physics_repeat_check/data_preprocessing.py

import re
import random
import numpy as np
import pickle
from copy import deepcopy
from bson.binary import Binary
from sentence_transformers import SentenceTransformer

import config
from main_clear.sci_clear import get_maplef_items

# 按数据对应顺序随机打乱数据
def shuffle_data_pair(idx_list, vec_list):
    zip_list = list(zip(idx_list, vec_list))
    random.shuffle(zip_list)
    idx_list, vec_list = zip(*zip_list)
    return idx_list, vec_list


# 通用公有变量
public_id = 0
public_data_index = -1

# 数据预处理
class DataPreProcessing():
    def __init__(self, mongo_coll=None, logger=None, is_train=False):
        # 配置初始数据
        self.mongo_coll = mongo_coll
        self.sbert_model = SentenceTransformer(config.sbert_path)
        self.is_train = is_train
        # 日志采集
        self.logger = logger
        self.log_msg = config.log_msg

    # 主函数
    def __call__(self, origin_dataset, is_retrieve=False):
        # 句向量存储列表
        sent_vec_list = []
        # 批量处理数据字典
        bp_dict = deepcopy(config.batch_processing_dict)

        for data_idx, data in enumerate(origin_dataset):
            # 通用公有变量
            global public_id
            global public_data_index

            public_data_index = data_idx + 1
            # 记录id
            public_id = data["id"] if "id" in data else 0
            
            print(public_id) if self.logger is None else None
            content_clear, content_cut_list = self.content_clear_process(data)
            # 日志采集
            self.logger.info(self.log_msg.format(
                                    id=public_id if public_id!=0 else public_data_index,
                                    type="数据清洗结果",
                                    message=content_clear)) if self.logger and is_retrieve else None
            print(content_clear) if self.logger is None else None

            bp_dict["id_list"].append(data["id"]) if is_retrieve is False else None
            bp_dict["cont_clear_list"].append(content_clear)
            # 将所有截断数据融合进行一次句向量计算
            bp_dict["cont_cut_list"].extend(content_cut_list)
            # 获取每条数据的截断长度
            bp_dict["cut_idx_list"].append(bp_dict["cut_idx_list"][-1] + len(content_cut_list))

            # 设置批量处理长度,若满足条件则进行批量处理
            if (data_idx+1) % 5000 == 0:
                sent_vec_list = self.batch_processing(sent_vec_list, bp_dict, is_retrieve)

                # 数据满足条件处理完毕后,则重置数据结构
                bp_dict = deepcopy(config.batch_processing_dict)
        
        if len(bp_dict["cont_clear_list"]) > 0:
            sent_vec_list = self.batch_processing(sent_vec_list, bp_dict, is_retrieve)

        return sent_vec_list, bp_dict["cont_clear_list"]

    # 数据批量处理计算句向量
    def batch_processing(self, sent_vec_list, bp_dict, is_retrieve):
        vec_list = self.sbert_model.encode(bp_dict["cont_cut_list"])
        # 计算题目中每个句子的完整句向量
        sent_length = len(bp_dict["cut_idx_list"]) - 1
        for i in range(sent_length):
            sentence_vec = np.array([np.nan])
            if bp_dict["cont_clear_list"][i] != '':
                # 平均池化
                sentence_vec = np.sum(vec_list[bp_dict["cut_idx_list"][i]:bp_dict["cut_idx_list"][i+1]], axis=0) \
                               /(bp_dict["cut_idx_list"][i+1]-bp_dict["cut_idx_list"][i])
            sent_vec_list.append(sentence_vec) if self.is_train is False else None

            # 将结果存入数据库
            if is_retrieve is False:
                condition = {"id": bp_dict["id_list"][i]}
                # 用二进制存储句向量以节约存储空间
                sentence_vec_byte = Binary(pickle.dumps(sentence_vec, protocol=-1), subtype=128)
                # 需要新增train_flag,防止机器奔溃重复训练
                update_elements = {"$set": {"content_clear": bp_dict["cont_clear_list"][i],
                                            "sentence_vec": sentence_vec_byte,
                                            "sent_train_flag": config.sent_train_flag}}
                self.mongo_coll.update_one(condition, update_elements)

        return sent_vec_list

    # 清洗函数
    def clear_func(self, content):
        if content in {'', None}:
            return ''
        # 将content字符串化,防止content是int/float型
        if isinstance(content, str) is False:
            if isinstance(content, int) or isinstance(content, float):
                return str(content)
        try:
            # 进行文本清洗
            content_clear = get_maplef_items(content)
        except Exception as e:
            # 通用公有变量
            global public_id
            global public_data_index
            # 日志采集
            print(self.log_msg.format(id=public_id if public_id!=0 else public_data_index,
                                      type="清洗错误: "+str(e),
                                      message=str(content))) if self.logger is None else None
            self.logger.error(self.log_msg.format(id=public_id if public_id!=0 else public_data_index,
                                                  type="清洗错误: "+str(e),
                                                  message=str(content))) if self.logger is not None else None
            
            # 对于无法清洗的文本通过正则表达式直接获取文本中的中文字符
            content_clear = re.sub(r'[^\u4e00-\u9fa5]', '', content)

        return content_clear

    # 重叠截取长文本进行Sentence-Bert训练
    def truncate_func(self, content):
        # 设置长文本截断长度
        cut_length = 150
        # 设置截断重叠长度
        overlap = 10
        content_cut_list = []

        # 若文本长度小于等于截断长度,则取消截取直接返回
        cont_length = len(content)
        if cont_length <= cut_length:
            content_cut_list = [content]
            return content_cut_list

        # 若文本长度大于截断长度,则进行重叠截断
        # 设定文本截断尾部合并阈值(针对尾部文本根据长度进行合并)
        # 防止截断后出现极短文本影响模型效果
        tail_merge_value = 0.5 * cut_length
        for i in range(0,cont_length,cut_length-overlap):
            tail_idx = i + cut_length
            cut_content = content[i:tail_idx]
            # 保留单词完整性
            # 判断尾部字符
            if cont_length - tail_idx > tail_merge_value:
                for j in range(len(cut_content)-1,-1,-1):
                    # 判断当前字符是否为字母或者数字
                    # 若不是字母或者数字则截取成功
                    if re.search('[A-Za-z]', cut_content[j]) is None:
                        cut_content = cut_content[:j+1]
                        break
            else:
                cut_content = content[i:]
            # 判断头部字符
            if i != 0:
                for k in range(len(cut_content)):
                    # 判断当前字符是否为字母或者数字
                    # 若不是字母或者数字则截取成功
                    if re.search('[A-Za-z]', cut_content[k]) is None:
                        cut_content = cut_content[k+1:]
                        break
            # 将头部和尾部都处理好的截断文本存入content_cut_list
            content_cut_list.append(cut_content)
            # 针对尾部文本截断长度为140-150以及满足尾部合并阈值的文本
            # 进行重叠截断进行特殊处理
            if cont_length - tail_idx <= tail_merge_value:
                break
        
        return content_cut_list

    # 全文本数据清洗
    def content_clear_func(self, content):
        # 文本清洗
        content_clear = self.clear_func(content)
        # 去除文本中的空格以及空字符串
        content_clear = re.sub(r',+', ',', re.sub(r'[\s_]', '', content_clear))

        # 去除题目开头"【题文】(多选)/(..分)"
        content_clear = re.sub(r'\[题文\]', '', content_clear)
        content_clear = re.sub(r'(\([单多]选\)|\[[单多]选\])', '', content_clear)
        content_clear = re.sub(r'(\(\d{1,2}分\)|\[\d{1,2}分\])', '', content_clear)
        # 将文本中的选项"A.B.C.D."改为";"
        content_clear = re.sub(r'[ABCD]\.', ';', content_clear)
        # # 若选项中只有1,2,3或(1)(2)(3),或者只有标点符号,则过滤该选项
        # content_clear = re.sub(r'(\(\d\)[、,;\.]?)+\(\d\)|\d[、,;]+\d', '', content_clear)
        # 去除题目开头(...年...[中模月]考)文本
        head_search = re.search(r'^(\(.*?[\)\]]?\)|\[.*?[\)\]]?\])', content_clear)
        if head_search is not None and 5 < head_search.span(0)[1] < 40:
            head_value = content_clear[head_search.span(0)[0]+1:head_search.span(0)[1]-1]
            if re.search(r'.*?(\d{2}|[模检测训练考试验期省市县外第初高中学]).*?[模检测训练考试验期省市县外第初高中学].*?', head_value):
                content_clear = content_clear[head_search.span(0)[1]:].lstrip()
        # 对于只有图片格式以及标点符号的信息进行特殊处理(去除标点符号/空格/连接符)
        if re.sub(r'[\.、。,;\:\?!#\-> ]+', '', content_clear) == '':
            content_clear = ''

        return content_clear

    # 数据清洗与长文本重叠截取处理
    def content_clear_process(self, data):
        # 初始化content_clear
        content_clear = ''
        # 全文本数据清洗
        if "quesBody" in data:
            content_clear = self.content_clear_func(data["quesBody"])
        elif "stem" in data:
            content_clear = self.content_clear_func(data["stem"])
        
        # 重叠截取长文本用于进行Sentence-Bert训练
        content_cut_list = self.truncate_func(content_clear)
        
        return content_clear, content_cut_list


if __name__ == "__main__":
    # 获取mongodb数据
    mongo_coll = config.mongo_coll

    test_data = {
        'quesBody': """【题文】某同学设计了如下的电路测量电压表内阻，<i style=\"font-family: Times New Roman;\">R</i>为能够满足实验条件的滑动变阻器，<img src=\"Upload/QBM/be06c18fe93021f9c1f90227bd169e1b.png\"mathml=\"PG1hdGg+PG1yb3c+PG1zdXA+PG1pPlI8L21pPjxtbz7igLI8L21vPjwvbXN1cD48L21yb3c+PC9tYXRoPg==\"latex=\"${{R}^{\\prime }}$\"style=\"vertical-align:middle;\">为电阻箱，电压表量程合适。实验的粗略步骤如下：<br/><img src=\"Upload/QBM/f9db6da2-ddcd-422c-b87e-3481c242ff66.png\" style=\"vertical-align:middle;\" alt=\"\" width=\"164px\" height=\"198px\"><br  /><br/>①闭合开关S<sub >1</sub>、S<sub >2</sub>，调节滑动变阻器<i style=\"font-family: Times New Roman;\">R</i>，使电压表指针指向满刻度的<img src=\"Upload/QBM/bf31876698721a199c7c53c6b320aa86.png\"mathml=\"PG1hdGg+PG1yb3c+PG1mcmFjPjxtbj4yPC9tbj48bW4+MzwvbW4+PC9tZnJhYz48L21yb3c+PC9tYXRoPg==\"latex=\"$\\frac{2}{3}$\"style=\"vertical-align:middle;\">处；<br/>②断开开关S<sub >2</sub>，调节某些仪器，使电压表指针指向满刻度的<img src=\"Upload/QBM/4dac452fbb5ef6dd653e7fbbef639484.png\"mathml=\"PG1hdGg+PG1yb3c+PG1mcmFjPjxtbj4xPC9tbj48bW4+MzwvbW4+PC9tZnJhYz48L21yb3c+PC9tYXRoPg==\"latex=\"$\\frac{1}{3}$\"style=\"vertical-align:middle;\">处；<br/>③读出电阻箱的阻值，该阻值即为电压表内阻的测量值；<br/>④断开开关S<sub >1</sub>、S<sub >2</sub>拆下实验仪器，整理器材。<br/>（1）上述实验步骤②中，调节某些仪器时，正确的操作是<bk size=\"10\" index=\"1\" type=\"underline\">__________</bk><br/>A.保持电阻箱阻值<img src=\"Upload/QBM/be06c18fe93021f9c1f90227bd169e1b.png\"mathml=\"PG1hdGg+PG1yb3c+PG1zdXA+PG1pPlI8L21pPjxtbz7igLI8L21vPjwvbXN1cD48L21yb3c+PC9tYXRoPg==\"latex=\"${{R}^{\\prime }}$\"style=\"vertical-align:middle;\">不变，调节滑动变阻器的滑片，使电压表指针指向满刻度的<img src=\"Upload/QBM/4dac452fbb5ef6dd653e7fbbef639484.png\"mathml=\"PG1hdGg+PG1yb3c+PG1mcmFjPjxtbj4xPC9tbj48bW4+MzwvbW4+PC9tZnJhYz48L21yb3c+PC9tYXRoPg==\"latex=\"$\\frac{1}{3}$\"style=\"vertical-align:middle;\">处<br/>B.保持滑动变阻器的滑片位置不变，调节电阻箱阻值<img src=\"Upload/QBM/be06c18fe93021f9c1f90227bd169e1b.png\"mathml=\"PG1hdGg+PG1yb3c+PG1zdXA+PG1pPlI8L21pPjxtbz7igLI8L21vPjwvbXN1cD48L21yb3c+PC9tYXRoPg==\"latex=\"${{R}^{\\prime }}$\"style=\"vertical-align:middle;\">，使电压表指针指向满刻度的<img src=\"Upload/QBM/4dac452fbb5ef6dd653e7fbbef639484.png\"mathml=\"PG1hdGg+PG1yb3c+PG1mcmFjPjxtbj4xPC9tbj48bW4+MzwvbW4+PC9tZnJhYz48L21yb3c+PC9tYXRoPg==\"latex=\"$\\frac{1}{3}$\"style=\"vertical-align:middle;\">处<br/>C.同时调节滑动变阻器和电阻箱的阻值，使电压表指针指向满刻度的<img src=\"Upload/QBM/4dac452fbb5ef6dd653e7fbbef639484.png\"mathml=\"PG1hdGg+PG1yb3c+PG1mcmFjPjxtbj4xPC9tbj48bW4+MzwvbW4+PC9tZnJhYz48L21yb3c+PC9tYXRoPg==\"latex=\"$\\frac{1}{3}$\"style=\"vertical-align:middle;\">处<br/>（2）此实验电压表内阻的测量值与真实值相比<bk size=\"8\" index=\"2\" type=\"underline\">________</bk>（选填“偏大”“偏小”或“相等”）；<br/>（3）如实验测得该电压表内阻为8500Ω，要将其量程扩大为原来的<img src=\"Upload/QBM/5c55e4f3eda94bc505f103b10bc1fee7.png\"mathml=\"PG1hdGg+PG1yb3c+PG1mcmFjPjxtbj42PC9tbj48bW4+NTwvbW4+PC9tZnJhYz48L21yb3c+PC9tYXRoPg==\"latex=\"$\\frac{6}{5}$\"style=\"vertical-align:middle;\">倍，需串联<bk size=\"5\" index=\"3\" type=\"underline\">_____</bk>Ω的电阻。""", 
        'option': ['$\\left\\{-2,0\\right\\}$', '$\\left\\{-2,0,2\\right\\}$', '$\\left\\{-1,1,2\\right\\}$', '$\\left\\{-1,0,2\\right\\}$']}
    dpp = DataPreProcessing(mongo_coll)

    string = """如图三角形的每个顶点均在格点上，且每个小正方形的边长为1.<br/><img src="http://tkimgs.zhixinhuixue.net/image/word/2021/09/05/1630825213599903.png" width="197px" height="180px" /><br/>(1)<img src="http://tkimgs.zhixinhuixue.net/image/word/2021/09/05/1630825213498556.png" data-latex="${\angle 1+\angle 2+\angle 3=}$" width="118",height="12" />________<img src="http://tkimgs.zhixinhuixue.net/image/word/2021/09/05/1630825213387699.png" data-latex="${^{\circ } }$" width="5",height="5" />；<br/>(2)求<img src="http://tkimgs.zhixinhuixue.net/image/word/2021/09/05/1630825213446366.png" data-latex="${\triangle ABC}$" width="54",height="11" />的面积．"""
    string = """已知c水=4.2×103J/(kg·℃),求"""
    res = dpp.clear_func(string)
    print(res)

    # res = dpp.content_clear_process(test_data)
    # print(res[0])

    # print(dpp.content_clear_process(mongo_coll.find_one({}))[0])
    # print(dpp(test_data,is_retrieve=True))