def evaluate(self, sess):
global_step = sess.run(tf.train.get_or_create_global_step())
test_results = self.run_epoch_generator(
sess,
self.model,
self._data['eval_loader'].get_iterator(),
return_output=True,
training=False)
# y_preds: a list of (batch_size, horizon, num_nodes, output_dim)
test_loss, y_preds = test_results['loss'], test_results['outputs']
utils.add_simple_summary(self._writer, ['loss/test_loss'], [test_loss],
global_step=global_step)
y_preds = np.concatenate(y_preds, axis=0)
scaler = self._data['scaler']
predictions = []
y_truths = []
for horizon_i in range(self._data['y_eval'].shape[1]):
y_truth = scaler.inverse_transform(
self._data['y_eval'][:, horizon_i, :, 0])
y_truths.append(y_truth)
y_pred = scaler.inverse_transform(y_preds[:, horizon_i, :, 0])
predictions.append(y_pred)
mse = metrics.masked_mse_np(preds=y_pred,
labels=y_truth,
null_val=0)
mae = metrics.masked_mae_np(preds=y_pred,
labels=y_truth,
null_val=0)
mape = metrics.masked_mape_np(preds=y_pred,
labels=y_truth,
null_val=0)
rmse = metrics.masked_rmse_np(preds=y_pred,
labels=y_truth,
null_val=0)
self._logger.info(
"Horizon {:02d}, MSE: {:.2f}, MAE: {:.2f}, RMSE: {:.2f}, MAPE: {:.4f}"
.format(horizon_i + 1, mse, mae, rmse, mape))
utils.add_simple_summary(self._writer, [
'%s_%d' % (item, horizon_i + 1)
for item in ['metric/rmse', 'metric/mae', 'metric/mse']
], [rmse, mae, mse],
global_step=global_step)
outputs = {'predictions': predictions, 'groundtruth': y_truths}
return outputs
def evaluate(self, sess, **kwargs):
global_step = sess.run(tf.train.get_or_create_global_step())
test_results = self.run_epoch_generator(
sess,
'test',
self._test_model,
self._data['test_loader'].get_iterator(),
self._data['scaler'],
return_output=True,
training=False)
# y_preds: a list of (batch_size, horizon, num_nodes, output_dim)
test_loss, y_preds = test_results['loss'], test_results['outputs']
self._logger.info('test_mae: %f', (np.asscalar(test_loss)))
utils.add_simple_summary(self._writer, ['loss/test_loss'], [test_loss],
global_step=global_step)
return
def evaluate(self, sess, data_test, **kwargs):
global_step = sess.run(tf.train.get_or_create_global_step())
test_results = self.run_epoch_generator(
sess,
self._test_model,
data_test['test_loader'].get_iterator(),
return_output=True,
training=False)
# y_preds: a list of (batch_size, horizon, num_nodes, output_dim)
test_loss, y_preds = test_results['loss'], test_results['outputs']
utils.add_simple_summary(self._writer, ['loss/test_loss'], [test_loss],
global_step=global_step)
y_preds = np.concatenate(y_preds, axis=0)
return y_preds
def evaluate(self, sess, **kwargs):
y_preds_all = []
half_length = int(len(self.clusters) / 2)
sclusters = self.clusters[0:32]
for cluster in sclusters:
node_count, adj_mx = self.cluster_data(cluster)
adj_mx = utils.calculate_random_walk_matrix(adj_mx).T
adj_mx = self._build_sparse_matrix(adj_mx)
global_step = sess.run(tf.train.get_or_create_global_step())
scaler_path = self._kwargs['data'].get(
'dataset_dir') + '/scaler.npy'
scaler_data_ = np.load(scaler_path)
mean, var = scaler_data_[0], scaler_data_[1]
scaler = StandardScaler(mean=mean, std=var)
# change val to test before run
test_data_path = self._kwargs['data'].get(
'dataset_dir') + '/test_' + str(cluster) + '.tfrecords'
test_dataset = tf.data.TFRecordDataset([test_data_path])
test_dataset = test_dataset.map(self._parse_record_fn)
test_dataset = test_dataset.make_one_shot_iterator()
test_next_element = test_dataset.get_next()
test_results = self.run_epoch_generator(sess,
self._test_model,
test_next_element,
adj_mx,
return_output=True,
training=False)
test_loss, y_preds = test_results['loss'], test_results['outputs']
utils.add_simple_summary(self._writer, ['loss/test_loss'],
[test_loss],
global_step=global_step)
y_preds = np.concatenate(y_preds, axis=0)
y_preds = scaler.inverse_transform(y_preds[:, self.horizon - 1, :,
0])
y_preds = y_preds[:, 0:node_count]
y_preds_all.append(y_preds)
y_preds_all = np.concatenate(y_preds_all, axis=1)
return y_preds_all
def _train(self,
sess,
base_lr,
epoch,
steps,
patience=50,
epochs=100,
min_learning_rate=2e-6,
lr_decay_ratio=0.1,
save_model=1,
test_every_n_epochs=10,
save_epoch_interval=5,
**train_kwargs):
history = []
min_val_loss = float('inf')
wait = 0
max_to_keep = train_kwargs.get('max_to_keep', 100)
model_metaname = train_kwargs.get('model_metaname')
if model_metaname is not None:
pass
#saver = tf.train.import_meta_graph(os.path.join('data/model/dcrnn_DR_2_h_12_64-64_lr_0.005_bs_32_0131205604_test', model_metaname))
else:
saver = tf.train.Saver(tf.global_variables(),
max_to_keep=max_to_keep)
model_filename = train_kwargs.get('model_filename')
if model_filename is not None:
saver.restore(
sess, os.path.join(self._kwargs['base_dir'], model_filename))
self._epoch = epoch + 1
else:
sess.run(tf.global_variables_initializer())
self._logger.info('Start training ...')
while self._epoch <= epochs:
# Learning rate schedule.
new_lr = max(
min_learning_rate,
base_lr *
(lr_decay_ratio**np.sum(self._epoch >= np.array(steps))))
self.set_lr(sess=sess, lr=new_lr)
start_time = time.time()
train_results = self.run_epoch_generator(
sess,
'train',
self._train_model,
self._data['train_loader'].get_iterator(),
None,
training=True,
return_output=True,
writer=self._writer)
train_loss, train_mae = train_results['loss'], train_results['mae']
if train_loss > 1e5:
self._logger.warning('Gradient explosion detected. Ending...')
break
global_step = sess.run(tf.train.get_or_create_global_step())
# Compute validation error.
print(
'--------------------------------------------------------------------------------'
)
val_results = self.run_epoch_generator(
sess,
'val',
self._test_model,
self._data['val_loader'].get_iterator(),
None,
return_output=True,
training=False)
val_loss, val_mae = np.asscalar(val_results['loss']), np.asscalar(
val_results['mae'])
y_preds = val_results['outputs']
scaler = self._data['scaler']
y_preds = np.concatenate(y_preds, axis=0)
for horizon_i in range(self._data['y_val'].shape[1]):
y_truth = scaler.inverse_transform(
self._data['y_val'][:, horizon_i, :, 0])
print('truth', y_truth[0, :5])
y_pred = scaler.inverse_transform(y_preds[0:5, horizon_i, :,
0])
print('pred', y_pred[0, :5])
utils.add_simple_summary(self._writer, [
'loss/train_loss', 'metric/train_mae', 'loss/val_loss',
'metric/val_mae'
], [train_loss, train_mae, val_loss, val_mae],
global_step=global_step)
end_time = time.time()
message = 'Epoch [{}/{}] ({}) train_mae: {:.4f}, val_mae: {:.4f} lr:{:.6f} {:.1f}s'.format(
self._epoch, epochs, global_step, train_mae, val_mae, new_lr,
(end_time - start_time))
self._logger.info(message)
if self._epoch % test_every_n_epochs == test_every_n_epochs - 1:
self.evaluate(sess)
if val_loss < min_val_loss:
self._logger.info(('Val loss decrease from %.4f to %.4f') %
(min_val_loss, val_loss))
min_val_loss = val_loss
else:
wait += 1
if wait > patience:
self._logger.warning('Early stopping at epoch: %d' %
self._epoch)
break
if self._epoch % save_epoch_interval == 0:
wait = 0
if save_model > 0:
model_filename = self.save(sess, val_loss)
self._logger.info(
'min Val loss %.4f ,Val loss %.4f, saving to %s' %
(min_val_loss, val_loss,
model_filename)) #model_filename
history.append(val_mae)
# Increases epoch.
self._epoch += 1
sys.stdout.flush()
return np.min(history)
def _train(self,
sess,
base_lr,
epoch,
steps,
patience=50,
epochs=100,
min_learning_rate=2e-6,
lr_decay_ratio=0.1,
save_model=1,
test_every_n_epochs=10,
**train_kwargs):
history = []
min_val_loss = float('inf')
wait = 0
max_to_keep = train_kwargs.get('max_to_keep', 100)
saver = tf.train.Saver(tf.global_variables(), max_to_keep=max_to_keep)
model_filename = train_kwargs.get('model_filename')
if model_filename is not None:
saver.restore(sess, model_filename)
self._epoch = epoch + 1
else:
sess.run(tf.global_variables_initializer())
self._logger.info('Start training ...')
while self._epoch <= epochs:
# Learning rate schedule.
new_lr = max(
min_learning_rate,
base_lr *
(lr_decay_ratio**np.sum(self._epoch >= np.array(steps))))
self.set_lr(sess=sess, lr=new_lr)
start_time = time.time()
train_results = self.run_epoch_generator(
sess,
self._train_model,
self._data['train_loader'].get_iterator(),
training=True,
writer=self._writer)
train_loss, train_mae = train_results['loss'], train_results['mae']
if train_loss > 1e5:
self._logger.warning('Gradient explosion detected. Ending...')
break
global_step = sess.run(tf.train.get_or_create_global_step())
# Compute validation error.
val_results = self.run_epoch_generator(
sess,
self._test_model,
self._data['val_loader'].get_iterator(),
training=False)
val_loss, val_mae = np.asscalar(val_results['loss']), np.asscalar(
val_results['mae'])
utils.add_simple_summary(self._writer, [
'loss/train_loss', 'metric/train_mae', 'loss/val_loss',
'metric/val_mae'
], [train_loss, train_mae, val_loss, val_mae],
global_step=global_step)
end_time = time.time()
message = 'Epoch [{}/{}] ({}) train_mae: {:.4f}, val_mae: {:.4f} lr:{:.6f} {:.1f}s'.format(
self._epoch, epochs, global_step, train_mae, val_mae, new_lr,
(end_time - start_time))
self._logger.info(message)
test_every_n_epochs = 1
if self._epoch % test_every_n_epochs == test_every_n_epochs - 1:
self.evaluate(sess)
if val_loss <= min_val_loss:
wait = 0
if save_model > 0:
model_filename = self.save(sess, val_loss)
self._logger.info(
'Val loss decrease from %.4f to %.4f, saving to %s' %
(min_val_loss, val_loss, model_filename))
min_val_loss = val_loss
else:
wait += 1
if wait > patience:
self._logger.warning('Early stopping at epoch: %d' %
self._epoch)
break
history.append(val_mae)
# Increases epoch.
self._epoch += 1
sys.stdout.flush()
return np.min(history)
def _test(self, sess, **kwargs):
global_step = sess.run(tf.train.get_or_create_global_step())
results_summary = pd.DataFrame(index=range(self._run_times))
results_summary['No.'] = range(self._run_times)
n_metrics = 4
# Metrics: MSE, MAE, RMSE, MAPE, ER
metrics_summary = np.zeros(shape=(self._run_times, self._horizon * n_metrics + 1))
for i in range(self._run_times):
self._logger.info('|--- Run time: {}'.format(i))
# y_test = self._prepare_test_set()
test_results = self._run_tm_prediction(sess, model=self._test_model)
# y_preds: a list of (batch_size, horizon, num_nodes, output_dim)
test_loss, y_preds = test_results['loss'], test_results['y_preds']
utils.add_simple_summary(self._writer, ['loss/test_loss'], [test_loss], global_step=global_step)
y_preds = test_results['y_preds']
y_preds = np.concatenate(y_preds, axis=0)
y_truths = test_results['y_truths']
y_truths = np.concatenate(y_truths, axis=0)
scaler = self._data['scaler']
predictions = []
for horizon_i in range(self._horizon):
y_truth = scaler.inverse_transform(y_truths[:, horizon_i, :, 0])
y_pred = scaler.inverse_transform(y_preds[:, horizon_i, :, 0])
predictions.append(y_pred)
mse = metrics.masked_mse_np(preds=y_pred, labels=y_truth, null_val=0)
mae = metrics.masked_mae_np(preds=y_pred, labels=y_truth, null_val=0)
mape = metrics.masked_mape_np(preds=y_pred, labels=y_truth, null_val=0)
rmse = metrics.masked_rmse_np(preds=y_pred, labels=y_truth, null_val=0)
self._logger.info(
"Horizon {:02d}, MSE: {:.2f}, MAE: {:.2f}, RMSE: {:.2f}, MAPE: {:.4f}".format(
horizon_i + 1, mse, mae, rmse, mape
)
)
metrics_summary[i, horizon_i * n_metrics + 0] = mse
metrics_summary[i, horizon_i * n_metrics + 1] = mae
metrics_summary[i, horizon_i * n_metrics + 2] = rmse
metrics_summary[i, horizon_i * n_metrics + 3] = mape
tm_pred = scaler.inverse_transform(test_results['tm_pred'])
g_truth = scaler.inverse_transform(self._data['test_data_norm'][self._seq_len:-self._horizon])
m_indicator = test_results['m_indicator']
er = error_ratio(y_pred=tm_pred,
y_true=g_truth,
measured_matrix=m_indicator)
metrics_summary[i, -1] = er
self._save_results(g_truth=g_truth, pred_tm=tm_pred, m_indicator=m_indicator, tag=str(i))
print('ER: {}'.format(er))
for horizon_i in range(self._horizon):
results_summary['mse_{}'.format(horizon_i)] = metrics_summary[:, horizon_i * n_metrics + 0]
results_summary['mae_{}'.format(horizon_i)] = metrics_summary[:, horizon_i * n_metrics + 1]
results_summary['rmse_{}'.format(horizon_i)] = metrics_summary[:, horizon_i * n_metrics + 2]
results_summary['mape_{}'.format(horizon_i)] = metrics_summary[:, horizon_i * n_metrics + 3]
results_summary['er'] = metrics_summary[:, -1]
results_summary.to_csv(self._log_dir + 'results_summary.csv', index=False)
return
def _train(self,
sess,
base_lr,
epoch,
steps,
patience=50,
epochs=100,
min_learning_rate=2e-6,
lr_decay_ratio=0.1,
save_model=1,
test_every_n_epochs=10,
**train_kwargs):
history = []
min_val_loss = float('inf')
wait = 0
training_history = pd.DataFrame()
losses, val_losses = [], []
max_to_keep = train_kwargs.get('max_to_keep', 100)
saver = tf.train.Saver(tf.global_variables(), max_to_keep=max_to_keep)
model_filename = train_kwargs.get('model_filename')
continue_train = train_kwargs.get('continue_train')
if continue_train is True and model_filename is not None:
saver.restore(sess, model_filename)
self._epoch = epoch + 1
else:
sess.run(tf.global_variables_initializer())
self._logger.info('Start training ...')
while self._epoch <= epochs:
self._logger.info('Training epoch: {}/{}'.format(
self._epoch, epochs))
# Learning rate schedule.
new_lr = max(
min_learning_rate,
base_lr *
(lr_decay_ratio**np.sum(self._epoch >= np.array(steps))))
self.set_lr(sess=sess, lr=new_lr)
start_time = time.time()
train_results = self.run_epoch_generator(
sess,
self.model,
self._data['train_loader'].get_iterator(),
training=True,
writer=self._writer)
train_loss, train_mse = train_results['loss'], train_results['mse']
# if train_loss > 1e5:
# self._logger.warning('Gradient explosion detected. Ending...')
# break
global_step = sess.run(tf.train.get_or_create_global_step())
# Compute validation error.
val_results = self.run_epoch_generator(
sess,
self.model,
self._data['val_loader'].get_iterator(),
training=False)
val_loss, val_mse = val_results['loss'].item(
), val_results['mse'].item()
utils.add_simple_summary(self._writer, [
'loss/train_loss', 'metric/train_mse', 'loss/val_loss',
'metric/val_mse'
], [train_loss, train_mse, val_loss, val_mse],
global_step=global_step)
end_time = time.time()
message = 'Epoch [{}/{}] ({}) train_mse: {:f}, val_mse: {:f} lr:{:f} {:.1f}s'.format(
self._epoch, epochs, global_step, train_mse, val_mse, new_lr,
(end_time - start_time))
self._logger.info(message)
if val_loss <= min_val_loss:
wait = 0
if save_model > 0:
model_filename = self.save(sess, val_loss)
self._logger.info(
'Val loss decrease from %f to %f, saving to %s' %
(min_val_loss, val_loss, model_filename))
min_val_loss = val_loss
else:
wait += 1
if wait > patience:
self._logger.warning('Early stopping at epoch: %d' %
self._epoch)
break
history.append(val_mse)
# Increases epoch.
self._epoch += 1
losses.append(train_loss)
val_losses.append(val_loss)
sys.stdout.flush()
training_history['epoch'] = np.arange(self._epoch)
training_history['loss'] = losses
training_history['val_loss'] = val_losses
training_history.to_csv(self._log_dir + 'training_history.csv',
index=False)
return np.min(history)
def _train(self,
sess,
base_lr,
epoch,
steps,
patience=50,
epochs=100,
min_learning_rate=2e-6,
lr_decay_ratio=0.1,
save_model=1,
test_every_n_epochs=10,
**train_kwargs):
history = []
min_val_loss = float('inf')
wait = 0
max_to_keep = train_kwargs.get('max_to_keep', 100)
saver = tf.train.Saver(tf.global_variables(), max_to_keep=max_to_keep)
model_filename = train_kwargs.get('model_filename')
output_file = train_kwargs.get('preds_file')
gt_file = train_kwargs.get('groundtruth_file')
if model_filename is not None:
saver.restore(sess, model_filename)
self._epoch = epoch + 1
else:
sess.run(tf.global_variables_initializer())
self._logger.info('Start training ...')
while self._epoch <= epochs:
# Learning rate schedule.
new_lr = max(
min_learning_rate,
base_lr *
(lr_decay_ratio**np.sum(self._epoch >= np.array(steps))))
self.set_lr(sess=sess, lr=new_lr)
start_time = time.time()
train_results = self.run_epoch_generator(
sess,
self._train_model,
self._data['train_loader'].get_iterator(),
training=True,
writer=self._writer)
train_loss, train_mae, train_reg = train_results[
'loss'], train_results['mae'], train_results['reg']
#print ('reg loss is:', train_reg)
if train_loss > 1e5:
self._logger.warning('Gradient explosion detected. Ending...')
break
global_step = sess.run(tf.train.get_or_create_global_step())
# Compute validation error.
val_results = self.run_epoch_generator(
sess,
self._test_model,
self._data['val_loader'].get_iterator(),
training=False)
val_loss, val_mae = np.asscalar(val_results['loss']), np.asscalar(
val_results['mae'])
utils.add_simple_summary(self._writer, [
'loss/train_loss', 'metric/train_mae', 'loss/val_loss',
'metric/val_mae'
], [train_loss, train_mae, val_loss, val_mae],
global_step=global_step)
end_time = time.time()
message = 'Epoch [{}/{}] ({}) train_mae: {:.4f}, val_mae: {:.4f} lr:{:.6f} {:.1f}s'.format(
self._epoch, epochs, global_step, train_mae, val_mae, new_lr,
(end_time - start_time))
self._logger.info(message)
stt = time.time()
outputs = self.evaluate(sess)
#print (outputs['groundtruth'].shape)
test_gdt = outputs['groundtruth'][:, :, :, 0]
test_y = outputs['observed'][:, :, :, 0]
best_pred = outputs['predictions'][:test_gdt.shape[0], :, :, 0]
test_gdt = test_gdt.reshape(
test_gdt.shape[0], -1, order='F'
) # record the corresponding steps for each node first, then node by node
test_y = test_y.reshape(test_gdt.shape[0], -1, order='F')
best_pred = best_pred.reshape(test_gdt.shape[0], -1, order='F')
scaler = self._data['scaler']
print('Test running time: %fs' % (time.time() - stt))
# --------
# best_pred = scaler.inverse_transform(best_pred)
# # np.save('best_pred.npy', best_pred)
# mape = metrics.masked_mape_np(best_pred, test_y, test_gdt, null_val=0)
# rmse = metrics.masked_rmse_np(best_pred, test_y, test_gdt, null_val=0)
# self._logger.info(
# 'Overall Test MAPE %.4f, RMSE %.4f' % (mape, rmse))
# --------
if val_loss <= min_val_loss:
wait = 0
if save_model > 0:
model_filename = self.save(sess, val_loss)
self._logger.info(
'Val loss decrease from %.4f to %.4f, saving to %s' %
(min_val_loss, val_loss, model_filename))
min_val_loss = val_loss
test_y = scaler.inverse_transform(test_y)
best_pred = scaler.inverse_transform(best_pred)
# np.save('best_pred.npy', best_pred)
mape = metrics.masked_mape_np(best_pred,
test_y,
test_gdt,
null_val=0)
rmse = metrics.masked_rmse_np(best_pred,
test_y,
test_gdt,
null_val=0)
self._logger.info('Overall Test MAPE %.4f, RMSE %.4f' %
(mape, rmse))
print(best_pred.shape)
#np.savetxt(output_file, best_pred, delimiter = ',')
#np.savetxt(gt_file, test_gdt, delimiter = ',')
else:
wait += 1
if wait > patience:
self._logger.warning('Early stopping at epoch: %d' %
self._epoch)
break
# test_y = scaler.inverse_transform(test_y)
# best_pred = scaler.inverse_transform(best_pred)
# mape = metrics.masked_mape_np(best_pred, test_y, test_gdt, null_val=0)
# rmse = metrics.masked_rmse_np(best_pred, test_y, test_gdt, null_val=0)
# self._logger.info(
# 'Overall Test MAPE %.4f, RMSE %.4f' % (mape, rmse))
history.append(val_mae)
# Increases epoch.
self._epoch += 1
sys.stdout.flush()
return np.min(history)
def _train(self,
sess,
base_lr,
epoch,
steps,
patience=50,
epochs=100,
min_learning_rate=2e-6,
lr_decay_ratio=0.1,
save_model=1,
test_every_n_epochs=10,
**train_kwargs):
history = []
min_val_loss = float('inf')
wait = 0
max_to_keep = train_kwargs.get('max_to_keep', 100)
saver = tf.train.Saver(
tf.global_variables(),
max_to_keep=max_to_keep) # 第一个参数var_list指定要保存和恢复的变量
model_filename = train_kwargs.get('model_filename')
if model_filename is not None:
saver.restore(sess, model_filename)
self._epoch = epoch + 1
else:
sess.run(tf.global_variables_initializer())
self._logger.info('Start training ...')
while self._epoch <= epochs:
# Learning rate schedule.
new_lr = max(
min_learning_rate,
base_lr *
(lr_decay_ratio**np.sum(self._epoch >= np.array(steps))))
self.set_lr(sess=sess, lr=new_lr)
start_time = time.time()
train_results = self.run_epoch_generator(
sess,
self._train_model,
self._data['train_loader'].get_iterator(),
training=True,
writer=self._writer)
train_loss, train_mae = train_results['loss'], train_results['mae']
if train_loss > 1e5:
self._logger.warning('Gradient explosion detected. Ending...')
break
global_step = sess.run(tf.train.get_or_create_global_step())
'''
global_step refer to the number of batches seen by the graph.
Everytime a batch is provided, the weights are updated in the direction that minimizes the loss.
global_step just keeps track of the number of batches seen so far.
When it is passed in the minimize() argument list, the variable is increased by one. Have a look at optimizer.minimize().
You can get the global_step value using tf.train.global_step().
The 0 is the initial value of the global step in this context.
讲解global_step的好博客：https://blog.csdn.net/leviopku/article/details/78508951
'''
# Compute validation error.
val_results = self.run_epoch_generator(
sess,
self._test_model,
self._data['val_loader'].get_iterator(),
training=False)
val_loss, val_mae = np.asscalar(val_results['loss']), np.asscalar(
val_results['mae'])
utils.add_simple_summary(self._writer, [
'loss/train_loss', 'metric/train_mae', 'loss/val_loss',
'metric/val_mae'
], [train_loss, train_mae, val_loss, val_mae],
global_step=global_step)
end_time = time.time()
message = 'Epoch [{}/{}] ({}) train_mae: {:.4f}, val_mae: {:.4f} lr:{:.6f} {:.1f}s'.format(
self._epoch, epochs, global_step, train_mae, val_mae, new_lr,
(end_time - start_time))
self._logger.info(message)
if self._epoch % test_every_n_epochs == test_every_n_epochs - 1:
self.evaluate(sess)
if val_loss <= min_val_loss:
wait = 0
if save_model > 0:
model_filename = self.save(
sess,
val_loss) # save()同时记录了config_x.yaml配置文件(x=epoch)
self._logger.info(
'Val loss decrease from %.4f to %.4f, saving to %s' %
(min_val_loss, val_loss, model_filename))
min_val_loss = val_loss
else:
wait += 1
if wait > patience:
self._logger.warning('Early stopping at epoch: %d' %
self._epoch)
break
history.append(val_mae)
# Increases epoch.
self._epoch += 1
sys.stdout.flush() # 即将缓冲区中的数据立刻写入文件，同时清空缓冲区，不需要是被动的等待输出缓冲区写入
return np.min(history)
def _train(self,
sess,
base_lr,
epoch,
steps,
patience=50,
epochs=100,
min_learning_rate=2e-6,
lr_decay_ratio=0.1,
save_model=1,
test_every_n_epochs=10,
**train_kwargs):
val_history, train_history = [], []
min_val_loss = float('inf')
wait = 0
steps.append(
float('inf')) # to keep finial learning rate up to the end
max_to_keep = train_kwargs.get('max_to_keep', 100)
cl_decay_steps = self._model_kwargs.get('cl_decay_steps')
saver = tf.train.Saver(tf.global_variables(), max_to_keep=max_to_keep)
model_filename = train_kwargs.get('model_filename')
if model_filename is not None:
saver.restore(sess, model_filename)
self._epoch = epoch + 1
min_val_loss = float(
os.path.basename(model_filename).split('-')[1])
else:
sess.run(tf.global_variables_initializer())
self._logger.info('Start training ...')
while self._epoch < epochs:
# Learning rate schedule.
new_lr = max(
min_learning_rate,
base_lr *
(lr_decay_ratio**np.sum(self._epoch >= np.array(steps))))
self.set_lr(sess=sess, lr=new_lr)
start_time = time.time()
train_results = self.run_epoch_generator(
sess,
self._train_model,
self._data['train_loader'].get_iterator(),
training=True,
writer=self._writer)
train_loss, train_mae = train_results['loss'], train_results['mae']
if train_loss > 1e5:
self._logger.warning('Gradient explosion detected. Ending...')
break
global_step = sess.run(tf.train.get_or_create_global_step())
# Compute validation error.
val_results = self.run_epoch_generator(
sess,
self._test_model,
self._data['val_loader'].get_iterator(),
training=False)
val_loss, val_mae = np.asscalar(val_results['loss']), np.asscalar(
val_results['mae'])
utils.add_simple_summary(self._writer, [
'loss/train_loss', 'metric/train_mae', 'loss/val_loss',
'metric/val_mae'
], [train_loss, train_mae, val_loss, val_mae],
global_step=global_step)
end_time = time.time()
cl_threshold = self._train_model._compute_sampling_threshold(
global_step,
cl_decay_steps).eval() # current sampling probability of cl
message = 'Epoch [{}/{}] ({}) train_mae: {:.5f}, val_mae: {:.5f}, lr: {:.5f}, cl_thres: {:.3f}, t: {:.1f}min'.format(
self._epoch, epochs, global_step, train_mae, val_mae, new_lr,
cl_threshold, (end_time - start_time) / 60)
self._logger.info(message)
if self._epoch % test_every_n_epochs == test_every_n_epochs - 1:
self.evaluate(sess)
if val_loss <= min_val_loss:
wait = 0
if save_model > 0:
model_filename = self.save(sess, val_loss)
self._logger.info(
'Val loss decrease from %.4f to %.4f, saving to %s' %
(min_val_loss, val_loss, model_filename))
min_val_loss = val_loss
else:
wait += 1
if wait >= patience:
self._logger.warning('Lowering learning rate preliminary.')
val_history.append(val_mae)
train_history.append(train_mae)
# Restore best weights before lowering lr in next epoch.
if steps[np.sum(self._epoch >= np.array(steps)
)] == self._epoch + 1 or wait >= patience:
self._logger.info('Restore model from epoch {}: {}'.format(
(self._epoch - wait), os.path.basename(model_filename)))
saver.restore(sess, model_filename)
self._epoch = self._epoch - wait # Go back to epoch...
steps[np.sum(self._epoch >= np.array(steps))] = self._epoch + 1
wait = 0 # Reset patience iterator.
# Increases epoch.
self._epoch += 1
sys.stdout.flush()
return val_history, train_history