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train.py
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train.py
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import os
import argparse
import json
import numpy as np
import torch
from torch.utils.data import DataLoader
import transformers
from transformers import BertTokenizer, BertConfig
from transformers import get_linear_schedule_with_warmup
from datasets import IntentSlotDataset
from models import JointBert
from tools import save_module
from detector import JointIntentSlotDetector
def evaluate_model(args, model, tokenizer, test_data, intent_dict, slot_dict):
def calculate_slot_precision(p_slots, o_slots):
results = []
for slot_name, slot_value_list in p_slots.items():
for slot_value in slot_value_list:
results.append(float(slot_name in o_slots and slot_value in o_slots[slot_name]))
if len(results) == 0:
return 1.
return np.mean(results)
def filter_slots(text, slots):
outputs = {}
for slot_name, slot_value_list in slots.items():
output_value_list = []
for slot_value in slot_value_list:
if slot_value in text:
output_value_list.append(slot_value)
if len(output_value_list) > 0:
outputs[slot_name] = output_value_list
return outputs
detector = JointIntentSlotDetector(
model=model,
tokenizer=tokenizer,
intent_dict=intent_dict,
slot_dict=slot_dict
)
intent_acc_results = []
slot_precision_results = []
slot_recall_results = []
for item in test_data:
outputs = detector.detect(item['text'])
label_slots = filter_slots(item['text'], item['slots'])
intent_acc_results.append(float(outputs['intent'] == item['intent']))
slot_precision_results.append(calculate_slot_precision(outputs['slots'], label_slots))
slot_recall_results.append(calculate_slot_precision(label_slots, outputs['slots']))
return np.mean(intent_acc_results), np.mean(slot_precision_results), np.mean(slot_recall_results)
def train(args):
#-----------set cuda environment-------------
os.environ["CUDA_VISIBLE_DEVICES"] = args.cuda_devices
device = "cuda" if torch.cuda.is_available() and not args.no_cuda else "cpu"
#-----------load tokenizer-----------
tokenizer = BertTokenizer.from_pretrained(args.tokenizer_path)
save_module(tokenizer, args.save_dir, module_name="tokenizer", additional_name="")
#-----------load data-----------------
dataset = IntentSlotDataset.load_from_path(
data_path=args.train_data_path,
intent_label_path=args.intent_label_path,
slot_label_path=args.slot_label_path,
tokenizer=tokenizer
)
with open(args.test_data_path, 'r') as f:
test_data = json.load(f)
#-----------load model-----------
model = JointBert.from_pretrained(
args.model_path,
slot_label_num = dataset.slot_label_num,
intent_label_num = dataset.intent_label_num
)
print(model)
model = model.to(device).train()
save_module(model, args.save_dir, module_name='model', additional_name="epoch0")
dataloader = DataLoader(
dataset,
shuffle=True,
batch_size=args.batch_size,
collate_fn=dataset.batch_collate_fn)
#-----------calculate training steps-----------
if args.max_training_steps > 0:
total_steps = args.max_training_steps
else:
total_steps = len(dataset) * args.train_epochs // args.gradient_accumulation_steps // args.batch_size
print('calculated total optimizer update steps : {}'.format(total_steps))
#-----------prepare optimizer and schedule------------
parameter_names_no_decay = ['bias', 'LayerNorm.weight']
optimizer_grouped_parameters = [
{'params': [
para for para_name, para in model.named_parameters()
if not any(nd_name in para_name for nd_name in parameter_names_no_decay)
],
'weight_decay': args.weight_decay},
{'params': [
para for para_name, para in model.named_parameters()
if any(nd_name in para_name for nd_name in parameter_names_no_decay)
],
'weight_decay': 0.0}
]
optimizer = transformers.AdamW(optimizer_grouped_parameters, lr=args.learning_rate, eps=args.adam_epsilon)
scheduler = get_linear_schedule_with_warmup(optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=total_steps)
#-----------training-------------
update_steps = 0
total_loss = 0.
for epoch in range(args.train_epochs):
step = 0
for batch in dataloader:
step += 1
input_ids, intent_labels, slot_labels = batch
outputs = model(
input_ids=torch.tensor(input_ids).long().to(device),
intent_labels=torch.tensor(intent_labels).long().to(device),
slot_labels=torch.tensor(slot_labels).long().to(device)
)
loss = outputs['loss']
total_loss += loss.item()
if args.gradient_accumulation_steps > 1:
loss = loss/args.gradient_accumulation_steps
loss.backward()
if step % args.gradient_accumulation_steps == 0:
torch.nn.utils.clip_grad_norm_(model.parameters(), args.max_grad_norm)
optimizer.step()
scheduler.step()
model.zero_grad()
update_steps += 1
if args.logging_steps > 0 and update_steps % args.logging_steps == 0:
print("total step {} epoch {} : loss {}".format(update_steps, epoch, total_loss / args.logging_steps))
total_loss = 0.
if args.saving_steps > 0 and update_steps % args.saving_steps == 0:
save_module(model, args.save_dir, module_name='model', additional_name="model_step{}".format(update_steps))
if args.saving_epochs > 0 and (epoch+1) % args.saving_epochs == 0:
save_module(model, args.save_dir, module_name='model', additional_name="model_epoch{}".format(epoch))
if update_steps > total_steps:
break
intent_acc, slot_prec, slot_recall = evaluate_model(
args=args,
model=model,
tokenizer=tokenizer,
test_data=test_data,
intent_dict=dataset.intent_label_dict,
slot_dict=dataset.slot_label_dict
)
print('*****evaluation results*****')
print('intent accuracy: {}; slot precision: {}; slot recall: {}'.format(intent_acc, slot_prec, slot_recall))
if __name__ == '__main__':
parser = argparse.ArgumentParser()
# environment parameters
parser.add_argument("--cuda_devices", type=str, default='0', help='set cuda device numbers')
parser.add_argument("--no_cuda", action='store_true', default=False, help='whether use cuda device for training')
# model parameters
parser.add_argument("--tokenizer_path", type=str, default='bert-base-chinese', help="pretrained tokenizer loading path")
parser.add_argument("--model_path", type=str, default='bert-base-chinese', help="pretrained model loading path")
# data parameters
parser.add_argument("--train_data_path", type=str, default='path/to/data.json', help="training data path")
parser.add_argument("--test_data_path", type=str, default='path/to/data.json', help="testing data path")
parser.add_argument("--slot_label_path", type=str, default='data/slot_labels.txt', help="slot label path")
parser.add_argument("--intent_label_path", type=str, default='data/intent_labels.txt', help="intent label path")
# training parameters
parser.add_argument("--save_dir", type=str, default='path/to/save/model', help="directory to save the model")
parser.add_argument("--max_training_steps", type=int, default=0, help = 'max training step for optimizer, if larger than 0')
parser.add_argument("--gradient_accumulation_steps", type=int, default=1, help="number of updates steps to accumulate before performing a backward() pass.")
parser.add_argument("--saving_steps", type=int, default=300, help="parameter update step number to save model")
parser.add_argument("--logging_steps", type=int, default=10, help="parameter update step number to print logging info.")
parser.add_argument("--eval_steps", type=int, default=10, help="parameter update step number to print logging info.")
parser.add_argument("--saving_epochs", type=int, default=1, help="parameter update epoch number to save model")
parser.add_argument("--batch_size", type=int, default=128, help = 'training data batch size')
parser.add_argument("--train_epochs", type=int, default=10, help = 'training epoch number')
parser.add_argument("--learning_rate", type=float, default=5e-5, help = 'learning rate')
parser.add_argument("--adam_epsilon", type=float, default=1e-8, help="epsilon for Adam optimizer")
parser.add_argument("--warmup_steps", type=int, default=0, help="warmup step number")
parser.add_argument("--weight_decay", type=float, default=0.0, help="weight decay rate")
parser.add_argument("--max_grad_norm", type=float, default=1.0, help="maximum norm for gradients")
args = parser.parse_args()
train(args)