def init_model(model_path):
model = BERTForMultiLabelSequenceClassification(config)
model.load_state_dict(
torch.load(model_path, map_location=torch.device('cpu')))
model.eval()
model.to(config.device)
return model
def convert(model_path, to_onnx_path):
config = Config('.')
opset_version = 11
use_gpu = torch.cuda.is_available()
device = torch.device("cuda:0" if use_gpu else "cpu")
print(device)
# print(device)
# device = torch.device('cpu')
inputs = {
'input_ids': torch.ones([1, 32], dtype=torch.long).to(device),
'token_type_ids': torch.ones([1, 32], dtype=torch.long).to(device),
'attention_mask': torch.ones([1, 32], dtype=torch.long).to(device)
}
# print(len(tuple(inputs.values())))
model = BERTForMultiLabelSequenceClassification(config, config.num_classes)
model.load_state_dict(
torch.load(model_path, map_location=torch.device('cpu')))
model.eval()
model.to(device)
with torch.no_grad():
symbolic_names = {0: 'batch_size', 1: 'max_seq_len'}
logits_name = {0: 'batch_size', 1: 'num_class'}
torch.onnx.export(
model,
args=tuple(inputs.values()),
f=to_onnx_path,
verbose=True,
opset_version=opset_version,
do_constant_folding=True,
input_names=['input_ids', 'segment_ids', 'input_mask'],
output_names=['logits'],
dynamic_axes={
'input_ids': symbolic_names,
'segment_ids': symbolic_names,
'input_mask': symbolic_names,
'logits': logits_name
})
print('model exported at', to_onnx_path)
class Predict:
def __init__(self,
config,
model_path,
label_path,
bert_path='chinese-bert-wwm',
max_seq_length=32):
self.config = config
self.model_path = model_path
self.label_path = label_path
self.bert_path = bert_path
self.model = BERTForMultiLabelSequenceClassification(
self.config, self.config.num_classes)
self.model.load_state_dict(
torch.load(self.model_path, map_location=torch.device('cpu')))
self.model.half()
self.model.eval()
self.model.to(self.config.device)
self.tokenizer = BertTokenizer.from_pretrained(self.bert_path)
self.max_seq_length = max_seq_length
self.processor = TextProcessor()
self.labels = self.processor.get_labels(self.label_path)
self.label2id = {label: id_ for id_, label in enumerate(self.labels)}
self.id2label = {id_: label for id_, label in enumerate(self.labels)}
def run(self, record):
'''
预测小类标签
'''
text_a, text_b = record[0], record[1]
example = self.processor._create_single_example(text_a, text_b)
feature = convert_single_example(example, self.max_seq_length,
self.tokenizer)
input_ids = torch.tensor(feature.input_ids,
dtype=torch.long).unsqueeze(0).to(
self.config.device)
segment_ids = torch.tensor(feature.segment_ids,
dtype=torch.long).unsqueeze(0).to(
self.config.device)
input_mask = torch.tensor(feature.input_mask,
dtype=torch.long).unsqueeze(0).to(
self.config.device)
# print(input_ids)
# print(segment_ids)
# print(input_mask)
logits = self.model(input_ids, segment_ids, input_mask).detach()
# print(logits)
prob = logits.sigmoid()[:, 1].tolist() #[0.123]
# prob = torch.sigmoid(logits)
# return prob[0].cpu().tolist()[0]
return prob[0]
def collect_badcase(self, data_path):
badcase = []
cnt = 0
with open(data_path, 'r', encoding='utf-8') as reader:
for record in reader:
print(f'第{cnt+1}条记录...')
cnt += 1
text_a, text_b, label = record.strip().split('\t')
pre = self.run([text_a, text_b])
if pre > 0.5:
pre_label = '1'
else:
pre_label = '0'
if pre_label != label:
badcase.append('\t'.join(
[text_a, text_b, label, pre_label,
str(pre)]))
return badcase
def evaluate(self, data_path):
'''在全部的数据集上对模型进行测试
'''
labels = []
pres = []
cnt = 0
with open(data_path, 'r', encoding='utf-8') as reader:
for record in reader:
print(f'第{cnt+1}条记录...')
cnt += 1
text_a, text_b, label = record.strip().split('\t')
pre = self.run([text_a, text_b])
labels.append(int(label))
pres.append(pre)
fpr, tpr, th = roc_curve(labels, pres, pos_label=1)
auc_score = auc(fpr, tpr)
return auc_score, pres
def inference(self, data_path, to_path):
pres = []
cnt = 0
with open(data_path, 'r', encoding='utf-8') as reader:
for record in reader:
print(f'第{cnt+1}条记录...')
cnt += 1
text_a, text_b = record.strip().split('\t')
pre = self.run([text_a, text_b])
pres.append(pre)
with open(to_path, 'w', encoding='utf-8') as writer:
for pre in pres:
writer.write(str(pre) + '\n')