#tf.train.exponential_decay(learning_rate, global_steps, decay_steps, decay_rate, staircase=True/False)：
#指數(shù)衰減學(xué)習(xí)率
#learning_rate-學(xué)習(xí)率
#global_steps-訓(xùn)練輪數(shù)
#decay_steps-完整的使用一遍訓(xùn)練數(shù)據(jù)所需的迭代輪數(shù)；=總訓(xùn)練樣本數(shù)/batch
#decay_rate-衰減速度
#staircase-衰減方式；=True，那就表明每decay_steps次計(jì)算學(xué)習(xí)速率變化，更新原始學(xué)習(xí)速率；=alse，那就是每一步都更新學(xué)習(xí)速率。learning_rate = tf.train.exponential_decay(
initial_learning_rate = 0.001
global_step = tf.Variable(0, trainable=False)
decay_steps = 100
decay_rate = 0.95
total_loss = slim.losses.get_total_loss()
learning_rate = tf.train.exponential_decay(initial_learning_rate, global_step, decay_steps, decay_rate, True, name='learning_rate')
optimizer = tf.train.GradientDescentOptimizer(learning_rate).minimize(total_loss, global_step)

initial_learning_rate = 0.001
global_step = tf.Variable(0, trainable=False)
decay_steps = 100
decay_rate = 0.95
total_loss = slim.losses.get_total_loss()
learning_rate = tf.train.exponential_decay(initial_learning_rate, global_step, decay_steps, decay_rate, True, name='learning_rate')
optimizer = tf.train.GradientDescentOptimizer(learning_rate).minimize(total_loss, global_step)
ema = tf.train.ExponentialMovingAverage(decay=0.9999)
#tf.trainable_variables--返回的是需要訓(xùn)練的變量列表
averages_op = ema.apply(tf.trainable_variables())
with tf.control_dependencies([optimizer]):
   train_op = tf.group(averages_op)