We propose a feature extraction method based on the Kmeans algorithm based on the text characteristics in the English translation corpus. The article first uses a sparse autoencoder unsupervised learning method to reduce dimensionality. It then uses the Kmeans clustering algorithm for text clustering. The experimental results prove that the text features extracted by the sparse autoencoder based on the Kmeans algorithm can be used for English translation corpus knowledge clustering to achieve automatic integration. And this method can effectively solve the problems of high-dimensional, sparse, and noisy texts in the English translation corpus. The algorithm mentioned in the article can significantly improve the accuracy of the clustering results.

#### Keywords

- Kmeans algorithm
- Deep learning
- English translation
- Feature extraction
- Corpus
- Automated integration

#### MSC 2010

- 26E60

People's exploration of the general characteristics of the translated text and the translation process has gone through the following stages: empirical research on the translation process-introspection of vocal thinking-Translog-comprehensive induction, and deduction. This laid a methodological foundation for the later establishment of a translation corpus to analyze the characteristics of the translation. The advocacy and development of descriptive research methods by polysystem theorists and Mona Baker's systematic research on the general characteristics of translation led to the birth of the translated English corpus. Because of people's thinking, the divergence of the divergence, and the randomness of the publishing method, the structure of the short text in English translation is extremely inconsistent. The information provided by a single short text is very limited [1]. There is a problem of high sparseness when processing a large amount of short text. Effectively organizing and analyzing the massive, irregular, and sparse short texts in English translation has become a challenging research hotspot. Aiming at the problem of feature extraction and clustering of English translation short texts, we use the idea of deep learning to conduct research. The article uses automated encoder processing technology and the Kmeans algorithm to extract hidden features in short texts. In this way, more accurate English translation short text clustering results can be obtained.

The basic idea of the Sparse Automatic Encoding (DSAE) text clustering algorithm is to use the automatic encoding process of deep learning [2]. This part also includes the regularization process and the noise-adding process. The algorithm flow is shown in Figure 1.

After the short text is cleaned and segmented, the word bag that constitutes these short texts is obtained [3]. The performance is as follows:
_{i}_{i}_{i}

The basic autoencoder accepts an input vector

Minimize the loss caused by reconstruction to obtain the optimal parameters ^{*} and ^{*} as equation (4). The loss function used in this paper is the Kullback-Leibler divergence as equation (5).

The autoencoder uses the classic stochastic gradient descent algorithm for training. In each iteration process, use equation (6) to update the weight matrix:

Where

The powerful nonlinear expression ability fully describes the unique characteristics of individual objects. The structure of short texts is quite different and has many unique features. If the autoencoder algorithm is used directly, the final extracted feature vector will not reflect the public distribution characteristics of the short text [4]. This article restricts the learning ability of the autoencoder.

This paper adopts this idea and uses the absolute value function as a penalty term to compress the coefficients of the autoencoder. In this way, the coefficients with smaller absolute values are automatically compressed to 0 to ensure the sparsity of the parameters. This can avoid over-learning insignificant features in short texts. We adjust formula (5) to formula (7) and (8) to calculate.

The autoencoder can get a better feature extraction effect when the output layer dimension is greater than or equal to the input layer dimension. It will directly copy the sparse input vector and output it to the decoder. In this way, the purpose of extracting abstract features in short texts cannot be achieved.

In response to these problems, the method adopted in this paper is to add a certain amount of noise to the short text vector and then input it into the encoder for training. On the one hand, this paper selects part of the data to be forced to 0; on the other hand, it also randomly selects a certain percentage of data to be forced to 1. The former considers that there may be some missing data in the high-dimensional input vector, and the trained autoencoder should be able to restore these missing features [5]. The latter is to take into account the irregularity of the input of the English translation corpus, so no one can guarantee that the model avoids the influence of personalized or irrelevant input. After adding noise, the input vector

We superimpose multiple noisy sparse autoencoders to form a deep learning network. In the training process, the input of the

After the above-mentioned auto-encoder processing and the regularization and noise addition process, the short text low-dimensional feature vector is obtained. This lays the foundation for further text mining. This article applies the above results to the cluster analysis of short texts and discusses its impact on the clustering effect.

K-means algorithm is a simple and efficient data clustering algorithm, which is widely used in text clustering. This paper uses the K-means algorithm to randomly select

This article selects more representative English translation corpus data as the analysis object. At the same time, we use the short text clustering algorithm based on deep noise sparse autoencoder for unsupervised learning [8]. Then it is compared with the results of manual annotation and existing similar research to verify the algorithm's effectiveness. The data comes from the English translation corpus on the big data sharing platform-Datang.

This paper uses Entropy and Precision to evaluate the effectiveness of the algorithm. Entropy measures the purity of a clustering result. The smaller the value, the higher the purity of the cluster. The calculation method of Entropy is shown in equations (10) and (11):

Where _{i}_{i}_{i}_{j}

Precision measures the accuracy of the clustering results. The larger the value, the higher the quality of the clustering. It assumes that the largest number of actual class IDs in each cluster class is the ID of the cluster class, so the Precision of each cluster class is equal to the proportion of the largest actual class ID. As shown in formula (12):

The total Precision of the clustering results is the weighted average of all cluster Precision:

We preprocess the data in the English translation corpus. Because the links in the English translation are all automatically generated short links, these are not helpful to the analysis of the English translation content. However, the English translations of machine users often deliberately add more irrelevant links. So we are here to remove the short link string and only keep the “HTTP” keyword. Then we use the common Chinese typos to replace the wrong words in the English translation. Finally, we use the NLPIR2014 Chinese word segmentation system to segment the cleaned-up English translation [9]. Combining the English translation content characteristics, establish a stop word list and remove the stop words in the word segmentation results to obtain the English translation corpus data word bag.

The experiment is divided into 4 parts: We directly cluster the text feature vectors. We use Wikipedia entry content to expand the text feature vector before clustering. The feature vector is constructed based on introducing the semantic dictionary and merging similar words, and then the clustering is carried out. We use the method of this paper (that is, after the deep noise sparse auto-encoder processing) before clustering. The clustering methods all use the K-Means algorithm.

The result of word segmentation is 17,171 different vocabularies. We conducted word frequency statistics and found that 6698 words appeared only once. This is of little significance for analyzing the similarity between short texts. The first 5000 words can fully reflect the content of the short text, and more words will not influence the experimental results. Therefore, this experiment also selects the first 5000 words as the feature set of each English translation. According to the method described above, the corresponding space vector is established, and then the K-Means algorithm is used for clustering directly.

We first use the method of Wikipedia entry content to expand the text feature vector. The article downloads the Chinese version of the Wikipedia library released on August 23, 2020, from Wikipedia and imports it into the Mysql database. Then use Lucene to create an index of Wikipedia content. There is no space between Chinese words as natural delimiters. If you put the entire short text directly in Wikipedia, you often won’t get any query results. We search for each word in each English translation word bag as a keyword to obtain a Wikipedia document for expanding information [10]. The article combines the word segmentation result of the document with the original English translation bag of words. At the same time, we use the information gain value index to sort. Take the first 5000 words as the feature set of each English translation and build a space vector. Finally, we use K-Means for clustering.

The process of the deep noise sparse autoencoder method proposed in this paper is as follows: We use the Python-based Theano library to implement. As the number of hidden layers of deep learning increases, the time spent training will increase rapidly. After many debugging, this experiment selects a deep learning structure with three hidden layers. The number of nodes is 5000, 3000, and 1000, respectively. When the set 0 and 1 parameters are too large, the autoencoder will have a very high error due to too much information missing. In addition, experiments found that setting 0 and 1 can achieve better results when decreasing layer by layer. The parameter set to 1 should not be too large. In the end, the probability of adding 0 noise selected in this experiment is 0.3, 0.2, and 0.1, and the probability of adding 1 noise is 0.03, 0.02, and 0.01, respectively. The penalty term coefficient of the L1 normal form regularization tested in the experiment has 10^{−1}, 10^{−2}, K, 10^{−8}. Among them, 10^{−4} it performs best. When training the model, the random gradient descent, the selection of the algorithm learning rate is also very important. If the learning rate is too large, it is easy to cause the model to converge to the optimal local solution. Too small will make the training time too long. This experiment also tested 8 different parameters, such as 10^{−1}, 10^{−2}, K, 10^{−8}, and finally found that the result of learning rate 10^{−2} is the best.

The clustering results obtained by the above four methods are shown in Tables 1 to 4, and the corresponding information entropy and accuracy are shown in Figures 4 and 5. Kmeans represent the unprocessed result. Wiki+K-Means represents the result of Wikipedia expansion. Cilin+K-Means represents the result of introducing the synonym word forest. DSAE+K-means represents the result processed by the deep noise sparse autoencoder. Combining information entropy and accuracy of the two measurement standards, we can see that the effects of the four methods are ranked from low to high. The order is K-means, Wiki+K-Means, Cilin+K-Means, and DSAE+K-means.

K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 777 | 301 | 286 |

Cluster 2 | 364 | 1072 | 348 |

Cluster 3 | 359 | 127 | 866 |

Wiki+K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 926 | 233 | 237 |

Cluster 2 | 384 | 1026 | 167 |

Cluster 3 | 190 | 241 | 1096 |

Cilin+K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 1120 | 192 | 194 |

Cluster 2 | 134 | 1278 | 207 |

Cluster 3 | 246 | 30 | 1099 |

DSAE+K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 1317 | 64 | 103 |

Cluster 2 | 23 | 1433 | 225 |

Cluster 3 | 160 | 3 | 1172 |

It can be seen from the experimental results that the effect of directly using K-Means is the worst. Its comprehensive information entropy is 0.457, and its weighted accuracy rate is only 61.4%. This shows that the high-dimensional and sparse characteristics of short text greatly influence the traditional space vector method, which makes it lose the value of practical application [11]. The method of Wiki+K-Means is only slightly better than K-Means. The main reason is that the short text data used in the previous experiments are all news, and when using vocabulary, English translation is more casual and changeable than news. When using Wikipedia to expand the information of words in English translation, some words can accurately find the corresponding entries. But for the other two types of English translation, if we use Wikipedia's expansion method, it may be that the part of the entry information found is quite different from the content that the author wants to reflect, so the clustering effect cannot be improved. The overall clustering effect of Cilin+K-Means is not bad. This shows that using synonyms for word frequency merging to achieve dimensionality reduction of short text vectors is more effective. This makes the clustering effect impossible to achieve the best. On the other hand, it has higher requirements for thesaurus, and unregistered words will have a greater impact on the method. DSAE+K-Means achieved the best results among several methods, with a comprehensive information entropy of 0.207 and a complete accuracy of 87.8%. The purity of the clustering results is the highest, and the accuracy is also the best. This shows that the deep noise sparse autoencoder can use its nonlinear characteristics to learn low-dimensional abstract features from high-dimensional underlying features. This can dig out the essence of the short text space vector and significantly improve clustering performance.

This paper proposes a deep noise sparse autoencoder algorithm based on the high-dimensional and sparse characteristics of the English translation corpus space vector. We add regularization of the L1 paradigm to avoid overfitting and control sparsity. At the same time, we add 0 and 1 noise to the input data. This effectively extracts the essential features of the data while reducing the dimension of the short text space vector. It achieves a good clustering effect in the cluster analysis of short texts.

#### DSAE+K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 1317 | 64 | 103 |

Cluster 2 | 23 | 1433 | 225 |

Cluster 3 | 160 | 3 | 1172 |

#### Cilin+K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 1120 | 192 | 194 |

Cluster 2 | 134 | 1278 | 207 |

Cluster 3 | 246 | 30 | 1099 |

#### K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 777 | 301 | 286 |

Cluster 2 | 364 | 1072 | 348 |

Cluster 3 | 359 | 127 | 866 |

#### Wiki+K-means clustering results

Clustering result | IT | Finance | Healthy |
---|---|---|---|

Cluster 1 | 926 | 233 | 237 |

Cluster 2 | 384 | 1026 | 167 |

Cluster 3 | 190 | 241 | 1096 |

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