def __init__(self, train_dir: str, dataset: data.DataSets, **kwargs):
self.train_dir = os.path.join(train_dir, FLAGS.rerun,
self.experiment_name(**kwargs))
self.params = EasyDict(kwargs)
self.dataset = dataset
self.session = None
self.tmp = EasyDict(print_queue=[], cache=EasyDict())
self.step = tf.train.get_or_create_global_step()
self.ops = self.model(**kwargs)
self.ops.update_step = tf.assign_add(self.step, FLAGS.batch)
self.add_summaries(**kwargs)
print(' Config '.center(80, '-'))
print('train_dir', self.train_dir)
print('%-32s %s' % ('Model', self.__class__.__name__))
print('%-32s %s' % ('Dataset', dataset.name))
for k, v in sorted(kwargs.items()):
print('%-32s %s' % (k, v))
print(' Model '.center(80, '-'))
to_print = [
tuple(['%s' % x for x in (v.name, np.prod(v.shape), v.shape)])
for v in utils.model_vars(None)
]
to_print.append(('Total', str(sum(int(x[1]) for x in to_print)), ''))
sizes = [max([len(x[i]) for x in to_print]) for i in range(3)]
fmt = '%%-%ds %%%ds %%%ds' % tuple(sizes)
for x in to_print[:-1]:
print(fmt % x)
print()
print(fmt % to_print[-1])
print('-' * 80)
self._create_initial_files()
def guess_label(self, logits_y, p_data, p_model, T, use_dm, redux,
**kwargs):
del kwargs
if redux == 'swap':
p_model_y = tf.concat(
[tf.nn.softmax(x) for x in logits_y[1:] + logits_y[:1]],
axis=0)
elif redux == 'mean':
p_model_y = sum(tf.nn.softmax(x) for x in logits_y) / len(logits_y)
p_model_y = tf.tile(p_model_y, [len(logits_y), 1])
elif redux == '1st':
p_model_y = tf.nn.softmax(logits_y[0])
p_model_y = tf.tile(p_model_y, [len(logits_y), 1])
else:
raise NotImplementedError()
# Compute the target distribution.
# 1. Rectify the distribution or not.
if use_dm:
p_ratio = (1e-6 + p_data) / (1e-6 + p_model)
p_weighted = p_model_y * p_ratio
p_weighted /= tf.reduce_sum(p_weighted, axis=1, keep_dims=True)
else:
p_weighted = p_model_y
# 2. Apply sharpening.
p_target = tf.pow(p_weighted, 1. / T)
p_target /= tf.reduce_sum(p_target, axis=1, keep_dims=True)
return EasyDict(p_target=p_target, p_model=p_model_y)
def model(self, batch, lr, wd, ema, warmup_pos, consistency_weight,
**kwargs):
hwc = [self.dataset.height, self.dataset.width, self.dataset.colors]
xt_in = tf.placeholder(tf.float32, [batch] + hwc, 'xt') # For training
x_in = tf.placeholder(tf.float32, [None] + hwc, 'x')
y_in = tf.placeholder(tf.float32, [batch, 2] + hwc, 'y')
l_in = tf.placeholder(tf.int32, [batch], 'labels')
l = tf.one_hot(l_in, self.nclass)
wd *= lr
warmup = tf.clip_by_value(
tf.to_float(self.step) / (warmup_pos * (FLAGS.train_kimg << 10)),
0, 1)
classifier = lambda x, **kw: self.classifier(x, **kw, **kwargs).logits
logits_x = classifier(xt_in, training=True)
post_ops = tf.get_collection(
tf.GraphKeys.UPDATE_OPS
) # Take only first call to update batch norm.
y = tf.reshape(tf.transpose(y_in, [1, 0, 2, 3, 4]), [-1] + hwc)
y_1, y_2 = tf.split(y, 2)
ema = tf.train.ExponentialMovingAverage(decay=ema)
ema_op = ema.apply(utils.model_vars())
ema_getter = functools.partial(utils.getter_ema, ema)
logits_y = classifier(y_1, training=True, getter=ema_getter)
logits_teacher = tf.stop_gradient(logits_y)
logits_student = classifier(y_2, training=True)
loss_mt = tf.reduce_mean(
(tf.nn.softmax(logits_teacher) - tf.nn.softmax(logits_student))**2,
-1)
loss_mt = tf.reduce_mean(loss_mt)
loss = tf.nn.softmax_cross_entropy_with_logits_v2(labels=l,
logits=logits_x)
loss = tf.reduce_mean(loss)
tf.summary.scalar('losses/xe', loss)
tf.summary.scalar('losses/mt', loss_mt)
post_ops.append(ema_op)
post_ops.extend([
tf.assign(v, v * (1 - wd)) for v in utils.model_vars('classify')
if 'kernel' in v.name
])
train_op = tf.train.AdamOptimizer(lr).minimize(
loss + loss_mt * warmup * consistency_weight,
colocate_gradients_with_ops=True)
with tf.control_dependencies([train_op]):
train_op = tf.group(*post_ops)
return EasyDict(
xt=xt_in,
x=x_in,
y=y_in,
label=l_in,
train_op=train_op,
classify_raw=tf.nn.softmax(classifier(
x_in, training=False)), # No EMA, for debugging.
classify_op=tf.nn.softmax(
classifier(x_in, getter=ema_getter, training=False)))
def model(self, batch, lr, wd, ema, warmup_pos, consistency_weight, tcr_augment, **kwargs):
hwc = [self.dataset.height, self.dataset.width, self.dataset.colors]
xt_in = tf.placeholder(tf.float32, [batch] + hwc, 'xt') # For training
x_in = tf.placeholder(tf.float32, [None] + hwc, 'x')
y_in = tf.placeholder(tf.float32, [batch, 2] + hwc, 'y') # The unlabeled data
l_in = tf.placeholder(tf.int32, [batch], 'labels')
l = tf.one_hot(l_in, self.nclass)
warmup = tf.clip_by_value(tf.to_float(self.step) / (warmup_pos * (FLAGS.train_kimg << 10)), 0, 1)
lrate = tf.clip_by_value(tf.to_float(self.step) / (FLAGS.train_kimg << 10), 0, 1)
lr *= tf.cos(lrate * (7 * np.pi) / (2 * 8))
tf.summary.scalar('monitors/lr', lr)
# Labeled data.
classifier = lambda x, **kw: self.classifier(x, **kw, **kwargs).logits
logits_x = classifier(xt_in, training=True)
post_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS) # Take only first call to update batch norm.
# Unlabeled data.
classifier_embedding = lambda x, **kw: self.classifier(x, **kw, **kwargs).embeds
y = tf.reshape(tf.transpose(y_in, [1, 0, 2, 3, 4]), [-1] + hwc)
y_delta = self.augment(y, tcr_augment=tcr_augment) # Apply tcr_augment
y_1, y_2 = tf.split(y, 2)
y_1_delta, y_2_delta = tf.split(y_delta, 2)
embeds_y_1 = classifier_embedding(y_1, training=True)
embeds_y_1_delta = classifier_embedding(y_1_delta, training=True)
embeds_y_2 = classifier_embedding(y_2, training=True)
embeds_y_2_delta = classifier_embedding(y_2_delta, training=True)
loss_tcr = tf.losses.mean_squared_error((y_1_delta - y_1), (y_2_delta - y_2))
loss_tcr = tf.reduce_mean(loss_tcr)
tf.summary.scalar('losses/xeu', loss_tcr)
loss = tf.nn.softmax_cross_entropy_with_logits_v2(labels=l, logits=logits_x)
loss = tf.reduce_mean(loss)
tf.summary.scalar('losses/xe', loss)
# L2 regularization
loss_wd = sum(tf.nn.l2_loss(v) for v in utils.model_vars('classify') if 'kernel' in v.name)
tf.summary.scalar('losses/wd', loss_wd)
ema = tf.train.ExponentialMovingAverage(decay=ema)
ema_op = ema.apply(utils.model_vars())
ema_getter = functools.partial(utils.getter_ema, ema)
post_ops.append(ema_op)
train_op = tf.train.MomentumOptimizer(lr, 0.9, use_nesterov=True).minimize(
loss + loss_tcr * warmup * consistency_weight + wd * loss_wd, colocate_gradients_with_ops=True)
with tf.control_dependencies([train_op]):
train_op = tf.group(*post_ops)
return EasyDict(
xt=xt_in, x=x_in, y=y_in, label=l_in, train_op=train_op,
classify_raw=tf.nn.softmax(classifier(x_in, training=False)), # No EMA, for debugging.
classify_op=tf.nn.softmax(classifier(x_in, getter=ema_getter, training=False)))
def model(self, batch, lr, wd, ema, **kwargs):
hwc = [self.dataset.height, self.dataset.width, self.dataset.colors]
xt_in = tf.placeholder(tf.float32, [batch] + hwc, 'xt') # For training
x_in = tf.placeholder(tf.float32, [None] + hwc, 'x')
y_in = tf.placeholder(tf.float32, [batch] + hwc, 'y')
l_in = tf.placeholder(tf.int32, [batch], 'labels')
wd *= lr
classifier = lambda x, **kw: self.classifier(x, **kw, **kwargs).logits
def get_logits(x):
logits = classifier(x, training=True)
return logits
x, labels_x = self.augment(xt_in, tf.one_hot(l_in, self.nclass),
**kwargs)
logits_x = get_logits(x)
post_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
y, labels_y = self.augment(y_in, tf.nn.softmax(get_logits(y_in)),
**kwargs)
labels_y = tf.stop_gradient(labels_y)
logits_y = get_logits(y)
loss_xe = tf.nn.softmax_cross_entropy_with_logits_v2(labels=labels_x,
logits=logits_x)
loss_xe = tf.reduce_mean(loss_xe)
loss_xeu = tf.nn.softmax_cross_entropy_with_logits_v2(labels=labels_y,
logits=logits_y)
loss_xeu = tf.reduce_mean(loss_xeu)
tf.summary.scalar('losses/xe', loss_xe)
tf.summary.scalar('losses/xeu', loss_xeu)
ema = tf.train.ExponentialMovingAverage(decay=ema)
ema_op = ema.apply(utils.model_vars())
ema_getter = functools.partial(utils.getter_ema, ema)
post_ops.append(ema_op)
post_ops.extend([
tf.assign(v, v * (1 - wd)) for v in utils.model_vars('classify')
if 'kernel' in v.name
])
train_op = tf.train.AdamOptimizer(lr).minimize(
loss_xe + loss_xeu, colocate_gradients_with_ops=True)
with tf.control_dependencies([train_op]):
train_op = tf.group(*post_ops)
return EasyDict(
xt=xt_in,
x=x_in,
y=y_in,
label=l_in,
train_op=train_op,
classify_raw=tf.nn.softmax(classifier(
x_in, training=False)), # No EMA, for debugging.
classify_op=tf.nn.softmax(
classifier(x_in, getter=ema_getter, training=False)))
def guess_label(self, y, classifier, T, **kwargs):
del kwargs
logits_y = [classifier(yi, training=True) for yi in y]
logits_y = tf.concat(logits_y, 0)
# Compute predicted probability distribution py.
p_model_y = tf.reshape(tf.nn.softmax(logits_y), [len(y), -1, self.nclass])
p_model_y = tf.reduce_mean(p_model_y, axis=0)
# Compute the target distribution.
p_target = tf.pow(p_model_y, 1. / T)
p_target /= tf.reduce_sum(p_target, axis=1, keep_dims=True)
return EasyDict(p_target=p_target, p_model=p_model_y)
def classifier(self, x, scales, filters, training, getter=None, **kwargs):
del kwargs
assert scales == 3 # Only specified for 32x32 inputs.
conv_args = dict(kernel_size=3,
activation=tf.nn.leaky_relu,
padding='same')
bn_args = dict(training=training, momentum=0.999)
with tf.variable_scope('classify',
reuse=tf.AUTO_REUSE,
custom_getter=getter):
y = tf.layers.conv2d((x - self.dataset.mean) / self.dataset.std,
filters, **conv_args)
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.conv2d(y, filters, **conv_args)
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.conv2d(y, filters, **conv_args)
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.max_pooling2d(y, 2, 2)
y = tf.layers.conv2d(y, 2 * filters, **conv_args)
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.conv2d(y, 2 * filters, **conv_args)
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.conv2d(y, 2 * filters, **conv_args)
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.max_pooling2d(y, 2, 2)
y = tf.layers.conv2d(y,
4 * filters,
kernel_size=3,
activation=tf.nn.leaky_relu,
padding='valid')
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.conv2d(y,
2 * filters,
kernel_size=1,
activation=tf.nn.leaky_relu,
padding='same')
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.layers.conv2d(y,
1 * filters,
kernel_size=1,
activation=tf.nn.leaky_relu,
padding='same')
y = tf.layers.batch_normalization(y, **bn_args)
y = tf.reduce_mean(y, [1, 2]) # (b, 6, 6, 128) -> (b, 128)
logits = tf.layers.dense(y, self.nclass)
return EasyDict(logits=logits, embeds=y)
def _load_stl10():
def unflatten(images):
return np.transpose(images.reshape((-1, 3, 96, 96)), [0, 3, 2, 1])
with tempfile.NamedTemporaryFile() as f:
if tf.gfile.Exists('stl10/stl10_binary.tar.gz'):
f = tf.gfile.Open('stl10/stl10_binary.tar.gz', 'rb')
else:
request.urlretrieve(URLS['stl10'], f.name)
tar = tarfile.open(fileobj=f)
train_X = tar.extractfile('stl10_binary/train_X.bin')
train_y = tar.extractfile('stl10_binary/train_y.bin')
test_X = tar.extractfile('stl10_binary/test_X.bin')
test_y = tar.extractfile('stl10_binary/test_y.bin')
unlabeled_X = tar.extractfile('stl10_binary/unlabeled_X.bin')
train_set = {
'images': np.frombuffer(train_X.read(), dtype=np.uint8),
'labels': np.frombuffer(train_y.read(), dtype=np.uint8) - 1
}
test_set = {
'images': np.frombuffer(test_X.read(), dtype=np.uint8),
'labels': np.frombuffer(test_y.read(), dtype=np.uint8) - 1
}
_imgs = np.frombuffer(unlabeled_X.read(), dtype=np.uint8)
unlabeled_set = {
'images': _imgs,
'labels': np.zeros(100000, dtype=np.uint8)
}
fold_indices = tar.extractfile('stl10_binary/fold_indices.txt').read()
train_set['images'] = _encode_png(unflatten(train_set['images']))
test_set['images'] = _encode_png(unflatten(test_set['images']))
unlabeled_set['images'] = _encode_png(unflatten(unlabeled_set['images']))
return dict(
train=train_set,
test=test_set,
unlabeled=unlabeled_set,
files=[EasyDict(filename="stl10_fold_indices.txt", data=fold_indices)])
def model(self, batch, lr, wd, ema, warmup_pos, vat, vat_eps, entmin_weight, **kwargs):
hwc = [self.dataset.height, self.dataset.width, self.dataset.colors]
xt_in = tf.placeholder(tf.float32, [batch] + hwc, 'xt') # For training
x_in = tf.placeholder(tf.float32, [None] + hwc, 'x')
y_in = tf.placeholder(tf.float32, [batch] + hwc, 'y')
l_in = tf.placeholder(tf.int32, [batch], 'labels')
wd *= lr
warmup = tf.clip_by_value(tf.to_float(self.step) / (warmup_pos * (FLAGS.train_kimg << 10)), 0, 1)
classifier = lambda x, **kw: self.classifier(x, **kw, **kwargs).logits
l = tf.one_hot(l_in, self.nclass)
logits_x = classifier(xt_in, training=True)
post_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS) # Take only first call to update batch norm.
logits_y = classifier(y_in, training=True)
delta_y = vat_utils.generate_perturbation(y_in, logits_y, lambda x: classifier(x, training=True), vat_eps)
logits_student = classifier(y_in + delta_y, training=True)
logits_teacher = tf.stop_gradient(logits_y)
loss_vat = layers.kl_divergence_from_logits(logits_student, logits_teacher)
loss_vat = tf.reduce_mean(loss_vat)
loss_entmin = tf.reduce_mean(tf.distributions.Categorical(logits=logits_y).entropy())
loss = tf.nn.softmax_cross_entropy_with_logits_v2(labels=l, logits=logits_x)
loss = tf.reduce_mean(loss)
tf.summary.scalar('losses/xe', loss)
tf.summary.scalar('losses/vat', loss_vat)
tf.summary.scalar('losses/entmin', loss_entmin)
ema = tf.train.ExponentialMovingAverage(decay=ema)
ema_op = ema.apply(utils.model_vars())
ema_getter = functools.partial(utils.getter_ema, ema)
post_ops.append(ema_op)
post_ops.extend([tf.assign(v, v * (1 - wd)) for v in utils.model_vars('classify') if 'kernel' in v.name])
train_op = tf.train.AdamOptimizer(lr).minimize(loss + loss_vat * warmup * vat + entmin_weight * loss_entmin,
colocate_gradients_with_ops=True)
with tf.control_dependencies([train_op]):
train_op = tf.group(*post_ops)
return EasyDict(
xt=xt_in, x=x_in, y=y_in, label=l_in, train_op=train_op,
classify_raw=tf.nn.softmax(classifier(x_in, training=False)), # No EMA, for debugging.
classify_op=tf.nn.softmax(classifier(x_in, getter=ema_getter, training=False)))
def classifier(self,
x,
scales,
filters,
repeat,
training,
getter=None,
dropout=0,
**kwargs):
del kwargs
leaky_relu = functools.partial(tf.nn.leaky_relu, alpha=0.1)
bn_args = dict(training=training, momentum=0.999)
def conv_args(k, f):
return dict(padding='same',
kernel_initializer=tf.random_normal_initializer(
stddev=tf.rsqrt(0.5 * k * k * f)))
def residual(x0, filters, stride=1, activate_before_residual=False):
x = leaky_relu(tf.layers.batch_normalization(x0, **bn_args))
if activate_before_residual:
x0 = x
x = tf.layers.conv2d(x,
filters,
3,
strides=stride,
**conv_args(3, filters))
x = leaky_relu(tf.layers.batch_normalization(x, **bn_args))
x = tf.layers.conv2d(x, filters, 3, **conv_args(3, filters))
if x0.get_shape()[3] != filters:
x0 = tf.layers.conv2d(x0,
filters,
1,
strides=stride,
**conv_args(1, filters))
return x0 + x
with tf.variable_scope('classify',
reuse=tf.AUTO_REUSE,
custom_getter=getter):
y = tf.layers.conv2d((x - self.dataset.mean) / self.dataset.std,
16, 3, **conv_args(3, 16))
for scale in range(scales):
y = residual(y,
filters << scale,
stride=2 if scale else 1,
activate_before_residual=scale == 0)
for i in range(repeat - 1):
y = residual(y, filters << scale)
y = leaky_relu(tf.layers.batch_normalization(y, **bn_args))
y = embeds = tf.reduce_mean(y, [1, 2])
if dropout and training:
y = tf.nn.dropout(y, 1 - dropout)
logits = tf.layers.dense(
y,
self.nclass,
kernel_initializer=tf.glorot_normal_initializer())
return EasyDict(logits=logits, embeds=embeds)
import functools
import itertools
import multiprocessing
import random
import numpy as np
import tensorflow as tf
from absl import flags
from libml import utils, ctaugment
from libml.utils import EasyDict
from third_party.auto_augment import augmentations, policies
FLAGS = flags.FLAGS
POOL = None
POLICIES = EasyDict(fixmatch_train=policies.cifar10_policies())
RANDOM_POLICY_OPS = (
'Identity', 'AutoContrast', 'Equalize', 'Rotate',
'Solarize', 'Color', 'Contrast', 'Brightness',
'Sharpness', 'ShearX', 'TranslateX', 'TranslateY',
'Posterize', 'ShearY'
)
AUGMENT_ENUM = 'd x m aa aac ra rac'.split() + ['r%d_%d_%d' % (nops, mag, cutout) for nops, mag, cutout in
itertools.product(range(1, 5), range(1, 16), range(0, 100, 25))] + [
'rac%d' % (mag) for mag in range(1, 10)]
flags.DEFINE_integer('K', 1, 'Number of strong augmentation for unlabeled data.')
flags.DEFINE_enum('augment', 'd.d',
[x + '.' + y for x, y in itertools.product(AUGMENT_ENUM, AUGMENT_ENUM)] +
[x + '.' + y + '.' + z for x, y, z in itertools.product(AUGMENT_ENUM, AUGMENT_ENUM, AUGMENT_ENUM)] + [
def model(self,
batch,
lr,
wd,
beta,
w_kl,
w_match,
w_rot,
K,
use_xe,
warmup_kimg=1024,
T=0.5,
mixmode='xxy.yxy',
dbuf=128,
ema=0.999,
**kwargs):
hwc = [self.dataset.height, self.dataset.width, self.dataset.colors]
xt_in = tf.placeholder(tf.float32, [batch] + hwc, 'xt') # For training
x_in = tf.placeholder(tf.float32, [None] + hwc, 'x')
y_in = tf.placeholder(tf.float32, [batch, K + 1] + hwc, 'y')
l_in = tf.placeholder(tf.int32, [batch], 'labels')
wd *= lr
w_match *= tf.clip_by_value(
tf.cast(self.step, tf.float32) / (warmup_kimg << 10), 0, 1)
augment = layers.MixMode(mixmode)
gpu = utils.get_gpu()
def classifier_to_gpu(x, **kw):
with tf.device(next(gpu)):
return self.classifier(x, **kw, **kwargs).logits
def random_rotate(x):
b4 = batch // 4
x, xt = x[:2 * b4], tf.transpose(x[2 * b4:], [0, 2, 1, 3])
l = np.zeros(b4, np.int32)
l = tf.constant(np.concatenate([l, l + 1, l + 2, l + 3], axis=0))
return tf.concat(
[x[:b4], x[b4:, ::-1, ::-1], xt[:b4, ::-1], xt[b4:, :, ::-1]],
axis=0), l
# Moving average of the current estimated label distribution
p_model = layers.PMovingAverage('p_model', self.nclass, dbuf)
p_target = layers.PMovingAverage(
'p_target', self.nclass,
dbuf) # Rectified distribution (only for plotting)
# Known (or inferred) true unlabeled distribution
p_data = layers.PData(self.dataset)
if w_rot > 0:
rot_y, rot_l = random_rotate(y_in[:, 1])
with tf.device(next(gpu)):
rot_logits = self.classifier_rot(
self.classifier(rot_y, training=True, **kwargs).embeds)
loss_rot = tf.nn.softmax_cross_entropy_with_logits_v2(
labels=tf.one_hot(rot_l, 4), logits=rot_logits)
loss_rot = tf.reduce_mean(loss_rot)
tf.summary.scalar('losses/rot', loss_rot)
else:
loss_rot = 0
if kwargs['redux'] == '1st' and w_kl <= 0:
logits_y = [classifier_to_gpu(y_in[:, 0], training=True)] * (K + 1)
elif kwargs['redux'] == '1st':
logits_y = [
classifier_to_gpu(y_in[:, i], training=True) for i in range(2)
]
logits_y += logits_y[:1] * (K - 1)
else:
logits_y = [
classifier_to_gpu(y_in[:, i], training=True)
for i in range(K + 1)
]
guess = self.guess_label(logits_y, p_data(), p_model(), T=T, **kwargs)
ly = tf.stop_gradient(guess.p_target)
if w_kl > 0:
w_kl *= tf.clip_by_value(
tf.cast(self.step, tf.float32) / (warmup_kimg << 10), 0, 1)
loss_kl = tf.nn.softmax_cross_entropy_with_logits_v2(
labels=ly[:batch], logits=logits_y[1])
loss_kl = tf.reduce_mean(loss_kl)
tf.summary.scalar('losses/kl', loss_kl)
else:
loss_kl = 0
del logits_y
lx = tf.one_hot(l_in, self.nclass)
xy, labels_xy = augment([xt_in] + [y_in[:, i] for i in range(K + 1)],
[lx] + tf.split(ly, K + 1), [beta, beta])
x, y = xy[0], xy[1:]
labels_x, labels_y = labels_xy[0], tf.concat(labels_xy[1:], 0)
del xy, labels_xy
batches = layers.interleave([x] + y, batch)
logits = [classifier_to_gpu(yi, training=True) for yi in batches[:-1]]
skip_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
logits.append(classifier_to_gpu(batches[-1], training=True))
post_ops = [
v for v in tf.get_collection(tf.GraphKeys.UPDATE_OPS)
if v not in skip_ops
]
logits = layers.interleave(logits, batch)
logits_x = logits[0]
logits_y = tf.concat(logits[1:], 0)
del batches, logits
loss_xe = tf.nn.softmax_cross_entropy_with_logits_v2(labels=labels_x,
logits=logits_x)
loss_xe = tf.reduce_mean(loss_xe)
if use_xe:
loss_xeu = tf.nn.softmax_cross_entropy_with_logits_v2(
labels=labels_y, logits=logits_y)
else:
loss_xeu = tf.square(labels_y - tf.nn.softmax(logits_y))
loss_xeu = tf.reduce_mean(loss_xeu)
tf.summary.scalar('losses/xe', loss_xe)
tf.summary.scalar('losses/%s' % ('xeu' if use_xe else 'l2u'), loss_xeu)
self.distribution_summary(p_data(), p_model(), p_target())
ema = tf.train.ExponentialMovingAverage(decay=ema)
ema_op = ema.apply(utils.model_vars())
ema_getter = functools.partial(utils.getter_ema, ema)
post_ops.extend([
ema_op,
p_model.update(guess.p_model),
p_target.update(guess.p_target)
])
if p_data.has_update:
post_ops.append(p_data.update(lx))
post_ops.extend([
tf.assign(v, v * (1 - wd)) for v in utils.model_vars('classify')
if 'kernel' in v.name
])
train_op = tf.train.AdamOptimizer(lr).minimize(
loss_xe + w_kl * loss_kl + w_match * loss_xeu + w_rot * loss_rot,
colocate_gradients_with_ops=True)
with tf.control_dependencies([train_op]):
train_op = tf.group(*post_ops)
return EasyDict(
xt=xt_in,
x=x_in,
y=y_in,
label=l_in,
train_op=train_op,
classify_op=tf.nn.softmax(
classifier_to_gpu(x_in, getter=ema_getter, training=False)),
classify_raw=tf.nn.softmax(classifier_to_gpu(
x_in, training=False))) # No EMA, for debugging.
import itertools
import multiprocessing
import random
import numpy as np
import tensorflow as tf
from absl import flags
from libml import utils, ctaugment
from libml.utils import EasyDict
from third_party.auto_augment import augmentations, policies
FLAGS = flags.FLAGS
POOL = None
POLICIES = EasyDict(cifar10=policies.cifar10_policies(),
cifar100=policies.cifar10_policies(),
svhn=policies.svhn_policies(),
svhn_noextra=policies.svhn_policies())
RANDOM_POLICY_OPS = ('Identity', 'AutoContrast', 'Equalize', 'Rotate',
'Solarize', 'Color', 'Contrast', 'Brightness',
'Sharpness', 'ShearX', 'TranslateX', 'TranslateY',
'Posterize', 'ShearY')
AUGMENT_ENUM = 'd x m aa aac ra rac'.split() + [
'r%d_%d_%d' % (nops, mag, cutout)
for nops, mag, cutout in itertools.product(range(1, 5), range(1, 16),
range(0, 100, 25))
] + ['rac%d' % (mag) for mag in range(1, 10)]
flags.DEFINE_integer('K', 1,
'Number of strong augmentation for unlabeled data.')
flags.DEFINE_enum(
import itertools
import multiprocessing
import random
import numpy as np
import tensorflow as tf
from absl import flags
from libml import utils, ctaugment
from libml.utils import EasyDict
from third_party.auto_augment import augmentations, policies
FLAGS = flags.FLAGS
POOL = None
POLICIES = EasyDict(cifar10=policies.cifar10_policies(),
svhn=policies.svhn_policies(),
svhn_noextra=policies.svhn_policies())
RANDOM_POLICY_OPS = (
'Identity', 'AutoContrast', 'Equalize', 'Rotate',
'Solarize', 'Color', 'Contrast', 'Brightness',
'Sharpness', 'ShearX', 'TranslateX', 'TranslateY',
'Posterize', 'ShearY'
)
AUGMENT_ENUM = 'd x m aa'.split() + ['r%d_%d_%d' % (nops, mag, cutout) for nops, mag, cutout in
itertools.product(range(1, 5), range(1, 16), range(0, 100, 25))]
flags.DEFINE_integer('K', 1, 'Number of strong augmentation for unlabeled data.')
flags.DEFINE_enum('augment', 'd.d',
[x + '.' + y for x, y in itertools.product(AUGMENT_ENUM, AUGMENT_ENUM)] +
[x + '.' + y + '.' + z for x, y, z in itertools.product(AUGMENT_ENUM, 'dx', AUGMENT_ENUM)],
import numpy as np
import tensorflow as tf
from absl import flags
from libml import utils, ctaugment
from libml.utils import EasyDict
from third_party.auto_augment import augmentations, policies
FLAGS = flags.FLAGS
POOL = None
POLICIES = EasyDict(
cifar10=policies.cifar10_policies(),
cifar10p=policies.cifar10_policies(),
# color=policies.color_policies(),
cifar10imb=policies.cifar10_policies(),
cifar100=policies.cifar10_policies(),
svhn=policies.svhn_policies(),
svhnp=policies.svhn_policies(),
svhnp_noextra=policies.svhn_policies(),
svhn_noextra=policies.svhn_policies())
RANDOM_POLICY_OPS = ('Identity', 'AutoContrast', 'Equalize', 'Rotate',
'Solarize', 'Color', 'Contrast', 'Brightness',
'Sharpness', 'ShearX', 'TranslateX', 'TranslateY',
'Posterize', 'ShearY')
AUGMENT_ENUM = 'd x m aa aac aacc ra rac'.split() + [
'r%d_%d_%d' % (nops, mag, cutout)
for nops, mag, cutout in itertools.product(range(1, 5), range(1, 16),
range(0, 100, 25))
] + ['rac%d' % (mag) for mag in range(1, 10)]
def model(self, batch, lr, wd, ema, warmup_pos, consistency_weight,
threshold, **kwargs):
hwc = [self.dataset.height, self.dataset.width, self.dataset.colors]
xt_in = tf.placeholder(tf.float32, [batch] + hwc, 'xt') # For training
x_in = tf.placeholder(tf.float32, [None] + hwc, 'x')
y_in = tf.placeholder(tf.float32, [batch] + hwc, 'y')
l_in = tf.placeholder(tf.int32, [batch], 'labels')
l = tf.one_hot(l_in, self.nclass)
warmup = tf.clip_by_value(
tf.to_float(self.step) / (warmup_pos * (FLAGS.train_kimg << 10)),
0, 1)
lrate = tf.clip_by_value(
tf.to_float(self.step) / (FLAGS.train_kimg << 10), 0, 1)
lr *= tf.cos(lrate * (7 * np.pi) / (2 * 8))
tf.summary.scalar('monitors/lr', lr)
classifier = lambda x, **kw: self.classifier(x, **kw, **kwargs).logits
logits_x = classifier(xt_in, training=True)
post_ops = tf.get_collection(
tf.GraphKeys.UPDATE_OPS
) # Take only first call to update batch norm.
logits_y = classifier(y_in, training=True)
# Get the pseudo-label loss
loss_pl = tf.nn.sparse_softmax_cross_entropy_with_logits(
labels=tf.argmax(logits_y, axis=-1), logits=logits_y)
# Masks denoting which data points have high-confidence predictions
greater_than_thresh = tf.reduce_any(
tf.greater(tf.nn.softmax(logits_y), threshold),
axis=-1,
keepdims=True,
)
greater_than_thresh = tf.cast(greater_than_thresh, loss_pl.dtype)
# Only enforce the loss when the model is confident
loss_pl *= greater_than_thresh
# Note that we also average over examples without confident outputs;
# this is consistent with the realistic evaluation codebase
loss_pl = tf.reduce_mean(loss_pl)
loss = tf.nn.softmax_cross_entropy_with_logits_v2(labels=l,
logits=logits_x)
loss = tf.reduce_mean(loss)
tf.summary.scalar('losses/xe', loss)
tf.summary.scalar('losses/pl', loss_pl)
# L2 regularization
loss_wd = sum(
tf.nn.l2_loss(v) for v in utils.model_vars('classify')
if 'kernel' in v.name)
tf.summary.scalar('losses/wd', loss_wd)
ema = tf.train.ExponentialMovingAverage(decay=ema)
ema_op = ema.apply(utils.model_vars())
ema_getter = functools.partial(utils.getter_ema, ema)
post_ops.append(ema_op)
train_op = tf.train.MomentumOptimizer(
lr, 0.9, use_nesterov=True).minimize(
loss + loss_pl * warmup * consistency_weight + wd * loss_wd,
colocate_gradients_with_ops=True)
with tf.control_dependencies([train_op]):
train_op = tf.group(*post_ops)
return EasyDict(
xt=xt_in,
x=x_in,
y=y_in,
label=l_in,
train_op=train_op,
classify_raw=tf.nn.softmax(classifier(
x_in, training=False)), # No EMA, for debugging.
classify_op=tf.nn.softmax(
classifier(x_in, getter=ema_getter, training=False)))
def classifier(self,
x,
scales,
filters,
repeat,
training,
getter=None,
dropout=0,
**kwargs):
del kwargs
bn_args = dict(training=training, momentum=0.999)
def conv_args(k, f):
return dict(padding='same',
use_bias=False,
kernel_initializer=tf.random_normal_initializer(
stddev=tf.rsqrt(0.5 * k * k * f)))
def residual(x0, filters, stride=1):
def branch():
x = tf.nn.relu(x0)
x = tf.layers.conv2d(x,
filters,
3,
strides=stride,
**conv_args(3, filters))
x = tf.nn.relu(tf.layers.batch_normalization(x, **bn_args))
x = tf.layers.conv2d(x, filters, 3, **conv_args(3, filters))
x = tf.layers.batch_normalization(x, **bn_args)
return x
x = layers.shakeshake(branch(), branch(), training)
if stride == 2:
x1 = tf.layers.conv2d(tf.nn.relu(x0[:, ::2, ::2]),
filters >> 1, 1,
**conv_args(1, filters >> 1))
x2 = tf.layers.conv2d(tf.nn.relu(x0[:, 1::2, 1::2]),
filters >> 1, 1,
**conv_args(1, filters >> 1))
x0 = tf.concat([x1, x2], axis=3)
x0 = tf.layers.batch_normalization(x0, **bn_args)
elif x0.get_shape()[3] != filters:
x0 = tf.layers.conv2d(x0, filters, 1, **conv_args(1, filters))
x0 = tf.layers.batch_normalization(x0, **bn_args)
return x0 + x
with tf.variable_scope('classify',
reuse=tf.AUTO_REUSE,
custom_getter=getter):
y = tf.layers.conv2d((x - self.dataset.mean) / self.dataset.std,
16, 3, **conv_args(3, 16))
for scale, i in itertools.product(range(scales), range(repeat)):
with tf.variable_scope('layer%d.%d' % (scale + 1, i)):
if i == 0:
y = residual(y,
filters << scale,
stride=2 if scale else 1)
else:
y = residual(y, filters << scale)
y = embeds = tf.reduce_mean(y, [1, 2])
if dropout and training:
y = tf.nn.dropout(y, 1 - dropout)
logits = tf.layers.dense(
y,
self.nclass,
kernel_initializer=tf.glorot_normal_initializer())
return EasyDict(logits=logits, embeds=embeds)
def model(self,
batch,
lr,
wd,
ema,
beta,
w_match,
warmup_kimg=1024,
nu=2,
mixmode='xxy.yxy',
dbuf=128,
**kwargs):
hwc = [self.dataset.height, self.dataset.width, self.dataset.colors]
xt_in = tf.placeholder(tf.float32, [batch] + hwc, 'xt') # For training
x_in = tf.placeholder(tf.float32, [None] + hwc, 'x')
y_in = tf.placeholder(tf.float32, [batch, nu] + hwc, 'y')
l_in = tf.placeholder(tf.int32, [batch], 'labels')
wd *= lr
w_match *= tf.clip_by_value(
tf.cast(self.step, tf.float32) / (warmup_kimg << 10), 0, 1)
augment = MixMode(mixmode)
classifier = lambda x, **kw: self.classifier(x, **kw, **kwargs).logits
# Moving average of the current estimated label distribution
p_model = layers.PMovingAverage('p_model', self.nclass, dbuf)
p_target = layers.PMovingAverage(
'p_target', self.nclass,
dbuf) # Rectified distribution (only for plotting)
# Known (or inferred) true unlabeled distribution
p_data = layers.PData(self.dataset)
y = tf.reshape(tf.transpose(y_in, [1, 0, 2, 3, 4]), [-1] + hwc)
guess = self.guess_label(tf.split(y, nu), classifier, T=0.5, **kwargs)
ly = tf.stop_gradient(guess.p_target)
lx = tf.one_hot(l_in, self.nclass)
xy, labels_xy = augment([xt_in] + tf.split(y, nu), [lx] + [ly] * nu,
[beta, beta])
x, y = xy[0], xy[1:]
labels_x, labels_y = labels_xy[0], tf.concat(labels_xy[1:], 0)
del xy, labels_xy
batches = layers.interleave([x] + y, batch)
skip_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
logits = [classifier(batches[0], training=True)]
post_ops = [
v for v in tf.get_collection(tf.GraphKeys.UPDATE_OPS)
if v not in skip_ops
]
for batchi in batches[1:]:
logits.append(classifier(batchi, training=True))
logits = layers.interleave(logits, batch)
logits_x = logits[0]
logits_y = tf.concat(logits[1:], 0)
loss_xe = tf.nn.softmax_cross_entropy_with_logits_v2(labels=labels_x,
logits=logits_x)
loss_xe = tf.reduce_mean(loss_xe)
loss_l2u = tf.square(labels_y - tf.nn.softmax(logits_y))
loss_l2u = tf.reduce_mean(loss_l2u)
tf.summary.scalar('losses/xe', loss_xe)
tf.summary.scalar('losses/l2u', loss_l2u)
self.distribution_summary(p_data(), p_model(), p_target())
ema = tf.train.ExponentialMovingAverage(decay=ema)
ema_op = ema.apply(utils.model_vars())
ema_getter = functools.partial(utils.getter_ema, ema)
post_ops.extend([
ema_op,
p_model.update(guess.p_model),
p_target.update(guess.p_target)
])
if p_data.has_update:
post_ops.append(p_data.update(lx))
post_ops.extend([
tf.assign(v, v * (1 - wd)) for v in utils.model_vars('classify')
if 'kernel' in v.name
])
train_op = tf.train.AdamOptimizer(lr).minimize(
loss_xe + w_match * loss_l2u, colocate_gradients_with_ops=True)
with tf.control_dependencies([train_op]):
train_op = tf.group(*post_ops)
return EasyDict(
xt=xt_in,
x=x_in,
y=y_in,
label=l_in,
train_op=train_op,
classify_raw=tf.nn.softmax(classifier(
x_in, training=False)), # No EMA, for debugging.
classify_op=tf.nn.softmax(
classifier(x_in, getter=ema_getter, training=False)))