PaperText_Segmentation/PointerNet/main.py

import sys

import numpy as np
import torch
from tqdm import tqdm
from torch.utils.data import DataLoader, RandomSampler
from transformers import BertTokenizer, AdamW, get_linear_schedule_with_warmup

# from torch.nn import DataParallel
import matplotlib.pyplot as plt
from PointerNet.model import UIEModel
from PointerNet.config import NerArgs
from PointerNet.data_loader import NerDataset, NerCollate, load_and_split_dataset, get_paper_for_predict
from PointerNet.utils.decode import ner_decode, topic_ner_decode
from PointerNet.utils.metrics import calculate_metric, classification_report, get_p_r_f
from pprint import pprint

from PointerNet import config
logger = config.myLog(__name__, log_cate="train_log").getlog()

sigmoid = torch.nn.Sigmoid()


class NerPipeline:
    def __init__(self, model, args):
        self.model = model
        self.args = args
        if "train_path" in dir(self.args):
            self.train_data, self.valid_data, self.test_data = load_and_split_dataset(self.args.train_path,
                                                                                  train_ratio=0.995, valid_ratio=0.003)

    def save_model(self):
        torch.save(self.model.state_dict(), self.args.save_dir)
        torch.save(self.optimizer.state_dict(), self.args.optimizer_save_dir)

    def load_model(self):
        self.model.load_state_dict(torch.load(self.args.save_dir, map_location="cpu"))
        self.model.to(self.args.device)

    def build_optimizer_and_scheduler(self, t_total):
        module = (
            self.model.module if hasattr(self.model, "module") else self.model
        )

        # 差分学习率
        no_decay = ["bias", "LayerNorm.weight"]
        model_param = list(module.named_parameters())

        bert_param_optimizer = []
        other_param_optimizer = []

        for name, para in model_param:
            space = name.split('.')
            # print(name)
            if "bert" in space[0]:
                bert_param_optimizer.append((name, para))
            else:
                other_param_optimizer.append((name, para))

        optimizer_grouped_parameters = [
            # bert other module
            {"params": [p for n, p in bert_param_optimizer if not any(nd in n for nd in no_decay)],
             "weight_decay": self.args.weight_decay, 'lr': self.args.lr},
            {"params": [p for n, p in bert_param_optimizer if any(nd in n for nd in no_decay)],
             "weight_decay": 0.0, 'lr': self.args.lr},

            # 其他模块，差分学习率
            {"params": [p for n, p in other_param_optimizer if not any(nd in n for nd in no_decay)],
             "weight_decay": self.args.weight_decay, 'lr': self.args.other_lr},
            {"params": [p for n, p in other_param_optimizer if any(nd in n for nd in no_decay)],
             "weight_decay": 0.0, 'lr': self.args.other_lr},
        ]

        optimizer = AdamW(optimizer_grouped_parameters, lr=self.args.lr, eps=self.args.adam_epsilon)
        scheduler = get_linear_schedule_with_warmup(
            optimizer, num_warmup_steps=int(self.args.warmup_proportion * t_total), num_training_steps=t_total
        )

        return optimizer, scheduler

    def eval_forward(self, data_loader):
        s_logits, e_logits = [], []
        self.model.eval()
        for eval_step, batch_data in enumerate(data_loader):
            # for key in batch_data.keys():
            #     batch_data[key] = batch_data[key].to(self.args.device)
            output = model(batch_data['input_ids'],
                           batch_data['attention_mask'],
                           )
            
            start_logits = output["ner_output"]["ner_start_logits"]
            end_logits = output["ner_output"]["ner_end_logits"]
            for i in range(len(start_logits)):
                s_logits.append([start_logits[i]])
                e_logits.append([end_logits[i]])

        return s_logits, e_logits
    
    def half_batch_eval_forward(self, data_loader):
        """
        本项目batch_size=1,一个批次为一个文档样本，包含句子太多时，需要截断再分批前向计算
        不过此时无须反馈学习，耗显存不会很大，一次性计算的句子可以更多
        """
        s_logits, e_logits, con_logits = [], [], []
        self.model.eval()
        for eval_step, batch_data in enumerate(data_loader):
            max_input_len = self.args.max_input_sent_num
            # 本项目中由于显存限制，batch_size=1，则batch_n=0
            one_data_s_logit, one_data_e_logit, one_data_con_logit = [], [], [] 
            for batch_n in range(len(batch_data['ner_end_labels'])):  
                batch_num = int(len(batch_data['input_ids'][batch_n]) / max_input_len)
                if batch_num > 0:
                    for i in range(batch_num):
                        left, right = i*max_input_len, (i+1)*max_input_len
                        if i == batch_num-1 and len(batch_data['input_ids'][batch_n]) - (i+1)*max_input_len<3:
                            batch_num -= 1
                            break
                        output = self.model(batch_data['input_ids'][batch_n][left:right].to(self.args.device),
                                batch_data['attention_mask'][batch_n][left:right].to(self.args.device))
                        start_logits = output["ner_output"]["ner_start_logits"]
                        end_logits = output["ner_output"]["ner_end_logits"]
                        content_logits = output["ner_output"]["ner_content_logits"]
                        one_data_s_logit.extend(start_logits)
                        one_data_e_logit.extend(end_logits)
                        one_data_con_logit.extend(content_logits)
                if len(batch_data['input_ids'][batch_n]) - batch_num * max_input_len > 0:
                    left = batch_num*max_input_len
                    output = self.model(batch_data['input_ids'][batch_n][left:].to(self.args.device),
                                batch_data['attention_mask'][batch_n][left:].to(self.args.device))
                    start_logits = output["ner_output"]["ner_start_logits"]
                    end_logits = output["ner_output"]["ner_end_logits"]
                    content_logits = output["ner_output"]["ner_content_logits"]
                    one_data_s_logit.extend(start_logits)
                    one_data_e_logit.extend(end_logits)
                    one_data_con_logit.extend(content_logits)
                one_data_s_logit = torch.cat(one_data_s_logit)
                one_data_e_logit = torch.cat(one_data_e_logit)
                one_data_con_logit = torch.cat(one_data_con_logit)

            s_logits.append(one_data_s_logit)
            e_logits.append(one_data_e_logit)
            con_logits.append(one_data_con_logit)
        return s_logits, e_logits, con_logits


    def get_metric(self, s_logits, e_logits, con_logits, callback):
        # batch_size = len(callback)
        total_count = [0 for _ in range(len(self.args.id2label))]
        role_metric = np.zeros([len(self.args.id2label), 3])
        for s_logit, e_logit, con_logit, tmp_callback in zip(s_logits, e_logits, con_logits, callback):
            text_list, gt_entities = tmp_callback
            pred_entities = topic_ner_decode(sigmoid(s_logit), sigmoid(e_logit), sigmoid(con_logit),
                                             text_list, self.args.id2label)

            # print("真实起始位置及试题长度：", [i[1] for i in gt_entities['TOPIC']], [len(i[0]) for i in gt_entities['TOPIC']])
            # print("预测起始位置及试题长度：", [i[1] for i in pred_entities['TOPIC']], [len(i[0]) for i in pred_entities['TOPIC']])
            # print("=========预测===============")
            # print(pred_entities)
            # print("==========实际==============")
            # print(gt_entities)
            
            for idx, _type in enumerate(self.args.labels):   # 只有一个label
                if _type not in pred_entities:
                    pred_entities[_type] = []
                total_count[idx] += len(gt_entities[_type])
                role_metric[idx] += calculate_metric(pred_entities[_type], gt_entities[_type])
                                                  
        return role_metric, total_count


    def half_batch_train(self, batch_data, epoch, global_step, t_total):
        """
        本项目batch_size=1,一个批次为一个文档样本，包含句子太多时，需要截断再分批训练
        batch_data: 批次数据,list
        """
        y_loss = []
        max_input_len = self.args.max_input_sent_num
        for batch_n in range(len(batch_data['ner_end_labels'])):  # 本项目中由于显存限制，batch_size=1
            batch_num = int(len(batch_data['input_ids'][batch_n]) / max_input_len)
            print("batch_num:::", batch_num, batch_n, len(batch_data['input_ids'][batch_n]))
            global_step += 1
            if batch_num > 0:
                for i in range(batch_num):
                    left, right = i*max_input_len, (i+1)*max_input_len
                    if i == batch_num-1 and len(batch_data['input_ids'][batch_n]) - (i+1)*max_input_len<3:
                        batch_num -= 1
                        break
                    output = self.model(batch_data['input_ids'][batch_n][left:right].to(self.args.device),
                            batch_data['attention_mask'][batch_n][left:right].to(self.args.device),
                            batch_data['ner_start_labels'][batch_n][left:right].to(self.args.device),
                            batch_data['ner_end_labels'][batch_n][left:right].to(self.args.device),
                            batch_data['ner_content_labels'][batch_n][left:right].to(self.args.device),
                            )
                    loss = output["ner_output"]["ner_loss"]
                    y_loss.append(loss.item())
                    torch.nn.utils.clip_grad_norm_(self.model.parameters(), self.args.max_grad_norm)
                    loss.backward()  # 耗显存
                    self.optimizer.step()
                    self.scheduler.step()
                    self.model.zero_grad()
                    # global_step += 1
                    print('【train】 Epoch: %d/%d Step: %d/%d loss: %.5f' % (
                        epoch, self.args.train_epoch, global_step, t_total, loss.item()))
            if len(batch_data['input_ids']) - batch_num * max_input_len > 0:
                left = batch_num*max_input_len
                output = self.model(batch_data['input_ids'][batch_n][left:].to(self.args.device),
                            batch_data['attention_mask'][batch_n][left:].to(self.args.device),
                            batch_data['ner_start_labels'][batch_n][left:].to(self.args.device),
                            batch_data['ner_end_labels'][batch_n][left:].to(self.args.device),
                            batch_data['ner_content_labels'][batch_n][left:].to(self.args.device),
                            )
                loss = output["ner_output"]["ner_loss"]
                y_loss.append(loss.item())
                torch.nn.utils.clip_grad_norm_(self.model.parameters(), self.args.max_grad_norm)
                loss.backward()  # 耗显存
                self.optimizer.step()
                self.scheduler.step()
                self.model.zero_grad()
                # global_step += 1
                print('【train】 Epoch: %d/%d Step: %d/%d loss: %.5f' % (
                    epoch, self.args.train_epoch, global_step, t_total, loss.item()))
        return global_step, sum(y_loss) / len(y_loss)


    def train(self, dev=True):
        train_dataset, train_callback = NerDataset(data=self.train_data,
                                                   tokenizer=self.args.tokenizer,
                                                   max_len=self.args.max_seq_len,
                                                   label_list=self.args.labels)
        print(111111111111111111111111111111)
        collate = NerCollate(max_len=self.args.max_seq_len, label2id=self.args.label2id)
        print(222222222222222222222222222222)
        train_sampler = RandomSampler(train_dataset)
        train_loader = DataLoader(dataset=train_dataset,
                                  batch_size=self.args.train_batch_size,
                                  sampler=train_sampler,
                                  num_workers=10,  # 多进程加载数据
                                  collate_fn=collate.collate_fn)
        dev_loader = None
        dev_callback = None
        if dev:
            dev_dataset, dev_callback = NerDataset(data=self.valid_data,
                                                   tokenizer=self.args.tokenizer,
                                                   max_len=self.args.max_seq_len,
                                                   label_list=self.args.labels)
            dev_loader = DataLoader(dataset=dev_dataset,
                                    batch_size=self.args.eval_batch_size,
                                    shuffle=False,
                                    num_workers=10,
                                    collate_fn=collate.collate_fn)

        t_total = len(train_loader) * self.args.train_epoch
        self.optimizer, self.scheduler = self.build_optimizer_and_scheduler(t_total)

        global_step = 0
        self.model.zero_grad()
        self.model.to(self.args.device)
        # if torch.cuda.device_count() > 1:  # 多GPU训练时，要求数据在送入model()前也要加载到gpu中
        #     self.model = DataParallel(self.model, device_ids=[0,1])
        eval_step = self.args.eval_step
        best_f1 = 0.
        y_loss = []
        for epoch in range(1, self.args.train_epoch + 1):
            y_loss_bt = [] # 训练过程每一轮的所有loss
            for batch_data in tqdm(train_loader):
                self.model.train()
                # for key in batch_data.keys():
                #     print(batch_data[key])
                #     batch_data[key] = batch_data[key].to(self.args.device)
                global_step, mean_loss = self.half_batch_train(batch_data, epoch, global_step, t_total)
                y_loss_bt.append(mean_loss)

                if dev and global_step % eval_step == 0:
                    # s_logits, e_logits = self.eval_forward(dev_loader)
                    s_logits, e_logits, con_logits = self.half_batch_eval_forward(dev_loader)
                    role_metric, _ = self.get_metric(s_logits, e_logits, con_logits, dev_callback)
                    mirco_metrics = np.sum(role_metric, axis=0)
                    mirco_metrics = get_p_r_f(mirco_metrics[0], mirco_metrics[1], mirco_metrics[2])
                    print('【eval】 precision={:.4f} recall={:.4f} f1_score={:.4f}'.format(mirco_metrics[0],
                                                                                         mirco_metrics[1],
                                                                                         mirco_metrics[2]))
                    logger.info('【eval】 precision={:.4f} recall={:.4f} f1_score={:.4f}'.format(mirco_metrics[0],
                                                                                         mirco_metrics[1],
                                                                                         mirco_metrics[2]))                                            
                    y_loss.append(sum(y_loss_bt) / len(y_loss_bt)) 
                    y_loss_bt = []
                    if mirco_metrics[2] > best_f1:
                        best_f1 = mirco_metrics[2]
                        print("best_f1：{}".format(mirco_metrics[2]))
                        logger.info("best_f1：{}".format(mirco_metrics[2]))
                        self.save_model()
            # 训练完每一轮画图,训练完一轮就很费时间
            x = [i for i in range(len(y_loss))]
            plt.figure()
            plt.plot(x, y_loss)
            plt.savefig(f'loss_curve_{epoch}_epoch.png')  # 保存图片
            plt.show()    

    def test(self):
        test_dataset, test_callback = NerDataset(data=self.test_data,
                                                 tokenizer=self.args.tokenizer,
                                                 max_len=self.args.max_seq_len,
                                                 label_list=self.args.labels)
        collate = NerCollate(max_len=self.args.max_seq_len, label2id=self.args.label2id)
        test_loader = DataLoader(dataset=test_dataset,
                                 batch_size=self.args.eval_batch_size,
                                 shuffle=False,
                                 num_workers=2,
                                 collate_fn=collate.collate_fn)
        self.load_model()
        self.model.to(self.args.device)
        with torch.no_grad():
            # s_logits, e_logits = self.eval_forward(test_loader)
            s_logits, e_logits, con_logits = self.half_batch_eval_forward(test_loader)
            role_metric, total_count = self.get_metric(s_logits, e_logits, con_logits, test_callback)
            mirco_metrics = np.sum(role_metric, axis=0)
            mirco_metrics = get_p_r_f(mirco_metrics[0], mirco_metrics[1], mirco_metrics[2])
            print(
                '[eval] precision={:.4f} recall={:.4f} f1_score={:.4f}'.format(mirco_metrics[0], mirco_metrics[1],
                                                                               mirco_metrics[2]))
            print(classification_report(role_metric, self.args.labels, self.args.id2label, total_count))

    def predict(self, **kwargs):
        # self.load_model()
        # self.model.eval()
        # self.model.to(self.args.device)
        with torch.no_grad():
            print("\n********************************************\n")
            if kwargs:
                sentences = kwargs["text_list"]
                labels = kwargs["labels"] if "labels" in kwargs else []
            else:
                sentences, labels = get_paper_for_predict()
                print(sentences)
                print(labels)
            # 对于单个句子
            # encode_dict = self.args.tokenizer.encode_plus(text=[i for i in text],
            #                         max_length=self.args.max_seq_len,
            #                         padding="max_length",
            #                         truncation="only_first",
            #                         return_token_type_ids=True,
            #                         return_attention_mask=True)
            inputs = self.args.tokenizer(sentences, padding='max_length', truncation=True, 
                                    max_length=self.args.max_seq_len, return_tensors='pt')
            token_ids = inputs['input_ids'].to(self.args.device)
            attention_mask = inputs['attention_mask'].to(self.args.device)

            # tokens = ['[CLS]'] + tokens + ['[SEP]']
            # token_ids = torch.from_numpy(np.array(encode_dict['input_ids'])).unsqueeze(0).to(self.args.device)
            # attention_mask = torch.from_numpy(np.array(encode_dict['attention_mask'])).unsqueeze(0).to(
            #     self.args.device)
            # token_type_ids = torch.from_numpy(np.array(encode_dict['token_type_ids'])).unsqueeze(0).to(self.args.device)
            output = self.model(token_ids, attention_mask)
            start_logits = output["ner_output"]["ner_start_logits"]
            end_logits = output["ner_output"]["ner_end_logits"]
            content_logits = output["ner_output"]["ner_content_logits"]

            start_logits = sigmoid(start_logits[0])
            end_logits = sigmoid(end_logits[0])
            con_logits = sigmoid(content_logits[0])
            
            # print("start_logits:::", start_logits)
            pred_entities, topic_item_pred = topic_ner_decode(start_logits, end_logits, con_logits, sentences, self.args.id2label)
            # pprint(dict(pred_entities))
            split_topic_idx = []
            for i in pred_entities['TOPIC']:
                split_topic_idx.append((i[-1], i[-1]+len(i[0])))
            # print(split_topic_idx)
            return dict(pred_entities), split_topic_idx, topic_item_pred


if __name__ == '__main__':
    
    args = NerArgs()
    model = UIEModel(args)
    
    ner_pipeline = NerPipeline(model, args)

    ner_pipeline.train(dev=True)

    # # 批量测试
    ner_pipeline.test()

    # 单个测试
    # txts = [
    #     '七､解答（本题共8小题，每小题4分，共32分，在给出的四个选项中，', '每小题中只有一个选项符合题目要求。）', '11、如图所示，在$x>0$的空间中，存在沿$x$轴方向的匀强电场$E$；在$x<0$的空间中，存在沿$x$轴负方向的匀强电场，场强大小也为$E$。一电子$(-e,m)$在$x=d$处的$P$点以沿$y$轴正方向的初速度$v__0$', '开始运动，不计电子重力。求：（1）电子的$x$方向分运动的周期。（2）电子运动的轨迹与$y$轴的各个交点中，任意两个交点的距离。【图片】', '【答案】（1）$4sqrt(((2m*d)/(eE)))$；（2）$2nv__0sqrt(((2m*d)/(eE)))(n=1,2,3…)$。', '如图，一导热性能良好、内壁光滑的汽缸水平放置，横截面积$S=1.010^^-3m^2$、质量$m=2kg$、厚度不计的活', '塞与汽缸底部之', '间封闭了一部分理想气体，此时活塞与汽缸底部之间的距离$l=36cm$，在活塞的右侧距离其$d=14cm$处有一对与汽缸固定连接的卡环。气体的温度$t=27*℃$，外界大气压强$p__0=1.010^5Pa$。现将汽缸开口向上竖直放置（$g$取$10m/s^2$）。 (1)求此时活塞与汽缸底部之间的距离$h$； (2)如果将缸内气体加热到$600K$，求此时气体的压强$p$。 【图片】', '【解析】(1)汽缸水平放置时：封闭气体的压强$p__1=p__0=1.010^5Pa$，温度$T__1=300K$，体积$V__1=lS$；汽缸竖直放置时：封闭气体的压强$p__2=p__0+((mg)/S)=1.210^5Pa$，温度$T__2=T__1=300K$，体', '积$V__2=hS$；由玻意耳定律$p__1V__1=p__2V__2$，$h=((p__1V__1)/(p__2S))$，解得$h=0.3m$ (2)温度升高，活塞刚达到卡环，气体做等压变化，此时$p__3=p__2$，$V__2=hS$，$V__3=(l+d)S$，$T__2=300K$，$((V__2)/(T__2))=((V__3)/(T__3))$，$T__3=500K$；汽缸内气体温度继续升高，气体做等容变化$p__3=1.210^5Pa$，$T__3=500K$，$T__4=600K$，$((p__3)/(T__3))=(p/(T__4))$，$p=1.4410^5Pa$  答案:(1)$0.3m$； (2)$1.4410^5Pa$', '5、中国首艘航空母舰“辽宁”号正式交接入列和歼$-15$舰载战斗机成功起降，对于有效维护国家主权、促进世界和平与共同发展，具有重要意义．据了解，该航母长$304m$，宽$70.5m$，', '满载时吃水深度$11m$；若歼$-15$战斗机的质量为$3.310^4$kg，轮胎与甲板总接触面积$6000cm^2$，战斗机在约为$2.510^5N$推力作用下滑跑$20m$用时$5s$．求：$(g=10N/kg$，$ρ__海水=1.0310^3kg/m^3)$ （1）战斗机停在甲板上对甲板的压强； （2）推力做功的功率； （3）满载时海水对舰底的压强．', '答案:（1）战斗机停在甲板上对甲板', '的压强为$3.310^5N$', '； （2）推力做功的功率为$10^6W$； （3）满载时海水对舰底的压强$1.13310^5Pa$．', '解析：已知：$h=11m$，$m=3.310^4kg$，$S=6000cm^2=0.6m^2$，$F=2.510^5N$，$s=20m$，$t=5s$，$g=10N/kg$，$ρ__海水=1.0310^3kg/m^3$ 求：（1）战', '斗机停在甲板上对甲板的压强$p__1$； （2）推力做功的功率P； （3）满载时海水对舰底的压强$p__2$． 解：（1）战斗机对甲板的压力： $F__1=G=mg=3.310^4kg10N/kg=3.310^5N$， 对甲板的压强： $p__1=F__1S=3.310^5N0.6m^2=5.510^5Pa$； （2）推力做的功： $W=Fs=2.510^5N20m=510^6J$， 推力所做的功率： $P=Wt=510^6J5s=10^6W$； （3）满载时海水对舰底的压强： $p__2=ρ__海水gh=1.0310^3kg/m^310N/kg11m=1.13310^5Pa$． 答：（1）战斗机', '停在甲板上对甲板的压强为$3.310^5N$； （2）推力做功的功率为$10^6W$； （3）满载时海水对舰底的压强$1.13310^5Pa$．', '64､已知地球半径为R，地面的重力加度为g，将地球视为均第匀球体，求： （1）距地面$12R$高度处的力加速度 （2）地球的第一宇宙速度 （3）地球的自转周期为T，', '地球同步卫星离地面物的高度', '[答案](1)距地面$12R$高度处的重力加速度是$49g$ (2)地球的步第一宇宙速度是$sqrt(gR)$ (3)若地球的自转周期为T，地球同', '步卫离地面的高度是$root3*(gR^2T^24pi^2)-R$', '解析：（1）由于地球表面物体知随地球转而做圆运动的向心加速度体很小，地面上物体所受重力近似等于地球的万有引力，对地面上的', "物体有$GMmR^2=mg$，同理，对距地高度$12R$处的物体有$GMm*(RR2)^2=mg'$，解得$g'=49g$ （2）对地卫星环绕地心的匀速圆周运动有$GMmR^2=mv^2R$，解地球宇的第速一宇速度$v=sqrt(gR)$ $GMm*(Rh)^2=m*(Rh)*(2*πT)^2$，$GMmR^2=mg$，解得$h=root3*(gR^2T^24pi^2)-R$", '25､重力的方向总是垂直于接触面向下。( )', 'A.正确', 'B，错误', '在实验中，补偿阻力时要把物悬挂在细绳的一端。  A：正确', 'B，错误', '[答案]T', '4､任何情况下，物体的加速度方向始终与它所受的合力方向一致。（ ）  A 正确  B．错误', '【答案】不对的', '10．如果物体处于超重状态，它必然有向上的加速度。（ ）', 'A．正确', 'B、错误', '7．通过打出的纸带可以确定物体运动的时间和物体运动的位移。( )  A，正确', 'B.错误', '答案：错的', '六:多空(本题共11小题，总分48分。其中，1-7题为单选，每小题4分;8-11题为多选,每小题5分，全部选对的得5', '分，选对但不全的得2分,有选错得0分)', '【图片】用烧杯盛某种液体，测得液体体积V和液体与烧杯的共同质量m的关系如图所示．请观察图象并根据图象，求：烧杯的质量__________g；液体的', '密度$ρ__液=$________$kg/m^3$；其物理意义是_____．', '汤现姆孙在研究________的实验中发现了', '电子，电子的发现打破了___________的旧观。', '答案:阴极射；原子不可再分  【解析】汤姆孙在研究阴极射线的实验中发现了电子，电子的发现打破了子不可现再分的旧观念。', '1．我国载人登月已完成关键技术攻关，可送3人', '环月、2人登月。某实验小组在完成用单摆测量重力加速度实验后，讨论在月球上用单摆测量月球表面重力加速度的实验方案。用与地球上相同的实验设备，在月球上进行相同的实验，会得到更精确的结果，试写出其中的两个原因：__', '_____。', '【解析】1.周期变长，累积法测量周期的相对误差减小；2.月球上没有空气阻力，消除了空气阻尼引起的系统误差答案:周期变长，累积法测量周期的相对误差减小；月球上没有空气阻力，消除了空气阻尼引起的系统误差', '26.【图片】电阻A和B的电流与其两端电压的关系如图所示．由图可知，电阻A的阻', '值为________$Ω$；将A和B并联后接在$2.5V$的电源上，电路中的总电流为_A．', '10.教室中未搬入桌凳前说话常有嗡嗡的尾声，摆了桌凳坐满了学生后这种现象减轻到似乎听不到了，这是因为', '___________。', '答案:搬入桌凳和坐满学生后吸声面积增大，混响时间变短。'
    # ]
    # labels = [(2, 5), (5, 10), (10, 18), (18, 24), (24, 27), (27, 30), (30, 32), (32, 35), (35, 38), (40, 42), (42, 45), (45, 49), (49, 51), (51, 54)]
    # ner_pipeline.predict(text_list=txts, labels=labels)
    # ner_pipeline.predict()

    # print()