def test(model, config, word_to_id, cat_to_id, id_to_cat):
print("Loading test data_loaders...")
start_time = time.time()
x_test, y_test = process_file(config.test_dir, word_to_id, cat_to_id,
config.seq_length)
with tf.Session() as session:
session.run(tf.global_variables_initializer())
saver = tf.train.Saver()
# 读取保存的模型
saver.restore(sess=session, save_path=config.save_dir)
print('Testing...')
loss_test, acc_test = evaluate(session, model, x_test, y_test)
msg = 'Test Loss: {0:>6.2}, Test Acc: {1:>7.2%}'
print(msg.format(loss_test, acc_test))
batch_size = 128
data_len = len(x_test)
num_batch = int((data_len - 1) / batch_size) + 1
y_test_cls = np.argmax(y_test, 1)
# 用于存储预测结果
y_pred_cls = np.zeros(shape=len(x_test), dtype=np.int32)
# 逐批次处理
for i in range(num_batch):
start_id = i * batch_size
end_id = min((i + 1) * batch_size, data_len)
feed_dict = {
model.input_x: x_test[start_id:end_id],
model.keep_prob: 1.0
}
y_pred_cls[start_id:end_id] = session.run(model.y_pred_cls,
feed_dict=feed_dict)
# 评估
print("PRF:")
print(
metrics.classification_report(y_test_cls,
y_pred_cls,
target_names=id_to_cat))
# 混淆矩阵
print("Confusion Matrix:")
print("Truth \ Prediction")
cm = metrics.confusion_matrix(y_test_cls, y_pred_cls)
print(cm)
time_dif = get_time_dif(start_time)
print("Time usage:", time_dif)
def train(model, config, word_to_id, cat_to_id):
print("Configuring TensorBoard and Saver...")
# 配置 Tensorboard，重新训练时，请将tensorboard文件夹删除，不然图会覆盖
tensorboard_dir = config.tensorboard_dir
if not os.path.exists(tensorboard_dir):
os.makedirs(tensorboard_dir)
tf.summary.scalar("loss", model.loss)
tf.summary.scalar("accuracy", model.acc)
merged_summary = tf.summary.merge_all()
writer = tf.summary.FileWriter(tensorboard_dir)
# 配置 Saver
saver = tf.train.Saver()
if not os.path.exists(config.save_dir):
os.makedirs(config.save_dir)
print("Loading training and validation data_loaders...")
# 载入训练集与验证集
start_time = time.time()
x_train, y_train = process_file(config.train_dir, word_to_id, cat_to_id,
config.seq_length)
x_val, y_val = process_file(config.val_dir, word_to_id, cat_to_id,
config.seq_length)
time_dif = get_time_dif(start_time)
print("Time usage:", time_dif)
# 创建session
with tf.Session() as session:
session.run(tf.global_variables_initializer())
writer.add_graph(session.graph)
print('Training and evaluating...')
start_time = time.time()
total_batch = 0 # 已训练的总批次
best_acc_val = 0.0 # 最佳验证集准确率
last_improved = 0 # 记录上一次有提升是第几个批次
require_improvement = 1000 # 如果超过1000个批次未提升，提前结束训练
flag = False
for epoch in range(config.num_epochs):
print('Epoch:', epoch + 1)
batch_train = batch_iter(x_train, y_train, config.batch_size)
for x_batch, y_batch in batch_train:
feed_dict = create_feed_dict(model, x_batch, y_batch,
config.dropout_keep_prob)
session.run(model.optim, feed_dict=feed_dict) # 运行优化
total_batch += 1
if total_batch % config.save_per_batch == 0:
# 每多少轮次将训练结果写入tensorboard scalar
s = session.run(merged_summary, feed_dict=feed_dict)
writer.add_summary(s, total_batch)
if total_batch % config.print_per_batch == 0:
# 每多少轮次输出在训练集和验证集上的性能
feed_dict[model.keep_prob] = 1.0
loss_train, acc_train = session.run(
[model.loss, model.acc], feed_dict=feed_dict)
loss_val, acc_val = evaluate(session, model, x_val, y_val)
if acc_val > best_acc_val:
# 保存最好结果
best_acc_val = acc_val
last_improved = total_batch
saver.save(sess=session, save_path=config.save_dir)
improved_str = '*'
else:
improved_str = ''
time_dif = get_time_dif(start_time)
msg = 'Iter: {0:>6}, Train Loss: {1:>6.2}, Train Acc: {2:>7.2%},' \
+ ' Val Loss: {3:>6.2}, Val Acc: {4:>7.2%}, Time: {5} {6}'
print(
msg.format(total_batch, loss_train, acc_train,
loss_val, acc_val, time_dif, improved_str))
if total_batch - last_improved > require_improvement:
# 验证集正确率长期不提升，提前结束训练
print("No optimization for a long time, auto-stopping...")
flag = True
break # 跳出循环
if flag: # 同上
break