def test_save_model(self):
"""
:return:
"""
model = Sequential()
model.add(Linear(input_size=2, out=24, activation='tanh'))
model.add(Linear(input_size=24, out=2, activation='tanh'))
pass
def test_load_model(self):
"""
:return:
"""
model = Sequential()
model.add(Linear(input_size=2, out=24, activation='tanh'))
model.add(Linear(input_size=24, out=2, activation='tanh'))
file_name = "model.h5py"
def test_init_not_compatible(self):
with self.assertRaises(NotCompatibleError):
model = Sequential([
Linear(input_size=2, out=22, activation='tanh'),
Linear(input_size=23, out=22, activation='tanh')
# second layer's input_size is not compatible with previous layer output_size
])
def get_categorical_model(input_neurons, output_neurons, layers=None):
"""
creates a model with Categorical Crossentropy Loss
:param input_neurons: input neuron number
:param output_neurons: output neuron number
:param layers: list of intermediate neuron sizes, default is the number of neurons and layer sizes for neuron
:return: network with Categorical Crossentropy loss
"""
if layers is None:
layers = [25, 25, 25]
default_act = 'relu'
model = Sequential()
idx = 1
layers.insert(0, input_neurons)
while idx < len(layers):
model.add(Linear(out=layers[idx], input_size=layers[idx - 1], activation=default_act))
idx += 1
# model.add(Dropout(prob=0.2))
model.add(Linear(out=output_neurons, activation='softmax'))
# Set loss function to model: Sequential object
ce = LossCrossEntropy()
model.loss = ce
return model
def _read_txt_old(path):
print('loading plain text model from', path)
with open(path, 'rb') as f:
content = f.read().split('\n')
modules = []
c = 0
line = content[c]
while len(line) > 0:
if line.startswith(
Linear.__name__
): # @UndefinedVariable import error suppression for PyDev users
lineparts = line.split()
m = int(lineparts[1])
n = int(lineparts[2])
mod = Linear(m, n)
for i in range(m):
c += 1
mod.W[i, :] = np.array([
float(val) for val in content[c].split()
if len(val) > 0
])
c += 1
mod.B = np.array([float(val) for val in content[c].split()])
modules.append(mod)
elif line.startswith(
Rect.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(Rect())
elif line.startswith(
Tanh.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(Tanh())
elif line.startswith(
SoftMax.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(SoftMax())
elif line.startswith(
BinStep.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(BinStep())
elif line.startswith(
NegAbs.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(NegAbs())
else:
raise ValueError('Layer type ' +
[s for s in line.split() if len(s) > 0][0] +
' not supported by legacy plain text format.')
c += 1
line = content[c]
return Sequential(modules)
def test_init_not_input_size(self):
"""
:return:
"""
with self.assertRaises(InputSizeNotFoundError):
model = Sequential([
Linear(out=22, activation='tanh'), # NO input_size is given
Linear(input_size=23, out=22, activation='tanh')
])
def _convert_to_nn(self, svm_model, y_train, x_val):
#convert to linear NN
print('converting {} model to linear NN'.format(
self.__class__.__name__))
W = svm_model.coef_.T
B = svm_model.intercept_
if numpy.unique(y_train).size == 2:
linear_layer = Linear(W.shape[0], 2)
linear_layer.W = numpy.concatenate([-W, W], axis=1)
linear_layer.B = numpy.concatenate([-B, B], axis=0)
else:
linear_layer = Linear(*(W.shape))
linear_layer.W = W
linear_layer.B = B
svm_model = self.model
nn_model = Sequential([Flatten(), linear_layer])
if not self.use_gpu: nn_model.to_numpy()
#sanity check model conversion
self._sanity_check_model_conversion(svm_model, nn_model, x_val)
print('model conversion sanity check passed')
return nn_model
def _read_txt_helper(path):
with open(path, 'rb') as f:
content = f.read().split('\n')
modules = []
c = 0
line = content[c]
while len(line) > 0:
if line.startswith(
Linear.__name__
): # @UndefinedVariable import error suppression for PyDev users
'''
Format of linear layer
Linear <rows_of_W> <columns_of_W>
<flattened weight matrix W>
<flattened bias vector>
'''
_, m, n = line.split()
m = int(m)
n = int(n)
layer = Linear(m, n)
layer.W = np.array([
float(weightstring)
for weightstring in content[c + 1].split()
if len(weightstring) > 0
]).reshape((m, n))
layer.B = np.array([
float(weightstring)
for weightstring in content[c + 2].split()
if len(weightstring) > 0
])
modules.append(layer)
c += 3 # the description of a linear layer spans three lines
elif line.startswith(
Convolution.__name__
): # @UndefinedVariable import error suppression for PyDev users
'''
Format of convolution layer
Convolution <rows_of_W> <columns_of_W> <depth_of_W> <number_of_filters_W> <stride_axis_0> <stride_axis_1>
<flattened filter block W>
<flattened bias vector>
'''
_, h, w, d, n, s0, s1 = line.split()
h = int(h)
w = int(w)
d = int(d)
n = int(n)
s0 = int(s0)
s1 = int(s1)
layer = Convolution(filtersize=(h, w, d, n),
stride=(s0, s1))
layer.W = np.array([
float(weightstring)
for weightstring in content[c + 1].split()
if len(weightstring) > 0
]).reshape((h, w, d, n))
layer.B = np.array([
float(weightstring)
for weightstring in content[c + 2].split()
if len(weightstring) > 0
])
modules.append(layer)
c += 3 #the description of a convolution layer spans three lines
elif line.startswith(
SumPool.__name__
): # @UndefinedVariable import error suppression for PyDev users
'''
Format of sum pooling layer
SumPool <mask_heigth> <mask_width> <stride_axis_0> <stride_axis_1>
'''
_, h, w, s0, s1 = line.split()
h = int(h)
w = int(w)
s0 = int(s0)
s1 = int(s1)
layer = SumPool(pool=(h, w), stride=(s0, s1))
modules.append(layer)
c += 1 # one line of parameterized layer description
elif line.startswith(
MaxPool.__name__
): # @UndefinedVariable import error suppression for PyDev users
'''
Format of max pooling layer
MaxPool <mask_heigth> <mask_width> <stride_axis_0> <stride_axis_1>
'''
_, h, w, s0, s1 = line.split()
h = int(h)
w = int(w)
s0 = int(s0)
s1 = int(s1)
layer = MaxPool(pool=(h, w), stride=(s0, s1))
modules.append(layer)
c += 1 # one line of parameterized layer description
elif line.startswith(
Flatten.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(Flatten())
c += 1 #one line of parameterless layer description
elif line.startswith(
Rect.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(Rect())
c += 1 #one line of parameterless layer description
elif line.startswith(
Tanh.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(Tanh())
c += 1 #one line of parameterless layer description
elif line.startswith(
SoftMax.__name__
): # @UndefinedVariable import error suppression for PyDev users
modules.append(SoftMax())
c += 1 #one line of parameterless layer description
else:
raise ValueError(
'Layer type identifier' +
[s for s in line.split() if len(s) > 0][0] +
' not supported for reading from plain text file')
#skip info of previous layers, read in next layer header
line = content[c]
return Sequential(modules)
# data = np.load('mnist.npz',)
with np.load('mnist.npz', 'r', allow_pickle=True) as data:
X = data['X']
y = data['y']
else:
X, y = fetch_openml('mnist_784', version=1, return_X_y=True)
# X, y = mnist.data / 255.0, mnist.target
np.savez('mnist.npz', X=X, y=y)
print("data shape:", X.shape, y.shape)
X, Y = X / 255, one_hot(y)
train_x, test_x, train_y, test_y = X[:60000], X[60000:], Y[:60000], Y[60000:]
#### build model
net = Sequential()
net.add(Dense(784, 400))
net.add(ReLU())
# net.add(Sigmoid())
# net.add(SoftPlus())
# net.add(Dropout())
net.add(Dense(400, 128))
net.add(ReLU())
# net.add(BatchMeanSubtraction())
# net.add(ReLU())
# net.add(Dropout())
net.add(Dense(128, 10))
net.add(SoftMax())
# criterion = MultiLabelCriterion() # loss function
criterion = CrossEntropyCriterion()
# ----- Define the paramters for learning -----
nb_classes = train_labels.shape[0]
features = train_features.size(1)
nb_samples = train_features.size(0)
epsilon = 0.1
eta = .2 #nb_samples is now defined in Sequential()
batch_size = config.batch_size
epochs = int(config.epochs / (nb_samples / batch_size))
# Zeta is to make it work correctly with Sigma activation function.
# train_label = train_label.add(0.125).mul(0.8)
# test_label = test_label.add(0.125).mul(0.8)
# ----- Implementation of the architecture -----
architecture = Sequential(Linear(2, 25, ReLU()), Linear(25, 25, ReLU()),
Linear(25, 25, ReLU()), Linear(25, 2, Sigma()))
# ----- Training -----
round = 1
prev_loss = math.inf
prev_prev_loss = math.inf
errors = []
for epoch in range(epochs):
for batch_start in range(0, nb_samples, batch_size):
features = train_features[batch_start:batch_start + batch_size, :]
labels = train_labels[batch_start:batch_start + batch_size]
tr_loss, tr_error = architecture.forward(train_features, train_labels)
architecture.backward()
architecture.update(eta)
loss, error = architecture.forward(test_features, test_labels)
print(' --- Epoch ', round, ' Test Loss: ', loss.item(), '---',
def test_Sequential(self):
np.random.seed(42)
torch.manual_seed(42)
batch_size, n_in = 2, 4
for _ in range(100):
# layers initialization
alpha = 0.9
torch_layer = torch.nn.BatchNorm1d(n_in,
eps=BatchNormalization.EPS,
momentum=1. - alpha,
affine=True)
torch_layer.bias.data = torch.from_numpy(
np.random.random(n_in).astype(np.float32))
custom_layer = Sequential()
bn_layer = BatchNormalization(alpha)
bn_layer.moving_mean = torch_layer.running_mean.numpy().copy()
bn_layer.moving_variance = torch_layer.running_var.numpy().copy()
custom_layer.add(bn_layer)
scaling_layer = ChannelwiseScaling(n_in)
scaling_layer.gamma = torch_layer.weight.data.numpy()
scaling_layer.beta = torch_layer.bias.data.numpy()
custom_layer.add(scaling_layer)
custom_layer.train()
layer_input = np.random.uniform(-5, 5, (batch_size, n_in)).astype(
np.float32)
next_layer_grad = np.random.uniform(
-5, 5, (batch_size, n_in)).astype(np.float32)
# 1. check layer output
custom_layer_output = custom_layer.updateOutput(layer_input)
layer_input_var = Variable(torch.from_numpy(layer_input),
requires_grad=True)
torch_layer_output_var = torch_layer(layer_input_var)
self.assertTrue(
np.allclose(torch_layer_output_var.data.numpy(),
custom_layer_output,
atol=1e-6))
# 2. check layer input grad
custom_layer_grad = custom_layer.backward(layer_input,
next_layer_grad)
torch_layer_output_var.backward(torch.from_numpy(next_layer_grad))
torch_layer_grad_var = layer_input_var.grad
self.assertTrue(
np.allclose(torch_layer_grad_var.data.numpy(),
custom_layer_grad,
atol=1e-5))
# 3. check layer parameters grad
weight_grad, bias_grad = custom_layer.getGradParameters()[1]
torch_weight_grad = torch_layer.weight.grad.data.numpy()
torch_bias_grad = torch_layer.bias.grad.data.numpy()
self.assertTrue(
np.allclose(torch_weight_grad, weight_grad, atol=1e-6))
self.assertTrue(np.allclose(torch_bias_grad, bias_grad, atol=1e-6))
nn = NN2(X.shape[1], 30, Y.shape[1])
optim_nn = LossMSE()
trainer = Trainer(nn, optim_nn, v=True)
iterations = 200
eta = 0.0001
# In[16]:
cost_nn = trainer.trainBatchGD(X, Y, iterations, eta=eta)
plotCostAndData(nn, X, Y, cost_nn)
# ### Sequential
# In[18]:
nn_seq = Sequential(Linear(D_in, H1), Tanh(), Linear(H1, H2), Tanh(),
Linear(H2, D_out))
optim_nn = LossMSE()
trainer = Trainer(nn_seq, optim_nn, v=True)
iterations = 300
eta = 0.0008
nn_seq.modules
# In[19]:
cost_nn_seq = trainer.trainBatchGD(X, Y, iterations, eta=eta)
plotCostAndData(nn_seq, X, Y, cost_nn_seq)
# ## Circular input
# In[248]:
###############################
# Use this example to debug your code, start with logistic regression and then
# test other layers. You do not need to change anything here. This code is
# provided for you to test the layers. Next you will use similar code in MNIST task.
###############################
###############################
#### generate_data
X, Y = generate_two_classes(500)
print("Data dimenstions: ", X.shape, Y.shape)
# plt.scatter(X[:,0], X[:,1], c=Y.argmax(axis=-1))
# plt.show()
###############################
#### build model
net = Sequential()
net.add(Dense(2, 4))
net.add(ReLU())
net.add(Dense(4, 2))
net.add(SoftMax())
criterion = MSECriterion() # loss function
# Optimizer params
optimizer_config = {'learning_rate': 1e-2, 'momentum': 0.9}
optimizer_state = {}
# Looping params
n_epoch = 20
batch_size = 128
"""This file declares the models to be used for testing."""
from modules import Sequential, Linear, ReLU, Tanh, Sigmoid
MODEL1 = Sequential("ReLu", Linear(2, 25), ReLU(), Linear(25, 25), ReLU(),
Linear(25, 25), ReLU(), Linear(25, 2), Sigmoid())
MODEL2 = Sequential("Tanh", Linear(2, 25), Tanh(), Linear(25, 25), Tanh(),
Linear(25, 25), Tanh(), Linear(25, 2), Sigmoid())
MODEL3 = Sequential("ReLu + He", Linear(2, 25, "He"), ReLU(),
Linear(25, 25, "He"), ReLU(), Linear(25, 25, "He"), ReLU(),
Linear(25, 2, "He"), Sigmoid())
MODEL4 = Sequential("Tanh + Xavier", Linear(2, 25, "Xavier"), Tanh(),
Linear(25, 25, "Xavier"), Tanh(), Linear(25, 25, "Xavier"),
Tanh(), Linear(25, 2, "Xavier"), Sigmoid())
# Best model is actually almost model 2
MODEL_BEST = Sequential("Best", Linear(2, 25), Tanh(), Linear(25, 25), Tanh(),
Linear(25, 25), Tanh(), Linear(25, 2, "He"), Sigmoid())
test_errors = []
for n in range(nb_tries):
print("Try: " + str(n + 1))
modules = [
Linear(2, nb_hidden),
eLU(),
Linear(nb_hidden, nb_hidden),
ReLU(),
Linear(nb_hidden, nb_hidden),
LeakyReLU(0.01),
Linear(nb_hidden, 2),
Tanh()
]
model = Sequential(modules)
losses, train_errors, validation_errors = train_model(
model, train_input, train_target, validation_input, validation_target,
nb_epochs, mini_batch_size, learning_rate, 0, None, 'Adadelta', 'MSE')
nb_test_errors, test_misclassified = compute_nb_errors(
model, test_input, test_target, mini_batch_size)
print('Test error: {:0.2f}% ({:d}/{:d})'.format(
(100 * nb_test_errors) / test_input.size(0), nb_test_errors,
test_input.size(0)))
test_errors.append((100 * nb_test_errors) / test_input.size(0))
# Plots
#plot_loss_errors(nb_epochs, losses, train_errors, validation_errors)
#plot_targets_misclassifications(test_input_not_normalized, test_target, test_misclassified)
# Mean and standard deviation of the model test errors over all the tries
###############################
# Use this example to debug your code, start with logistic regression and then
# test other layers. You do not need to change anything here. This code is
# provided for you to test the layers. Next you will use similar code in MNIST task.
###############################
###############################
#### generate_data
X, Y = generate_spirale(500, 3)
print("Data dimenstions: ", X.shape, Y.shape)
plt.scatter(X[:, 0], X[:, 1], c=Y.argmax(axis=-1))
plt.show()
###############################
#### build model
net = Sequential()
net.add(Dense(2, 40))
# net.add(Dropout())
# net.add(BatchMeanSubtraction())
net.add(ReLU())
net.add(Dense(40, 40))
# net.add(Tanh())
net.add(ReLU())
# net.add(Dropout())
net.add(Dense(40, 3))
net.add(SoftMax())
# criterion = MultiLabelCriterion() # loss function
criterion = CrossEntropyCriterion()
###############################
#### optimizer config
target = torch.zeros((nb, 2))
target[(input - 0.5).pow(2).sum(1) < 0.5 / pi, 1] = 1
target[(input - 0.5).pow(2).sum(1) >= 0.5 / pi, 0] = 1
return input, target
train_input, train_target = generate_disc_set(1000)
test_input, test_target = generate_disc_set(1000)
batch_size = 100
num_batches = len(train_input) // batch_size
# Reset the seeds before each model creation so that
# parameters are initialized the same for a fair comparison.
torch.manual_seed(0)
relu = Sequential(Linear(2, 25), ReLU(), Linear(25, 25), ReLU(),
Linear(25, 25), ReLU(), Linear(25, 2))
torch.manual_seed(0)
tanh = Sequential(Linear(2, 25), Tanh(), Linear(25, 25), Tanh(),
Linear(25, 25), Tanh(), Linear(25, 2))
criterion = MSE()
def fit(model):
optimizer = SGD(model.parameters(), model.grads(), lr=0.1)
losses = []
print('Epoch | Loss')
for epoch in range(500):
epoch_loss = 0
optimizer = adam_optimizer
optimizer_config = {
'learning_rate': 1e-2,
'beta1': 9e-1,
'beta2': 999e-3,
'epsilon': 10e-8
}
optimizer_state = {}
# Looping params
n_epoch = 20
batch_size = 1024
for activation_name, activation in activations.items():
nn1 = Sequential()
nn1.add(Dense(784, 100))
nn1.add(activation())
nn1.add(Dense(100, 50))
nn1.add(activation())
nn1.add(Dense(50, 10))
nn1.add(SoftMax())
print("****************************************************")
print(f"Training NN with {activation_name} without Batch Normalization")
print("****************************************************")
loss_history1 = fit(X_train, y_train, X_val, y_val, nn1, n_epoch,
batch_size, criterion, optimizer, optimizer_config,
optimizer_state)