def main():
# Verify that parameters are set correctly.
args = parser.parse_args([])
# Possibly auto-generate the output filename.
if args.filename is None:
basename = os.path.basename(args.dataset)
args.filename = os.path.splitext(basename)[0] + '_embeddings.h5'
args.filename = os.path.join(args.experiment_root, args.filename)
_, data_fids = common.load_dataset(args.dataset, args.image_root)
net_input_size = (args.net_input_height, args.net_input_width)
# pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
# Setup a tf Dataset containing all images.
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
# Convert filenames to actual image tensors.
dataset = dataset.map(
lambda fid: common.fid_to_image(fid,
tf.constant('dummy'),
image_root=args.image_root,
image_size=net_input_size),
num_parallel_calls=args.loading_threads)
dataset = dataset.batch(args.batch_size)
# Overlap producing and consuming.
dataset = dataset.prefetch(1)
model = Trinet(args.embedding_dim)
# lr_schedule = tf.keras.optimizers.schedules.ExponentialDecay(args.learning_rate,args.train_iterations - args.decay_start_iteration, 0.001)
optimizer = tf.keras.optimizers.Adam()
ckpt = tf.train.Checkpoint(step=tf.Variable(0),
optimizer=optimizer,
net=model)
manager = tf.train.CheckpointManager(ckpt,
args.experiment_root,
max_to_keep=10)
ckpt.restore(manager.latest_checkpoint)
with h5py.File(args.filename, 'w') as f_out:
emb_storage = np.zeros((len(data_fids), args.embedding_dim),
np.float32)
start_idx = 0
for images, fids, pids in dataset:
emb = model(images, training=False)
emb_storage[start_idx:start_idx + len(emb)] = emb
start_idx += args.batch_size
emb_dataset = f_out.create_dataset('emb', data=emb_storage)
def main():
args = parser.parse_args()
# Data augmentation
global seq_geo
global seq_img
seq_geo = iaa.SomeOf(
(0, 5),
[
iaa.Fliplr(0.5), # horizontally flip 50% of the images
iaa.PerspectiveTransform(scale=(0, 0.075)),
iaa.Affine(
scale={
"x": (0.8, 1.0),
"y": (0.8, 1.0)
},
rotate=(-5, 5),
translate_percent={
"x": (-0.1, 0.1),
"y": (-0.1, 0.1)
},
), # rotate by -45 to +45 degrees),
iaa.Crop(pc=(
0, 0.125
)), # crop images from each side by 0 to 12.5% (randomly chosen)
iaa.CoarsePepper(p=0.01, size_percent=0.1)
],
random_order=False)
# Content transformation
seq_img = iaa.SomeOf(
(0, 3),
[
iaa.GaussianBlur(
sigma=(0, 1.0)), # blur images with a sigma of 0 to 2.0
iaa.ContrastNormalization(alpha=(0.9, 1.1)),
iaa.Grayscale(alpha=(0, 0.2)),
iaa.Multiply((0.9, 1.1))
])
# We store all arguments in a json file. This has two advantages:
# 1. We can always get back and see what exactly that experiment was
# 2. We can resume an experiment as-is without needing to remember all flags.
args_file = os.path.join(args.experiment_root, 'args.json')
if args.resume:
if not os.path.isfile(args_file):
raise IOError('`args.json` not found in {}'.format(args_file))
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
args_resumed['resume'] = True # This would be overwritten.
# When resuming, we not only want to populate the args object with the
# values from the file, but we also want to check for some possible
# conflicts between loaded and given arguments.
for key, value in args.__dict__.items():
if key in args_resumed:
resumed_value = args_resumed[key]
if resumed_value != value:
print('Warning: For the argument `{}` we are using the'
' loaded value `{}`. The provided value was `{}`'
'.'.format(key, resumed_value, value))
args.__dict__[key] = resumed_value
else:
print('Warning: A new argument was added since the last run:'
' `{}`. Using the new value: `{}`.'.format(key, value))
else:
# If the experiment directory exists already, we bail in fear.
if os.path.exists(args.experiment_root):
if os.listdir(args.experiment_root):
print('The directory {} already exists and is not empty.'
' If you want to resume training, append --resume to'
' your call.'.format(args.experiment_root))
exit(1)
else:
os.makedirs(args.experiment_root)
# Store the passed arguments for later resuming and grepping in a nice
# and readable format.
with open(args_file, 'w') as f:
json.dump(vars(args),
f,
ensure_ascii=False,
indent=2,
sort_keys=True)
log_file = os.path.join(args.experiment_root, "train")
logging.config.dictConfig(common.get_logging_dict(log_file))
log = logging.getLogger('train')
# Also show all parameter values at the start, for ease of reading logs.
log.info('Training using the following parameters:')
for key, value in sorted(vars(args).items()):
log.info('{}: {}'.format(key, value))
# Check them here, so they are not required when --resume-ing.
if not args.train_set:
parser.print_help()
log.error("You did not specify the `train_set` argument!")
sys.exit(1)
if not args.image_root:
parser.print_help()
log.error("You did not specify the required `image_root` argument!")
sys.exit(1)
# Load the data from the CSV file.
pids, fids = common.load_dataset(args.train_set, args.image_root)
max_fid_len = max(map(len, fids)) # We'll need this later for logfiles.
# Load feature embeddings
if args.hard_pool_size > 0:
with h5py.File(args.train_embeddings, 'r') as f_train:
train_embs = np.array(f_train['emb'])
f_dists = scipy.spatial.distance.cdist(train_embs, train_embs)
hard_ids = get_hard_id_pool(pids, f_dists, args.hard_pool_size)
# Setup a tf.Dataset where one "epoch" loops over all PIDS.
# PIDS are shuffled after every epoch and continue indefinitely.
unique_pids = np.unique(pids)
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
if args.hard_pool_size == 0:
dataset = dataset.take(
(len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(
None) # Repeat forever. Funny way of stating it.
else:
dataset = dataset.repeat(
None) # Repeat forever. Funny way of stating it.
dataset = dataset.map(lambda pid: sample_batch_ids_for_pid(
pid, all_pids=pids, batch_p=args.batch_p, all_hard_pids=hard_ids))
# Unbatch the P PIDs
dataset = dataset.apply(tf.contrib.data.unbatch())
# For every PID, get K images.
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids, all_pids=pids, batch_k=args.batch_k))
# Ungroup/flatten the batches for easy loading of the files.
dataset = dataset.apply(tf.contrib.data.unbatch())
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(lambda im, fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
if args.augment == False:
dataset = dataset.map(
lambda fid, pid: common.fid_to_image(fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size
if args.crop_augment else
net_input_size), #Ergys
num_parallel_calls=args.loading_threads)
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid: (
tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.random_crop(
im, net_input_size + (3, )), fid, pid))
else:
dataset = dataset.map(lambda im, fid, pid: common.fid_to_image(
fid, pid, image_root=args.image_root, image_size=net_input_size),
num_parallel_calls=args.loading_threads)
dataset = dataset.map(lambda im, fid, pid: (tf.py_func(
augment_images, [im], [tf.float32]), fid, pid))
dataset = dataset.map(lambda im, fid, pid: (tf.reshape(
im[0],
(args.net_input_height, args.net_input_width, 3)), fid, pid))
# Group it back into PK batches.
batch_size = args.batch_p * args.batch_k
dataset = dataset.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset = dataset.prefetch(batch_size * 2)
# Since we repeat the data infinitely, we only need a one-shot iterator.
images, fids, pids = dataset.make_one_shot_iterator().get_next()
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
# Feed the image through the model. The returned `body_prefix` will be used
# further down to load the pre-trained weights for all variables with this
# prefix.
endpoints, body_prefix = model.endpoints(images, is_training=True)
with tf.name_scope('head'):
endpoints = head.head(endpoints, args.embedding_dim, is_training=True)
# Create the loss in two steps:
# 1. Compute all pairwise distances according to the specified metric.
# 2. For each anchor along the first dimension, compute its loss.
dists = loss.cdist(endpoints['emb'], endpoints['emb'], metric=args.metric)
losses, train_top1, prec_at_k, _, neg_dists, pos_dists = loss.LOSS_CHOICES[
args.loss](dists,
pids,
args.margin,
batch_precision_at_k=args.batch_k - 1)
# Count the number of active entries, and compute the total batch loss.
num_active = tf.reduce_sum(tf.cast(tf.greater(losses, 1e-5), tf.float32))
loss_mean = tf.reduce_mean(losses)
# Some logging for tensorboard.
tf.summary.histogram('loss_distribution', losses)
tf.summary.scalar('loss', loss_mean)
tf.summary.scalar('batch_top1', train_top1)
tf.summary.scalar('batch_prec_at_{}'.format(args.batch_k - 1), prec_at_k)
tf.summary.scalar('active_count', num_active)
tf.summary.histogram('embedding_dists', dists)
tf.summary.histogram('embedding_pos_dists', pos_dists)
tf.summary.histogram('embedding_neg_dists', neg_dists)
tf.summary.histogram('embedding_lengths',
tf.norm(endpoints['emb_raw'], axis=1))
# Create the mem-mapped arrays in which we'll log all training detail in
# addition to tensorboard, because tensorboard is annoying for detailed
# inspection and actually discards data in histogram summaries.
if args.detailed_logs:
log_embs = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'embeddings'),
dtype=np.float32,
shape=(args.train_iterations, batch_size, args.embedding_dim))
log_loss = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'losses'),
dtype=np.float32,
shape=(args.train_iterations, batch_size))
log_fids = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'fids'),
dtype='S' + str(max_fid_len),
shape=(args.train_iterations, batch_size))
# These are collected here before we add the optimizer, because depending
# on the optimizer, it might add extra slots, which are also global
# variables, with the exact same prefix.
model_variables = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
body_prefix)
# Define the optimizer and the learning-rate schedule.
# Unfortunately, we get NaNs if we don't handle no-decay separately.
global_step = tf.Variable(0, name='global_step', trainable=False)
if 0 <= args.decay_start_iteration < args.train_iterations:
learning_rate = tf.train.exponential_decay(
args.learning_rate,
tf.maximum(0, global_step - args.decay_start_iteration),
args.train_iterations - args.decay_start_iteration, 0.001)
else:
learning_rate = args.learning_rate
tf.summary.scalar('learning_rate', learning_rate)
optimizer = tf.train.AdamOptimizer(learning_rate)
# Feel free to try others!
# optimizer = tf.train.AdadeltaOptimizer(learning_rate)
# Update_ops are used to update batchnorm stats.
with tf.control_dependencies(tf.get_collection(tf.GraphKeys.UPDATE_OPS)):
train_op = optimizer.minimize(loss_mean, global_step=global_step)
# Define a saver for the complete model.
checkpoint_saver = tf.train.Saver(max_to_keep=0)
with tf.Session() as sess:
if args.resume:
# In case we're resuming, simply load the full checkpoint to init.
last_checkpoint = tf.train.latest_checkpoint(args.experiment_root)
log.info('Restoring from checkpoint: {}'.format(last_checkpoint))
checkpoint_saver.restore(sess, last_checkpoint)
else:
# But if we're starting from scratch, we may need to load some
# variables from the pre-trained weights, and random init others.
sess.run(tf.global_variables_initializer())
if args.initial_checkpoint is not None:
saver = tf.train.Saver(model_variables)
saver.restore(sess, args.initial_checkpoint)
# In any case, we also store this initialization as a checkpoint,
# such that we could run exactly reproduceable experiments.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=0)
merged_summary = tf.summary.merge_all()
summary_writer = tf.summary.FileWriter(args.experiment_root,
sess.graph)
start_step = sess.run(global_step)
log.info('Starting training from iteration {}.'.format(start_step))
# Finally, here comes the main-loop. This `Uninterrupt` is a handy
# utility such that an iteration still finishes on Ctrl+C and we can
# stop the training cleanly.
with lb.Uninterrupt(sigs=[SIGINT, SIGTERM], verbose=True) as u:
for i in range(start_step, args.train_iterations):
# Compute gradients, update weights, store logs!
start_time = time.time()
_, summary, step, b_prec_at_k, b_embs, b_loss, b_fids = \
sess.run([train_op, merged_summary, global_step,
prec_at_k, endpoints['emb'], losses, fids])
elapsed_time = time.time() - start_time
# Compute the iteration speed and add it to the summary.
# We did observe some weird spikes that we couldn't track down.
summary2 = tf.Summary()
summary2.value.add(tag='secs_per_iter',
simple_value=elapsed_time)
summary_writer.add_summary(summary2, step)
summary_writer.add_summary(summary, step)
if args.detailed_logs:
log_embs[i], log_loss[i], log_fids[
i] = b_embs, b_loss, b_fids
# Do a huge print out of the current progress.
seconds_todo = (args.train_iterations - step) * elapsed_time
log.info(
'iter:{:6d}, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, '
'batch-p@{}: {:.2%}, ETA: {} ({:.2f}s/it)'.format(
step, float(np.min(b_loss)), float(np.mean(b_loss)),
float(np.max(b_loss)), args.batch_k - 1,
float(b_prec_at_k),
timedelta(seconds=int(seconds_todo)), elapsed_time))
sys.stdout.flush()
sys.stderr.flush()
# Save a checkpoint of training every so often.
if (args.checkpoint_frequency > 0
and step % args.checkpoint_frequency == 0):
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=step)
# Stop the main-loop at the end of the step, if requested.
if u.interrupted:
log.info("Interrupted on request!")
break
# Store one final checkpoint. This might be redundant, but it is crucial
# in case intermediate storing was disabled and it saves a checkpoint
# when the process was interrupted.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root, 'checkpoint'),
global_step=step)
def main():
args = parser.parse_args()
# We store all arguments in a json file. This has two advantages:
# 1. We can always get back and see what exactly that experiment was
# 2. We can resume an experiment as-is without needing to remember all flags.
args_file = os.path.join(args.experiment_root, 'args.json')
if args.resume:
if not os.path.isfile(args_file):
raise IOError('`args.json` not found in {}'.format(args_file))
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
args_resumed['resume'] = True # This would be overwritten.
# When resuming, we not only want to populate the args object with the
# values from the file, but we also want to check for some possible
# conflicts between loaded and given arguments.
for key, value in args.__dict__.items():
if key in args_resumed:
resumed_value = args_resumed[key]
if resumed_value != value:
print('Warning: For the argument `{}` we are using the'
' loaded value `{}`. The provided value was `{}`'
'.'.format(key, resumed_value, value))
comand = input('Would you like to restore it?(yes/no)')
if comand == 'yes':
args.__dict__[key] = resumed_value
print(
'For the argument `{}` we are using the loaded value `{}`.'
.format(key, args.__dict__[key]))
else:
print(
'For the argument `{}` we are using the provided value `{}`.'
.format(key, args.__dict__[key]))
else:
print('Warning: A new argument was added since the last run:'
' `{}`. Using the new value: `{}`.'.format(key, value))
os.remove(args_file)
with open(args_file, 'w') as f:
json.dump(vars(args),
f,
ensure_ascii=False,
indent=2,
sort_keys=True)
else:
# If the experiment directory exists already, we bail in fear.
if os.path.exists(args.experiment_root):
if os.listdir(args.experiment_root):
print('The directory {} already exists and is not empty.'
' If you want to resume training, append --resume to'
' your call.'.format(args.experiment_root))
exit(1)
else:
os.makedirs(args.experiment_root)
# Store the passed arguments for later resuming and grepping in a nice
# and readable format.
with open(args_file, 'w') as f:
json.dump(vars(args),
f,
ensure_ascii=False,
indent=2,
sort_keys=True)
log_file = os.path.join(args.experiment_root, "train")
logging.config.dictConfig(common.get_logging_dict(log_file))
log = logging.getLogger('train')
# Also show all parameter values at the start, for ease of reading logs.
log.info('Training using the following parameters:')
for key, value in sorted(vars(args).items()):
log.info('{}: {}'.format(key, value))
# Check them here, so they are not required when --resume-ing.
if not args.train_set:
parser.print_help()
log.error("You did not specify the `train_set` argument!")
sys.exit(1)
if not args.image_root:
parser.print_help()
log.error("You did not specify the required `image_root` argument!")
sys.exit(1)
######################################################################################
#prepare the training dataset
# Load the data from the TxT file. see Common.load_dataset function for details
pids_train, fids_train = common.load_dataset(args.train_set,
args.image_root)
max_fid_len = max(map(len,
fids_train)) # We'll need this later for logfiles.
# Setup a tf.Dataset where one "epoch" loops over all PIDS.
# PIDS are shuffled after every epoch and continue indefinitely.
unique_pids = np.unique(pids_train)
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
dataset = dataset.take((len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(None) # Repeat forever. Funny way of stating it.
# For every PID, get K images.
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids_train, all_pids=pids_train, batch_k=args.batch_k
)) # now the dataset has been modified as [selected_fids
# , pid] due to the return of the function 'sample_k_fids_for_pid'
# Ungroup/flatten the batches for easy loading of the files.
dataset = dataset.apply(tf.contrib.data.unbatch())
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(
lambda fid, pid: common.fid_to_image(fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.
crop_augment else net_input_size),
num_parallel_calls=args.loading_threads
) # now the dataset has been modified as [selected_images
# , fid， pid] due to the return of the function 'fid_to_image'
# Augment the data if specified by the arguments.
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid:
(tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.random_crop(
im, net_input_size + (3, )), fid, pid))
# Group it back into PK batches.
batch_size = args.batch_p * args.batch_k
dataset = dataset.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset = dataset.prefetch(1)
# Since we repeat the data infinitely, we only need a one-shot iterator.
images_train, fids_train, pids_train = dataset.make_one_shot_iterator(
).get_next()
########################################################################################################################
#prepare the validation set
pids_val, fids_val = common.load_dataset(args.validation_set,
args.validation_image_root)
# Setup a tf.Dataset where one "epoch" loops over all PIDS.
# PIDS are shuffled after every epoch and continue indefinitely.
unique_pids_val = np.unique(pids_val)
dataset_val = tf.data.Dataset.from_tensor_slices(unique_pids_val)
dataset_val = dataset_val.shuffle(len(unique_pids_val))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
dataset_val = dataset_val.take(
(len(unique_pids_val) // args.batch_p) * args.batch_p)
dataset_val = dataset_val.repeat(
None) # Repeat forever. Funny way of stating it.
# For every PID, get K images.
dataset_val = dataset_val.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids_val, all_pids=pids_val, batch_k=args.batch_k
)) # now the dataset has been modified as [selected_fids
# , pid] due to the return of the function 'sample_k_fids_for_pid'
# Ungroup/flatten the batches for easy loading of the files.
dataset_val = dataset_val.apply(tf.contrib.data.unbatch())
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset_val = dataset_val.map(
lambda fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.validation_image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads
) # now the dataset has been modified as [selected_images
# , fid， pid] due to the return of the function 'fid_to_image'
# Augment the data if specified by the arguments.
if args.flip_augment:
dataset_val = dataset_val.map(lambda im, fid, pid: (
tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset_val = dataset_val.map(lambda im, fid, pid: (tf.random_crop(
im, net_input_size + (3, )), fid, pid))
# Group it back into PK batches.
dataset_val = dataset_val.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset_val = dataset_val.prefetch(1)
# Since we repeat the data infinitely, we only need a one-shot iterator.
images_val, fids_val, pids_val = dataset_val.make_one_shot_iterator(
).get_next()
####################################################################################################################
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
# Feed the image through the model. The returned `body_prefix` will be used
# further down to load the pre-trained weights for all variables with this
# prefix.
input_images = tf.placeholder(
dtype=tf.float32,
shape=[None, args.net_input_height, args.net_input_width, 3],
name='input')
pids = tf.placeholder(dtype=tf.string, shape=[
None,
], name='pids')
fids = tf.placeholder(dtype=tf.string, shape=[
None,
], name='fids')
endpoints, body_prefix = model.endpoints(input_images, is_training=True)
with tf.name_scope('head'):
endpoints = head.head(endpoints, args.embedding_dim, is_training=True)
# Create the loss in two steps:
# 1. Compute all pairwise distances according to the specified metric.
# 2. For each anchor along the first dimension, compute its loss.
# dists = loss.cdist(endpoints['emb'], endpoints['emb'], metric=args.metric)
# losses, train_top1, prec_at_k, _, neg_dists, pos_dists = loss.LOSS_CHOICES[args.loss](
# dists, pids, args.margin, batch_precision_at_k=args.batch_k-1)
# # '_' stands for the boolean matrix shows topK where the correct match of the identities occurs
# shape=(batch_size,K)
# 更改
# loss1
dists1 = loss.cdist(endpoints['feature1'],
endpoints['feature1'],
metric=args.metric)
losses1, _, _, _, _, _ = loss.LOSS_CHOICES[args.loss](
dists1, pids, args.margin, batch_precision_at_k=args.batch_k - 1)
dists2 = loss.cdist(endpoints['feature2'],
endpoints['feature2'],
metric=args.metric)
losses2, _, _, _, _, _ = loss.LOSS_CHOICES[args.loss](
dists2, pids, args.margin, batch_precision_at_k=args.batch_k - 1)
dists3 = loss.cdist(endpoints['feature3'],
endpoints['feature3'],
metric=args.metric)
losses3, _, _, _, _, _ = loss.LOSS_CHOICES[args.loss](
dists3, pids, args.margin, batch_precision_at_k=args.batch_k - 1)
dists4 = loss.cdist(endpoints['feature4'],
endpoints['feature4'],
metric=args.metric)
losses4, _, _, _, _, _ = loss.LOSS_CHOICES[args.loss](
dists4, pids, args.margin, batch_precision_at_k=args.batch_k - 1)
dists_fu = loss.cdist(endpoints['fusion_layer'],
endpoints['fusion_layer'],
metric=args.metric)
losses_fu, train_top1, prec_at_k, _, neg_dists, pos_dists = loss.LOSS_CHOICES[
args.loss](dists_fu,
pids,
args.margin,
batch_precision_at_k=args.batch_k - 1)
losses = losses1 + losses2 + losses3 + losses4 + losses_fu
# 更改
#loss
# losses_fu, train_top1, prec_at_k, _, neg_dists, pos_dists = loss.LOSS_CHOICES[args.loss](
# endpoints,pids, model_type=args.model_name, metric=args.metric, batch_precision_at_k=args.batch_k - 1
# )
# Count the number of active entries, and compute the total batch loss.
num_active = tf.reduce_sum(tf.cast(tf.greater(losses, 1e-5), tf.float32))
# 此处losses即为 pospair 比 negpair+margin 还大的部分
loss_mean = tf.reduce_mean(losses)
# Some logging for tensorboard.
tf.summary.histogram('loss_distribution', losses)
tf.summary.scalar('loss', loss_mean)
tf.summary.scalar('batch_top1', train_top1)
tf.summary.scalar('batch_prec_at_{}'.format(args.batch_k - 1), prec_at_k)
tf.summary.scalar('active_count', num_active)
#tf.summary.histogram('embedding_dists', dists)
tf.summary.histogram('embedding_pos_dists', pos_dists)
tf.summary.histogram('embedding_neg_dists', neg_dists)
tf.summary.histogram('embedding_lengths',
tf.norm(endpoints['emb_raw'], axis=1))
# Create the mem-mapped arrays in which we'll log all training detail in
# addition to tensorboard, because tensorboard is annoying for detailed
# inspection and actually discards data in histogram summaries.
if args.detailed_logs:
log_embs = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'embeddings'),
dtype=np.float32,
shape=(args.train_iterations, batch_size, args.embedding_dim))
log_loss = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'losses'),
dtype=np.float32,
shape=(args.train_iterations, batch_size))
log_fids = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'fids'),
dtype='S' + str(max_fid_len),
shape=(args.train_iterations, batch_size))
# These are collected here before we add the optimizer, because depending
# on the optimizer, it might add extra slots, which are also global
# variables, with the exact same prefix.
model_variables = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
body_prefix)
# Define the optimizer and the learning-rate schedule.
# Unfortunately, we get NaNs if we don't handle no-decay separately.
global_step = tf.Variable(
0, name='global_step',
trainable=False) # 'global_step' means the number of batches seen
# by graph
if 0 <= args.decay_start_iteration < args.train_iterations:
learning_rate = tf.train.exponential_decay(
args.learning_rate,
tf.maximum(0, global_step - args.decay_start_iteration
), # decay every 'lr_decay_steps' after the
# 'decay_start_iteration'
# args.train_iterations - args.decay_start_iteration, args.weight_decay_factor)
args.lr_decay_steps,
args.lr_decay_factor,
staircase=True)
else:
learning_rate = args.learning_rate # the case when we set 'decay_start_iteration' as -1
tf.summary.scalar('learning_rate', learning_rate)
optimizer = tf.train.AdamOptimizer(learning_rate, epsilon=1e-3)
# Feel free to try others!
# optimizer = tf.train.AdadeltaOptimizer(learning_rate)
# Update_ops are used to update batchnorm stats.
with tf.control_dependencies(tf.get_collection(tf.GraphKeys.UPDATE_OPS)):
train_op = optimizer.minimize(loss_mean, global_step=global_step)
# Define a saver for the complete model.
checkpoint_saver = tf.train.Saver(max_to_keep=0)
with tf.Session(config=config) as sess:
if args.resume:
# In case we're resuming, simply load the full checkpoint to init.
if args.checkpoint is None:
last_checkpoint = tf.train.latest_checkpoint(
args.experiment_root)
log.info(
'Restoring from checkpoint: {}'.format(last_checkpoint))
checkpoint_saver.restore(sess, last_checkpoint)
else:
ckpt_path = os.path.join(args.experiment_root, args.checkpoint)
log.info('Restoring from checkpoint: {}'.format(
args.checkpoint))
checkpoint_saver.restore(sess, ckpt_path)
else:
# But if we're starting from scratch, we may need to load some
# variables from the pre-trained weights, and random init others.
sess.run(tf.global_variables_initializer())
if args.initial_checkpoint is not None:
saver = tf.train.Saver(model_variables)
saver.restore(
sess, args.initial_checkpoint
) # restore the pre-trained parameter from online model
# In any case, we also store this initialization as a checkpoint,
# such that we could run exactly reproduceable experiments.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=0)
merged_summary = tf.summary.merge_all()
summary_writer = tf.summary.FileWriter(args.experiment_root,
sess.graph)
start_step = sess.run(global_step)
log.info('Starting training from iteration {}.'.format(start_step))
# Finally, here comes the main-loop. This `Uninterrupt` is a handy
# utility such that an iteration still finishes on Ctrl+C and we can
# stop the training cleanly.
with lb.Uninterrupt(sigs=[SIGINT, SIGTERM], verbose=True) as u:
for i in range(start_step, args.train_iterations):
# Compute gradients, update weights, store logs!
start_time = time.time()
_, summary, step, b_prec_at_k, b_embs, b_loss, b_fids = \
sess.run([train_op, merged_summary, global_step,
prec_at_k, endpoints['emb'], losses, fids], feed_dict={input_images:images_train.eval(),
pids:pids_train.eval(),
fids:fids_train.eval()})
elapsed_time = time.time() - start_time
# Compute the iteration speed and add it to the summary.
# We did observe some weird spikes that we couldn't track down.
summary2 = tf.Summary()
summary2.value.add(tag='secs_per_iter',
simple_value=elapsed_time)
summary_writer.add_summary(summary2, step)
summary_writer.add_summary(summary, step)
if args.detailed_logs:
log_embs[i], log_loss[i], log_fids[
i] = b_embs, b_loss, b_fids
# Do a huge print out of the current progress.
seconds_todo = (args.train_iterations - step) * elapsed_time
log.info(
'iter:{:6d}, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, '
'batch-p@{}: {:.2%}, ETA: {} ({:.2f}s/it)'.format(
step, float(np.min(b_loss)), float(np.mean(b_loss)),
float(np.max(b_loss)), args.batch_k - 1,
float(b_prec_at_k),
timedelta(seconds=int(seconds_todo)), elapsed_time))
sys.stdout.flush()
sys.stderr.flush()
# Save a checkpoint of training every so often.
if (args.checkpoint_frequency > 0
and step % args.checkpoint_frequency == 0):
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=step)
#get validation results
if (args.validation_frequency > 0
and step % args.validation_frequency == 0):
b_prec_at_k_val, b_loss, b_fids = \
sess.run([prec_at_k, losses, fids], feed_dict={input_images : images_val.eval(),
pids:pids_val.eval(),
fids:fids_val.eval()})
log.info(
'Validation @:{:6d} iteration, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, '
'batch-p@{}: {:.2%}'.format(step,
float(np.min(b_loss)),
float(np.mean(b_loss)),
float(np.max(b_loss)),
args.batch_k - 1,
float(b_prec_at_k_val)))
sys.stdout.flush()
sys.stderr.flush()
summary3 = tf.Summary()
summary3.value.add(tag='secs_per_iter',
simple_value=float(np.mean(b_loss)))
summary_writer.add_summary(summary3, step)
summary_writer.add_summary(summary3, step)
# Stop the main-loop at the end of the step, if requested.
if u.interrupted:
log.info("Interrupted on request!")
break
# Store one final checkpoint. This might be redundant, but it is crucial
# in case intermediate storing was disabled and it saves a checkpoint
# when the process was interrupted.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root, 'checkpoint'),
global_step=step)
def calculate_emb_for_fids(args, data_fids):
'''
Calculate embeddings
:param args: input arguments
:param data_fids: relative paths to the imagies
:return: matrix with shape len(data_fids) x embedding_dim (embedding vector for each image - one row)
'''
###################################################################################################################
# LOAD DATA
###################################################################################################################
# Load the args from the original experiment.
net_input_height = 256
net_input_width = 128
pre_crop_height = 288
pre_crop_width = 144
net_input_size = (net_input_height, net_input_width)
pre_crop_size = (pre_crop_height, pre_crop_width)
###################################################################################################################
# PREPARE DATA
###################################################################################################################
# Setup a tf Dataset containing all images.
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
# Convert filenames to actual image tensors.
# dataset tensor: [image_resized, fid, pid]
dataset = dataset.map(
lambda fid: common.fid_to_image(fid,
tf.constant("dummy", dtype=tf.string),
image_root=args.image_root,
image_size=pre_crop_size),
num_parallel_calls=8)
# Augment the data if specified by the arguments.
# `modifiers` is a list of strings that keeps track of which augmentations
# have been applied, so that a human can understand it later on.
modifiers = ['original']
dataset = dataset.map(flip_augment)
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [o + m for m in ['', '_flip'] for o in modifiers]
dataset = dataset.map(lambda im, fid, pid:
(tf.stack(five_crops(im, net_input_size)),
tf.stack([fid] * 5), tf.stack([pid] * 5)))
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [
o + m for o in modifiers for m in [
'_center', '_top_left', '_top_right', '_bottom_left',
'_bottom_right'
]
]
# Group it back into PK batches.
dataset = dataset.batch(256)
# Overlap producing and consuming.
dataset = dataset.prefetch(1)
images, _, _ = dataset.make_one_shot_iterator().get_next()
###################################################################################################################
# CREATE MODEL
###################################################################################################################
# Get the weights
model = import_module('nets.resnet_v1_50')
embedding_dim = 128
block4_units = 1
endpoints = model.endpoints(images,
block4_units=block4_units,
is_training=False,
embedding_dim=embedding_dim)
with tf.Session() as sess:
# Initialize the network/load the checkpoint.
print('Restoring from checkpoint: {}'.format(args.checkpoint))
tf.train.Saver().restore(sess, args.checkpoint)
# Go ahead and embed the whole dataset, with all augmented versions too.
emb_storage = np.zeros(
(len(data_fids) * len(modifiers), embedding_dim), np.float32)
for start_idx in count(step=256):
try:
emb = sess.run(endpoints['emb'])
print('\rEmbedded batch {}-{}/{}'.format(
start_idx, start_idx + len(emb), len(emb_storage)),
flush=True,
end='')
emb_storage[start_idx:start_idx + len(emb)] = emb
except tf.errors.OutOfRangeError:
break # This just indicates the end of the dataset.
print()
print("Done with embedding, aggregating augmentations...", flush=True)
# Pull out the augmentations into a separate first dimension.
emb_storage = emb_storage.reshape(len(data_fids), len(modifiers), -1)
emb_storage = emb_storage.transpose((1, 0, 2)) # (Aug,FID,128D)
# Aggregate according to the specified parameter.
emb_storage = np.mean(emb_storage, axis=0)
tf.reset_default_graph()
return emb_storage
def main(argv):
args = parser.parse_args(argv)
if args.gpu:
os.environ['CUDA_VISIBLE_DEVICES'] = args.gpu
# We store all arguments in a json file. This has two advantages:
# 1. We can always get back and see what exactly that experiment was
# 2. We can resume an experiment as-is without needing to remember all flags.
args_file = os.path.join(args.experiment_root, 'args.json')
if args.resume:
if not os.path.isfile(args_file):
raise IOError('`args.json` not found in {}'.format(args_file))
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
args_resumed['resume'] = True # This would be overwritten.
# When resuming, we not only want to populate the args object with the
# values from the file, but we also want to check for some possible
# conflicts between loaded and given arguments.
for key, value in args.__dict__.items():
if key in args_resumed:
resumed_value = args_resumed[key]
if resumed_value != value:
print('Warning: For the argument `{}` we are using the'
' loaded value `{}`. The provided value was `{}`'
'.'.format(key, resumed_value, value))
args.__dict__[key] = resumed_value
else:
print('Warning: A new argument was added since the last run:'
' `{}`. Using the new value: `{}`.'.format(key, value))
else:
# If the experiment directory exists already, we bail in fear.
if os.path.exists(args.experiment_root):
if os.listdir(args.experiment_root):
print('The directory {} already exists and is not empty.'
' If you want to resume training, append --resume to'
' your call.'.format(args.experiment_root))
exit(1)
else:
os.makedirs(args.experiment_root)
# Store the passed arguments for later resuming and grepping in a nice
# and readable format.
with open(args_file, 'w') as f:
json.dump(vars(args),
f,
ensure_ascii=False,
indent=2,
sort_keys=True)
log_file = os.path.join(args.experiment_root, "train")
logging.config.dictConfig(common.get_logging_dict(log_file))
log = logging.getLogger('train')
# Also show all parameter values at the start, for ease of reading logs.
log.info('Training using the following parameters:')
for key, value in sorted(vars(args).items()):
log.info('{}: {}'.format(key, value))
# Check them here, so they are not required when --resume-ing.
if not args.train_set:
parser.print_help()
log.error("You did not specify the `train_set` argument!")
sys.exit(1)
if not args.image_root:
parser.print_help()
log.error("You did not specify the required `image_root` argument!")
sys.exit(1)
# Load the data from the CSV file.
pids, fids = common.load_dataset(args.train_set, args.image_root)
max_fid_len = max(map(len, fids)) # We'll need this later for logfiles.
# Setup a tf.Dataset where one "epoch" loops over all PIDS.
# PIDS are shuffled after every epoch and continue indefinitely.
unique_pids = np.unique(pids)
if len(unique_pids) < args.batch_p:
unique_pids = np.tile(unique_pids,
int(np.ceil(args.batch_p / len(unique_pids))))
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
dataset = dataset.take((len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(None) # Repeat forever. Funny way of stating it.
# For every PID, get K images.
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids, all_pids=pids, batch_k=args.batch_k))
# Ungroup/flatten the batches for easy loading of the files.
dataset = dataset.apply(tf.contrib.data.unbatch())
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(lambda fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
dataset = dataset.map(
lambda im, fid, pid: common.fid_to_image(fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size
if args.crop_augment else
net_input_size), # Ergys
num_parallel_calls=args.loading_threads)
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid:
(tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.random_crop(
im, net_input_size + (3, )), fid, pid))
# Group it back into PK batches.
batch_size = args.batch_p * args.batch_k
dataset = dataset.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset = dataset.prefetch(1)
# Since we repeat the data infinitely, we only need a one-shot iterator.
images, fids, pids = dataset.make_one_shot_iterator().get_next()
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
# Feed the image through the model. The returned `body_prefix` will be used
# further down to load the pre-trained weights for all variables with this
# prefix.
weight_decay = 10e-4
weights_regularizer = tf.contrib.layers.l2_regularizer(scale=weight_decay)
endpoints, body_prefix = model.endpoints(images, is_training=True)
with tf.name_scope('head'):
endpoints = head.head(endpoints,
args.embedding_dim,
is_training=True,
weights_regularizer=weights_regularizer)
# Create the loss in two steps:
# 1. Compute all pairwise distances according to the specified metric.
# 2. For each anchor along the first dimension, compute its loss.
# batch_embedding = endpoints['emb']
batch_embedding = endpoints['emb']
if args.loss == 'semi_hard_triplet':
triplet_loss = triplet_semihard_loss(batch_embedding, pids,
args.margin)
elif args.loss == 'hard_triplet':
triplet_loss = batch_hard(batch_embedding, pids, args.margin,
args.metric)
elif args.loss == 'lifted_loss':
triplet_loss = lifted_loss(pids, batch_embedding, margin=args.margin)
elif args.loss == 'contrastive_loss':
assert batch_size % 2 == 0
assert args.batch_k == 4 ## Can work with other number but will need tuning
contrastive_idx = np.tile([0, 1, 4, 3, 2, 5, 6, 7], args.batch_p // 2)
for i in range(args.batch_p // 2):
contrastive_idx[i * 8:i * 8 + 8] += i * 8
contrastive_idx = np.expand_dims(contrastive_idx, 1)
batch_embedding_ordered = tf.gather_nd(batch_embedding,
contrastive_idx)
pids_ordered = tf.gather_nd(pids, contrastive_idx)
# batch_embedding_ordered = tf.Print(batch_embedding_ordered,[pids_ordered],'pids_ordered :: ',summarize=1000)
embeddings_anchor, embeddings_positive = tf.unstack(
tf.reshape(batch_embedding_ordered, [-1, 2, args.embedding_dim]),
2, 1)
# embeddings_anchor = tf.Print(embeddings_anchor,[pids_ordered,embeddings_anchor,embeddings_positive,batch_embedding,batch_embedding_ordered],"Tensors ", summarize=1000)
fixed_labels = np.tile([1, 0, 0, 1], args.batch_p // 2)
# fixed_labels = np.reshape(fixed_labels,(len(fixed_labels),1))
# print(fixed_labels)
labels = tf.constant(fixed_labels)
# labels = tf.Print(labels,[labels],'labels ',summarize=1000)
triplet_loss = contrastive_loss(labels,
embeddings_anchor,
embeddings_positive,
margin=args.margin)
elif args.loss == 'angular_loss':
embeddings_anchor, embeddings_positive = tf.unstack(
tf.reshape(batch_embedding, [-1, 2, args.embedding_dim]), 2, 1)
# pids = tf.Print(pids, [pids], 'pids:: ', summarize=100)
pids, _ = tf.unstack(tf.reshape(pids, [-1, 2, 1]), 2, 1)
# pids = tf.Print(pids,[pids],'pids:: ',summarize=100)
triplet_loss = angular_loss(pids,
embeddings_anchor,
embeddings_positive,
batch_size=args.batch_p,
with_l2reg=True)
elif args.loss == 'npairs_loss':
assert args.batch_k == 2 ## Single positive pair per class
embeddings_anchor, embeddings_positive = tf.unstack(
tf.reshape(batch_embedding, [-1, 2, args.embedding_dim]), 2, 1)
pids, _ = tf.unstack(tf.reshape(pids, [-1, 2, 1]), 2, 1)
pids = tf.reshape(pids, [-1])
triplet_loss = npairs_loss(pids, embeddings_anchor,
embeddings_positive)
else:
raise NotImplementedError('loss function {} NotImplemented'.format(
args.loss))
loss_mean = tf.reduce_mean(triplet_loss)
# These are collected here before we add the optimizer, because depending
# on the optimizer, it might add extra slots, which are also global
# variables, with the exact same prefix.
model_variables = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
body_prefix)
# Define the optimizer and the learning-rate schedule.
# Unfortunately, we get NaNs if we don't handle no-decay separately.
global_step = tf.Variable(0, name='global_step', trainable=False)
if 0 <= args.decay_start_iteration < args.train_iterations:
learning_rate = tf.train.polynomial_decay(args.learning_rate,
global_step,
args.train_iterations,
end_learning_rate=1e-7,
power=1)
else:
learning_rate = args.learning_rate
if args.optimizer == 'adam':
optimizer = tf.train.AdamOptimizer(learning_rate)
elif args.optimizer == 'momentum':
optimizer = tf.train.MomentumOptimizer(learning_rate, momentum=0.9)
else:
raise NotImplementedError('Invalid optimizer {}'.format(
args.optimizer))
#
# learning_rate = tf.train.polynomial_decay(args.learning_rate, global_step,
# args.train_iterations, end_learning_rate= 1e-7,
# power=1)
#
# Feel free to try others!
# optimizer = tf.train.AdadeltaOptimizer(learning_rate)
# Update_ops are used to update batchnorm stats.
with tf.control_dependencies(tf.get_collection(tf.GraphKeys.UPDATE_OPS)):
train_op = optimizer.minimize(loss_mean, global_step=global_step)
# Define a saver for the complete model.
checkpoint_saver = tf.train.Saver(max_to_keep=2)
gpu_options = tf.GPUOptions(allow_growth=True)
gpu_config = tf.ConfigProto(gpu_options=gpu_options)
with tf.Session(config=gpu_config) as sess:
if args.resume:
# In case we're resuming, simply load the full checkpoint to init.
last_checkpoint = tf.train.latest_checkpoint(args.experiment_root)
if last_checkpoint == None:
print('Resume with No previous checkpoint')
# But if we're starting from scratch, we may need to load some
# variables from the pre-trained weights, and random init others.
sess.run(tf.global_variables_initializer())
if args.initial_checkpoint is not None:
saver = tf.train.Saver(model_variables)
saver.restore(sess, args.initial_checkpoint)
# In any case, we also store this initialization as a checkpoint,
# such that we could run exactly reproduceable experiments.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=0)
else:
log.info(
'Restoring from checkpoint: {}'.format(last_checkpoint))
checkpoint_saver.restore(sess, last_checkpoint)
else:
# But if we're starting from scratch, we may need to load some
# variables from the pre-trained weights, and random init others.
sess.run(tf.global_variables_initializer())
if args.initial_checkpoint is not None:
saver = tf.train.Saver(model_variables)
saver.restore(sess, args.initial_checkpoint)
# In any case, we also store this initialization as a checkpoint,
# such that we could run exactly reproduceable experiments.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=0)
start_step = sess.run(global_step)
log.info('Starting training from iteration {}.'.format(start_step))
# Finally, here comes the main-loop. This `Uninterrupt` is a handy
# utility such that an iteration still finishes on Ctrl+C and we can
# stop the training cleanly.
with lb.Uninterrupt(sigs=[SIGINT, SIGTERM], verbose=True) as u:
for i in range(start_step, args.train_iterations):
# Compute gradients, update weights, store logs!
start_time = time.time()
_, step, b_embs, b_loss, b_fids = \
sess.run([train_op, global_step, endpoints['emb'], triplet_loss, fids])
elapsed_time = time.time() - start_time
# Do a huge print out of the current progress.
seconds_todo = (args.train_iterations - step) * elapsed_time
log.info(
'iter:{:6d}, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, ETA: {} ({:.2f}s/it)'
.format(
step,
float(np.min(b_loss)),
float(np.mean(b_loss)),
float(np.max(b_loss)),
# args.batch_k - 1, float(b_prec_at_k),
timedelta(seconds=int(seconds_todo)),
elapsed_time))
sys.stdout.flush()
sys.stderr.flush()
# Save a checkpoint of training every so often.
if (args.checkpoint_frequency > 0
and step % args.checkpoint_frequency == 0):
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=step)
# Stop the main-loop at the end of the step, if requested.
if u.interrupted:
log.info("Interrupted on request!")
break
# Store one final checkpoint. This might be redundant, but it is crucial
# in case intermediate storing was disabled and it saves a checkpoint
# when the process was interrupted.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root, 'checkpoint'),
global_step=step)
def main():
args = parser.parse_args()
# We store all arguments in a json file. This has two advantages:
# 1. We can always get back and see what exactly that experiment was
# 2. We can resume an experiment as-is without needing to remember all flags.
args_file = os.path.join(args.experiment_root, 'args.json')
if args.resume:
if not os.path.isfile(args_file):
raise IOError('`args.json` not found in {}'.format(args_file))
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
args_resumed['resume'] = True # This would be overwritten.
# When resuming, we not only want to populate the args object with the
# values from the file, but we also want to check for some possible
# conflicts between loaded and given arguments.
for key, value in args.__dict__.items():
if key in args_resumed:
resumed_value = args_resumed[key]
if resumed_value != value:
print('Warning: For the argument `{}` we are using the'
' loaded value `{}`. The provided value was `{}`'
'.'.format(key, resumed_value, value))
args.__dict__[key] = resumed_value
else:
print('Warning: A new argument was added since the last run:'
' `{}`. Using the new value: `{}`.'.format(key, value))
else:
# If the experiment directory exists already, we bail in fear.
if os.path.exists(args.experiment_root):
if os.listdir(args.experiment_root):
print('The directory {} already exists and is not empty.'
' If you want to resume training, append --resume to'
' your call.'.format(args.experiment_root))
exit(1)
else:
os.makedirs(args.experiment_root)
# Store the passed arguments for later resuming and grepping in a nice
# and readable format.
with open(args_file, 'w') as f:
json.dump(vars(args),
f,
ensure_ascii=False,
indent=2,
sort_keys=True)
log_file = os.path.join(args.experiment_root, "train")
logging.config.dictConfig(common.get_logging_dict(log_file))
log = logging.getLogger('train')
# Also show all parameter values at the start, for ease of reading logs.
log.info('Training using the following parameters:')
for key, value in sorted(vars(args).items()):
log.info('{}: {}'.format(key, value))
# Check them here, so they are not required when --resume-ing.
if not args.train_set:
parser.print_help()
log.error("You did not specify the `train_set` argument!")
sys.exit(1)
if not args.image_root:
parser.print_help()
log.error("You did not specify the required `image_root` argument!")
sys.exit(1)
# Load the data from the CSV file.
pids, fids = common.load_dataset(args.train_set, args.image_root)
max_fid_len = max(map(len, fids)) # We'll need this later for logfiles.
# Setup a tf.Dataset where one "epoch" loops over all PIDS.
# PIDS are shuffled after every epoch and continue indefinitely.
unique_pids = np.unique(pids)
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
dataset = dataset.take((len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(None) # Repeat forever. Funny way of stating it.
# For every PID, get K images.
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids, all_pids=pids, batch_k=args.batch_k))
# Ungroup/flatten the batches for easy loading of the files.
dataset = dataset.apply(tf.contrib.data.unbatch())
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(lambda fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid:
(tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.random_crop(
im, net_input_size + (3, )), fid, pid))
# Group it back into PK batches.
batch_size = args.batch_p * args.batch_k
dataset = dataset.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset = dataset.prefetch(1)
# Since we repeat the data infinitely, we only need a one-shot iterator.
images, fids, pids = dataset.make_one_shot_iterator().get_next()
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
# Feed the image through the model. The returned `body_prefix` will be used
# further down to load the pre-trained weights for all variables with this
# prefix.
endpoints, body_prefix = model.endpoints(images, is_training=True)
with tf.name_scope('head'):
endpoints = head.head(endpoints, args.embedding_dim, is_training=True)
# Create the loss in two steps:
# 1. Compute all pairwise distances according to the specified metric.
# 2. For each anchor along the first dimension, compute its loss.
dists = loss.cdist(endpoints['emb'], endpoints['emb'], metric=args.metric)
losses, train_top1, prec_at_k, _, neg_dists, pos_dists = loss.LOSS_CHOICES[
args.loss](dists,
pids,
args.margin,
batch_precision_at_k=args.batch_k - 1)
decDense = tf.layers.dense(
inputs=endpoints['emb'], units=5120,
name='decDense') # ,activation = tf.nn.relu ################
unflat = tf.reshape(decDense, shape=[tf.shape(decDense)[0], 32, 16, 10])
unp3shape = tf.TensorShape(
[2 * di for di in unflat.get_shape().as_list()[1:-1]])
unPool3 = tf.image.resize_nearest_neighbor(unflat,
unp3shape,
name='unpool3')
deConv3 = tf.layers.conv2d(inputs=unPool3,
filters=64,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=tf.nn.relu,
name='deConv3')
unp2shape = tf.TensorShape(
[2 * di for di in deConv3.get_shape().as_list()[1:-1]])
unPool2 = tf.image.resize_nearest_neighbor(deConv3,
unp2shape,
name='unpool2')
deConv2 = tf.layers.conv2d(inputs=unPool2,
filters=32,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=tf.nn.relu,
name='deConv2')
unp1shape = tf.TensorShape(
[2 * di for di in deConv2.get_shape().as_list()[1:-1]])
unPool1 = tf.image.resize_nearest_neighbor(deConv2,
unp1shape,
name='unpool1')
deConv1 = tf.layers.conv2d(inputs=unPool1,
filters=3,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=None,
name='deConv1')
imClip = deConv1 #tf.clip_by_value(t = deConv1,clip_value_min = -1.0,clip_value_max = 1.0,name='clipRelu')
print('RconstructeddImage : ', imClip.name)
recLoss = tf.multiply(
0.01, tf.losses.mean_squared_error(
labels=images,
predictions=imClip,
))
print('recLoss : ', recLoss.name)
decDense1 = tf.layers.dense(
inputs=endpoints['emb'], units=5120,
name='decDense1') # ,activation = tf.nn.relu ################
unflat1 = tf.reshape(decDense1, shape=[tf.shape(decDense1)[0], 32, 16, 10])
unp3shape1 = tf.TensorShape(
[2 * di for di in unflat1.get_shape().as_list()[1:-1]])
unPool3_new = tf.image.resize_nearest_neighbor(unflat1,
unp3shape1,
name='unpool3_new')
deConv3_new = tf.layers.conv2d(inputs=unPool3_new,
filters=64,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=tf.nn.relu,
name='deConv3_new')
unp2shape_new = tf.TensorShape(
[2 * di for di in deConv3_new.get_shape().as_list()[1:-1]])
unPool2_new = tf.image.resize_nearest_neighbor(deConv3_new,
unp2shape_new,
name='unpool2_new')
deConv2_new = tf.layers.conv2d(inputs=unPool2_new,
filters=3,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=tf.nn.relu,
name='deConv2_new')
unp1shape_new = tf.TensorShape(
[2 * di for di in deConv2_new.get_shape().as_list()[1:-1]])
unPool1_new = tf.image.resize_nearest_neighbor(deConv2_new,
unp1shape_new,
name='unpool1_new')
deConv1_new = tf.layers.conv2d(inputs=unPool1_new,
filters=3,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=None,
name='deConv1_new')
imClip1 = deConv2_new
print('RconstructeddImage : ', imClip1.name)
print(imClip1.shape)
images2 = tf.image.resize_images(images, [128, 64])
print(images2.shape)
recLoss1 = tf.multiply(
0.01,
tf.losses.mean_squared_error(
labels=images2,
predictions=imClip1,
))
print('recLoss_new : ', recLoss1.name)
decDense2 = tf.layers.dense(
inputs=endpoints['emb'], units=5120,
name='decDense2') # ,activation = tf.nn.relu ################
unflat12 = tf.reshape(decDense2,
shape=[tf.shape(decDense2)[0], 32, 16, 10])
unp3shape12 = tf.TensorShape(
[2 * di for di in unflat12.get_shape().as_list()[1:-1]])
unPool3_new2 = tf.image.resize_nearest_neighbor(unflat12,
unp3shape12,
name='unpool3_new2')
deConv3_new2 = tf.layers.conv2d(inputs=unPool3_new2,
filters=3,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=tf.nn.relu,
name='deConv3_new2')
unp2shape_new2 = tf.TensorShape(
[2 * di for di in deConv3_new2.get_shape().as_list()[1:-1]])
unPool2_new2 = tf.image.resize_nearest_neighbor(deConv3_new2,
unp2shape_new2,
name='unpool2_new2')
imClip11 = deConv3_new2
images21 = tf.image.resize_images(images, [64, 32])
recLoss2 = tf.multiply(
0.01,
tf.losses.mean_squared_error(
labels=images21,
predictions=imClip11,
))
print('recLoss_new : ', recLoss2.name)
decDensel = tf.layers.dense(
inputs=endpoints['emb'], units=5120,
name='decDensel') # ,activation = tf.nn.relu ################
unflatl = tf.reshape(decDensel, shape=[tf.shape(decDensel)[0], 32, 16, 10])
unp3shapel = tf.TensorShape(
[2 * di for di in unflatl.get_shape().as_list()[1:-1]])
unPool3l = tf.image.resize_nearest_neighbor(unflatl,
unp3shapel,
name='unpool3l')
deConv3l = tf.layers.conv2d(inputs=unPool3l,
filters=64,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=tf.nn.relu,
name='deConv3l')
unp2shapel = tf.TensorShape(
[2 * di for di in deConv3l.get_shape().as_list()[1:-1]])
unPool2l = tf.image.resize_nearest_neighbor(deConv3l,
unp2shapel,
name='unpool2l')
deConv2l = tf.layers.conv2d(inputs=unPool2l,
filters=32,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=tf.nn.relu,
name='deConv2l')
unp1shapel = tf.TensorShape(
[2 * di for di in deConv2l.get_shape().as_list()[1:-1]])
unPool1l = tf.image.resize_nearest_neighbor(deConv2l,
unp1shapel,
name='unpool1l')
deConv1l = tf.layers.conv2d(inputs=unPool1l,
filters=3,
kernel_size=[5, 5],
strides=(1, 1),
padding='same',
activation=None,
name='deConv1l')
imClipl = deConv1l #tf.clip_by_value(t = deConv1,clip_value_min = -1.0,clip_value_max = 1.0,name='clipRelu')
print('RconstructeddImage : ', imClipl.name)
recLossl = tf.multiply(
0.01, tf.losses.mean_squared_error(
labels=images,
predictions=imClipl,
))
print('recLoss : ', recLossl.name)
# Count the number of active entries, and compute the total batch loss.
num_active = tf.reduce_sum(tf.cast(tf.greater(losses, 1e-5), tf.float32))
loss_mean = tf.reduce_mean(losses)
# Some logging for tensorboard.
tf.summary.histogram('loss_distribution', losses)
tf.summary.scalar('loss', loss_mean)
tf.summary.scalar('batch_top1', train_top1)
tf.summary.scalar('batch_prec_at_{}'.format(args.batch_k - 1), prec_at_k)
tf.summary.scalar('active_count', num_active)
tf.summary.histogram('embedding_dists', dists)
tf.summary.histogram('embedding_pos_dists', pos_dists)
tf.summary.histogram('embedding_neg_dists', neg_dists)
tf.summary.histogram('embedding_lengths',
tf.norm(endpoints['emb_raw'], axis=1))
# Create the mem-mapped arrays in which we'll log all training detail in
# addition to tensorboard, because tensorboard is annoying for detailed
# inspection and actually discards data in histogram summaries.
if args.detailed_logs:
log_embs = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'embeddings'),
dtype=np.float32,
shape=(args.train_iterations, batch_size, args.embedding_dim))
log_loss = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'losses'),
dtype=np.float32,
shape=(args.train_iterations, batch_size))
log_fids = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'fids'),
dtype='S' + str(max_fid_len),
shape=(args.train_iterations, batch_size))
# These are collected here before we add the optimizer, because depending
# on the optimizer, it might add extra slots, which are also global
# variables, with the exact same prefix.
model_variables = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
body_prefix)
# Define the optimizer and the learning-rate schedule.
# Unfortunately, we get NaNs if we don't handle no-decay separately.
global_step = tf.Variable(0, name='global_step', trainable=False)
if 0 <= args.decay_start_iteration < args.train_iterations:
learning_rate = tf.train.exponential_decay(
args.learning_rate,
tf.maximum(0, global_step - args.decay_start_iteration),
args.train_iterations - args.decay_start_iteration, 0.001)
else:
learning_rate = args.learning_rate
tf.summary.scalar('learning_rate', learning_rate)
optimizer = tf.train.AdamOptimizer(learning_rate)
# Feel free to try others!
# optimizer = tf.train.AdadeltaOptimizer(learning_rate)
# Update_ops are used to update batchnorm stats.
with tf.control_dependencies(tf.get_collection(tf.GraphKeys.UPDATE_OPS)):
train_op = optimizer.minimize(tf.add(
loss_mean,
tf.add(recLoss, tf.add(recLoss1, tf.add(recLoss2, recLossl)))),
global_step=global_step)
# Define a saver for the complete model.
checkpoint_saver = tf.train.Saver(max_to_keep=0)
with tf.Session() as sess:
if args.resume:
# In case we're resuming, simply load the full checkpoint to init.
last_checkpoint = tf.train.latest_checkpoint(args.experiment_root)
log.info('Restoring from checkpoint: {}'.format(last_checkpoint))
checkpoint_saver.restore(sess, last_checkpoint)
else:
# But if we're starting from scratch, we may need to load some
# variables from the pre-trained weights, and random init others.
sess.run(tf.global_variables_initializer())
if args.initial_checkpoint is not None:
saver = tf.train.Saver(model_variables)
saver.restore(sess, args.initial_checkpoint)
# In any case, we also store this initialization as a checkpoint,
# such that we could run exactly reproduceable experiments.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=0)
merged_summary = tf.summary.merge_all()
summary_writer = tf.summary.FileWriter(args.experiment_root,
sess.graph)
start_step = sess.run(global_step)
log.info('Starting training from iteration {}.'.format(start_step))
# Finally, here comes the main-loop. This `Uninterrupt` is a handy
# utility such that an iteration still finishes on Ctrl+C and we can
# stop the training cleanly.
with lb.Uninterrupt(sigs=[SIGINT, SIGTERM], verbose=True) as u:
for i in range(start_step, args.train_iterations):
# Compute gradients, update weights, store logs!
start_time = time.time()
_, summary, step, b_prec_at_k, b_embs, b_loss, b_fids ,b_rec, b_rec1= \
sess.run([train_op, merged_summary, global_step,
prec_at_k, endpoints['emb'], losses, fids,recLoss, recLoss1])
elapsed_time = time.time() - start_time
# Compute the iteration speed and add it to the summary.
# We did observe some weird spikes that we couldn't track down.
summary2 = tf.Summary()
summary2.value.add(tag='secs_per_iter',
simple_value=elapsed_time)
summary_writer.add_summary(summary2, step)
summary_writer.add_summary(summary, step)
if args.detailed_logs:
log_embs[i], log_loss[i], log_fids[
i] = b_embs, b_loss, b_fids
# Do a huge print out of the current progress.
seconds_todo = (args.train_iterations - step) * elapsed_time
log.info(
'iter:{:6d}, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, '
'recLoss: {:.3f} batch-p@{}: {:.2%}, ETA: {} ({:.2f}s/it)'.
format(step, float(np.min(b_loss)), float(np.mean(b_loss)),
float(np.max(b_loss)), b_rec, args.batch_k - 1,
float(b_prec_at_k),
timedelta(seconds=int(seconds_todo)), elapsed_time))
sys.stdout.flush()
sys.stderr.flush()
# Save a checkpoint of training every so often.
if (args.checkpoint_frequency > 0
and step % args.checkpoint_frequency == 0):
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=step)
# Stop the main-loop at the end of the step, if requested.
if u.interrupted:
log.info("Interrupted on request!")
break
# Store one final checkpoint. This might be redundant, but it is crucial
# in case intermediate storing was disabled and it saves a checkpoint
# when the process was interrupted.
checkpoint_saver.save(sess,
os.path.join(args.experiment_root, 'checkpoint'),
global_step=step)
def main():
# my_devices = tf.config.experimental.list_physical_devices(device_type='CPU')
# tf.config.experimental.set_visible_devices(devices= my_devices, device_type='CPU')
# # To find out which devices your operations and tensors are assigned to
# tf.debugging.set_log_device_placement(True)
args = parser.parse_args(args=[])
show_all_parameters(args)
if not args.train_set:
parser.print_help()
print("You didn't specify the 'train_set' argument!")
sys.exit(1)
if not args.image_root:
parser.print_help()
print("You didn't specify the 'image_root' argument!")
sys.exit(1)
pids, fids = common.load_dataset(args.train_set, args.image_root)
unique_pids = np.unique(pids)
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Take the dataset size equal to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
dataset = dataset.take((len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(None) # Repeat indefinitely.
# For every PID, get K images.
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids, all_pids=pids, batch_k=args.batch_k))
# Ungroup/flatten the batches
dataset = dataset.unbatch()
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(lambda fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size))
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid:
(tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.image.random_crop(
im, net_input_size + (3, )), fid, pid))
# Group the data into PK batches.
batch_size = args.batch_p * args.batch_k
dataset = dataset.batch(batch_size)
dataset = dataset.prefetch(1)
dataiter = iter(dataset)
model = Trinet(args.embedding_dim)
lr_schedule = tf.keras.optimizers.schedules.ExponentialDecay(
args.learning_rate, args.train_iterations - args.decay_start_iteration,
0.001)
optimizer = tf.keras.optimizers.Adam(learning_rate=lr_schedule)
writer = tf.summary.create_file_writer(args.experiment_root)
ckpt = tf.train.Checkpoint(step=tf.Variable(0),
optimizer=optimizer,
net=model)
manager = tf.train.CheckpointManager(ckpt,
args.experiment_root,
max_to_keep=10)
if args.resume:
ckpt.restore(manager.latest_checkpoint)
for epoch in range(args.train_iterations):
# for images,fids,pids in dataset:
images, fids, pids = next(dataiter)
with tf.GradientTape() as tape:
emb = model(images)
dists = loss.cdist(emb, emb)
losses, top1, prec, topksame, negdist, posdist = loss.batch_hard(
dists, pids, args.margin, args.batch_k)
lossavg = tf.reduce_mean(losses)
lossnp = losses.numpy()
with writer.as_default():
tf.summary.scalar("loss", lossavg, step=epoch)
tf.summary.scalar('batch_top1', top1, step=epoch)
tf.summary.scalar('batch_prec_at_{}'.format(args.batch_k - 1),
prec,
step=epoch)
tf.summary.histogram('losses', losses, step=epoch)
tf.summary.histogram('embedding_dists', dists, step=epoch)
tf.summary.histogram('embedding_pos_dists', negdist, step=epoch)
tf.summary.histogram('embedding_neg_dists', posdist, step=epoch)
print('iter:{:6d}, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, '
' batch-p@{}: {:.2%}'.format(epoch, float(np.min(lossnp)),
float(np.mean(lossnp)),
float(np.max(lossnp)),
args.batch_k - 1, float(prec)))
grad = tape.gradient(lossavg, model.trainable_variables)
optimizer.apply_gradients(zip(grad, model.trainable_variables))
ckpt.step.assign_add(1)
if epoch % args.checkpoint_frequency == 0:
manager.save()
def main():
# Verify that parameters are set correctly.
args = parser.parse_args()
# Possibly auto-generate the output filename.
if args.filename is None:
basename = os.path.basename(args.dataset)
args.filename = os.path.splitext(basename)[0] + '_embeddings.h5'
# Load the args from the original experiment.
args_file = os.path.join(args.experiment_root, 'args.json')
if os.path.isfile(args_file):
if not args.quiet:
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
# Add arguments from training.
for key, value in args_resumed.items():
args.__dict__.setdefault(key, value)
# won't be used
args.image_root = args.image_root or args_resumed['image_root']
else:
raise IOError(
'`args.json` could not be found in: {}'.format(args_file))
if not args.quiet:
print('Evaluating using the following parameters:')
for key, value in sorted(vars(args).items()):
print('{}: {}'.format(key, value))
# Load the data from the CSV file.
_, data_fids = common.load_dataset(args.dataset, args.image_root)
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
# Setup a tf Dataset containing all images.
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
# Convert filenames to actual image tensors.
dataset = dataset.map(lambda fid: common.fid_to_image(
fid,
tf.constant('dummy'),
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
modifiers = ['original']
# Group it back into PK batches.
dataset = dataset.batch(args.batch_size)
# Overlap producing and consuming.
dataset = dataset.prefetch(1)
images, _, _ = dataset.make_one_shot_iterator().get_next()
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
endpoints, body_prefix = model.endpoints(images, is_training=False)
with tf.name_scope('head'):
endpoints = head.head(endpoints, args.embedding_dim, is_training=False)
with h5py.File(args.filename, 'w') as f_out, tf.Session() as sess:
# Initialize the network/load the checkpoint.
if args.checkpoint is None:
checkpoint = tf.train.latest_checkpoint(args.experiment_root)
else:
checkpoint = os.path.join(args.experiment_root, args.checkpoint)
if not args.quiet:
print('Restoring from checkpoint: {}'.format(checkpoint))
tf.train.Saver().restore(sess, checkpoint)
# Go ahead and embed the whole dataset, with all augmented versions too.
emb_storage = np.zeros(
(len(data_fids) * len(modifiers), args.embedding_dim), np.float32)
for start_idx in count(step=args.batch_size):
try:
emb = sess.run(endpoints['emb'])
print('\rEmbedded batch {}-{}/{}'.format(
start_idx, start_idx + len(emb), len(emb_storage)),
flush=True,
end='')
emb_storage[start_idx:start_idx + len(emb)] = emb
except tf.errors.OutOfRangeError:
break # This just indicates the end of the dataset.
print()
# Store the final embeddings.
emb_dataset = f_out.create_dataset('emb', data=emb_storage)
# Store information about the produced augmentation and in case no crop
# augmentation was used, if the images are resized or avg pooled.
f_out.create_dataset('augmentation_types',
data=np.asarray(modifiers, dtype='|S'))
if args.filename is None:
basename = os.path.basename(args.dataset)
args.filename = os.path.splitext(basename)[0] + '_embeddings.h5'
args.filename = os.path.join(args.experiment_root, args.filename)
_, data_fids = common.load_dataset(args.dataset, args.image_root)
net_input_size = (args.net_input_height, args.net_input_width)
# pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
dataset = dataset.map(
lambda fid: common.fid_to_image(fid,
tf.constant('dummy'),
image_root=args.image_root,
image_size=net_input_size),
num_parallel_calls=args.loading_threads)
dataset = dataset.batch(args.batch_size)
dataset = dataset.prefetch(1)
model = Trinet(args.embedding_dim)
optimizer = tf.keras.optimizers.Adam()
ckpt = tf.train.Checkpoint(step=tf.Variable(0), optimizer=optimizer, net=model)
manager = tf.train.CheckpointManager(ckpt,
args.experiment_root,
max_to_keep=10)
ckpt.restore(manager.latest_checkpoint).expect_partial()
def main():
args = parser.parse_args()
# We store all arguments in a json file. This has two advantages: 我们将所有参数存储在json文件中。 这有两个好处：
# 1. We can always get back and see what exactly that experiment was 1.我们总是可以回头看看实验是什么
# 2. We can resume an experiment as-is without needing to remember all flags.2.我们可以按原样恢复实验，无需记住所有标志。
args_file = os.path.join(args.experiment_root, 'args.json')
if args.resume:
if not os.path.isfile(args_file):
raise IOError('`args.json` not found in {}'.format(args_file))
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
args_resumed['resume'] = True # This would be overwritten.
# When resuming, we not only want to populate the args object with the
# values from the file, but we also want to check for some possible
# conflicts between loaded and given arguments.
#恢复时，我们不仅需要使用文件中的值填充args对象，但我们也想检查加载参数和给定参数之间的一些可能的冲突。
for key, value in args.__dict__.items():
if key in args_resumed:
resumed_value = args_resumed[key]
if resumed_value != value:
print('Warning: For the argument `{}` we are using the'
' loaded value `{}`. The provided value was `{}`'
'.'.format(key, resumed_value, value))
args.__dict__[key] = resumed_value
else:
print('Warning: A new argument was added since the last run:'
' `{}`. Using the new value: `{}`.'.format(key, value))
else:
# If the experiment directory exists already, we bail in fear.如果实验目录已经存在，我们就会担心。
if os.path.exists(args.experiment_root):
if os.listdir(args.experiment_root):
print('The directory {} already exists and is not empty.'
' If you want to resume training, append --resume to'
' your call.'.format(args.experiment_root))
exit(1)
else:
os.makedirs(args.experiment_root)
# Store the passed arguments for later resuming and grepping in a nice
# and readable format.将传递的参数存储起来，以便稍后以一种很好且可读的格式恢复和刷新。
with open(args_file, 'w') as f:
json.dump(vars(args),
f,
ensure_ascii=False,
indent=2,
sort_keys=True)
log_file = os.path.join(args.experiment_root, "train")
logging.config.dictConfig(common.get_logging_dict(log_file))
log = logging.getLogger('train')
# Also show all parameter values at the start, for ease of reading logs.
#同时在开始时显示所有参数值，便于读取日志。
log.info('Training using the following parameters:')
for key, value in sorted(vars(args).items()):
log.info('{}: {}'.format(key, value))
# Check them here, so they are not required when --resume-ing.在这里检查他们，
if not args.train_set:
parser.print_help()
log.error("You did not specify the `train_set` argument!")
sys.exit(1)
if not args.image_root:
parser.print_help()
log.error("You did not specify the required `image_root` argument!")
sys.exit(1)
# Load the data from the CSV file. 加载CSV文件中的数据。
pids, fids = common.load_dataset(args.train_set, args.image_root)
max_fid_len = max(map(
len, fids)) # We'll need this later for logfiles.我们稍后需要这个日志文件。
# Setup a tf.Dataset where one "epoch" loops over all PIDS. 设置一个tf.Dataset，其中一个“epoch”在所有PIDS上循环。
# PIDS are shuffled after every epoch and continue indefinitely.PIDS在每个时代之后都会被洗牌并无限期地继续下去。
unique_pids = np.unique(pids)
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.将数据集大小限制为批量的倍数，以便在每个时期结束时我们不会重叠。
dataset = dataset.take((len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(
None) # Repeat forever. Funny way of stating it. 永远重复。 说明它的有趣方式。
# For every PID, get K images.对于每个PID，获得K个图像。
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids, all_pids=pids, batch_k=args.batch_k))
# Ungroup/flatten the batches for easy loading of the files.取消组合/拼合批次以便轻松加载文件。
dataset = dataset.apply(tf.contrib.data.unbatch())
# Convert filenames to actual image tensors. 将文件名转换为实际图像张量。
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(lambda fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments. 如果由参数指定，则增加数据。
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid:
(tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.random_crop(
im, net_input_size + (3, )), fid, pid))
# Group it back into PK batches. 将其重新分组为PK批次。
batch_size = args.batch_p * args.batch_k
dataset = dataset.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset = dataset.prefetch(1)
# Since we repeat the data infinitely, we only need a one-shot iterator.由于我们无限地重复数据，因此我们只需要一个one-shot 迭代器。
images, fids, pids = dataset.make_one_shot_iterator().get_next()
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
# Feed the image through the model. The returned `body_prefix` will be used
# further down to load the pre-trained weights for all variables with this
# prefix.
#通过模型提供图像。返回的`body_prefix`将进一步用于加载具有此前缀的所有变量的预先训练权重。
endpoints, body_prefix = model.endpoints(images, is_training=True)
with tf.name_scope('head'):
endpoints = head.head(endpoints, args.embedding_dim, is_training=True)
# Create the loss in two steps: 分两步创建损失：
# 1. Compute all pairwise distances according to the specified metric.1.根据指定的度量计算所有成对距离。
# 2. For each anchor along the first dimension, compute its loss. 2.对于第一维中的每个锚，计算其损失。
dists = loss.cdist(endpoints['emb'], endpoints['emb'], metric=args.metric)
losses, train_top1, prec_at_k, _, neg_dists, pos_dists = loss.LOSS_CHOICES[
args.loss](dists,
pids,
args.margin,
batch_precision_at_k=args.batch_k - 1)
# Count the number of active entries, and compute the total batch loss. 计算活动条目的数量，并计算总批量损失。
num_active = tf.reduce_sum(tf.cast(tf.greater(losses, 1e-5), tf.float32))
loss_mean = tf.reduce_mean(losses)
# Some logging for tensorboard. 一些日志记录在tensorboard。
tf.summary.histogram('loss_distribution', losses)
tf.summary.scalar('loss', loss_mean)
tf.summary.scalar('batch_top1', train_top1)
tf.summary.scalar('batch_prec_at_{}'.format(args.batch_k - 1), prec_at_k)
tf.summary.scalar('active_count', num_active)
tf.summary.histogram('embedding_dists', dists)
tf.summary.histogram('embedding_pos_dists', pos_dists)
tf.summary.histogram('embedding_neg_dists', neg_dists)
tf.summary.histogram('embedding_lengths',
tf.norm(endpoints['emb_raw'], axis=1))
# Create the mem-mapped arrays in which we'll log all training detail in
# addition to tensorboard, because tensorboard is annoying for detailed
# inspection and actually discards data in histogram summaries.
#创建mem - mapped数组，我们将记录除tensorboard之外的所有训练细节，因为tensorboard对于详细检查很烦人，实际上在直方图总结中丢弃了数据。
if args.detailed_logs:
log_embs = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'embeddings'),
dtype=np.float32,
shape=(args.train_iterations, batch_size, args.embedding_dim))
log_loss = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'losses'),
dtype=np.float32,
shape=(args.train_iterations, batch_size))
log_fids = lb.create_or_resize_dat(
os.path.join(args.experiment_root, 'fids'),
dtype='S' + str(max_fid_len),
shape=(args.train_iterations, batch_size))
# These are collected here before we add the optimizer, because depending
# on the optimizer, it might add extra slots, which are also global
# variables, with the exact same prefix.
#在我们添加优化器之前收集这些信息，因为根据优化器的不同，它可能会添加额外的插槽，这些插槽也是全局变量，具有完全相同的前缀。
model_variables = tf.get_collection(tf.GraphKeys.GLOBAL_VARIABLES,
body_prefix)
# Define the optimizer and the learning-rate schedule. 定义优化器和学习率计划。
# Unfortunately, we get NaNs if we don't handle no-decay separately. 不幸的是，如果我们不单独处理无衰减，我们会得到NaNs。
global_step = tf.Variable(0, name='global_step', trainable=False)
if 0 <= args.decay_start_iteration < args.train_iterations:
learning_rate = tf.train.exponential_decay(
args.learning_rate,
tf.maximum(0, global_step - args.decay_start_iteration),
args.train_iterations - args.decay_start_iteration, 0.001)
else:
learning_rate = args.learning_rate
tf.summary.scalar('learning_rate', learning_rate)
optimizer = tf.train.AdamOptimizer(learning_rate)
# Feel free to try others! 随意尝试别的的优化器！
# optimizer = tf.train.AdadeltaOptimizer(learning_rate)
# Update_ops are used to update batchnorm stats. Update_ops用于更新batchnorm统计信息。
with tf.control_dependencies(tf.get_collection(tf.GraphKeys.UPDATE_OPS)):
train_op = optimizer.minimize(loss_mean, global_step=global_step)
# Define a saver for the complete model. 为整个模型定义一个保存器。
checkpoint_saver = tf.train.Saver(max_to_keep=0)
with tf.Session() as sess:
if args.resume:
# In case we're resuming, simply load the full checkpoint to init.如果我们正在恢复，只需将完整的检查点加载到init。
last_checkpoint = tf.train.latest_checkpoint(args.experiment_root)
log.info('Restoring from checkpoint: {}'.format(last_checkpoint))
checkpoint_saver.restore(sess, last_checkpoint)
else:
# But if we're starting from scratch, we may need to load some
# variables from the pre-trained weights, and random init others.
#但是如果我们从头开始，我们可能需要从预先训练的权重中加载一些变量，并随机初始化其他的变量。
sess.run(tf.global_variables_initializer())
if args.initial_checkpoint is not None:
saver = tf.train.Saver(model_variables)
saver.restore(sess, args.initial_checkpoint)
# In any case, we also store this initialization as a checkpoint,
# such that we could run exactly reproduceable experiments.
#无论如何，我们也将这个初始化作为检查点存储，以便我们可以运行完全可再生的实验。
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=0)
merged_summary = tf.summary.merge_all()
summary_writer = tf.summary.FileWriter(args.experiment_root,
sess.graph)
start_step = sess.run(global_step)
log.info('Starting training from iteration {}.'.format(start_step))
# Finally, here comes the main-loop. This `Uninterrupt` is a handy
# utility such that an iteration still finishes on Ctrl+C and we can
# stop the training cleanly.
#最后，这里是主循环。这个`Uninterrupt`是一个非常方便的工具，可以在Ctrl + C之后完成迭代才停止，我们可以干净地停止训练。
with lb.Uninterrupt(sigs=[SIGINT, SIGTERM], verbose=True) as u:
for i in range(start_step, args.train_iterations):
# Compute gradients, update weights, store logs!计算梯度，更新权重，存储日志！
start_time = time.time()
_, summary, step, b_prec_at_k, b_embs, b_loss, b_fids = \
sess.run([train_op, merged_summary, global_step,
prec_at_k, endpoints['emb'], losses, fids])
elapsed_time = time.time() - start_time
# Compute the iteration speed and add it to the summary.计算迭代速度并将其添加到摘要中。
# We did observe some weird spikes that we couldn't track down.我们确实观察到一些我们无法追查的奇怪尖峰。
summary2 = tf.Summary()
summary2.value.add(tag='secs_per_iter',
simple_value=elapsed_time)
summary_writer.add_summary(summary2, step)
summary_writer.add_summary(summary, step)
if args.detailed_logs:
log_embs[i], log_loss[i], log_fids[
i] = b_embs, b_loss, b_fids
# Do a huge print out of the current progress. 在当前的进展中做大量的印刷。
seconds_todo = (args.train_iterations - step) * elapsed_time
log.info(
'iter:{:6d}, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, '
'batch-p@{}: {:.2%}, ETA: {} ({:.2f}s/it)'.format(
step, float(np.min(b_loss)), float(np.mean(b_loss)),
float(np.max(b_loss)), args.batch_k - 1,
float(b_prec_at_k),
timedelta(seconds=int(seconds_todo)), elapsed_time))
sys.stdout.flush()
sys.stderr.flush()
# Save a checkpoint of training every so often.每隔一段时间保存一次训练的检查点checkpoint。
if (args.checkpoint_frequency > 0
and step % args.checkpoint_frequency == 0):
checkpoint_saver.save(sess,
os.path.join(args.experiment_root,
'checkpoint'),
global_step=step)
# Stop the main-loop at the end of the step, if requested. 如果需要，在步骤结束时停止主循环。
if u.interrupted:
log.info("Interrupted on request!")
break
# Store one final checkpoint. This might be redundant, but it is crucial
# in case intermediate storing was disabled and it saves a checkpoint
# when the process was interrupted.
#存储一个最终检查点。 这可能是多余的，但是在中间存储被禁用的情况下它是至关重要的，并且在进程被中断时保存检查点。
checkpoint_saver.save(sess,
os.path.join(args.experiment_root, 'checkpoint'),
global_step=step)
print('{}: {}'.format(key, value))
# Load the data from the CSV file.
_, data_fids = common.load_dataset(args.dataset, args.image_root)
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
# Setup a tf Dataset containing all images.
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
# Convert filenames to actual image tensors.
dataset = dataset.map(
lambda fid: common.fid_to_image(fid,
tf.convert_to_tensor('dummy'),
image_root=args.image_root,
image_size=pre_crop_size
if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
# `modifiers` is a list of strings that keeps track of which augmentations
# have been applied, so that a human can understand it later on.
modifiers = ['original']
#if args.flip_augment:
# dataset = dataset.map(flip_augment)
# dataset = dataset.apply(tf.contrib.data.unbatch())
# modifiers = [o + m for m in ['', '_flip'] for o in modifiers]
#if args.crop_augment == 'center':
# dataset = dataset.map(lambda im, fid, pid:
def main(argv):
# Verify that parameters are set correctly.
args = parser.parse_args(argv)
if not os.path.exists(args.dataset):
return
# Possibly auto-generate the output filename.
if args.filename is None:
basename = os.path.basename(args.dataset)
args.filename = os.path.splitext(basename)[0] + '_embeddings.h5'
os_utils.touch_dir(os.path.join(args.experiment_root, args.foldername))
log_file = os.path.join(args.experiment_root, args.foldername, "embed")
logging.config.dictConfig(common.get_logging_dict(log_file))
log = logging.getLogger('embed')
args.filename = os.path.join(args.experiment_root, args.foldername,
args.filename)
var_filepath = os.path.join(args.experiment_root, args.foldername,
args.filename[:-3] + '_var.txt')
# Load the args from the original experiment.
args_file = os.path.join(args.experiment_root, 'args.json')
if os.path.isfile(args_file):
if not args.quiet:
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
# Add arguments from training.
for key, value in args_resumed.items():
args.__dict__.setdefault(key, value)
# A couple special-cases and sanity checks
if (args_resumed['crop_augment']) == (args.crop_augment is None):
print('WARNING: crop augmentation differs between training and '
'evaluation.')
args.image_root = args.image_root or args_resumed['image_root']
else:
raise IOError(
'`args.json` could not be found in: {}'.format(args_file))
# Check a proper aggregator is provided if augmentation is used.
if args.flip_augment or args.crop_augment == 'five':
if args.aggregator is None:
print(
'ERROR: Test time augmentation is performed but no aggregator'
'was specified.')
exit(1)
else:
if args.aggregator is not None:
print('ERROR: No test time augmentation that needs aggregating is '
'performed but an aggregator was specified.')
exit(1)
if not args.quiet:
print('Evaluating using the following parameters:')
for key, value in sorted(vars(args).items()):
print('{}: {}'.format(key, value))
# Load the data from the CSV file.
_, data_fids = common.load_dataset(args.dataset, args.image_root)
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
# Setup a tf Dataset containing all images.
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
# Convert filenames to actual image tensors.
dataset = dataset.map(lambda fid: common.fid_to_image(
fid,
tf.constant('dummy'),
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
# `modifiers` is a list of strings that keeps track of which augmentations
# have been applied, so that a human can understand it later on.
modifiers = ['original']
if args.flip_augment:
dataset = dataset.map(flip_augment)
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [o + m for m in ['', '_flip'] for o in modifiers]
if args.crop_augment == 'center':
dataset = dataset.map(lambda im, fid, pid:
(five_crops(im, net_input_size)[0], fid, pid))
modifiers = [o + '_center' for o in modifiers]
elif args.crop_augment == 'five':
dataset = dataset.map(lambda im, fid, pid:
(tf.stack(five_crops(im, net_input_size)),
tf.stack([fid] * 5), tf.stack([pid] * 5)))
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [
o + m for o in modifiers for m in [
'_center', '_top_left', '_top_right', '_bottom_left',
'_bottom_right'
]
]
elif args.crop_augment == 'avgpool':
modifiers = [o + '_avgpool' for o in modifiers]
else:
modifiers = [o + '_resize' for o in modifiers]
emb_model = EmbeddingModel(args)
# Group it back into PK batches.
dataset = dataset.batch(args.batch_size)
dataset = dataset.map(lambda im, fid, pid:
(emb_model.preprocess_input(im), fid, pid))
# Overlap producing and consuming.
dataset = dataset.prefetch(1)
tf.keras.backend.set_learning_phase(0)
with h5py.File(args.filename, 'w') as f_out:
ckpt = tf.train.Checkpoint(step=tf.Variable(1), net=emb_model)
manager = tf.train.CheckpointManager(ckpt,
osp.join(args.experiment_root,
'tf_ckpts'),
max_to_keep=1)
ckpt.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
print("Restored from {}".format(manager.latest_checkpoint))
else:
print("Initializing from scratch.")
emb_storage = np.zeros(
(len(data_fids) * len(modifiers), args.embedding_dim), np.float32)
# for batch_idx,batch in enumerate(dataset):
dataset_iter = iter(dataset)
for start_idx in count(step=args.batch_size):
try:
images, _, _ = next(dataset_iter)
emb = emb_model(images)
emb_storage[start_idx:start_idx + len(emb)] += emb
print('\rEmbedded batch {}-{}/{}'.format(
start_idx, start_idx + len(emb), len(emb_storage)),
flush=True,
end='')
except StopIteration:
break # This just indicates the end of the dataset.
if not args.quiet:
print("Done with embedding, aggregating augmentations...",
flush=True)
if len(modifiers) > 1:
# Pull out the augmentations into a separate first dimension.
emb_storage = emb_storage.reshape(len(data_fids), len(modifiers),
-1)
emb_storage = emb_storage.transpose((1, 0, 2)) # (Aug,FID,128D)
# Store the embedding of all individual variants too.
emb_dataset = f_out.create_dataset('emb_aug', data=emb_storage)
# Aggregate according to the specified parameter.
emb_storage = AGGREGATORS[args.aggregator](emb_storage)
# Store the final embeddings.
emb_dataset = f_out.create_dataset('emb', data=emb_storage)
# Store information about the produced augmentation and in case no crop
# augmentation was used, if the images are resized or avg pooled.
f_out.create_dataset('augmentation_types',
data=np.asarray(modifiers, dtype='|S'))
def prepare_data(args):
'''
Data preparation for training
:param args: all stored arguments
:return: images: prepared images for training
fid: figure id which means relative paths of images
pid: person id (or car id) of each image
'''
# Load the data from the CSV file.
# pids - person id (array corresponding to the images)
# fids - array of the paths to the images ({str_})
pids, fids = common.load_dataset(args.train_dataset, args.image_root,
False)
max_fid_len = max(map(len, fids)) # We'll need this later for logfiles.
# Setup a tf.Dataset where one "epoch" loops over all PIDS.
# PIDS are shuffled after every epoch and continue indefinitely.
unique_pids = np.unique(pids)
# dataset.output_types = float32, dataset.output_shape = len(unique_pids)
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
dataset = dataset.take((len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(None) # Repeat forever. Funny way of stating it.
# For every PID, get K images.
# default is args.batch_k = 4 (so it takes 4 images per each person)
# dataset has len(unique_pids) tensors
# create each tensor = (tensor_of_k_fids, tensor_of_pid)
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids, all_pids=pids, batch_k=args.batch_k))
# Ungroup/flatten the batches for easy loading of the files.
dataset = dataset.apply(tf.contrib.data.unbatch())
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(lambda fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid:
(tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.random_crop(
im, net_input_size + (3, )), fid, pid))
# Group it back into PK batches.
batch_size = args.batch_p * args.batch_k
dataset = dataset.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset = dataset.prefetch(1)
# Since we repeat the data infinitely, we only need a one-shot iterator.
images, fids, pids = dataset.make_one_shot_iterator().get_next()
return [images, fids, pids, max_fid_len]
def main():
# Verify that parameters are set correctly.
args = parser.parse_args()
# Possibly auto-generate the output filename.
if args.filename is None:
basename = os.path.basename(args.dataset)
args.filename = os.path.splitext(basename)[0] + '_embeddings.h5'
args.filename = os.path.join(args.experiment_root, args.filename)
# Load the args from the original experiment.
args_file = os.path.join(args.experiment_root, 'args.json')
if os.path.isfile(args_file):
if not args.quiet:
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
# Add arguments from training.
for key, value in args_resumed.items():
args.__dict__.setdefault(key, value)
# A couple special-cases and sanity checks
if (args_resumed['crop_augment']) == (args.crop_augment is None):
print('WARNING: crop augmentation differs between training and '
'evaluation.')
args.image_root = args.image_root or args_resumed['image_root']
else:
raise IOError('`args.json` could not be found in: {}'.format(args_file))
# Check a proper aggregator is provided if augmentation is used.
if args.flip_augment or args.crop_augment == 'five':
if args.aggregator is None:
print('ERROR: Test time augmentation is performed but no aggregator'
'was specified.')
exit(1)
else:
if args.aggregator is not None:
print('ERROR: No test time augmentation that needs aggregating is '
'performed but an aggregator was specified.')
exit(1)
if not args.quiet:
print('Evaluating using the following parameters:')
for key, value in sorted(vars(args).items()):
print('{}: {}'.format(key, value))
# Load the data from the CSV file.
_, data_fids = common.load_dataset(args.dataset, args.image_root)
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
data_fid = data_fids[10]
# Setup a tf Dataset containing all images.
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
image = common.fid_to_image(data_fid,'dummy',image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size)
# Convert filenames to actual image tensors.
# dataset = dataset.map(
# lambda fid: common.fid_to_image(
# fid, 'dummy', image_root=args.image_root,
# image_size=pre_crop_size if args.crop_augment else net_input_size),
# num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
# `modifiers` is a list of strings that keeps track of which augmentations
# have been applied, so that a human can understand it later on.
# modifiers = ['original']
# if args.flip_augment:
# dataset = dataset.map(flip_augment)
# dataset = dataset.apply(tf.contrib.data.unbatch())
# modifiers = [o + m for m in ['', '_flip'] for o in modifiers]
#
# if args.crop_augment == 'center':
# dataset = dataset.map(lambda im, fid, pid:
# (five_crops(im, net_input_size)[0], fid, pid))
# modifiers = [o + '_center' for o in modifiers]
# elif args.crop_augment == 'five':
# dataset = dataset.map(lambda im, fid, pid:
# (tf.stack(five_crops(im, net_input_size)), [fid]*5, [pid]*5))
# dataset = dataset.apply(tf.contrib.data.unbatch())
# modifiers = [o + m for o in modifiers for m in [
# '_center', '_top_left', '_top_right', '_bottom_left', '_bottom_right']]
# elif args.crop_augment == 'avgpool':
# modifiers = [o + '_avgpool' for o in modifiers]
# else:
# modifiers = [o + '_resize' for o in modifiers]
# Group it back into PK batches.
# dataset = dataset.batch(args.batch_size)
#
# # Overlap producing and consuming.
# dataset = dataset.prefetch(1)
#
# images, _, _ = dataset.make_one_shot_iterator().get_next()
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
image = tf.reshape(image[0],[1,224,224,3])
endpoints, body_prefix = model.endpoints(image, is_training=False)
with tf.name_scope('head'):
endpoints = head.head(endpoints, args.embedding_dim, is_training=False)
with tf.Session() as sess:
checkpoint = os.path.join(args.experiment_root, args.checkpoint)
tf.train.Saver().restore(sess,checkpoint)
layer_name = ['Conv2d_1_pointwise', 'Conv2d_3_pointwise', 'Conv2d_5_pointwise', 'Conv2d_11_pointwise','Conv2d_13_pointwise']
feature1,feature2,feature3,feature4,feature5 = sess.run([endpoints[layer_name[0]],
endpoints[layer_name[1]],
endpoints[layer_name[2]],
endpoints[layer_name[3]],
endpoints[layer_name[4]],
])
features = [feature1,feature2,feature3,feature4,feature5]
cols = 5
rows = 1
for layer,feature in zip(layer_name,features):
# for feature in features:
h = feature.shape[1]
w = feature.shape[2]
filter_show = cols
img_grid = np.zeros((h*rows,w*cols))
for c in range(filter_show):
f_r = math.ceil((c + 1) / cols)
f_c = (c + 1) if f_r == 1 else (c + 1 - (f_r - 1) * cols)
img_grid[(f_r - 1) * h:f_r * h, (f_c - 1) * w:f_c * w] = feature[0, :, :, c]
plt.figure()
plt.imshow(img_grid,aspect='equal',cmap='viridis')
plt.grid(False)
plt.title(layer, fontsize=16)
plt.show()
def embed_csv_file(self,
image_root,
csv_file,
emb_file,
loading_threads=8,
flip=False,
crop=False,
aggregator='mean'):
data_ids, data_fids, data_fols = common.load_dataset(
csv_file, image_root)
data_ids = data_ids.astype(np.int32)
data_fols = data_fols.astype(np.int32)
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
dataset = dataset.map(lambda fid: common.fid_to_image(
fid,
tf.constant('dummy'),
image_root=image_root,
image_size=self.pre_crop_size
if self.crop_augment else self.net_input_size),
num_parallel_calls=loading_threads)
# Augment the data if specified by the arguments.
# `modifiers` is a list of strings that keeps track of which augmentations
# have been applied, so that a human can understand it later on.
modifiers = ['original']
if flip:
dataset = dataset.map(Embedder.flip_augment)
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [o + m for m in ['', '_flip'] for o in modifiers]
print(flip, crop)
if crop == 'center':
dataset = dataset.map(lambda im, fid, pid: (five_crops(
im, net_input_size)[0], fid, pid))
modifiers = [o + '_center' for o in modifiers]
elif crop == 'five':
dataset = dataset.map(lambda im, fid, pid: (
tf.stack(Embedder.five_crops(im, self.net_input_size)),
tf.stack([fid] * 5), tf.stack([pid] * 5)))
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [
o + m for o in modifiers for m in [
'_center', '_top_left', '_top_right', '_bottom_left',
'_bottom_right'
]
]
elif crop == 'avgpool':
modifiers = [o + '_avgpool' for o in modifiers]
else:
modifiers = [o + '_resize' for o in modifiers]
# Group it back into PK batches.
dataset = dataset.batch(self.batch_size)
# Overlap producing and consuming.
dataset = dataset.prefetch(1)
images, _, _ = dataset.make_one_shot_iterator().get_next()
endpoints, body_prefix = self.model.endpoints(images,
is_training=False)
with tf.name_scope('head'):
endpoints = self.head.head(endpoints,
self.embedding_dim,
is_training=False)
# emb_file = os.path.join(self.exp_root, emb_file)
print("Save h5 file to: ", emb_file)
with h5py.File(emb_file, 'w') as f_out, tf.Session() as sess:
# Initialize the network/load the checkpoint.
checkpoint = tf.train.latest_checkpoint(self.exp_root)
print('Restoring from checkpoint: {}'.format(checkpoint))
tf.train.Saver().restore(sess, checkpoint)
# Go ahead and embed the whole dataset, with all augmented versions too.
emb_storage = np.zeros(
(len(data_fids) * len(modifiers), self.embedding_dim),
np.float32)
for start_idx in count(step=self.batch_size):
try:
emb = sess.run(endpoints['emb'])
print('\rEmbedded batch {}-{}/{}'.format(
start_idx, start_idx + len(emb), len(emb_storage)),
flush=True,
end='')
emb_storage[start_idx:start_idx + len(emb)] = emb
except tf.errors.OutOfRangeError:
break # This just indicates the end of the dataset.
print()
print("Done with embedding, aggregating augmentations...",
flush=True)
print(emb_storage.shape)
if len(modifiers) > 1:
# Pull out the augmentations into a separate first dimension.
emb_storage = emb_storage.reshape(len(data_fids),
len(modifiers), -1)
emb_storage = emb_storage.transpose(
(1, 0, 2)) # (Aug,FID,128D)
# Store the embedding of all individual variants too.
emb_dataset = f_out.create_dataset('emb_aug', data=emb_storage)
# Aggregate according to the specified parameter.
emb_storage = AGGREGATORS[aggregator](emb_storage)
print(emb_storage.shape)
# Store the final embeddings.
f_out.create_dataset('emb', data=emb_storage)
f_out.create_dataset('id', data=data_ids)
f_out.create_dataset('fol_id', data=data_fols)
# Store information about the produced augmentation and in case no crop
# augmentation was used, if the images are resized or avg pooled.
f_out.create_dataset('augmentation_types',
data=np.asarray(modifiers, dtype='|S'))
tf.reset_default_graph()
def main():
# Verify that parameters are set correctly.
args = parser.parse_args()
# Possibly auto-generate the output filename.
if args.filename is None:
basename = os.path.basename(args.dataset)
args.filename = os.path.splitext(basename)[0] + '_embeddings.h5'
args.filename = os.path.join(args.experiment_root, args.filename)
# Load the args from the original experiment.
args_file = os.path.join(args.experiment_root, 'args.json')
if os.path.isfile(args_file):
if not args.quiet:
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
# Add arguments from training.
for key, value in args_resumed.items():
args.__dict__.setdefault(key, value)
# A couple special-cases and sanity checks
if (args_resumed['crop_augment']) == (args.crop_augment is None):
print('WARNING: crop augmentation differs between training and '
'evaluation.')
args.image_root = args.image_root or args_resumed['image_root']
else:
raise IOError(
'`args.json` could not be found in: {}'.format(args_file))
# Check a proper aggregator is provided if augmentation is used.
if args.flip_augment or args.crop_augment == 'five':
if args.aggregator is None:
print(
'ERROR: Test time augmentation is performed but no aggregator'
'was specified.')
exit(1)
else:
if args.aggregator is not None:
print('ERROR: No test time augmentation that needs aggregating is '
'performed but an aggregator was specified.')
exit(1)
if not args.quiet:
print('Evaluating using the following parameters:')
for key, value in sorted(vars(args).items()):
print('{}: {}'.format(key, value))
# Load the data from the txt file.
data_fids = common.load_from_txt(args.dataset, args.image_root)
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
# Setup a tf Dataset containing all images.
dataset = tf.data.Dataset.from_tensor_slices(data_fids)
# Convert filenames to actual image tensors.
dataset = dataset.map(lambda fid: common.fid_to_image(
fid,
'dummy',
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
# `modifiers` is a list of strings that keeps track of which augmentations
# have been applied, so that a human can understand it later on.
modifiers = ['original']
if args.flip_augment:
dataset = dataset.map(flip_augment)
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [o + m for m in ['', '_flip'] for o in modifiers]
if args.crop_augment == 'center':
dataset = dataset.map(lambda im, fid, pid:
(five_crops(im, net_input_size)[0], fid, pid))
modifiers = [o + '_center' for o in modifiers]
elif args.crop_augment == 'five':
dataset = dataset.map(lambda im, fid, pid: (tf.stack(
five_crops(im, net_input_size)), [fid] * 5, [pid] * 5))
dataset = dataset.apply(tf.contrib.data.unbatch())
modifiers = [
o + m for o in modifiers for m in [
'_center', '_top_left', '_top_right', '_bottom_left',
'_bottom_right'
]
]
elif args.crop_augment == 'avgpool':
modifiers = [o + '_avgpool' for o in modifiers]
else:
modifiers = [o + '_resize' for o in modifiers]
# Group it back into PK batches.
dataset = dataset.batch(args.batch_size)
# Overlap producing and consuming.
dataset = dataset.prefetch(1)
images, _, _ = dataset.make_one_shot_iterator().get_next()
# Create the model and an embedding head.
model = import_module('nets.' + args.model_name)
head = import_module('heads.' + args.head_name)
endpoints, body_prefix = model.endpoints(images, is_training=False)
with tf.name_scope('head'):
endpoints = head.head(endpoints, args.embedding_dim, is_training=False)
with h5py.File(args.filename,
'w') as f_out, tf.Session(config=config) as sess:
# Initialize the network/load the checkpoint.
if args.checkpoint is None:
checkpoint = tf.train.latest_checkpoint(args.experiment_root)
else:
checkpoint = os.path.join(args.experiment_root, args.checkpoint)
if not args.quiet:
print('Restoring from checkpoint: {}'.format(checkpoint))
tf.train.Saver().restore(sess, checkpoint)
# Go ahead and embed the whole dataset, with all augmented versions too.
emb_storage = np.zeros(
(len(data_fids) * len(modifiers), args.embedding_dim), np.float32)
for start_idx in count(step=args.batch_size):
try:
emb = sess.run(endpoints['emb'])
print('\rEmbedded batch {}-{}/{}'.format(
start_idx, start_idx + len(emb), len(emb_storage)),
flush=True,
end='')
emb_storage[start_idx:start_idx + len(emb)] = emb
except tf.errors.OutOfRangeError:
break # This just indicates the end of the dataset.
print()
if not args.quiet:
print("Done with embedding, aggregating augmentations...",
flush=True)
if len(modifiers) > 1:
# Pull out the augmentations into a separate first dimension.
emb_storage = emb_storage.reshape(len(data_fids), len(modifiers),
-1)
emb_storage = emb_storage.transpose((1, 0, 2)) # (Aug,FID,128D)
# Store the embedding of all individual variants too.
emb_dataset = f_out.create_dataset('emb_aug', data=emb_storage)
# Aggregate according to the specified parameter.
emb_storage = AGGREGATORS[args.aggregator](emb_storage)
# Store the final embeddings.
emb_dataset = f_out.create_dataset('emb', data=emb_storage)
# Store information about the produced augmentation and in case no crop
# augmentation was used, if the images are resized or avg pooled.
f_out.create_dataset('augmentation_types',
data=np.asarray(modifiers, dtype='|S'))
def main(argv):
args = parser.parse_args(argv)
if args.gpu:
os.environ['CUDA_VISIBLE_DEVICES'] = args.gpu
# tf.compat.v1.disable_eager_execution()
# physical_devices = tf.config.experimental.list_physical_devices('GPU')
# tf.config.experimental.set_memory_growth(physical_devices[0], True)
# We store all arguments in a json file. This has two advantages:
# 1. We can always get back and see what exactly that experiment was
# 2. We can resume an experiment as-is without needing to remember all flags.
args_file = os.path.join(args.experiment_root, 'args.json')
if args.resume:
if not os.path.isfile(args_file):
raise IOError('`args.json` not found in {}'.format(args_file))
print('Loading args from {}.'.format(args_file))
with open(args_file, 'r') as f:
args_resumed = json.load(f)
args_resumed['resume'] = True # This would be overwritten.
# When resuming, we not only want to populate the args object with the
# values from the file, but we also want to check for some possible
# conflicts between loaded and given arguments.
for key, value in args.__dict__.items():
if key in args_resumed:
resumed_value = args_resumed[key]
if resumed_value != value:
print('Warning: For the argument `{}` we are using the'
' loaded value `{}`. The provided value was `{}`'
'.'.format(key, resumed_value, value))
args.__dict__[key] = resumed_value
else:
print('Warning: A new argument was added since the last run:'
' `{}`. Using the new value: `{}`.'.format(key, value))
else:
# If the experiment directory exists already, we bail in fear.
if os.path.exists(args.experiment_root):
if os.listdir(args.experiment_root):
print('The directory {} already exists and is not empty.'
' If you want to resume training, append --resume to'
' your call.'.format(args.experiment_root))
exit(1)
else:
os.makedirs(args.experiment_root)
# Store the passed arguments for later resuming and grepping in a nice
# and readable format.
with open(args_file, 'w') as f:
json.dump(vars(args),
f,
ensure_ascii=False,
indent=2,
sort_keys=True)
log_file = os.path.join(args.experiment_root, "train")
logging.config.dictConfig(common.get_logging_dict(log_file))
log = logging.getLogger('train')
# Also show all parameter values at the start, for ease of reading logs.
log.info('Training using the following parameters:')
for key, value in sorted(vars(args).items()):
log.info('{}: {}'.format(key, value))
# Check them here, so they are not required when --resume-ing.
if not args.train_set:
parser.print_help()
log.error("You did not specify the `train_set` argument!")
sys.exit(1)
if not args.image_root:
parser.print_help()
log.error("You did not specify the required `image_root` argument!")
sys.exit(1)
# Load the data from the CSV file.
pids, fids = common.load_dataset(args.train_set, args.image_root)
max_fid_len = max(map(len, fids)) # We'll need this later for logfiles.
# Setup a tf.Dataset where one "epoch" loops over all PIDS.
# PIDS are shuffled after every epoch and continue indefinitely.
unique_pids = np.unique(pids)
if len(unique_pids) < args.batch_p:
unique_pids = np.tile(unique_pids,
int(np.ceil(args.batch_p / len(unique_pids))))
dataset = tf.data.Dataset.from_tensor_slices(unique_pids)
dataset = dataset.shuffle(len(unique_pids))
# Constrain the dataset size to a multiple of the batch-size, so that
# we don't get overlap at the end of each epoch.
dataset = dataset.take((len(unique_pids) // args.batch_p) * args.batch_p)
dataset = dataset.repeat(None) # Repeat forever. Funny way of stating it.
# For every PID, get K images.
dataset = dataset.map(lambda pid: sample_k_fids_for_pid(
pid, all_fids=fids, all_pids=pids, batch_k=args.batch_k))
# Ungroup/flatten the batches for easy loading of the files.
dataset = dataset.unbatch()
# Convert filenames to actual image tensors.
net_input_size = (args.net_input_height, args.net_input_width)
pre_crop_size = (args.pre_crop_height, args.pre_crop_width)
dataset = dataset.map(lambda fid, pid: common.fid_to_image(
fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size if args.crop_augment else net_input_size),
num_parallel_calls=args.loading_threads)
# Augment the data if specified by the arguments.
dataset = dataset.map(
lambda im, fid, pid: common.fid_to_image(fid,
pid,
image_root=args.image_root,
image_size=pre_crop_size
if args.crop_augment else
net_input_size), # Ergys
num_parallel_calls=args.loading_threads)
if args.flip_augment:
dataset = dataset.map(lambda im, fid, pid:
(tf.image.random_flip_left_right(im), fid, pid))
if args.crop_augment:
dataset = dataset.map(lambda im, fid, pid: (tf.image.random_crop(
im, net_input_size + (3, )), fid, pid))
# Create the model and an embedding head.
tf.keras.backend.set_learning_phase(1)
emb_model = EmbeddingModel(args)
# Group it back into PK batches.
batch_size = args.batch_p * args.batch_k
dataset = dataset.map(lambda im, fid, pid:
(emb_model.preprocess_input(im), fid, pid))
dataset = dataset.batch(batch_size)
# Overlap producing and consuming for parallelism.
dataset = dataset.prefetch(1)
# Since we repeat the data infinitely, we only need a one-shot iterator.
# Feed the image through the model. The returned `body_prefix` will be used
# further down to load the pre-trained weights for all variables with this
# prefix.
# all_trainable_variables = embedding_head.trainable_variables+base_model.trainable_variables
# Define the optimizer and the learning-rate schedule.
# Unfortunately, we get NaNs if we don't handle no-decay separately.
if 0 <= args.decay_start_iteration < args.train_iterations:
learning_rate = tf.optimizers.schedules.PolynomialDecay(
args.learning_rate, args.train_iterations, end_learning_rate=1e-7)
else:
learning_rate = args.learning_rate
if args.optimizer == 'adam':
optimizer = tf.keras.optimizers.Adam(learning_rate)
elif args.optimizer == 'momentum':
optimizer = tf.keras.optimizers.SGD(learning_rate, momentum=0.9)
else:
raise NotImplementedError('Invalid optimizer {}'.format(
args.optimizer))
@tf.function
def train_step(images, pids):
with tf.GradientTape() as tape:
batch_embedding = emb_model(images)
if args.loss == 'semi_hard_triplet':
embedding_loss = triplet_semihard_loss(batch_embedding, pids,
args.margin)
elif args.loss == 'hard_triplet':
embedding_loss = batch_hard(batch_embedding, pids, args.margin,
args.metric)
elif args.loss == 'lifted_loss':
embedding_loss = lifted_loss(pids,
batch_embedding,
margin=args.margin)
elif args.loss == 'contrastive_loss':
assert batch_size % 2 == 0
assert args.batch_k == 4 ## Can work with other number but will need tuning
contrastive_idx = np.tile([0, 1, 4, 3, 2, 5, 6, 7],
args.batch_p // 2)
for i in range(args.batch_p // 2):
contrastive_idx[i * 8:i * 8 + 8] += i * 8
contrastive_idx = np.expand_dims(contrastive_idx, 1)
batch_embedding_ordered = tf.gather_nd(batch_embedding,
contrastive_idx)
pids_ordered = tf.gather_nd(pids, contrastive_idx)
# batch_embedding_ordered = tf.Print(batch_embedding_ordered,[pids_ordered],'pids_ordered :: ',summarize=1000)
embeddings_anchor, embeddings_positive = tf.unstack(
tf.reshape(batch_embedding_ordered,
[-1, 2, args.embedding_dim]), 2, 1)
# embeddings_anchor = tf.Print(embeddings_anchor,[pids_ordered,embeddings_anchor,embeddings_positive,batch_embedding,batch_embedding_ordered],"Tensors ", summarize=1000)
fixed_labels = np.tile([1, 0, 0, 1], args.batch_p // 2)
# fixed_labels = np.reshape(fixed_labels,(len(fixed_labels),1))
# print(fixed_labels)
labels = tf.constant(fixed_labels)
# labels = tf.Print(labels,[labels],'labels ',summarize=1000)
embedding_loss = contrastive_loss(labels,
embeddings_anchor,
embeddings_positive,
margin=args.margin)
elif args.loss == 'angular_loss':
embeddings_anchor, embeddings_positive = tf.unstack(
tf.reshape(batch_embedding, [-1, 2, args.embedding_dim]),
2, 1)
# pids = tf.Print(pids, [pids], 'pids:: ', summarize=100)
pids, _ = tf.unstack(tf.reshape(pids, [-1, 2, 1]), 2, 1)
# pids = tf.Print(pids,[pids],'pids:: ',summarize=100)
embedding_loss = angular_loss(pids,
embeddings_anchor,
embeddings_positive,
batch_size=args.batch_p,
with_l2reg=True)
elif args.loss == 'npairs_loss':
assert args.batch_k == 2 ## Single positive pair per class
embeddings_anchor, embeddings_positive = tf.unstack(
tf.reshape(batch_embedding, [-1, 2, args.embedding_dim]),
2, 1)
pids, _ = tf.unstack(tf.reshape(pids, [-1, 2, 1]), 2, 1)
pids = tf.reshape(pids, [-1])
embedding_loss = npairs_loss(pids, embeddings_anchor,
embeddings_positive)
else:
raise NotImplementedError('Invalid Loss {}'.format(args.loss))
loss_mean = tf.reduce_mean(embedding_loss)
gradients = tape.gradient(loss_mean, emb_model.trainable_variables)
optimizer.apply_gradients(zip(gradients,
emb_model.trainable_variables))
return embedding_loss
# sess = tf.compat.v1.Session()
# start_step = sess.run(global_step)
# checkpoint_saver = tf.train.Saver(max_to_keep=2)
start_step = 0
log.info('Starting training from iteration {}.'.format(start_step))
dataset_iter = iter(dataset)
ckpt = tf.train.Checkpoint(step=tf.Variable(1),
optimizer=optimizer,
net=emb_model)
manager = tf.train.CheckpointManager(ckpt,
osp.join(args.experiment_root,
'tf_ckpts'),
max_to_keep=3)
ckpt.restore(manager.latest_checkpoint)
if manager.latest_checkpoint:
print("Restored from {}".format(manager.latest_checkpoint))
else:
print("Initializing from scratch.")
with lb.Uninterrupt(sigs=[SIGINT, SIGTERM], verbose=True) as u:
for i in range(ckpt.step.numpy(), args.train_iterations):
# for batch_idx, batch in enumerate():
start_time = time.time()
images, fids, pids = next(dataset_iter)
batch_loss = train_step(images, pids)
elapsed_time = time.time() - start_time
seconds_todo = (args.train_iterations - i) * elapsed_time
# print(tf.reduce_min(batch_loss).numpy(),tf.reduce_mean(batch_loss).numpy(),tf.reduce_max(batch_loss).numpy())
log.info(
'iter:{:6d}, loss min|avg|max: {:.3f}|{:.3f}|{:6.3f}, ETA: {} ({:.2f}s/it)'
.format(
i,
tf.reduce_min(batch_loss).numpy(),
tf.reduce_mean(batch_loss).numpy(),
tf.reduce_max(batch_loss).numpy(),
# args.batch_k - 1, float(b_prec_at_k),
timedelta(seconds=int(seconds_todo)),
elapsed_time))
ckpt.step.assign_add(1)
if (args.checkpoint_frequency > 0
and i % args.checkpoint_frequency == 0):
# uncomment if you want to save the model weight separately
# emb_model.save_weights(os.path.join(args.experiment_root, 'model_weights_{0:04d}.w'.format(i)))
manager.save()
# Stop the main-loop at the end of the step, if requested.
if u.interrupted:
log.info("Interrupted on request!")
break
