def test_pca_compare_var():
# create some random data
num_samples = 10000
dim = 10
batch_size = 100
num_components = 3
# generate some data
mean = np.random.random(dim)
cov_factor = np.random.random((dim, dim))
cov = np.dot(cov_factor, cov_factor.T)
samples = be.float_tensor(
np.random.multivariate_normal(mean, cov, size=num_samples))
samples_train, samples_validate = batch.split_tensor(samples, 0.9)
data = batch.Batch({
'train':
batch.InMemoryTable(samples_train, batch_size),
'validate':
batch.InMemoryTable(samples_validate, batch_size)
})
# find the principal directions
pca_sgd = factorization.PCA.from_batch(data,
num_components,
epochs=10,
grad_steps_per_minibatch=1,
stepsize=0.01)
pca_svd = factorization.PCA.from_svd(samples_train, num_components)
assert be.norm(pca_sgd.var - pca_svd.var) / be.norm(pca_sgd.var) < 1e-1
def test_gaussian_1D_1mode_train():
# create some example data
num = 10000
mu = 3
sigma = 1
samples = be.randn((num, 1)) * sigma + mu
# set up the reader to get minibatches
batch_size = 100
samples_train, samples_validate = batch.split_tensor(samples, 0.9)
data = batch.Batch({
'train':
batch.InMemoryTable(samples_train, batch_size),
'validate':
batch.InMemoryTable(samples_validate, batch_size)
})
# parameters
learning_rate = schedules.PowerLawDecay(initial=0.1, coefficient=0.1)
mc_steps = 1
num_epochs = 10
num_sample_steps = 100
# set up the model and initialize the parameters
vis_layer = layers.GaussianLayer(1)
hid_layer = layers.OneHotLayer(1)
rbm = BoltzmannMachine([vis_layer, hid_layer])
rbm.initialize(data, method='hinton')
# modify the parameters to shift the initialized model from the data
# this forces it to train
rbm.layers[0].params = layers.ParamsGaussian(
rbm.layers[0].params.loc - 3, rbm.layers[0].params.log_var - 1)
# set up the optimizer and the fit method
opt = optimizers.ADAM(stepsize=learning_rate)
cd = fit.SGD(rbm, data)
# fit the model
print('training with persistent contrastive divergence')
cd.train(opt, num_epochs, method=fit.pcd, mcsteps=mc_steps)
# sample data from the trained model
model_state = \
samplers.SequentialMC.generate_fantasy_state(rbm, num, num_sample_steps)
pts_trained = model_state[0]
percent_error = 10
mu_trained = be.mean(pts_trained)
assert numpy.abs(mu_trained / mu - 1) < (percent_error / 100)
sigma_trained = numpy.sqrt(be.var(pts_trained))
assert numpy.abs(sigma_trained / sigma - 1) < (percent_error / 100)
def test_in_memory_table_batch():
# create data
num_rows = 10000
num_cols = 10
tensor = be.rand((num_rows, num_cols))
# batch it with InMemoryTable
batch_size = 1000
num_train_batches = num_rows // batch_size
data = batch.InMemoryTable(tensor, batch_size)
# loop through, checking the data
i_batch = 0
while True:
# get the data
try:
batch_data = data.get()
except StopIteration:
assert i_batch == num_train_batches
i_batch = 0
break
# check it
assert be.allclose(
batch_data,
tensor[i_batch * batch_size:(i_batch + 1) * batch_size])
i_batch += 1
def test_grbm_reload():
vis_layer = layers.BernoulliLayer(num_vis, center=True)
hid_layer = layers.GaussianLayer(num_hid, center=True)
# create some extrinsics
grbm = BoltzmannMachine([vis_layer, hid_layer])
data = batch.Batch({
'train':
batch.InMemoryTable(be.randn((10 * num_samples, num_vis)), num_samples)
})
grbm.initialize(data)
with tempfile.NamedTemporaryFile() as file:
# save the model
store = pandas.HDFStore(file.name, mode='w')
grbm.save(store)
store.close()
# reload
store = pandas.HDFStore(file.name, mode='r')
grbm_reload = BoltzmannMachine.from_saved(store)
store.close()
# check the two models are consistent
vis_data = vis_layer.random((num_samples, num_vis))
data_state = State.from_visible(vis_data, grbm)
vis_orig = grbm.deterministic_iteration(1, data_state)[0]
vis_reload = grbm_reload.deterministic_iteration(1, data_state)[0]
assert be.allclose(vis_orig, vis_reload)
assert be.allclose(grbm.layers[0].moments.mean,
grbm_reload.layers[0].moments.mean)
assert be.allclose(grbm.layers[0].moments.var,
grbm_reload.layers[0].moments.var)
assert be.allclose(grbm.layers[1].moments.mean,
grbm_reload.layers[1].moments.mean)
assert be.allclose(grbm.layers[1].moments.var,
grbm_reload.layers[1].moments.var)
def test_pca_save_read_num_components():
# create some random data
num_samples = 10000
dim = 10
batch_size = 100
num_components = 3
num_components_save = 2
# generate some data
mean = np.random.random(dim)
cov_factor = np.random.random((dim, dim))
cov = np.dot(cov_factor, cov_factor.T)
samples = be.float_tensor(
np.random.multivariate_normal(mean, cov, size=num_samples))
samples_train, samples_validate = batch.split_tensor(samples, 0.9)
data = batch.Batch({
'train':
batch.InMemoryTable(samples_train, batch_size),
'validate':
batch.InMemoryTable(samples_validate, batch_size)
})
# find the principal directions
pca = factorization.PCA.from_batch(data,
num_components,
epochs=10,
grad_steps_per_minibatch=1,
stepsize=0.01)
# save it
pca_file = tempfile.NamedTemporaryFile()
store = pd.HDFStore(pca_file.name, mode="w")
pca.save(store, num_components_save=num_components_save)
# read it
pca_read = factorization.PCA.from_saved(store)
store.close()
# check it
assert be.allclose(pca.W[:, :num_components_save], pca_read.W)
assert be.allclose(pca.var[:num_components_save], pca_read.var)
assert pca.stepsize == pca_read.stepsize
assert pca_read.num_components == num_components_save
def test_grbm_save():
vis_layer = layers.BernoulliLayer(num_vis, center=True)
hid_layer = layers.GaussianLayer(num_hid, center=True)
grbm = BoltzmannMachine([vis_layer, hid_layer])
data = batch.Batch({
'train':
batch.InMemoryTable(be.randn((10 * num_samples, num_vis)), num_samples)
})
grbm.initialize(data)
with tempfile.NamedTemporaryFile() as file:
store = pandas.HDFStore(file.name, mode='w')
grbm.save(store)
store.close()
def test_in_memory_batch():
# create data
num_rows = 10000
num_cols = 10
tensor = be.rand((num_rows, num_cols))
# read it back with Batch
batch_size = 1000
num_train_batches = num_rows // batch_size
with batch.Batch({
'train': batch.InMemoryTable(tensor, batch_size),
'validate': batch.InMemoryTable(tensor, batch_size)
}) as data:
# loop through thrice, checking the data
i_batch = 0
while True:
# get the data
try:
batch_data_train = data.get("train")
batch_data_validate = data.get("validate")
except StopIteration:
assert i_batch == num_train_batches
i_batch = 0
data.reset_generator("all")
break
# check it
assert be.allclose(
batch_data_train,
tensor[i_batch * batch_size:(i_batch + 1) * batch_size])
assert be.allclose(
batch_data_validate,
tensor[i_batch * batch_size:(i_batch + 1) * batch_size])
i_batch += 1
def test_rbm(paysage_path=None):
num_hidden_units = 50
batch_size = 50
num_epochs = 1
learning_rate = schedules.PowerLawDecay(initial=0.01, coefficient=0.1)
mc_steps = 1
if not paysage_path:
paysage_path = os.path.dirname(
os.path.dirname(os.path.abspath(__file__)))
filepath = os.path.join(paysage_path, 'examples', 'mnist', 'mnist.h5')
if not os.path.exists(filepath):
raise IOError(
"{} does not exist. run mnist/download_mnist.py to fetch from the web"
.format(filepath))
shuffled_filepath = os.path.join(paysage_path, 'examples', 'mnist',
'shuffled_mnist.h5')
# shuffle the data
if not os.path.exists(shuffled_filepath):
shuffler = batch.DataShuffler(filepath, shuffled_filepath, complevel=0)
shuffler.shuffle()
# set a seed for the random number generator
be.set_seed()
import pandas
samples = pre.binarize_color(
be.float_tensor(
pandas.read_hdf(shuffled_filepath,
key='train/images').values[:10000]))
samples_train, samples_validate = batch.split_tensor(samples, 0.95)
data = batch.Batch({
'train':
batch.InMemoryTable(samples_train, batch_size),
'validate':
batch.InMemoryTable(samples_validate, batch_size)
})
# set up the model and initialize the parameters
vis_layer = layers.BernoulliLayer(data.ncols)
hid_layer = layers.BernoulliLayer(num_hidden_units)
rbm = BoltzmannMachine([vis_layer, hid_layer])
rbm.initialize(data)
# obtain initial estimate of the reconstruction error
perf = ProgressMonitor()
untrained_performance = perf.epoch_update(data,
rbm,
store=True,
show=False)
# set up the optimizer and the fit method
opt = optimizers.RMSProp(stepsize=learning_rate)
cd = fit.SGD(rbm, data)
# fit the model
print('training with contrastive divergence')
cd.train(opt, num_epochs, method=fit.pcd, mcsteps=mc_steps)
# obtain an estimate of the reconstruction error after 1 epoch
trained_performance = cd.monitor.memory[-1]
assert (trained_performance['ReconstructionError'] <
untrained_performance['ReconstructionError']), \
"Reconstruction error did not decrease"
# close the HDF5 store
data.close()
def test_tap_machine(paysage_path=None):
num_hidden_units = 10
batch_size = 100
num_epochs = 5
learning_rate = schedules.PowerLawDecay(initial=0.1, coefficient=1.0)
if not paysage_path:
paysage_path = os.path.dirname(
os.path.dirname(os.path.abspath(__file__)))
filepath = os.path.join(paysage_path, 'examples', 'mnist', 'mnist.h5')
if not os.path.exists(filepath):
raise IOError(
"{} does not exist. run mnist/download_mnist.py to fetch from the web"
.format(filepath))
shuffled_filepath = os.path.join(paysage_path, 'examples', 'mnist',
'shuffled_mnist.h5')
# shuffle the data
if not os.path.exists(shuffled_filepath):
shuffler = batch.DataShuffler(filepath, shuffled_filepath, complevel=0)
shuffler.shuffle()
# set a seed for the random number generator
be.set_seed()
# set up the reader to get minibatches
samples = pre.binarize_color(
be.float_tensor(
pandas.read_hdf(shuffled_filepath,
key='train/images').as_matrix()[:10000]))
samples_train, samples_validate = batch.split_tensor(samples, 0.95)
data = batch.Batch({
'train':
batch.InMemoryTable(samples_train, batch_size),
'validate':
batch.InMemoryTable(samples_validate, batch_size)
})
# set up the model and initialize the parameters
vis_layer = layers.BernoulliLayer(data.ncols)
hid_layer = layers.BernoulliLayer(num_hidden_units)
rbm = BoltzmannMachine([vis_layer, hid_layer])
rbm.initialize(data)
# obtain initial estimate of the reconstruction error
perf = ProgressMonitor(generator_metrics = \
[ReconstructionError(), TAPLogLikelihood(10), TAPFreeEnergy(10)])
untrained_performance = perf.epoch_update(data,
rbm,
store=True,
show=False)
# set up the optimizer and the fit method
opt = optimizers.Gradient(stepsize=learning_rate, tolerance=1e-5)
tap = fit.TAP(True, 0.1, 0.01, 25, True, 0.5, 0.001, 0.0)
solver = fit.SGD(rbm, data)
solver.monitor.generator_metrics.append(TAPLogLikelihood(10))
solver.monitor.generator_metrics.append(TAPFreeEnergy(10))
# fit the model
print('training with stochastic gradient ascent')
solver.train(opt, num_epochs, method=tap.tap_update)
# obtain an estimate of the reconstruction error after 1 epoch
trained_performance = solver.monitor.memory[-1]
assert (trained_performance['TAPLogLikelihood'] >
untrained_performance['TAPLogLikelihood']), \
"TAP log-likelihood did not increase"
assert (trained_performance['ReconstructionError'] <
untrained_performance['ReconstructionError']), \
"Reconstruction error did not decrease"
# close the HDF5 store
data.close()
