matching_dependency/md_discovery/tmp_discover.py

import multiprocessing
import time
from concurrent.futures import ProcessPoolExecutor
from multiprocessing.managers import SharedMemoryManager

import numpy as np
import pandas as pd
import copy

import torch
from tqdm import tqdm

from settings import model, md_output_dir, confidence_threshold


def is_minimal(md, md_list, target_col):
    # 假设这个md是minimal
    if len(md_list) == 0:
        return True
    minimal = True
    for _ in md_list:
        if _ != md:
            other_cols = list(set(_.keys()) - {target_col})
            # 假设列表中每一个md都使当前md不minimal
            exist = True
            # 如果左边任何一个大于，则假设不成立
            for col in other_cols:
                if _[col] > md[col]:
                    exist = False
                    break
            # 如果右边小于，假设也不成立
            if _[target_col] < md[target_col]:
                exist = False
            # 任何一次假设成立，当前md不minimal
            if exist:
                minimal = False
                break
    return minimal


def pairs_inference(path, threshold, target_col):
    data = pd.read_csv(path, low_memory=False, encoding='ISO-8859-1')
    data.fillna("", inplace=True)
    data = data.astype(str)
    columns = data.columns.values.tolist()
    target_index = columns.index(target_col)
    cols_but_target = list(set(columns) - {target_col})
    length = data.shape[0]
    width = data.shape[1]

    sentences = []
    for col in range(0, width):
        for row in range(0, length):
            cell_value = data.values[row, col]
            sentences.append(cell_value)
    embedding = model.encode(sentences, convert_to_tensor=True, device="cuda")
    split_embedding = torch.split(embedding, length, dim=0)
    table_tensor = torch.stack(split_embedding, dim=0, out=None)
    norm_table_tensor = torch.nn.functional.normalize(table_tensor, dim=2)
    sim_tensor = torch.matmul(norm_table_tensor, norm_table_tensor.transpose(1, 2))

    torch.save(sim_tensor, md_output_dir + "tensor.pt")

    md_list = []
    minimal_vio = []
    init_md = {}
    for col in columns:
        init_md[col] = 1 if col == target_col else 0
    md_list.append(init_md)

    for row1 in range(0, length - 1):
        terminate = False
        for row2 in range(row1 + 1, length):
            violated_mds = []
            # sims是两行的相似度
            sims = {}
            for col_index in range(0, width):
                col = columns[col_index]
                similarity = sim_tensor[col_index, row1, row2].item()
                sims[col] = similarity

            # 寻找violated md,从md列表中删除并加入vio列表
            for md in md_list[:]:
                lhs_satis = True
                rhs_satis = True
                for col in cols_but_target:
                    if sims[col] < md[col]:
                        lhs_satis = False
                        break
                if sims[target_col] < md[target_col]:
                    rhs_satis = False
                if lhs_satis == True and rhs_satis == False:
                    md_list.remove(md)
                    violated_mds.append(md)

            for vio_md in violated_mds:
                # 特殊化左侧
                for col in cols_but_target:
                    if sims[col] + 0.01 <= 1:
                        spec_l_md = copy.deepcopy(vio_md)
                        spec_l_md[col] = threshold if sims[col] < threshold else sims[col] + 0.01
                        if is_minimal(spec_l_md, md_list, target_col):
                            md_list.append(spec_l_md)
                if vio_md not in minimal_vio:
                    minimal_vio.append(vio_md)
            if len(md_list) == 0:
                terminate = True
                break
        if terminate:
            break
    if len(md_list) > 0:
        for vio in minimal_vio[:]:
            if not is_minimal(vio, md_list, target_col):
                minimal_vio.remove(vio)

    print('mds_list\t', len(md_list), '\n')
    print('vio_list\t', len(minimal_vio), '\n')

    if len(minimal_vio) == 0:
        return md_list, []

    remove_list = []
    # fuck = []
    for md in minimal_vio:
        support, confidence = get_metrics(md, data, sim_tensor, target_col, target_index)
        # fuck.append((support, confidence))
        if support < 1:
            print('delete by support')
            remove_list.append(md)
        if confidence < confidence_threshold:
            print('delete by confidence')
            remove_list.append(md)
    # fuck_me = sorted(fuck, key=lambda x: x[1], reverse=True)
    for _ in remove_list:
        minimal_vio.remove(_)

    for _ in minimal_vio[:]:
        if not is_minimal(_, minimal_vio, target_col):
            minimal_vio.remove(_)

    print('\033[31m' + 'vio_length\t' + str(len(minimal_vio)) + '\033[0m')

    return md_list, minimal_vio


def get_metrics(current_md, data, sim_tensor, target_col, target_index):
    columns = data.columns.values.tolist()
    length = data.shape[0]
    width = data.shape[1]

    md_tensor = list(current_md.values())
    md_tensor = torch.tensor(md_tensor, device='cuda')
    md_tensor_2d = md_tensor.unsqueeze(1)
    md_tensor_3d = md_tensor_2d.unsqueeze(2)
    md_tensor_3d = md_tensor_3d.repeat(1, length, length)

    sup_tensor = torch.ge(sim_tensor, md_tensor_3d)
    ini_slice = torch.ones((length, length), dtype=torch.bool, device='cuda')
    for i in range(0, width):
        if i != target_index:
            sup_tensor_slice = sup_tensor[i]
            ini_slice = torch.logical_and(ini_slice, sup_tensor_slice)
    sup_tensor_int = ini_slice.int()
    support = torch.count_nonzero(sup_tensor_int).item()

    ini_slice = torch.logical_and(ini_slice, sup_tensor[target_index])
    conf_tensor_int = ini_slice.int()
    confidence_numerator = torch.count_nonzero(conf_tensor_int).item()
    confidence = confidence_numerator / support

    return support, confidence