(X_test, torch.zeros(len(X_test)))
batch_size = 32
train_loader = DataLoader(dataset_train, batch_size=batch_size, shuffle=True)
test_loader = DataLoader(dataset_test, batch_size=batch_size, shuffle=False)
Сreate a network with encoding and decoding functions:
class Autoencoder(torch.nn.Module):
def __init__(self):
super(Autoencoder, self).__init__()
self.encoder = torch.nn.Sequential(
torch.nn.Conv2d(in_channels=1, out_channels=32, kernel_size=3, stride=2),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=32, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3),
torch.nn.ReLU(),
torch.nn.Conv2d(in_channels=64, out_channels=64, stride=2, kernel_size=3)
)
self.decoder = torch.nn.Sequential(
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=3, stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=64, kernel_size=(3,4), stride=2),
torch.nn.ConvTranspose2d(in_channels=64, out_channels=32, kernel_size=4, stride=2),
torch.nn.ConvTranspose2d(in_channels=32, out_channels=1, kernel_size=(4,3), stride=2)
)
def encode(self, X):
encoded_X = self.encoder(X)
batch_size = X.shape[0]
return encoded_X.reshape(batch_size, -1)
def decode(self, X):
pre_decoder = X.reshape(-1, 64, 2, 1)
return self.decoder(pre_decoder)
I check the work of the model before learning by one example:
model = Autoencoder()
sample = X_test[:1]
sample = sample[:, None]
result = model.decode(model.encode(sample)) # before train
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(result[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
The result is unsatisfactory. I start training:
model = Autoencoder()
loss = torch.nn.MSELoss()
optimizer = torch.optim.Adam(model.parameters(), lr=0.001)
history_train = []
history_test = []
for i in range(5):
for x, y in train_loader:
x = x[:, None]
model.train()
decoded_x = model.decode(model.encode(x))
mse_loss = loss(torch.tensor(decoded_x, dtype=torch.float), x)
optimizer.zero_grad()
mse_loss.backward()
optimizer.step()
history_train.append(mse_loss.detach().numpy())
model.eval()
with torch.no_grad():
for x, y in train_loader:
x = x[:, None]
result_x = model.decode(model.encode(x))
loss_test = loss(torch.tensor(result_x, dtype=torch.float), x)
history_test.append(loss_test.detach().numpy())
plt.subplot(1, 2, 1)
plt.plot(history_train)
plt.title("Optimization process for train data")
plt.subplot(1, 2, 2)
plt.plot(history_test)
plt.title("Loss for test data")
plt.show
A huge loss on the training data and on the test.
Аfter training nothing has changed:
with torch.no_grad():
model.eval()
res1 = model.decode(model.encode(sample))
fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2)
ax1.imshow(sample[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
ax2.imshow(res1[0][0].detach().numpy(), cmap=plt.cm.Greys_r)
plt.show()
Why such a big loss? Reducing the input to the interval [-1, 1] does not help. I did it like this: (value / 255) * 2 - 1
Why do not change the parameters of the model after training?
Why does not change the decoded sample?
Result: before train, after train, loss
https://i.stack.imgur.com/OhdrJ.jpg
python machine-learning neural-network pytorch
python machine-learning neural-network pytorch
New contributor
New contributor
edited 2 days ago
TGorlenko
New contributor
asked Mar 6 at 23:12
TGorlenkoTGorlenko
62
62
New contributor
New contributor
What's the exact point of including a bunch ofplot
commands without showing their results?
– desertnaut
Mar 7 at 0:06
Thanks! Results added.
– TGorlenko
2 days ago
add a comment |
What's the exact point of including a bunch ofplot
commands without showing their results?
– desertnaut
Mar 7 at 0:06
Thanks! Results added.
– TGorlenko
2 days ago
What's the exact point of including a bunch of
plot
commands without showing their results?– desertnaut
Mar 7 at 0:06
What's the exact point of including a bunch of
plot
commands without showing their results?– desertnaut
Mar 7 at 0:06
Thanks! Results added.
– TGorlenko
2 days ago
Thanks! Results added.
– TGorlenko
2 days ago
add a comment |
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What's the exact point of including a bunch of
plot
commands without showing their results?– desertnaut
Mar 7 at 0:06
Thanks! Results added.
– TGorlenko
2 days ago