def run():
# Prepare data
dataset = dp.datasets.MNIST()
x, y = dataset.data(flat=True)
x = x.astype(dp.float_)
y = y.astype(dp.int_)
train_idx, test_idx = dataset.split()
x_train = x[train_idx]
y_train = y[train_idx]
x_test = x[test_idx]
y_test = y[test_idx]
scaler = dp.UniformScaler(high=255.)
x_train = scaler.fit_transform(x_train)
x_test = scaler.transform(x_test)
batch_size = 128
train_input = dp.SupervisedInput(x_train, y_train, batch_size=batch_size)
test_input = dp.SupervisedInput(x_test, y_test)
# Setup neural network
net = dp.NeuralNetwork(
layers=[
dp.FullyConnected(
n_output=800,
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.0001),
),
dp.Activation('relu'),
dp.FullyConnected(
n_output=800,
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.0001),
),
dp.Activation('relu'),
dp.FullyConnected(
n_output=dataset.n_classes,
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.0001),
),
dp.MultinomialLogReg(),
],
)
# Train neural network
def val_error():
return net.error(test_input)
trainer = dp.StochasticGradientDescent(
max_epochs=25,
learn_rule=dp.Momentum(learn_rate=0.1, momentum=0.9),
)
trainer.train(net, train_input, val_error)
# Visualize weights from first layer
W = next(np.array(layer.params()[0].array) for layer in net.layers
if isinstance(layer, dp.FullyConnected))
W = np.reshape(W.T, (-1, 28, 28))
filepath = os.path.join('mnist', 'mlp_weights.png')
dp.misc.img_save(dp.misc.img_tile(dp.misc.img_stretch(W)), filepath)
# Evaluate on test data
error = net.error(test_input)
print('Test error rate: %.4f' % error)
def run():
# Prepare data
dataset = dp.datasets.MNIST()
x, y = dataset.data(flat=True)
x = x.astype(dp.float_)/255.0
y = y.astype(dp.int_)
train_idx, test_idx = dataset.split()
x_train = x[train_idx]
y_train = y[train_idx]
x_test = x[test_idx]
y_test = y[test_idx]
train_input = dp.SupervisedInput(x_train, y_train, batch_size=128)
test_input = dp.SupervisedInput(x_test, y_test)
# Setup neural network
nn = dp.NeuralNetwork(
layers=[
dp.Dropout(0.2),
dp.DropoutFullyConnected(
n_output=800,
dropout=0.5,
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
penalty=('l2', 0.00001), monitor=True),
),
dp.Activation('relu'),
dp.DropoutFullyConnected(
n_output=800,
dropout=0.5,
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
penalty=('l2', 0.00001), monitor=True),
),
dp.Activation('relu'),
dp.DropoutFullyConnected(
n_output=dataset.n_classes,
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
penalty=('l2', 0.00001), monitor=True),
),
dp.MultinomialLogReg(),
],
)
# Train neural network
def valid_error():
return nn.error(test_input)
trainer = dp.StochasticGradientDescent(
max_epochs=50,
learn_rule=dp.Momentum(learn_rate=0.1, momentum=0.9),
)
trainer.train(nn, train_input, valid_error)
# Visualize weights from first layer
W = next(np.array(layer.params()[0].values) for layer in nn.layers
if isinstance(layer, dp.FullyConnected))
W = np.reshape(W.T, (-1, 28, 28))
dp.misc.img_save(dp.misc.img_tile(dp.misc.img_stretch(W)),
os.path.join('mnist', 'mlp_dropout_weights.png'))
# Evaluate on test data
error = nn.error(test_input)
print('Test error rate: %.4f' % error)
def run():
np.random.seed(3)
layers = [
dp.Activation('relu'),
dp.Activation('sigmoid'),
dp.Activation('tanh'),
dp.FullyConnected(
n_output=3,
weights=dp.NormalFiller(sigma=0.01),
),
dp.Dropout(0.2),
dp.DropoutFullyConnected(
n_output=10,
weights=dp.NormalFiller(sigma=0.01),
dropout=0.5,
),
]
input_shape = (1, 5)
x = np.random.normal(size=input_shape).astype(dp.float_)
for layer in layers:
dp.misc.check_bprop(layer, x)
conv_layers = [
dp.Convolutional(
n_filters=32,
filter_shape=(3, 3),
border_mode='same',
weights=dp.NormalFiller(sigma=0.01),
),
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
border_mode='valid',
weights=dp.NormalFiller(sigma=0.01),
),
dp.Pool(
win_shape=(3, 3),
strides=(2, 2),
method='max',
)
]
input_shape = (5, 3, 8, 8)
x = np.random.normal(size=input_shape).astype(dp.float_)
for layer in conv_layers:
dp.misc.check_bprop(layer, x)
def test_activation():
activations = ['sigmoid', 'tanh', 'relu']
confs = itertools.product(batch_sizes, n_ins, activations)
for batch_size, n_in, activation in confs:
print('Activation: batch_size=%i, n_in=%i, fun=%s' %
(batch_size, n_in, activation))
x_shape = (batch_size, n_in)
x = np.random.normal(size=x_shape)
if activation == 'relu':
# Change x values that are too close to 0. The numeric
# differentiation may make such values change sign resulting in
# faulty gradient approximation.
thresh = 1e-04
x[np.logical_and(-thresh < x, x < thresh)] = 0.1
layer = dp.Activation(activation)
layer._setup(x_shape)
assert layer.y_shape(x_shape) == x_shape
check_grad(layer, x)
def run():
# Prepare data
dataset = dp.datasets.MNIST()
x, y = dataset.data()
x = x.astype(dp.float_)[:, np.newaxis, :, :]
y = y.astype(dp.int_)
train_idx, test_idx = dataset.split()
x_train = x[train_idx]
y_train = y[train_idx]
x_test = x[test_idx]
y_test = y[test_idx]
scaler = dp.UniformScaler(high=255.)
x_train = scaler.fit_transform(x_train)
x_test = scaler.transform(x_test)
batch_size = 128
train_input = dp.SupervisedInput(x_train, y_train, batch_size=batch_size)
test_input = dp.SupervisedInput(x_test, y_test)
# Setup neural network
net = dp.NeuralNetwork(layers=[
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.0001),
),
dp.Activation('relu'),
dp.Pool(
win_shape=(3, 3),
strides=(2, 2),
method='max',
),
dp.Convolutional(
n_filters=64,
filter_shape=(5, 5),
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.0001),
),
dp.Activation('relu'),
dp.Pool(
win_shape=(3, 3),
strides=(2, 2),
method='max',
),
dp.Flatten(),
dp.FullyConnected(
n_output=128,
weights=dp.Parameter(dp.AutoFiller()),
),
dp.FullyConnected(
n_output=dataset.n_classes,
weights=dp.Parameter(dp.AutoFiller()),
),
dp.MultinomialLogReg(),
], )
# Train neural network
def val_error():
return net.error(test_input)
trainer = dp.StochasticGradientDescent(
max_epochs=15,
learn_rule=dp.Momentum(learn_rate=0.01, momentum=0.9),
)
trainer.train(net, train_input, val_error)
# Visualize convolutional filters to disk
for l, layer in enumerate(net.layers):
if not isinstance(layer, dp.Convolutional):
continue
W = np.array(layer.params()[0].array)
filepath = os.path.join('mnist', 'conv_layer_%i.png' % l)
dp.misc.img_save(dp.misc.conv_filter_tile(W), filepath)
# Evaluate on test data
error = net.error(test_input)
print('Test error rate: %.4f' % error)
pool_kwargs = {
'win_shape': (3, 3),
'strides': (2, 2),
'border_mode': 'same',
'method': 'max',
}
net = dp.NeuralNetwork(layers=[
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.0001),
weight_decay=0.004,
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
weight_decay=0.004,
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Convolutional(
n_filters=64,
filter_shape=(5, 5),
border_mode='same',
def run():
# Prepare data
batch_size = 128
dataset = dp.datasets.CIFAR10()
x, y = dataset.data()
y = y.astype(dp.int_)
train_idx, test_idx = dataset.split()
x_train = preprocess_imgs(x[train_idx])
y_train = y[train_idx]
train_input = dp.SupervisedInput(x_train, y_train, batch_size=batch_size)
# Setup neural network
pool_kwargs = {
'win_shape': (3, 3),
'strides': (2, 2),
'border_mode': 'same',
'method': 'max',
}
nn = dp.NeuralNetwork(layers=[
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.0001),
penalty=('l2', 0.004),
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
penalty=('l2', 0.004),
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Convolutional(
n_filters=64,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
penalty=('l2', 0.004),
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Flatten(),
dp.FullyConnected(
n_output=64,
weights=dp.Parameter(dp.NormalFiller(sigma=0.1),
penalty=('l2', 0.03)),
),
dp.Activation('relu'),
dp.FullyConnected(
n_output=dataset.n_classes,
weights=dp.Parameter(dp.NormalFiller(sigma=0.1),
penalty=('l2', 0.03)),
),
dp.MultinomialLogReg(),
], )
dp.misc.profile(nn, train_input)
def run():
# Prepare data
batch_size = 128
dataset = dp.datasets.CIFAR10()
x, y = dataset.data()
y = y.astype(dp.int_)
train_idx, test_idx = dataset.split()
x_train = preprocess_imgs(x[train_idx])
y_train = y[train_idx]
x_test = preprocess_imgs(x[test_idx])
y_test = y[test_idx]
train_input = dp.SupervisedInput(x_train, y_train, batch_size=batch_size)
test_input = dp.SupervisedInput(x_test, y_test, batch_size=batch_size)
# Setup neural network
pool_kwargs = {
'win_shape': (3, 3),
'strides': (2, 2),
'border_mode': 'same',
'method': 'max',
}
nn = dp.NeuralNetwork(layers=[
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.0001),
penalty=('l2', 0.004),
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Convolutional(
n_filters=32,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
penalty=('l2', 0.004),
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Convolutional(
n_filters=64,
filter_shape=(5, 5),
border_mode='same',
weights=dp.Parameter(dp.NormalFiller(sigma=0.01),
penalty=('l2', 0.004),
monitor=True),
),
dp.Activation('relu'),
dp.Pool(**pool_kwargs),
dp.Flatten(),
dp.FullyConnected(
n_output=64,
weights=dp.Parameter(dp.NormalFiller(sigma=0.1),
penalty=('l2', 0.03)),
),
dp.Activation('relu'),
dp.FullyConnected(
n_output=dataset.n_classes,
weights=dp.Parameter(dp.NormalFiller(sigma=0.1),
penalty=('l2', 0.03)),
),
dp.MultinomialLogReg(),
], )
# Train neural network
n_epochs = [8, 8]
learn_rate = 0.001
def valid_error():
return nn.error(test_input)
for i, max_epochs in enumerate(n_epochs):
lr = learn_rate / 10**i
trainer = dp.StochasticGradientDescent(
max_epochs=max_epochs,
learn_rule=dp.Momentum(learn_rate=lr, momentum=0.9),
)
trainer.train(nn, train_input, valid_error)
# Visualize convolutional filters to disk
for l, layer in enumerate(nn.layers):
if not isinstance(layer, dp.Convolutional):
continue
W = np.array(layer.params()[0].values)
dp.misc.img_save(dp.misc.conv_filter_tile(W),
os.path.join('cifar10', 'convnet_layer_%i.png' % l))
# Evaluate on test data
error = nn.error(test_input)
print('Test error rate: %.4f' % error)
def run():
# Prepare MNIST data
dataset = dp.datasets.MNIST()
x, y = dataset.data(flat=True)
x = x.astype(dp.float_)
y = y.astype(dp.int_)
train_idx, test_idx = dataset.split()
x_train = x[train_idx]
y_train = y[train_idx]
x_test = x[test_idx]
y_test = y[test_idx]
scaler = dp.UniformScaler(high=255.)
x_train = scaler.fit_transform(x_train)
x_test = scaler.transform(x_test)
# Generate image pairs
n_pairs = 100000
x1 = np.empty((n_pairs, 28 * 28), dtype=dp.float_)
x2 = np.empty_like(x1, dtype=dp.float_)
y = np.empty(n_pairs, dtype=dp.int_)
n_imgs = x_train.shape[0]
n = 0
while n < n_pairs:
i = random.randint(0, n_imgs - 1)
j = random.randint(0, n_imgs - 1)
if i == j:
continue
x1[n, ...] = x_train[i]
x2[n, ...] = x_train[j]
if y_train[i] == y_train[j]:
y[n] = 1
else:
y[n] = 0
n += 1
# Input to network
train_input = dp.SupervisedSiameseInput(x1, x2, y, batch_size=128)
test_input = dp.SupervisedInput(x_test, y_test)
# Setup network
net = dp.SiameseNetwork(
siamese_layers=[
dp.Dropout(),
dp.FullyConnected(
n_output=800,
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.00001),
),
dp.Activation('relu'),
dp.FullyConnected(
n_output=800,
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.00001),
),
dp.Activation('relu'),
dp.FullyConnected(
n_output=2,
weights=dp.Parameter(dp.AutoFiller(), weight_decay=0.00001),
),
],
loss_layer=dp.ContrastiveLoss(margin=0.5),
)
# Train network
trainer = dp.StochasticGradientDescent(
max_epochs=10,
learn_rule=dp.RMSProp(learn_rate=0.001),
)
trainer.train(net, train_input)
# Visualize feature space
feat = net.features(test_input)
colors = [
'tomato', 'lawngreen', 'royalblue', 'gold', 'saddlebrown', 'violet',
'turquoise', 'mediumpurple', 'darkorange', 'darkgray'
]
plt.figure()
for i in range(10):
plt.scatter(feat[y_test == i, 0],
feat[y_test == i, 1],
s=3,
c=colors[i],
linewidths=0)
plt.legend([str(i) for i in range(10)], scatterpoints=1, markerscale=4)
if not os.path.exists('mnist'):
os.mkdirs('mnist')
plt.savefig(os.path.join('mnist', 'siamese_dists.png'), dpi=200)
def run():
# Prepare data
dataset = dp.datasets.MNIST()
x, y = dataset.data()
x = x[:, np.newaxis, :, :].astype(dp.float_) / 255.0 - 0.5
y = y.astype(dp.int_)
train_idx, test_idx = dataset.split()
x_train = x[train_idx]
y_train = y[train_idx]
x_test = x[test_idx]
y_test = y[test_idx]
train_input = dp.SupervisedInput(x_train, y_train, batch_size=128)
test_input = dp.SupervisedInput(x_test, y_test)
# Setup neural network
nn = dp.NeuralNetwork(layers=[
dp.Convolutional(
n_filters=20,
filter_shape=(5, 5),
weights=dp.Parameter(dp.NormalFiller(sigma=0.1),
penalty=('l2', 0.00001)),
),
dp.Activation('relu'),
dp.Pool(
win_shape=(2, 2),
strides=(2, 2),
method='max',
),
dp.Convolutional(
n_filters=50,
filter_shape=(5, 5),
weights=dp.Parameter(dp.NormalFiller(sigma=0.1),
penalty=('l2', 0.00001)),
),
dp.Activation('relu'),
dp.Pool(
win_shape=(2, 2),
strides=(2, 2),
method='max',
),
dp.Flatten(),
dp.FullyConnected(
n_output=500,
weights=dp.NormalFiller(sigma=0.01),
),
dp.FullyConnected(
n_output=dataset.n_classes,
weights=dp.NormalFiller(sigma=0.01),
),
dp.MultinomialLogReg(),
], )
# Train neural network
def valid_error():
return nn.error(test_input)
trainer = dp.StochasticGradientDescent(
max_epochs=15,
learn_rule=dp.Momentum(learn_rate=0.1, momentum=0.9),
)
trainer.train(nn, train_input, valid_error)
# Visualize convolutional filters to disk
for layer_idx, layer in enumerate(nn.layers):
if not isinstance(layer, dp.Convolutional):
continue
W = np.array(layer.params()[0].values)
dp.misc.img_save(
dp.misc.conv_filter_tile(W),
os.path.join('mnist', 'convnet_layer_%i.png' % layer_idx))
# Evaluate on test data
error = nn.error(test_input)
print('Test error rate: %.4f' % error)
def test_classification():
# Make dataset
n_classes = 2
n_samples = 1000
n_features = 48
x, y = make_classification(
n_samples=n_samples, n_features=n_features, n_classes=n_classes,
n_informative=n_classes*2, random_state=1
)
n_train = int(0.8 * n_samples)
n_val = int(0.5 * (n_samples - n_train))
x_train = x[:n_train]
y_train = y[:n_train]
x_val = x[n_train:n_train+n_val]
y_val = y[n_train:n_train+n_val]
x_test = x[n_train+n_val:]
y_test = y[n_train+n_val:]
scaler = dp.StandardScaler()
x_train = scaler.fit_transform(x_train)
x_val = scaler.transform(x_val)
x_test = scaler.transform(x_test)
# Setup input
batch_size = 16
train_input = dp.SupervisedInput(x_train, y_train, batch_size=batch_size)
val_input = dp.Input(x_val)
test_input = dp.Input(x_test)
# Setup neural network
weight_decay = 1e-03
net = dp.NeuralNetwork(
layers=[
dp.FullyConnected(
n_out=32,
weights=dp.Parameter(dp.AutoFiller(),
weight_decay=weight_decay),
),
dp.Activation('relu'),
dp.FullyConnected(
n_out=64,
weights=dp.Parameter(dp.AutoFiller(),
weight_decay=weight_decay),
),
dp.Activation('relu'),
dp.FullyConnected(
n_out=n_classes,
weights=dp.Parameter(dp.AutoFiller()),
),
],
loss=dp.SoftmaxCrossEntropy(),
)
# Train neural network
def val_error():
return np.mean(net.predict(val_input) != y_val)
trainer = dp.StochasticGradientDescent(
min_epochs=10, learn_rule=dp.Momentum(learn_rate=0.01, momentum=0.9),
)
trainer.train(net, train_input, val_error)
# Evaluate on test data
error = np.mean(net.predict(test_input) != y_test)
print('Test error rate: %.4f' % error)
assert error < 0.2
