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multigpu_train.py
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multigpu_train.py
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import time
import numpy as np
import tensorflow as tf
from tensorflow.contrib import slim
from keras.utils.data_utils import OrderedEnqueuer
from keras.engine.training_utils import iter_sequence_infinite
tf.app.flags.DEFINE_integer('input_size', 512, '')
tf.app.flags.DEFINE_integer('batch_size', 20, '')
tf.app.flags.DEFINE_integer('workers',5, '')
tf.app.flags.DEFINE_integer('max_queue_size', 40, '')
tf.app.flags.DEFINE_float('learning_rate', 0.0001, '')
tf.app.flags.DEFINE_integer('epochs', 1000, '')
tf.app.flags.DEFINE_float('moving_average_decay', 0.997, '')
tf.app.flags.DEFINE_string('gpu_list', '0,1', '')
tf.app.flags.DEFINE_string('checkpoint_path', 'model/east_font_resnet_v1_50_rbox/', '')
tf.app.flags.DEFINE_boolean('restore', True, 'whether to resotre from checkpoint')
tf.app.flags.DEFINE_boolean('use_multiprocessing', True, '')
tf.app.flags.DEFINE_integer('save_checkpoint_steps', 1000, '')
tf.app.flags.DEFINE_integer('save_summary_steps', 100, '')
tf.app.flags.DEFINE_string('pretrained_model_path', None, '')
tf.app.flags.DEFINE_string('images_dir', 'data/images_dir', '')
tf.app.flags.DEFINE_string('txt_dir', 'data/txt_dir', '')
import model
import icdar
FLAGS = tf.app.flags.FLAGS
gpus = list(range(len(FLAGS.gpu_list.split(','))))
def tower_loss(images, score_maps, geo_maps, training_masks, reuse_variables=None):
# Build inference graph
with tf.variable_scope(tf.get_variable_scope(), reuse=reuse_variables):
f_score, f_geometry = model.model(images, is_training=True)
model_loss = model.loss(score_maps, f_score,
geo_maps, f_geometry,
training_masks)
total_loss = tf.add_n([model_loss] + tf.get_collection(tf.GraphKeys.REGULARIZATION_LOSSES))
# add summary
if reuse_variables is None:
tf.summary.image('input', images)
tf.summary.image('score_map', score_maps)
tf.summary.image('score_map_pred', f_score * 255)
tf.summary.image('geo_map_0', geo_maps[:, :, :, 0:1])
tf.summary.image('geo_map_0_pred', f_geometry[:, :, :, 0:1])
tf.summary.image('training_masks', training_masks)
tf.summary.scalar('model_loss', model_loss)
tf.summary.scalar('total_loss', total_loss)
return total_loss, model_loss
def average_gradients(tower_grads):
'''
average gradients from different towers(gpus)
'''
average_grads = []
for grad_and_vars in zip(*tower_grads):
grads = []
for g, _ in grad_and_vars:
expanded_g = tf.expand_dims(g, 0)
grads.append(expanded_g)
grad = tf.concat(grads, 0)
grad = tf.reduce_mean(grad, 0)
v = grad_and_vars[0][1]
grad_and_var = (grad, v)
average_grads.append(grad_and_var)
return average_grads
def main(argv=None):
import os
os.environ['CUDA_VISIBLE_DEVICES'] = FLAGS.gpu_list
print('gpu id',FLAGS.gpu_list)
if not tf.gfile.Exists(FLAGS.checkpoint_path):
tf.gfile.MkDir(FLAGS.checkpoint_path)
else:
if not FLAGS.restore:
tf.gfile.DeleteRecursively(FLAGS.checkpoint_path)
tf.gfile.MkDir(FLAGS.checkpoint_path)
input_images = tf.placeholder(tf.float32, shape=[None, None, None, 3], name='input_images')
input_score_maps = tf.placeholder(tf.float32, shape=[None, None, None, 1], name='input_score_maps')
if FLAGS.geometry == 'RBOX':
input_geo_maps = tf.placeholder(tf.float32, shape=[None, None, None, 5], name='input_geo_maps')
else:
input_geo_maps = tf.placeholder(tf.float32, shape=[None, None, None, 8], name='input_geo_maps')
input_training_masks = tf.placeholder(tf.float32, shape=[None, None, None, 1], name='input_training_masks')
global_step = tf.get_variable('global_step', [], initializer=tf.constant_initializer(0), trainable=False)
learning_rate = tf.train.exponential_decay(FLAGS.learning_rate, global_step, decay_steps=10000, decay_rate=0.94, staircase=True)
# add summary
tf.summary.scalar('learning_rate', learning_rate)
opt = tf.train.AdamOptimizer(learning_rate)
# opt = tf.train.MomentumOptimizer(learning_rate, 0.9)
# split
input_images_split = tf.split(input_images, len(gpus))
input_score_maps_split = tf.split(input_score_maps, len(gpus))
input_geo_maps_split = tf.split(input_geo_maps, len(gpus))
input_training_masks_split = tf.split(input_training_masks, len(gpus))
tower_grads = []
reuse_variables = None
for i, gpu_id in enumerate(gpus):
with tf.device('/gpu:%d' % gpu_id):
with tf.name_scope('model_%d' % gpu_id) as scope:
iis = input_images_split[i]
isms = input_score_maps_split[i]
igms = input_geo_maps_split[i]
itms = input_training_masks_split[i]
total_loss, model_loss = tower_loss(iis, isms, igms, itms, reuse_variables)
batch_norm_updates_op = tf.group(*tf.get_collection(tf.GraphKeys.UPDATE_OPS, scope))
reuse_variables = True
grads = opt.compute_gradients(total_loss)
tower_grads.append(grads)
grads = average_gradients(tower_grads)
apply_gradient_op = opt.apply_gradients(grads, global_step=global_step)
summary_op = tf.summary.merge_all()
# save moving average
variable_averages = tf.train.ExponentialMovingAverage(
FLAGS.moving_average_decay, global_step)
variables_averages_op = variable_averages.apply(tf.trainable_variables())
# batch norm updates
with tf.control_dependencies([variables_averages_op, apply_gradient_op, batch_norm_updates_op]):
train_op = tf.no_op(name='train_op')
saver = tf.train.Saver(tf.global_variables())
summary_writer = tf.summary.FileWriter(FLAGS.checkpoint_path, tf.get_default_graph())
init = tf.global_variables_initializer()
if FLAGS.pretrained_model_path is not None:
variable_restore_op = slim.assign_from_checkpoint_fn(FLAGS.pretrained_model_path, slim.get_trainable_variables(),
ignore_missing_vars=True)
with tf.Session(config=tf.ConfigProto(allow_soft_placement=True)) as sess:
if FLAGS.restore:
print('continue training from previous checkpoint')
ckpt = tf.train.latest_checkpoint(FLAGS.checkpoint_path)
saver.restore(sess, ckpt)
else:
sess.run(init)
if FLAGS.pretrained_model_path is not None:
variable_restore_op(sess)
print('FLAGS.train_txt_dir',FLAGS.train_txt_dir)
generator = icdar.EAST_generator(data_path=FLAGS.images_dir,
txt_dir=FLAGS.txt_dir,
batch_size=FLAGS.batch_size,)
if FLAGS.workers > 0:
''' load data with multiprocessing
'''
enqueuer = OrderedEnqueuer(
generator,
use_multiprocessing=FLAGS.use_multiprocessing,
shuffle=True)
enqueuer.start(workers=FLAGS.workers, max_queue_size=FLAGS.max_queue_size)
output_generator = enqueuer.get()
print('workers ',FLAGS.workers)
else:
output_generator = iter_sequence_infinite(generator)
start = time.time()
step_print =FLAGS.save_checkpoint_steps//10
for epoch in range(FLAGS.epochs):
for step in range(len(generator)):
data = next(output_generator)
temp_data=data
## prevent for the batch_size%len(gpus)!=0
if len(data[0])%len(gpus)!=0:
temp_data = []
for item in data:
temp_data.append(item[:len(data[0])//len(gpus)*len(gpus)])
data = temp_data
ml, tl, _ = sess.run([model_loss, total_loss, train_op], feed_dict={input_images: data[0],
input_score_maps: data[1],
input_geo_maps: data[2],
input_training_masks: data[3]})
if np.isnan(tl):
print('Loss diverged, stop training')
break
if step % step_print == 0:
avg_time_per_step = (time.time() - start)/step_print
avg_examples_per_second = (step_print * FLAGS.batch_size)/(time.time() - start)
start = time.time()
print('Step {:06d}, model loss {:.4f}, total loss {:.4f}, {:.2f} seconds/step, {:.2f} examples/second'.format(
step, ml, tl, avg_time_per_step, avg_examples_per_second))
if step % FLAGS.save_checkpoint_steps == 0:
saver.save(sess, FLAGS.checkpoint_path + 'model.ckpt', global_step=global_step)
if step % FLAGS.save_summary_steps == 0:
_, tl, summary_str = sess.run([train_op, total_loss, summary_op],
feed_dict={input_images: data[0], input_score_maps: data[1],
input_geo_maps: data[2],
input_training_masks: data[3]})
summary_writer.add_summary(summary_str, global_step=step)
generator.on_epoch_end()
if __name__ == '__main__':
tf.app.run()