如何在基于无监督方面的情感分析中进行主题检测

Question

我想使用 Python 制作一个 ABSA，从在线评论中分析预定义方面（例如交付、质量、服务）的情绪。我想在无人监督的情况下进行，因为这将使我免于手动标记评论，并且我可以分析更多评论数据（查看大约 10 万条评论）。因此，我的数据集仅包含评论，没有评分。我想有一个模型，可以首先检测方面类别，然后分配情感极性。例如。当评论说“发货顺利，但产品损坏”时，我希望模型将“发货”一词分配给“交付”方面的类别，而“顺利”与积极情绪相关。

我已经寻找了可以采取的方法，我想知道是否有人有这方面的经验并可以指导我找到可以帮助我的方向。将不胜感激！

Answer 1

基于方面的情感分析 (ABSA)，其中任务首先 提取实体的方面或特征（即方面术语提取 或 ATE1 ) 从给定的文本中，然后确定情绪 极性（SP），如果有的话，朝向该实体的每个方面。这 ABSA 的重要性导致了 ABSA 任务的创建

B-LSTM 和 CRF 分类器将用于特征提取和方面 监督和非监督 ATE 的术语检测。

https://www.researchgate.net/profile/Andreea_Hossmann/publication/319875533_Unsupervised_Aspect_Term_Extraction_with_B-LSTM_and_CRF_using_Automatically_Labelled_Datasets/links/5a3436a70f7e9b10d842b0eb/Unsupervised-Aspect-Term-Extraction-with-B-LSTM-and-CRF-using-Automatically-Labelled-Datasets.pdf

https://github.com/songyouwei/ABSA-PyTorch/blob/master/infer_example.py

# -*- coding: utf-8 -*-
# file: infer.py
# author: songyouwei <youwei0314@gmail.com>
# Copyright (C) 2019. All Rights Reserved.

import torch
import torch.nn.functional as F
import argparse

from data_utils import build_tokenizer, build_embedding_matrix
from models import IAN, MemNet, ATAE_LSTM, AOA


class Inferer:
    """A simple inference example"""
    def __init__(self, opt):
        self.opt = opt
        self.tokenizer = build_tokenizer(
            fnames=[opt.dataset_file['train'], opt.dataset_file['test']],
            max_seq_len=opt.max_seq_len,
            dat_fname='{0}_tokenizer.dat'.format(opt.dataset))
        embedding_matrix = build_embedding_matrix(
            word2idx=self.tokenizer.word2idx,
            embed_dim=opt.embed_dim,
            dat_fname='{0}_{1}_embedding_matrix.dat'.format(str(opt.embed_dim), opt.dataset))
        self.model = opt.model_class(embedding_matrix, opt)
        print('loading model {0} ...'.format(opt.model_name))
        self.model.load_state_dict(torch.load(opt.state_dict_path))
        self.model = self.model.to(opt.device)
        # switch model to evaluation mode
        self.model.eval()
        torch.autograd.set_grad_enabled(False)

    def evaluate(self, raw_texts):
        context_seqs = [self.tokenizer.text_to_sequence(raw_text.lower().strip()) for raw_text in raw_texts]
        aspect_seqs = [self.tokenizer.text_to_sequence('null')] * len(raw_texts)
        context_indices = torch.tensor(context_seqs, dtype=torch.int64).to(self.opt.device)
        aspect_indices = torch.tensor(aspect_seqs, dtype=torch.int64).to(self.opt.device)

        t_inputs = [context_indices, aspect_indices]
        t_outputs = self.model(t_inputs)

        t_probs = F.softmax(t_outputs, dim=-1).cpu().numpy()
        return t_probs


if __name__ == '__main__':
    model_classes = {
        'atae_lstm': ATAE_LSTM,
        'ian': IAN,
        'memnet': MemNet,
        'aoa': AOA,
    }
    # set your trained models here
    model_state_dict_paths = {
        'atae_lstm': 'state_dict/atae_lstm_restaurant_acc0.7786',
        'ian': 'state_dict/ian_restaurant_acc0.7911',
        'memnet': 'state_dict/memnet_restaurant_acc0.7911',
        'aoa': 'state_dict/aoa_restaurant_acc0.8063',
    }
    class Option(object): pass
    opt = Option()
    opt.model_name = 'ian'
    opt.model_class = model_classes[opt.model_name]
    opt.dataset = 'restaurant'
    opt.dataset_file = {
        'train': './datasets/semeval14/Restaurants_Train.xml.seg',
        'test': './datasets/semeval14/Restaurants_Test_Gold.xml.seg'
    }
    opt.state_dict_path = model_state_dict_paths[opt.model_name]
    opt.embed_dim = 300
    opt.hidden_dim = 300
    opt.max_seq_len = 80
    opt.polarities_dim = 3
    opt.hops = 3
    opt.device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')

    inf = Inferer(opt)
    t_probs = inf.evaluate(['happy memory', 'the service is terrible', 'just normal food'])
    print(t_probs.argmax(axis=-1) - 1)