def test_fullyConnectedLayer():
'''
Test that the fully connected layer works. This trains sine function
for a FCNN with one hidden layer of 4 units. For visualization check test.py.
NOTE: Activations are done out of FC layer, since for atomic calculations
linear activation is used.
'''
pi=3.14159265358
xtrain=np.linspace(0,7,300)
ytrain=np.sin(xtrain)
Xtrain=np.zeros((300,1))
for i in range(300):
Xtrain[i]=xtrain[i]
Ytrain=np.sin(Xtrain)
rng = np.random.RandomState(23455)
x=T.matrix('x')
y=T.matrix('y')
[hout, params_1] = cnn.fullyConnectedLayer(
rng=rng,
data_input=x,
num_in=1,
num_out=4)
[y_pred_lin, params_2] = cnn.fullyConnectedLayer(
rng=rng,
data_input=T.tanh(hout),
num_in=4,
num_out=1)
y_pred=T.tanh(y_pred_lin)
cost=cnn.MSE(y,y_pred)
params = params_1 + params_2
updates = cnn.gradient_updates_Adam(cost,params,0.05)
train = theano.function(
inputs=[x,y],
outputs=[cost],
updates=updates)
for i in range(2000):
cost_i=train(Xtrain,Ytrain)
assert cost_i[0] < 0.015
def CNNStructure(input, mini_batch_size, rng):
# Use: hyppar module
Nchannel = hyppar.Nchannel
NCL = hyppar.NCL
NFC = hyppar.NFC
pool = hyppar.pool
filter = hyppar.filter
activation = hyppar.activation
image_spec_x = hyppar.image_spec_x
image_spec_y = hyppar.image_spec_y
activation_function = []
for i in range(NCL):
if (activation[i] == "tanh"):
activation_function.append(T.tanh)
elif (activation[i] == "relu"):
activation_function.append(T.nnet.relu)
elif (activation[i] == "elu"):
activation_function.append(T.nnet.elu)
elif (activation[i] == "sigmoid"):
activation_function.append(T.nnet.sigmoid)
else:
print(str(i + 1) + ": UNKNOWN ACTIVATION!!!!!!!!")
# THIS IS NOT YET IMPLEMENTED TO FCL
if (hyppar.fc_activation == "tanh"):
fc_activation = T.tanh
elif (hyppar.fc_activation == "relu"):
fc_activation = T.nnet.relu
elif (hyppar.fc_activation == "elu"):
fc_activation = T.nnet.elu
elif (hyppar.fc_activation == "sigmoid"):
fc_activation = T.nnet.sigmoid
#else :
# print("FC: UNKNOWN ACTIVATION!!!!!!!!")
cn_output = []
params = []
# This is the loop of the convolutions
for i in range(NCL):
[layer_output, layer_params
] = cnn.convLayer(rng,
data_input=input,
image_spec=(mini_batch_size, 1, image_spec_x[i],
image_spec_y[i]),
filter_spec=(Nchannel[i + 1], Nchannel[i],
filter[i][0], filter[i][1]),
pool_size=(pool[i][0], pool[i][1]),
activation=activation_function[i])
cn_output = cn_output + [layer_output]
params = params + layer_params
input = layer_output
fc_layer_input = layer_output.flatten(2)
# The fully connected layer operates on a matrix of
[E_pred, fc_layer_params] = cnn.fullyConnectedLayer(
rng=rng,
data_input=fc_layer_input,
num_in=Nchannel[NCL] * image_spec_x[-1] * image_spec_y[-1],
num_out=1)
params = params + fc_layer_params
return E_pred, cn_output, params
def visualize_MISTtraining():
'''
A function to demonstrate how convolutional and fully
connected layers are used to train CNN to learn to label MNIST
digits.
Same function is used in testing, without any output.
Downloads data from online, if mnist zip file is dot present.
More plotting features and such should be included, now only
terminal output.
Benchmark error on test set with current settings: 0.0445
'''
dataset = 'mnist.pkl.gz'
data_dir, data_file = os.path.split(dataset)
rd.seed(23455)
# Check if data file present
if data_dir == "" and not os.path.isfile(dataset):
new_path = os.path.join('', dataset)
if os.path.isfile(new_path) or data_file == 'mnist.pkl.gz':
dataset = new_path
# Download the file from MILA if not present
if (not os.path.isfile(dataset)) and data_file == 'mnist.pkl.gz':
from six.moves import urllib
origin = (
'http://www.iro.umontreal.ca/~lisa/deep/data/mnist/mnist.pkl.gz')
print('Downloading data from %s' % origin)
urllib.request.urlretrieve(origin, dataset)
print('***** Loading data *****')
# Open the file
with gzip.open(dataset, 'rb') as f:
try:
train_set, valid_set, test_set = pickle.load(f, encoding='latin1')
except:
train_set, valid_set, test_set = pickle.load(f)
train_x, train_y = train_set
valid_x, valid_y = valid_set
test_x, test_y = test_set
# Load data into tensors
train_size = 6000
test_set_x, test_set_y_float, test_set = load_data.shared_dataset(
test_x, test_y, sample_size=train_size // 3)
valid_set_x, valid_set_y_float, valid_set = load_data.shared_dataset(
valid_x, valid_y, sample_size=train_size // 3)
train_set_x, train_set_y_float, train_set = load_data.shared_dataset(
train_x, train_y, sample_size=train_size)
train_set_y = T.cast(train_set_y_float, 'int32')
valid_set_y = T.cast(valid_set_y_float, 'int32')
test_set_y = T.cast(test_set_y_float, 'int32')
# Training set dimension: 6000 x 784
print('Training set: %d samples' %
(train_set_x.get_value(borrow=True).shape[0]))
# Test set dimension: 2000 x 784
print('Test set: %d samples' %
(test_set_x.get_value(borrow=True).shape[0]))
# Validation set dimension: 2000 x 784
print('Validation set: %d samples' %
(valid_set_x.get_value(borrow=True).shape[0]))
print('The training set looks like this: ')
print(train_set[0])
print('The labels looks like this:')
print(train_set[1])
# set learning rate used for Stochastic Gradient Descent
learning_rate = 0.005
# set number of training epochs
num_epochs = 4
# set number of kernels for each convolution layer
# for e.g. 2 layers - [20, 50]. layer1 = 20, layer2 = 50
num_filters = [9]
# set mini-batch size to be used
mini_batch_size = 50
# Seeding the random number generator
rng = np.random.RandomState(23455)
# Computing number of mini-batches
n_train_batches = train_set_x.get_value(borrow=True).shape[0]
n_valid_batches = valid_set_x.get_value(borrow=True).shape[0]
n_test_batches = test_set_x.get_value(borrow=True).shape[0]
n_train_batches //= mini_batch_size
n_valid_batches //= mini_batch_size
n_test_batches //= mini_batch_size
print('train: %d batches, test: %d batches, validation: %d batches' %
(n_train_batches, n_test_batches, n_valid_batches))
# mini-batch index
mb_index = T.lscalar()
# rasterised images
x = T.matrix('x')
# image labels
y = T.ivector('y')
print('***** Constructing model ***** ')
# Reshaping matrix of mini_batch_size set of images into a
# 4-D tensor of dimensions: mini_batch_size x 1 x 28 x 28
layer0_input = x.reshape((mini_batch_size, 1, 28, 28))
# First convolution and pooling layer
# 4D output tensor is of shape:
# mini_batch_size x 9 x 12 x 12
[layer0_output,
layer0_params] = cnn.convLayer(rng,
data_input=layer0_input,
image_spec=(mini_batch_size, 1, 28, 28),
filter_spec=(num_filters[0], 1, 5, 5),
pool_size=(2, 2),
activation=T.tanh)
# Flatten the output into dimensions:
# mini_batch_size x 1296
fc_layer_input = layer0_output.flatten(2)
# The fully connected layer operates on a matrix of
# dimensions: mini_batch_size x 1296
# It clasifies the values using the softmax function.
[y_lin, fc_layer_params
] = cnn.fullyConnectedLayer(rng,
data_input=fc_layer_input,
num_in=num_filters[0] * 12 * 12,
num_out=10)
# The likelihood of the categories
p_y_given_x = T.nnet.softmax(y_lin)
# Predictions
y_pred = T.argmax(p_y_given_x, axis=1)
# Cost that is minimised during stochastic descent.
cost = negative_log_lik(y=y, p_y_given_x=p_y_given_x)
# Creates a Theano function that computes the mistakes on the validation set.
# This performs validation.
# Note: the givens parameter allows us to separate the description of the
# Theano model from the exact definition of the inputs variable. The 'key'
# that is passed to the graph is subsituted with the data from the givens
# parameter. In this demo we built the model with a regular Theano tensor
# and we use givens to speed up the GPU. We swap the input index with a
# slice corresponding to the mini-batch of the dataset to use.
# mb_index is the mini_batch_index
valid_model = theano.function(
[mb_index],
errors(y, y_pred),
givens={
x:
valid_set_x[mb_index * mini_batch_size:(mb_index + 1) *
mini_batch_size],
y:
valid_set_y[mb_index * mini_batch_size:(mb_index + 1) *
mini_batch_size]
})
# Create a Theano function that computes the mistakes on the test set.
# This evaluated our model's accuracy.
test_model = theano.function(
[mb_index],
errors(y, y_pred),
givens={
x:
test_set_x[mb_index * mini_batch_size:(mb_index + 1) *
mini_batch_size],
y:
test_set_y[mb_index * mini_batch_size:(mb_index + 1) *
mini_batch_size]
})
# List of parameters to be fit during training
params = fc_layer_params + layer0_params
# Creates a list of gradients
grads = T.grad(cost, params)
# Creates a function that updates the model parameters by SGD.
# The updates list is created by looping over all
# (params[i], grads[i]) pairs.
#updates = [(param_i, param_i - learning_rate * grad_i)
# for param_i, grad_i in zip(params, grads)]
updates = cnn.gradient_updates_Adam(cost, params, learning_rate)
# Create a Theano function to train our convolutional neural network.
train_model = theano.function(
[mb_index],
cost,
updates=updates,
givens={
x:
train_set_x[mb_index * mini_batch_size:(mb_index + 1) *
mini_batch_size],
y:
train_set_y[mb_index * mini_batch_size:(mb_index + 1) *
mini_batch_size]
})
# Some code to help with the plotting.
# You don't need to go through the plotting
# code in detail.
iter = 0
epoch = 0
cost_ij = 0
train_costs = []
valid_accuracy = []
# This is where we call the previously defined Theano functions.
print('***** Training model *****')
while (epoch < num_epochs):
print('epoch: ' + str(epoch))
epoch = epoch + 1
for minibatch_index in range(n_train_batches):
# Compute number of iterations performed or total number
# of mini-batches executed.
iter = (epoch - 1) * n_train_batches + minibatch_index
# Perform the training of our convolution neural network.
# Obtain the cost of each minibatch specified using the
# minibatch_index.
cost_ij = train_model(minibatch_index)
print('iter: ' + str(iter) + ', cost_ij: ' + str(cost_ij))
train_costs.append(cost_ij)
# Compute the prediction error on each validation mini-batch by
# calling the previously defined Theano
valid_losses = [valid_model(i) for i in range(n_valid_batches)]
# Compute the mean prediction error across all the mini-batches.
valid_score = np.mean(valid_losses)
valid_accuracy.append(valid_score)
print('***** Training Complete *****')
test_losses = [test_model(i) for i in range(n_test_batches)]
# Compute the mean prediction error across all the mini-batches.
test_score = np.mean(test_losses)
print('Accuracy on the test set: ' + str(test_score))
fig, (ax1, ax2) = plt.subplots(2)
ax1.plot(train_costs)
ax2.plot(valid_accuracy)
plt.show()
def visualize_sinetraining(Npoints, Nnodes, Nsteps, learning_rate):
pi = 3.14159265358
xtrain = np.linspace(0, 7, Npoints)
ytrain = np.sin(xtrain)
Xtrain = np.zeros((Npoints, 1))
for i in range(Npoints):
Xtrain[i] = xtrain[i]
Ytrain = np.sin(Xtrain)
rng = np.random.RandomState(23455)
x = T.matrix('x')
y = T.matrix('y')
[hout, params_1] = cnn.fullyConnectedLayer(rng=rng,
data_input=x,
num_in=1,
num_out=Nnodes)
[y_pred_lin, params_2] = cnn.fullyConnectedLayer(rng=rng,
data_input=T.tanh(hout),
num_in=Nnodes,
num_out=1)
y_pred = T.tanh(y_pred_lin)
cost = cnn.MSE(y, y_pred)
params = params_1 + params_2
updates = cnn.gradient_updates_Adam(cost, params, learning_rate)
train = theano.function(inputs=[x, y],
outputs=[y_pred, cost, hout],
updates=updates)
plt.ion()
fig = plt.figure()
ax1 = fig.add_subplot(311)
ax2 = fig.add_subplot(312)
ax3 = fig.add_subplot(313)
ax1.plot(xtrain, ytrain)
#plt.ion()
ax1.plot(xtrain, ytrain, 'b-')
errors = []
for i in range(Nsteps):
pred, cost_i, hout = train(Xtrain, Ytrain)
if (i % 20 == 0):
ax1.clear()
line11, = ax1.plot(xtrain, ytrain, 'b--', label='Inline label')
line12, = ax1.plot(Xtrain, pred, 'r-', label='Inline label')
line11.set_label('Training data')
line12.set_label('prediction')
ax1.legend()
ax1.set_title('Prediction')
errors.append(cost_i)
ax3.clear()
line31, = ax3.plot(errors, 'r-+', label='Inline label')
ax3.set_title('Error')
line31.set_label(str(cost_i))
ax3.legend()
ax2.clear()
houtbout = T.tanh(hout)
ax2.plot(Xtrain, houtbout)
ax2.set_title('Activations')
fig.canvas.draw()
plt.pause(0.05)
fig.canvas.draw()
print('Final error: ' + str(cost_i))
def test_convLayer():
'''
Constructs a CNN with one convolutional and one fully connected layer.
Then the function trains the network to interpret MNIST digits. Same
script with some output and plotting features is found from "test.py".
Calls two functions for cost and accuracy from above.
Test: digit labeling accuracy > 92%
NOTE: Valid set is not present here.
'''
dataset = 'mnist.pkl.gz'
data_dir, data_file = os.path.split(dataset)
rd.seed(23455)
# Check if data file present
if data_dir == "" and not os.path.isfile(dataset):
new_path = os.path.join('', dataset)
if os.path.isfile(new_path) or data_file == 'mnist.pkl.gz':
dataset = new_path
# Download the file from MILA if not present
if (not os.path.isfile(dataset)) and data_file == 'mnist.pkl.gz':
from six.moves import urllib
origin = (
'http://www.iro.umontreal.ca/~lisa/deep/data/mnist/mnist.pkl.gz'
)
print('Downloading data from %s' % origin)
urllib.request.urlretrieve(origin, dataset)
print('***** Loading data *****')
# Open the file
with gzip.open(dataset, 'rb') as f:
try:
train_set, valid_set, test_set = pickle.load(f, encoding='latin1')
except:
train_set, valid_set, test_set = pickle.load(f)
train_x,train_y=train_set
test_x,test_y=test_set
# Load data into tensors
train_size = 6000
test_set_x, test_set_y_float, test_set = load_data.shared_dataset(
test_x,test_y,
sample_size=train_size//3
)
train_set_x, train_set_y_float, train_set = load_data.shared_dataset(
train_x,train_y,
sample_size=train_size
)
train_set_y=T.cast(train_set_y_float,'int32')
test_set_y=T.cast(test_set_y_float,'int32')
# set learning rate used for Stochastic Gradient Descent
learning_rate = 0.005
# set number of training epochs
num_epochs = 4
# set number of kernels for each convolution layer
# for e.g. 2 layers - [20, 50]. layer1 = 20, layer2 = 50
num_filters = [9]
# set mini-batch size to be used
mini_batch_size = 50
# Seeding the random number generator
rng = np.random.RandomState(23455)
# Computing number of mini-batches
n_train_batches = train_set_x.get_value(borrow=True).shape[0]
n_test_batches = test_set_x.get_value(borrow=True).shape[0]
n_train_batches //= mini_batch_size
n_test_batches //= mini_batch_size
# mini-batch index
mb_index = T.lscalar()
# rasterised images
x = T.matrix('x')
# image labels
y = T.ivector('y')
# Reshaping matrix of mini_batch_size set of images into a
# 4-D tensor of dimensions: mini_batch_size x 1 x 28 x 28
layer0_input = x.reshape((mini_batch_size, 1, 28, 28))
# First convolution and pooling layer
# 4D output tensor is of shape:
# mini_batch_size x 9 x 12 x 12
[layer0_output, layer0_params] = cnn.convLayer(
rng,
data_input=layer0_input,
image_spec=(mini_batch_size, 1, 28, 28),
filter_spec=(num_filters[0], 1, 5, 5),
pool_size=(2, 2),
activation=T.tanh)
# Flatten the output into dimensions:
# mini_batch_size x 1296
fc_layer_input = layer0_output.flatten(2)
# The fully connected layer operates on a matrix of
# dimensions: mini_batch_size x 1296
# It clasifies the values using the softmax function.
[y_lin, fc_layer_params] = cnn.fullyConnectedLayer(
rng,
data_input=fc_layer_input,
num_in=num_filters[0]*12*12,
num_out=10)
# The likelihood of the categories
p_y_given_x = T.nnet.softmax(y_lin)
# Predictions
y_pred = T.argmax(p_y_given_x,axis=1)
# Cost that is minimised during stochastic descent.
cost = negative_log_lik(y=y, p_y_given_x=p_y_given_x)
# Create a Theano function that computes the mistakes on the test set.
# This evaluated our model's accuracy.
test_model = theano.function(
[mb_index],
errors(y, y_pred),
givens={
x: test_set_x[
mb_index * mini_batch_size:
(mb_index + 1) * mini_batch_size
],
y: test_set_y[
mb_index * mini_batch_size:
(mb_index + 1) * mini_batch_size
]})
# List of parameters to be fit during training
params = fc_layer_params + layer0_params
updates = cnn.gradient_updates_Adam(cost,params,learning_rate)
# Create a Theano function to train our convolutional neural network.
train_model = theano.function(
[mb_index],
cost,
updates=updates,
givens={
x: train_set_x[
mb_index * mini_batch_size:
(mb_index + 1) * mini_batch_size
],
y: train_set_y[
mb_index * mini_batch_size:
(mb_index + 1) * mini_batch_size
]})
iter = 0
epoch = 0
cost_ij = 0
# This is where we call the previously defined Theano functions.
while (epoch < num_epochs):
epoch = epoch + 1
for minibatch_index in range(n_train_batches):
cost_ij = train_model(minibatch_index)
test_losses = [test_model(i) for i in range(n_test_batches)]
test_score = np.mean(test_losses)
assert test_score < 0.08