def build_optimizer(learning_rate, loss, l2_loss, update_vars, global_step):
"""
生成优化器
:return:
"""
optimizer = config_optimizer(train_args.optimizer_name, learning_rate)
# BN操作
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
with tf.control_dependencies(update_ops):
# 梯度下降
gvs = optimizer.compute_gradients(
loss[0] + l2_loss, var_list=update_vars) # 只优化update_vars中参数
# 应用gradient clip, 防止梯度爆炸
clip_grad_var = [
gv if gv[0] is None else [tf.clip_by_norm(gv[0], 100.), gv[1]]
for gv in gvs
]
train_op = optimizer.apply_gradients(clip_grad_var,
global_step=global_step)
return train_op
tf.less(
global_step, train_batch_num *
config_common.model_set["warm_up_epoch"]),
lambda: config_common.model_set["warm_up_lr"],
lambda: config_learning_rate(
config_common, global_step - train_batch_num *
config_common.model_set["warm_up_epoch"
], lr_decay_freq))
else:
learning_rate = config_learning_rate(config_common,
global_step,
lr_decay_freq)
tf.summary.scalar('learning_rate', learning_rate)
optimizer = config_optimizer(
config_common.model_set["optimizer_name"], learning_rate)
#add my clip
optimizer = tf.contrib.estimator.clip_gradients_by_norm(
optimizer, 3.0)
with tf.device(gpu_device[0]):
tower_grads = []
with tf.variable_scope(tf.get_variable_scope()):
for gpu_id in range(len(gpu_device)):
with tf.device(gpu_device[gpu_id]):
with tf.name_scope('%s_%d' %
('tower', gpu_id)) as scope:
# get an element from the choosed dataset iterator
image, y_true_13, y_true_26, y_true_52, img_path = dataset_iterator.get_next(
)
# 目标中心位于那个anchor,那个anchor就负责检测这个物体,他的x,y,w,h就是真是目标的数据,其余的anchor为0
y_true = [y_true_13, y_true_26, y_true_52]
global_step = tf.Variable(0,
trainable=False,
collections=[tf.GraphKeys.LOCAL_VARIABLES])
if args.use_warm_up:
learning_rate = tf.cond(
tf.less(global_step, args.train_batch_num * args.warm_up_epoch),
lambda: args.warm_up_lr, lambda: config_learning_rate(
args, global_step - args.train_batch_num * args.warm_up_epoch))
else:
learning_rate = config_learning_rate(args, global_step)
tf.summary.scalar('learning_rate', learning_rate)
if not args.save_optimizer:
saver_to_save = tf.train.Saver()
optimizer = config_optimizer(args.optimizer_name, learning_rate)
if args.save_optimizer:
saver_to_save = tf.train.Saver()
# set dependencies for BN ops
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
with tf.control_dependencies(update_ops):
train_op = optimizer.minimize(loss[0],
var_list=update_vars,
global_step=global_step)
with tf.Session() as sess:
sess.run([
tf.global_variables_initializer(),
tf.local_variables_initializer(), train_iterator.initializer
args.train_batch_num * args.warm_up_epoch),
lambda: args.learning_rate_init * global_step_finetune /
(args.train_batch_num * args.warm_up_epoch),
lambda: config_learning_rate(
args, global_step_finetune - args.train_batch_num * args.
warm_up_epoch))
else:
learning_rate_finetune = config_learning_rate(args,
global_step_finetune)
tf.summary.scalar('learning_rate', learning_rate_finetune)
if not args.save_optimizer:
saver_best_finetune = tf.train.Saver()
print("[INFO] save_best_finetune construct _not ")
optimizer_finetune = config_optimizer(args.optimizer_name,
learning_rate_finetune)
update_vars_finetune = tf.contrib.framework.get_variables_to_restore(
include=prune_model._update_part)
if args.save_optimizer:
saver_best_finetune = tf.train.Saver()
print("[INFO] save_best_finetune construct _true")
# set dependencies for BN ops
update_ops_finetune = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
with tf.control_dependencies(update_ops_finetune):
train_op_finetune = optimizer_finetune.minimize(
loss_fintune[0] + l2_loss_fintune,
var_list=update_vars_finetune,
global_step=global_step_finetune)
#################################### begining finetune ###########################################
global_step = tf.Variable(0,
trainable=False,
collections=[tf.GraphKeys.LOCAL_VARIABLES])
if flag.use_warm_up:
learning_rate = tf.cond(
tf.less(global_step, flag.train_batch_num * flag.warm_up_epoch),
lambda: flag.warm_up_lr, lambda: config_learning_rate(
flag, global_step - flag.train_batch_num * flag.warm_up_epoch))
else:
learning_rate = config_learning_rate(flag, global_step)
tf.summary.scalar('learning_rate', learning_rate)
if not flag.save_optimizer:
saver_to_save = tf.train.Saver()
optimizer = config_optimizer(flag.optimizer_name, learning_rate)
if flag.save_optimizer:
saver_to_save = tf.train.Saver()
# set dependencies for BN ops
update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS)
with tf.control_dependencies(update_ops):
train_op = optimizer.minimize(loss[0],
var_list=update_vars,
global_step=global_step)
with tf.Session(config=tf.ConfigProto(gpu_options=gpu_options)) as sess:
sess.run([
tf.global_variables_initializer(),
tf.local_variables_initializer(), train_iterator.initializer
