def main():
data_dir = string.preprocess('${PYLEARN2_DATA_PATH}/stl10')
print('Loading STL10-10 unlabeled and train datasets...')
downsampled_dir = data_dir + '/stl10_32x32'
data = serial.load(downsampled_dir + '/unlabeled.pkl')
supplement = serial.load(downsampled_dir + '/train.pkl')
print('Concatenating datasets...')
data.set_design_matrix(np.concatenate((data.X, supplement.X), axis=0))
del supplement
print("Preparing output directory...")
patch_dir = data_dir + '/stl10_patches_8x8'
serial.mkdir(patch_dir)
README = open(patch_dir + '/README', 'w')
README.write(textwrap.dedent("""
The .pkl files in this directory may be opened in python using
cPickle, pickle, or pylearn2.serial.load.
data.pkl contains a pylearn2 Dataset object defining an unlabeled
dataset of 2 million 6x6 approximately whitened, contrast-normalized
patches drawn uniformly at random from a downsampled (to 32x32)
version of the STL-10 train and unlabeled datasets.
preprocessor.pkl contains a pylearn2 Pipeline object that was used
to extract the patches and approximately whiten / contrast normalize
them. This object is necessary when extracting features for
supervised learning or test set classification, because the
extracted features must be computed using inputs that have been
whitened with the ZCA matrix learned and stored by this Pipeline.
They were created with the pylearn2 script make_stl10_patches.py.
All other files in this directory, including this README, were
created by the same script and are necessary for the other files
to function correctly.
"""))
README.close()
print("Preprocessing the data...")
pipeline = preprocessing.Pipeline()
pipeline.items.append(preprocessing.ExtractPatches(patch_shape=(8, 8),
num_patches=2*1000*1000))
pipeline.items.append(
preprocessing.GlobalContrastNormalization(sqrt_bias=10., use_std=True))
pipeline.items.append(preprocessing.ZCA())
data.apply_preprocessor(preprocessor=pipeline, can_fit=True)
data.use_design_loc(patch_dir + '/data.npy')
serial.save(patch_dir + '/data.pkl', data)
serial.save(patch_dir + '/preprocessor.pkl', pipeline)
def main():
data_dir = string_utils.preprocess('${PYLEARN2_DATA_PATH}')
print('Loading CIFAR-100 train dataset...')
data = CIFAR100(which_set='train')
print("Preparing output directory...")
patch_dir = data_dir + '/cifar100/cifar100_patches'
serial.mkdir(patch_dir)
README = open(patch_dir + '/README', 'w')
README.write(
textwrap.dedent("""
The .pkl files in this directory may be opened in python using
cPickle, pickle, or pylearn2.serial.load.
data.pkl contains a pylearn2 Dataset object defining an unlabeled
dataset of 2 million 6x6 approximately whitened, contrast-normalized
patches drawn uniformly at random from the CIFAR-100 train set.
preprocessor.pkl contains a pylearn2 Pipeline object that was used
to extract the patches and approximately whiten / contrast normalize
them. This object is necessary when extracting features for
supervised learning or test set classification, because the
extracted features must be computed using inputs that have been
whitened with the ZCA matrix learned and stored by this Pipeline.
They were created with the pylearn2 script make_cifar100_patches.py.
All other files in this directory, including this README, were
created by the same script and are necessary for the other files
to function correctly.
"""))
README.close()
print("Preprocessing the data...")
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.ExtractPatches(patch_shape=(6, 6),
num_patches=2 * 1000 * 1000))
pipeline.items.append(
preprocessing.GlobalContrastNormalization(sqrt_bias=10., use_std=True))
pipeline.items.append(preprocessing.ZCA())
data.apply_preprocessor(preprocessor=pipeline, can_fit=True)
data.use_design_loc(patch_dir + '/data.npy')
serial.save(patch_dir + '/data.pkl', data)
serial.save(patch_dir + '/preprocessor.pkl', pipeline)
def get_preprocess_gcn(self, preprocess_id):
row = self.db.executeSQL(
"""
SELECT subtract_mean, std_bias, use_norm
FROM hps3.preprocess_gcn
WHERE preprocess_id = %s
""", (preprocess_id, ), self.db.FETCH_ONE)
if not row or row is None:
raise HPSData("No gcn preprocess for preprocess_id="\
+str(preprocess_id))
(subtract_mean, std_bias, use_norm) = row
return pp.GlobalContrastNormalization(subtract_mean=subtract_mean,
std_bias=std_bias,
use_norm=use_norm)
def get_pipeline(img_shape, patch_size, batch_size):
pipeline = preprocessing.Pipeline()
conf = get_config()
if conf['preprocessing']['remove_mean']:
pipeline.items.append(preprocessing.RemoveMean())
if conf['preprocessing']['gcn']:
pipeline.items.append(
preprocessing.GlobalContrastNormalization(batch_size=batch_size)
)
if conf['preprocessing']['lcn']:
# LCN requires uneven patch size
lcn_patch_size = patch_size + 1 - (patch_size % 2)
pipeline.items.append(
preprocessing.LeCunLCN(
img_shape, kernel_size=lcn_patch_size)
)
return pipeline
def main():
train = cifar10.CIFAR10(which_set="train", center=True)
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.GlobalContrastNormalization(subtract_mean=False,
sqrt_bias=0.0,
use_std=True))
pipeline.items.append(preprocessing.PCA(num_components=512))
test = cifar10.CIFAR10(which_set="test")
train.apply_preprocessor(preprocessor=pipeline, can_fit=True)
test.apply_preprocessor(preprocessor=pipeline, can_fit=False)
serial.save('cifar10_preprocessed_train.pkl', train)
serial.save('cifar10_preprocessed_test.pkl', test)
def get_processed_dataset():
train_path = 'pp_cifar10_train.pkl'
test_path = 'pp_cifar10_test.pkl'
if os.path.exists(train_path) and os.path.exists(
test_path) and not new_params:
print 'loading preprocessed data'
trainset = serial.load(train_path)
testset = serial.load(test_path)
else:
print 'loading raw data...'
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.ExtractPatchesWithPosition(
patch_shape=patch_shape, patches_per_image=patches_per_image))
pipeline.items.append(
preprocessing.GlobalContrastNormalization(sqrt_bias=10.,
use_std=True))
pipeline.items.append(
preprocessing.PCA(num_components=num_components,
keep_var_fraction=keep_var_fraction))
pipeline.items.append(
preprocessing.ExtractPatchPairs(
patches_per_image=patches_per_image,
num_images=train_size,
input_width=input_width))
trainset = cifar10.CIFAR10(which_set="train", start=start, stop=stop)
testset = cifar10.CIFAR10(which_set="test")
trainset.preprocessor = pipeline
trainset.apply_preprocessor(preprocessor=pipeline, can_fit=True)
# the pkl-ing is having issues, the dataset is maybe too big.
serial.save(train_path, trainset)
serial.save(test_path, testset)
# this path will be used for visualizing weights after training is done
trainset.yaml_src = '!pkl: "%s"' % train_path
testset.yaml_src = '!pkl: "%s"' % test_path
return trainset, testset
def get_dataset_cifar10():
"""
The orginal pipeline on cifar10 from pylearn2. Please refer to
pylearn2/scripts/train_example/make_dataset.py for details.
"""
train_path = 'cifar10_preprocessed_train.pkl'
test_path = 'cifar10_preprocessed_test.pkl'
if os.path.exists(train_path) and \
os.path.exists(test_path):
print 'loading preprocessed data'
trainset = serial.load(train_path)
testset = serial.load(test_path)
else:
print 'loading raw data...'
trainset = cifar10.CIFAR10(w5B5B5B5Bhich_set="train")
testset = cifar10.CIFAR10(which_set="test")
print 'preprocessing data...'
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.ExtractPatches(patch_shape=(8, 8), num_patches=150000))
pipeline.items.append(preprocessing.GlobalContrastNormalization())
pipeline.items.append(preprocessing.ZCA())
trainset.apply_preprocessor(preprocessor=pipeline, can_fit=True)
trainset.use_design_loc('train_design.npy')
testset.apply_preprocessor(preprocessor=pipeline, can_fit=True)
testset.use_design_loc('test_design.npy')
print 'saving preprocessed data...'
serial.save('cifar10_preprocessed_train.pkl', trainset)
serial.save('cifar10_preprocessed_test.pkl', testset)
trainset.yaml_src = '!pkl: "%s"' % train_path
testset.yaml_src = '!pkl: "%s"' % test_path
# this path will be used for visualizing weights after training is done
#global YAML
return trainset, testset
def generate_patches():
datasets = OrderedDict()
datasets['train'] = GenderWrite.gwdata.GWData(which_set='train',
start=1,
stop=201)
datasets['valid'] = GenderWrite.gwdata.GWData(which_set='train',
start=201,
stop=283)
datasets['test'] = GenderWrite.gwdata.GWData(which_set='test')
datasets['tottrain'] = GenderWrite.gwdata.GWData(which_set='train')
# preprocess patches
pipeline = preprocessing.Pipeline()
pipeline.items.append(preprocessing.GlobalContrastNormalization())
pipeline.items.append(preprocessing.ZCA())
for dstr, dset in datasets.iteritems():
print dstr
# only fit on train data
trainbool = dstr == 'train' or dstr == 'tottrain'
dset.apply_preprocessor(preprocessor=pipeline, can_fit=trainbool)
# save
dset.use_design_loc(DATA_DIR + dstr + '_design.npy')
serial.save(DATA_DIR + 'gw_preprocessed_' + dstr + '.pkl', dset)
from pylearn2.utils import serial
from pylearn2.datasets import cifar10
from pylearn2.datasets import preprocessing
train = cifar10.CIFAR10(which_set="train")
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.ExtractPatches(patch_shape=(8, 8), num_patches=2000000))
pipeline.items.append(preprocessing.GlobalContrastNormalization())
pipeline.items.append(preprocessing.ZCA())
test = cifar10.CIFAR10(which_set="test")
train.apply_preprocessor(preprocessor=pipeline, can_fit=True)
test.apply_preprocessor(preprocessor=pipeline, can_fit=False)
train.use_design_loc(
'/data/lisatmp/goodfeli/cifar10_preprocessed_train_2M_design.npy')
test.use_design_loc(
'/data/lisatmp/goodfeli/cifar10_preprocessed_test_2M_design.npy')
serial.save('/data/lisatmp/goodfeli/cifar10_preprocessed_train_2M.pkl', train)
serial.save('/data/lisatmp/goodfeli/cifar10_preprocessed_test_2M.pkl', test)
#replicate the preprocessing described in Kai Yu's paper Improving LCC with Local Tangents
from pylearn2.utils import serial
from pylearn2.datasets import cifar10
from pylearn2.datasets import preprocessing
train = cifar10.CIFAR10(which_set="train", center=True)
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.GlobalContrastNormalization(subtract_mean=False,
std_bias=0.0))
pipeline.items.append(preprocessing.PCA(num_components=512))
test = cifar10.CIFAR10(which_set="test")
train.apply_preprocessor(preprocessor=pipeline, can_fit=True)
test.apply_preprocessor(preprocessor=pipeline, can_fit=False)
serial.save('cifar10_preprocessed_train.pkl', train)
serial.save('cifar10_preprocessed_test.pkl', test)
def generate(opc):
"""
Summary (Generates a dataset with the chosen transformation).
Parameters
----------
opc: string
Only two options, shifts or rotations.
"""
dim = 19 # outer square
# A bigger image is used to avoid empty pixels in the
# borders.
reg = 13 # inner square
total = 20000 # Number of training examples
im1 = numpy.zeros((total, reg, reg, 1), dtype='float32')
im2 = numpy.zeros((total, reg, reg, 1), dtype='float32')
Y = numpy.zeros((total, 1), dtype='uint8')
rng = make_np_rng(9001, [1, 2, 3], which_method="uniform")
transformation = opc
if transformation == 'shifts':
# Shifts
# only shifts between [-3, +3] pixels
shifts = list(itertools.product(range(-3, 4), range(-3, 4)))
t = 0
while t < total:
x = rng.uniform(0, 1, (dim, dim))
x = numpy.ceil(x * 255)
im_x = x[3:16, 3:16][:, :, None]
ind = rng.randint(0, len(shifts))
Y[t] = ind
txy = shifts[ind]
tx, ty = txy
im_y = x[(3 + tx):(16 + tx), (3 + ty):(16 + ty)][:, :, None]
im1[t, :] = im_x
im2[t, :] = im_y
t += 1
else:
assert transformation == 'rotations'
# Rotations
import Image
# import cv2
angs = numpy.linspace(0, 359, 90)
t = 0
while t < total:
x = rng.uniform(0, 1, (dim, dim))
x = numpy.ceil(x * 255)
im_x = x[3:16, 3:16][:, :, None]
ind = rng.randint(0, len(angs))
Y[t] = ind
ang = angs[ind]
y = numpy.asarray(Image.fromarray(x).rotate(ang))
# scale = 1
# M1 = cv2.getRotationMatrix2D((dim/2, dim/2), ang, scale)
# y = cv2.warpAffine(x, M1, (dim, dim))
im_y = y[3:16, 3:16][:, :, None]
im1[t, :] = im_x
im2[t, :] = im_y
t += 1
view_converter = dense_design_matrix.DefaultViewConverter((reg, reg, 1))
design_X = view_converter.topo_view_to_design_mat(im1)
design_Y = view_converter.topo_view_to_design_mat(im2)
# Normalize data:
pipeline = preprocessing.Pipeline()
gcn = preprocessing.GlobalContrastNormalization(sqrt_bias=10.,
use_std=True)
pipeline.items.append(gcn)
XY = numpy.concatenate((design_X, design_Y), 0)
XY_ImP = dense_design_matrix.DenseDesignMatrix(X=XY)
XY_ImP.apply_preprocessor(preprocessor=pipeline, can_fit=True)
X1 = XY_ImP.X[0:design_X.shape[0], :]
X2 = XY_ImP.X[design_X.shape[0]:, :]
# As a Conv2DSpace
topo_X1 = view_converter.design_mat_to_topo_view(X1)
topo_X2 = view_converter.design_mat_to_topo_view(X2)
axes = ('b', 0, 1, 'c')
data_specs = (CompositeSpace([
Conv2DSpace((reg, reg), num_channels=1, axes=axes),
Conv2DSpace((reg, reg), num_channels=1, axes=axes),
VectorSpace(1)
]), ('featuresX', 'featuresY', 'targets'))
train = VectorSpacesDataset((topo_X1, topo_X2, Y), data_specs=data_specs)
# As a VectorSpace
# data_specs = (CompositeSpace(
# [VectorSpace(reg * reg),
# VectorSpace(reg * reg),
# VectorSpace(1)]),
# ('featuresX', 'featuresY', 'targets'))
# train = VectorSpacesDataset(data=(X1, X2, Y), data_specs=data_specs)
import os
save_path = os.path.dirname(os.path.realpath(__file__))
serial.save(os.path.join(save_path, 'train_preprocessed.pkl'), train)
if str(data.X.dtype) != config.floatX:
logging.warning("The dataset is saved as {}, changing theano's floatX " \
"to the same dtype".format(data.X.dtype))
config.floatX = str(data.X.dtype)
# Load train data
train = SVHN('splitted_train', path=local_path)
check_dtype(train)
# prepare preprocessing
pipeline = preprocessing.Pipeline()
# without batch_size there is a high chance that you might encounter memory error
# or pytables crashes
pipeline.items.append(
preprocessing.GlobalContrastNormalization(batch_size=5000))
pipeline.items.append(preprocessing.LeCunLCN((32, 32)))
# apply the preprocessings to train
train.apply_preprocessor(pipeline, can_fit=True)
del train
# load and preprocess valid
valid = SVHN('valid', path=local_path)
check_dtype(valid)
valid.apply_preprocessor(pipeline, can_fit=False)
# load and preprocess test
test = SVHN('test', path=local_path)
check_dtype(test)
test.apply_preprocessor(pipeline, can_fit=False)
def get_dataset(tot=False, preprocessor='normal'):
if not os.path.exists(DATA_DIR+'train.npy') or \
not os.path.exists(DATA_DIR+'test.npy') or \
not os.path.exists(DATA_DIR+'targets.npy'):
initial_read()
train_path = DATA_DIR+'train_'+preprocessor+'_preprocessed.pkl'
valid_path = DATA_DIR+'valid_'+preprocessor+'_preprocessed.pkl'
tottrain_path = DATA_DIR+'tottrain_'+preprocessor+'_preprocessed.pkl'
test_path = DATA_DIR+'test_'+preprocessor+'_preprocessed.pkl'
if os.path.exists(train_path) and os.path.exists(valid_path) and os.path.exists(test_path):
print 'loading preprocessed data'
trainset = serial.load(train_path)
validset = serial.load(valid_path)
if tot:
tottrainset = serial.load(tottrain_path)
testset = serial.load(test_path)
else:
print 'loading raw data...'
trainset = Digits(which_set='train', start=0, stop=34000)
validset = Digits(which_set='train', start=34000, stop=42000)
tottrainset = Digits(which_set='train')
testset = Digits(which_set='test')
print 'preprocessing data...'
pipeline = preprocessing.Pipeline()
pipeline.items.append(preprocessing.GlobalContrastNormalization(sqrt_bias=10., use_std=True))
if preprocessor != 'nozca':
# ZCA = zero-phase component analysis
# very similar to PCA, but preserves the look of the original image better
pipeline.items.append(preprocessing.ZCA())
# note the can_fit=False's: no sharing between train and valid data
trainset.apply_preprocessor(preprocessor=pipeline, can_fit=True)
validset.apply_preprocessor(preprocessor=pipeline, can_fit=False)
tottrainset.apply_preprocessor(preprocessor=pipeline, can_fit=True)
testset.apply_preprocessor(preprocessor=pipeline, can_fit=False)
if preprocessor not in ('normal','nozca'):
for data in (trainset, validset, tottrainset, testset):
for ii in range(data.X.shape[0]):
# normalize to [0,1]
dmax = np.max(data.X[ii,:])
dmin = np.min(data.X[ii,:])
dnorm = (data.X[ii,:] - dmin) / (dmax - dmin)
# and convert to PIL image
img = Image.fromarray(dnorm.reshape(28, 28) * 255.).convert('L')
# apply preprocessor
if preprocessor == 'rotate':
rot = rng.randint(-40, 41)
img = img.rotate(rot, Image.BILINEAR)
elif preprocessor == 'emboss':
img = emboss(img)
elif preprocessor == 'hshear':
# coef = 0 means unsheared
coef = -1 + np.random.rand()*2
# note: image is moved with (coef/2)*28 to center it after shearing
img = img.transform((28,28), Image.AFFINE, (1,coef,-(coef/2)*28,0,1,0), Image.BILINEAR)
elif preprocessor == 'vshear':
coef = -1 + np.random.rand()*2
img = img.transform((28,28), Image.AFFINE, (1,0,0,coef,1,-(coef/2)*28), Image.BILINEAR)
elif preprocessor == 'patch':
# negative values are not possible in PIL, so do a zoom only transform then
x1 = np.random.randint(0, 5)
y1 = np.random.randint(0, 5)
x2 = np.random.randint(0, 5)
y2 = np.random.randint(0, 5)
img = img.transform((28,28), Image.EXTENT, (x1, y1, 28-x2, 28-y2), Image.BILINEAR)
# convert back to numpy array
data.X[ii,:] = np.array(img.getdata()) / 255.
if preprocessor == 'noisy':
# add noise
data.X[ii,:] += np.random.randn(28*28) * 0.1
# bound between [0,1]
data.X[ii,:] = np.minimum(np.ones(28*28), np.maximum(np.zeros(28*28), data.X[ii,:]))
# this uses numpy format for storage instead of pickle, for memory reasons
trainset.use_design_loc(DATA_DIR+'train_'+preprocessor+'_design.npy')
validset.use_design_loc(DATA_DIR+'valid_'+preprocessor+'_design.npy')
tottrainset.use_design_loc(DATA_DIR+'tottrain_'+preprocessor+'_design.npy')
testset.use_design_loc(DATA_DIR+'test_'+preprocessor+'_design.npy')
# this path can be used for visualizing weights after training is done
trainset.yaml_src = '!pkl: "%s"' % train_path
validset.yaml_src = '!pkl: "%s"' % valid_path
tottrainset.yaml_src = '!pkl: "%s"' % tottrain_path
testset.yaml_src = '!pkl: "%s"' % test_path
print 'saving preprocessed data...'
serial.save(train_path, trainset)
serial.save(valid_path, validset)
serial.save(tottrain_path, tottrainset)
serial.save(test_path, testset)
if tot:
return tottrainset, validset, testset
else:
return trainset, validset, testset
def test_works():
load = True
if load == False:
ddmTrain = FacialKeypoint(which_set='train', start=0, stop=6000)
ddmValid = FacialKeypoint(which_set='train', start=6000, stop=7049)
# valid can_fit = false
pipeline = preprocessing.Pipeline()
stndrdz = preprocessing.Standardize()
stndrdz.apply(ddmTrain, can_fit=True)
#doubt, how about can_fit = False?
stndrdz.apply(ddmValid, can_fit=False)
GCN = preprocessing.GlobalContrastNormalization()
GCN.apply(ddmTrain, can_fit=True)
GCN.apply(ddmValid, can_fit=False)
pcklFile = open('kpd.pkl', 'wb')
obj = (ddmTrain, ddmValid)
pickle.dump(obj, pcklFile)
pcklFile.close()
return
else:
pcklFile = open('kpd.pkl', 'rb')
(ddmTrain, ddmValid) = pickle.load(pcklFile)
pcklFile.close()
#creating layers
#2 convolutional rectified layers, border mode valid
layer1 = ConvRectifiedLinear(layer_name='convRect1',
output_channels=64,
irange=.05,
kernel_shape=[5, 5],
pool_shape=[3, 3],
pool_stride=[2, 2],
max_kernel_norm=1.9365)
layer2 = ConvRectifiedLinear(layer_name='convRect2',
output_channels=64,
irange=.05,
kernel_shape=[5, 5],
pool_shape=[3, 3],
pool_stride=[2, 2],
max_kernel_norm=1.9365)
# Rectified linear units
layer3 = RectifiedLinear(dim=3000, sparse_init=15, layer_name='RectLin3')
#multisoftmax
n_groups = 30
n_classes = 98
irange = 0
layer_name = 'multisoftmax'
layerMS = MultiSoftmax(n_groups=n_groups,
irange=0.05,
n_classes=n_classes,
layer_name=layer_name)
#setting up MLP
MLPerc = MLP(batch_size=8,
input_space=Conv2DSpace(shape=[96, 96], num_channels=1),
layers=[layer1, layer2, layer3, layerMS])
#mlp_cost
missing_target_value = -1
mlp_cost = MLPCost(cost_type='default',
missing_target_value=missing_target_value)
#algorithm
# learning rate, momentum, batch size, monitoring dataset, cost, termination criteria
term_crit = MonitorBased(prop_decrease=0.00001,
N=30,
channel_name='validation_objective')
kpSGD = KeypointSGD(learning_rate=0.001,
init_momentum=0.5,
monitoring_dataset={
'validation': ddmValid,
'training': ddmTrain
},
batch_size=8,
batches_per_iter=750,
termination_criterion=term_crit,
train_iteration_mode='random_uniform',
cost=mlp_cost)
#train extension
train_ext = ExponentialDecayOverEpoch(decay_factor=0.998,
min_lr_scale=0.01)
#train object
train = Train(dataset=ddmTrain,
save_path='kpd_model2.pkl',
save_freq=1,
model=MLPerc,
algorithm=kpSGD,
extensions=[
train_ext,
MonitorBasedSaveBest(channel_name='validation_objective',
save_path='kpd_best.pkl'),
MomentumAdjustor(start=1, saturate=20, final_momentum=.9)
])
train.main_loop()
train.save()
# We'd like to do several operations on them, so we'll set up a pipeline to
# do so.
pipeline = preprocessing.Pipeline()
# First we want to pull out small patches of the images, since it's easier
# to train an RBM on these
pipeline.items.append(
preprocessing.ExtractPatches(patch_shape=(8, 8), num_patches=150000)
)
# Next we contrast normalize the patches. The default arguments use the
# same "regularization" parameters as those used in Adam Coates, Honglak
# Lee, and Andrew Ng's paper "An Analysis of Single-Layer Networks in
# Unsupervised Feature Learning"
pipeline.items.append(preprocessing.GlobalContrastNormalization(sqrt_bias=10., use_std=True))
# Finally we whiten the data using ZCA. Again, the default parameters to
# ZCA are set to the same values as those used in the previously mentioned
# paper.
pipeline.items.append(preprocessing.ZCA())
# Here we apply the preprocessing pipeline to the dataset. The can_fit
# argument indicates that data-driven preprocessing steps (such as the ZCA
# step in this example) are allowed to fit themselves to this dataset.
# Later we might want to run the same pipeline on the test set with the
# can_fit flag set to False, in order to make sure that the same whitening
# matrix was used on both datasets.
train.apply_preprocessor(preprocessor=pipeline, can_fit=True)
# Finally we save the dataset to the filesystem. We instruct the dataset to
#replicate the preprocessing described in Kai Yu's paper Improving LCC with Local Tangents
from pylearn2.utils import serial
from pylearn2.datasets import cifar10
from pylearn2.datasets import preprocessing
train = cifar10.CIFAR10(which_set="train", center=True)
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.GlobalContrastNormalization(subtract_mean=False,
sqrt_bias=0.0,
use_std=True))
pipeline.items.append(preprocessing.PCA(num_components=512))
test = cifar10.CIFAR10(which_set="test")
train.apply_preprocessor(preprocessor=pipeline, can_fit=True)
test.apply_preprocessor(preprocessor=pipeline, can_fit=False)
serial.save('cifar10_preprocessed_train.pkl', train)
serial.save('cifar10_preprocessed_test.pkl', test)
from pylearn2.utils import serial
from pylearn2.datasets import cifar10
from pylearn2.datasets import preprocessing
train = cifar10.CIFAR10(which_set="train")
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.ExtractPatches(patch_shape=(8, 8), num_patches=2000000))
pipeline.items.append(
preprocessing.GlobalContrastNormalization(std_bias=0.0, use_norm=1.))
test = cifar10.CIFAR10(which_set="test")
train.apply_preprocessor(preprocessor=pipeline, can_fit=True)
test.apply_preprocessor(preprocessor=pipeline, can_fit=False)
train.use_design_loc(
'/data/lisatmp/goodfeli/cifar10_sphere_train_2M_design.npy')
test.use_design_loc('/data/lisatmp/goodfeli/cifar10_sphere_test_2M_design.npy')
serial.save('/data/lisatmp/goodfeli/cifar10_sphere_train_2M.pkl', train)
serial.save('/data/lisatmp/goodfeli/cifar10_sphere_test_2M.pkl', test)
train = serial.load('/data/lisatmp/goodfeli/cifar10_sphere_train_2M.pkl')
to extract the patches and approximately whiten / contrast normalize
them. This object is necessary when extracting features for
supervised learning or test set classification, because the
extracted features must be computed using inputs that have been
whitened with the ZCA matrix learned and stored by this Pipeline.
They were created with the pylearn2 script make_cifar100_patches.py.
All other files in this directory, including this README, were
created by the same script and are necessary for the other files
to function correctly.
""")
README.close()
print("Preprocessing the data...")
pipeline = preprocessing.Pipeline()
pipeline.items.append(
preprocessing.ExtractPatches(patch_shape=(8, 8),
num_patches=2 * 1000 * 1000))
pipeline.items.append(
preprocessing.GlobalContrastNormalization(sqrt_bias=10., use_std=True))
pipeline.items.append(preprocessing.ZCA())
data.apply_preprocessor(preprocessor=pipeline, can_fit=True)
data.use_design_loc(patch_dir + '/data.npy')
serial.save(patch_dir + '/data.pkl', data)
serial.save(patch_dir + '/preprocessor.pkl', pipeline)
def get_data(tot=True, flatgrey=False):
tottrain_path = DATA_DIR+'gz_preprocessed_tottrain' + str(SUBMODEL) + '_64x.pkl'
test_path = DATA_DIR+'gz_preprocessed_test' + str(SUBMODEL) + '_64x.pkl'
if os.path.exists(test_path):
print 'loading preprocessed data'
datasets = OrderedDict()
# datasets['train'] = serial.load(train_path)
# datasets['valid'] = serial.load(valid_path)
if tot:
datasets['tottrain'] = serial.load(tottrain_path)
datasets['test'] = serial.load(test_path)
if tot:
return datasets['tottrain'], datasets['test']
else:
return datasets['train'], datasets['test']
else:
print 'preprocessing data...'
pipeline = preprocessing.Pipeline()
pipeline.items.append(preprocessing.GlobalContrastNormalization(use_std=True))
pipeline.items.append(preprocessing.ZCA())
# print 'traindata'
# data = GalaxyZoo.gzdeepdata.GZData(which_set='training', start=0, stop=39999)
# data.apply_preprocessor(preprocessor=pipeline, can_fit=True)
# # this path can be used for visualizing weights after training is done
# data.yaml_src = '!pkl: "%s"' % data
# # save
# data.use_design_loc(DATA_DIR+'train_design' + str(SUBMODEL) + '.npy')
# serial.save(DATA_DIR+'gz_preprocessed_train'+str(SUBMODEL) + '.pkl', data)
# print 'validdata'
# data = GalaxyZoo.gzdeepdata.GZData(which_set='training', start=40000, stop=61577)
# data.apply_preprocessor(preprocessor=pipeline, can_fit=False)
# # this path can be used for visualizing weights after training is done
# data.yaml_src = '!pkl: "%s"' % data
# # save
# data.use_design_loc(DATA_DIR+'valid_design' + str(SUBMODEL) + '.npy')
# serial.save(DATA_DIR+'gz_preprocessed_valid'+str(SUBMODEL) + '.pkl', data)
print 'tottraindata'
data = GalaxyZoo.gzdeepdata.GZData(which_set='training', flatgrey=flatgrey)
data.apply_preprocessor(preprocessor=pipeline, can_fit=True)
# this path can be used for visualizing weights after training is done
data.yaml_src = '!pkl: "%s"' % data
# save
data.use_design_loc(DATA_DIR + 'tottrain_design' + str(SUBMODEL) + '_64x.npy')
serial.save(DATA_DIR + 'gz_preprocessed_tottrain' + str(SUBMODEL) + '_64x.pkl', data)
print 'testdata'
data = GalaxyZoo.gzdeepdata.GZData(which_set='test', flatgrey=flatgrey)
data.apply_preprocessor(preprocessor=pipeline, can_fit=False)
# this path can be used for visualizing weights after training is done
data.yaml_src = '!pkl: "%s"' % data
# save
data.use_design_loc(DATA_DIR + 'test_design' + str(SUBMODEL) + '_64x.npy')
serial.save(DATA_DIR + 'gz_preprocessed_test' + str(SUBMODEL) + '_64x.pkl', data)
print 'Finished, now re-run for running model on GPU'
return None, None