def __init__(self, size, hidden_layer_size, denoise = False, denoise_percent = 0.3, contractive = False):
thetas = neur.create_initial_thetas([size, hidden_layer_size, size], 0.1)
self.encode_weights = thetas[0]
self.decode_weights = thetas[1]
self.denoise = denoise
self.corrupt = denoise_percent
self.contractive = contractive
def autoencoder_example():
mnist_train = np.fromfile('mnist_training.csv', sep=" ")
mnist_train = np.array(mnist_train.reshape(256, 1000)).transpose()
mnist_targets = np.fromfile('mnist_training_targets.csv', sep=" ")
mnist_targets = np.array(mnist_targets.reshape(10, 1000)).transpose()
X = mnist_train
y = mnist_targets
X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "digits_rbm_mnist_autoencode")
X_val = np.vstack([X_val, X_test])
y_val = np.vstack([y_val, y_test])
hid_layer = 300
autoenc = ac.Autoencoder(X.shape[1], hid_layer, denoise = True, denoise_percent = 0.5)
costs, val_costs = autoenc.optimize(X, iters = 1500, learning_rate = 0.1, val_set = X_val)
print "::: first encoding done :::"
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()
thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
thetas[0] = autoenc.encode_weights
thetas, costs, val_costs = neur.gradient_decent(X, y,
learning_rate = 0.01,
hidden_layer_sz = hid_layer,
iter = 5000,
thetas = thetas,
X_val = X_val,
y_val = y_val,
do_dropout = True,
dropout_percentage = 0.9,
do_early_stopping = True)
h_x, a = neur.forward_prop(X_val, thetas)
print "percentage correct predictions: ", ut.percent_equal(ut.map_to_max_binary_result(h_x), y_val)
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()
def rbm_example():
digits = datasets.load_digits()
X = digits.images.reshape((digits.images.shape[0], -1))
X = (X / 16.0)
y = ut.all_to_sparse(digits.target, max(digits.target) + 1)
X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
np.array(X), np.array(y), "digits_rbm", True)
X_val = np.vstack([X_val, X_test])
y_val = np.vstack([y_val, y_test])
hid_layer = 300
bm = rbm.RBM(64, hid_layer)
#exit()
costs = bm.optimize(neur.mini_batch_generator(X), 2000, 0.08)
print "validate squared_error", bm.validate(X_val)
#exit()
filename = './random_set_cache/data_rbm_run.pkl'
first_layer_weights = np.hstack([np.zeros((hid_layer, 1)), bm.weights])
#pickle.dump(first_layer_weights, open(filename, 'w'))
# first_layer_weights = pickle.load(open(filename, 'r'))
thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
thetas[0] = first_layer_weights
thetas, costs, val_costs = neur.gradient_decent_gen(
izip(neur.mini_batch_generator(X, 10),
neur.mini_batch_generator(y, 10)),
learning_rate=0.05,
hidden_layer_sz=hid_layer,
iter=8000,
thetas=thetas,
X_val=X_val,
y_val=y_val,
do_early_stopping=True)
h_x, a = neur.forward_prop(X_test, thetas)
print "percentage correct predictions: ", ut.percent_equal(
ut.map_to_max_binary_result(h_x), y_test)
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()
def rbm_example():
digits = datasets.load_digits()
X = digits.images.reshape((digits.images.shape[0], -1))
X = (X / 16.0)
y = ut.all_to_sparse( digits.target, max(digits.target) + 1 )
X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "digits_rbm", True)
X_val = np.vstack([X_val, X_test])
y_val = np.vstack([y_val, y_test])
hid_layer = 300
bm = rbm.RBM(64, hid_layer)
#exit()
costs = bm.optimize(neur.mini_batch_generator(X), 2000, 0.08)
print "validate squared_error", bm.validate(X_val)
#exit()
filename = './random_set_cache/data_rbm_run.pkl'
first_layer_weights = np.hstack([np.zeros((hid_layer,1)), bm.weights])
#pickle.dump(first_layer_weights, open(filename, 'w'))
# first_layer_weights = pickle.load(open(filename, 'r'))
thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
thetas[0] = first_layer_weights
thetas, costs, val_costs = neur.gradient_decent_gen(izip(neur.mini_batch_generator(X, 10),
neur.mini_batch_generator(y, 10)),
learning_rate = 0.05,
hidden_layer_sz = hid_layer,
iter = 8000,
thetas = thetas,
X_val = X_val,
y_val = y_val,
do_early_stopping = True)
h_x, a = neur.forward_prop(X_test, thetas)
print "percentage correct predictions: ", ut.percent_equal(ut.map_to_max_binary_result(h_x), y_test)
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()
def rbm_mnist_example():
mnist_train = np.fromfile('mnist_training.csv', sep=" ")
mnist_train = np.array(mnist_train.reshape(256, 1000)).transpose()
mnist_targets = np.fromfile('mnist_training_targets.csv', sep=" ")
mnist_targets = np.array(mnist_targets.reshape(10, 1000)).transpose()
X = mnist_train
y = mnist_targets
X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(np.array(X), np.array(y), "digits_rbm_mnist")
X_val = np.vstack([X_val, X_test])
y_val = np.vstack([y_val, y_test])
hid_layer = 300
bm = rbm.RBM(256, hid_layer)
#exit()
costs = bm.optimize(X, 1000, 0.2, val_set = X_val)
X = bm.prop_up(X)
X_val = bm.prop_up(X_val)
bm2 = rbm.RBM(hid_layer, hid_layer + 50)
costs = bm2.optimize(X, 600, 0.2, val_set = X_val)
X = bm2.prop_up(X)
X_val = bm2.prop_up(X_val)
bm3 = rbm.RBM(hid_layer + 50, hid_layer)
costs = bm3.optimize(X, 600, 0.2, val_set = X_val)
# lets change X
filename = './random_set_cache/data_rbm_run_without_bias.pkl'
first_layer_weights = np.hstack([np.zeros((hid_layer,1)), bm3.weights]) # without bias
#first_layer_weights = np.hstack([bm.hidden_bias.reshape(hid_layer, 1), bm.weights]) # with bias
#pickle.dump(first_layer_weights, open(filename, 'w'))
#exit()
#first_layer_weights = pickle.load(open(filename, 'r'))
thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
thetas[0] = first_layer_weights
thetas, costs, val_costs = neur.gradient_decent(X, y,
learning_rate = 0.1,
hidden_layer_sz = hid_layer,
iter = 3000,
thetas = thetas,
X_val = X_val,
y_val = y_val,
do_dropout = True,
dropout_percentage = 0.7,
do_early_stopping = True)
h_x, a = neur.forward_prop(X_val, thetas)
print "percentage correct predictions: ", ut.percent_equal(ut.map_to_max_binary_result(h_x), y_val)
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()
def rbm_mnist_example():
mnist_train = np.fromfile('mnist_training.csv', sep=" ")
mnist_train = np.array(mnist_train.reshape(256, 1000)).transpose()
mnist_targets = np.fromfile('mnist_training_targets.csv', sep=" ")
mnist_targets = np.array(mnist_targets.reshape(10, 1000)).transpose()
X = mnist_train
y = mnist_targets
X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
np.array(X), np.array(y), "digits_rbm_mnist")
X_val = np.vstack([X_val, X_test])
y_val = np.vstack([y_val, y_test])
hid_layer = 300
bm = rbm.RBM(256, hid_layer)
#exit()
costs = bm.optimize(X, 1000, 0.2, val_set=X_val)
X = bm.prop_up(X)
X_val = bm.prop_up(X_val)
bm2 = rbm.RBM(hid_layer, hid_layer + 50)
costs = bm2.optimize(X, 600, 0.2, val_set=X_val)
X = bm2.prop_up(X)
X_val = bm2.prop_up(X_val)
bm3 = rbm.RBM(hid_layer + 50, hid_layer)
costs = bm3.optimize(X, 600, 0.2, val_set=X_val)
# lets change X
filename = './random_set_cache/data_rbm_run_without_bias.pkl'
first_layer_weights = np.hstack([np.zeros((hid_layer, 1)),
bm3.weights]) # without bias
#first_layer_weights = np.hstack([bm.hidden_bias.reshape(hid_layer, 1), bm.weights]) # with bias
#pickle.dump(first_layer_weights, open(filename, 'w'))
#exit()
#first_layer_weights = pickle.load(open(filename, 'r'))
thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
thetas[0] = first_layer_weights
thetas, costs, val_costs = neur.gradient_decent(X,
y,
learning_rate=0.1,
hidden_layer_sz=hid_layer,
iter=3000,
thetas=thetas,
X_val=X_val,
y_val=y_val,
do_dropout=True,
dropout_percentage=0.7,
do_early_stopping=True)
h_x, a = neur.forward_prop(X_val, thetas)
print "percentage correct predictions: ", ut.percent_equal(
ut.map_to_max_binary_result(h_x), y_val)
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()
def autoencoder_example():
mnist_train = np.fromfile('mnist_training.csv', sep=" ")
mnist_train = np.array(mnist_train.reshape(256, 1000)).transpose()
mnist_targets = np.fromfile('mnist_training_targets.csv', sep=" ")
mnist_targets = np.array(mnist_targets.reshape(10, 1000)).transpose()
X = mnist_train
y = mnist_targets
X, y, X_val, y_val, X_test, y_test = neur.cross_validation_sets(
np.array(X), np.array(y), "digits_rbm_mnist_autoencode")
X_val = np.vstack([X_val, X_test])
y_val = np.vstack([y_val, y_test])
hid_layer = 300
autoenc = ac.Autoencoder(X.shape[1],
hid_layer,
denoise=True,
denoise_percent=0.5)
costs, val_costs = autoenc.optimize(X,
iters=1500,
learning_rate=0.1,
val_set=X_val)
print "::: first encoding done :::"
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()
thetas = neur.create_initial_thetas([64, hid_layer, 10], 0.12)
thetas[0] = autoenc.encode_weights
thetas, costs, val_costs = neur.gradient_decent(X,
y,
learning_rate=0.01,
hidden_layer_sz=hid_layer,
iter=5000,
thetas=thetas,
X_val=X_val,
y_val=y_val,
do_dropout=True,
dropout_percentage=0.9,
do_early_stopping=True)
h_x, a = neur.forward_prop(X_val, thetas)
print "percentage correct predictions: ", ut.percent_equal(
ut.map_to_max_binary_result(h_x), y_val)
print "training error:", costs[-1:][0]
print "validation error:", val_costs[-1:][0]
print "lowest validation error:", min(val_costs)
plt.plot(costs, label='cost')
plt.plot(val_costs, label='val cost')
plt.legend()
plt.ylabel('error rate')
plt.show()