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Hybrid topic modeling method based on dirichlet multinomial mixture and fuzzy match algorithm for short text clustering

Journal of Big Data volume 11, Article number: 68 (2024) Cite this article

Abstract

Topic modeling methods proved to be effective for inferring latent topics from short texts. Dealing with short texts is challenging yet helpful for many real-world applications, due to the sparse terms in the text and the high dimensionality representation. Most of the topic modeling methods require the number of topics to be defined earlier. Similarly, methods based on Dirichlet Multinomial Mixture (DMM) involve the maximum possible number of topics before execution which is hard to determine due to topic uncertainty, and many noises exist in the dataset. Hence, a new approach called the Topic Clustering algorithm based on Levenshtein Distance (TCLD) is introduced in this paper, TCLD combines DMM models and the Fuzzy matching algorithm to address two key challenges in topic modeling: (a) The outlier problem in topic modeling methods. (b) The problem of determining the optimal number of topics. TCLD uses the initial clustered topics generated by DMM models and then evaluates the semantic relationships between documents using Levenshtein Distance. Subsequently, it determines whether to keep the document in the same cluster, relocate it to another cluster, or mark it as an outlier. The results demonstrate the efficiency of the proposed approach across six English benchmark datasets, in comparison to seven topic modeling approaches, with 83% improvement in purity and 67% enhancement in Normalized Mutual Information (NMI) across all datasets. The proposed method was also applied to a collected Arabic tweet and the results showed that only 12% of the Arabic short texts were incorrectly clustered, according to human inspection.

Introduction

Topic modeling methods have become very effective in finding hidden semantics and latent patterns in textual data [1,2,3,4]. With the rise of social media, clustering the short text tracked the researcher’s attention to using topic modeling methods for extracting semantic subjects. The main challenges of clustering the short text are fewer word co-occurrence, sparseness problems, a limited number of words in each text, and difficulty in finding semantically related words [5].

Several model-based clustering methods have been proposed to address these challenges, demonstrating effective performance in handling issues associated with short text data [6]. Among the frequently employed methods for text clustering is Latent Dirichlet Allocation (LDA) [7,8,9]. Short text topic modeling methods are categorized into three groups based on their characteristics [5]: (i) Global Word Co-occurrences (GWC), (ii) Self-aggregation-based Methods (SA), and (iii) the Dirichlet Multinomial Mixture (DMM). GWC-based methods consider the closer two words to each other to be more relevant [10]. GWC finds the global word co-occurrences from the original corpus to predict the latent topics. While SA combines the short texts into long pseudo-documents to solve the sparseness problem [11].

Nigam et al. [12] proposed the Dirichlet Multinomial Mixture Model (DMM) based on the Expectation-Maximization method, assuming each text belongs to one topic. The success of DMM motivated Yu et al. [13] to incorporate DMM with feature selection. However, the proposed method showed a slow convergence. The authors in [9] proposed a DMM model with feature partition. Moreover, the Gibbs Sampling method is proposed based on DMM (GSDMM) for short text clustering [14], GSDMM needs the maximum number of possible clusters (k) to find the optimal number of clusters [5]. The main drawback of this method is the high computational cost (space and time) when assigning a high number to parameter k.

The aforementioned kind of unsupervised statistical learning is typically thought to work well, but only if the corpus is statistically enough. Short texts have sparse terms and noises [15, 16], rendering them insufficient data necessary for successful statistical learning [17]. In addition, determining the number of topics before execution is challenging since the number of topics in real cases is unknown [18]. Determining a large number of topics usually increases the complexity of the model and leads to unsatisfactory results [19]. So each text can be represented by a separate topic due to the very limited available word co-occurrence in short texts [20].

One of the interesting algorithms is the fuzzy matching algorithm (e.g., Levenshtein distance), which is characterized by its ability to match sentences to find the distances between a single text and other texts [21, 22]. In the work presented in [23], a fuzzy matching approach was proposed for data alignment by employing the Levenshtein distance and N-grams for string matching, especially when there is no exact match. Although the main problem of the fuzzy matching algorithm is the high computational complexity, particularly when large samples are presented in the dataset [24], the authors in [18] suggested a technique that uses a similarity metric that integrates syntactic and semantic information from the text, where the Levenshtein distance is used to measure how similar the feature vectors are to one another.

In this paper, a hybrid approach called Topic Clustering based on Levenshtein Distance (TCLD) algorithm is proposed, which effectively addresses the limitations associated with both topic modeling and fuzzy matching techniques. TCLD aims to optimize the number of topics generated through topic modeling, enhance the results of topic modeling, and improve the complexity of both topic modeling and Levenshtein distance calculations.

In addition, the majority of short text modeling efforts have been made for the English language. On the other hand, research on the Arabic language is limited and facing significant problems. However, most of the research on the Arabic language is utilized for sentiment analysis [25]. The work by [26] has combined the k-means and topic modeling for Arabic document clustering where a data set for Arabic classification [27, 28] was used (Not a short text dataset). Collecting Arabic data from social media produced huge short texts with spelling errors, homonyms, repeated text, and even some words that have different spellings, which makes it hard to find the latent topics from the short text data [29,30,31]. Therefore, the proposed method is tested using collected tweets based on specific geographic locations to validate this work. Since the Arabic language is challenging and there is no available dataset for short-text modeling, a new short-text Arabic dataset is established for short-text modeling.

The main contributions of this work can be summarized as follows:

  1. 1.

    Introducing a novel method that treats individual texts as singular units and compares them with others through a partial match involving more than one word from the same text.

  2. 2.

    Introducing a novel hybrid approach, Topic Clustering based on Levenshtein Distance (TCLD), aimed at optimizing the number of topics generated through topic modeling. The developed TCLD algorithm evaluates documents within topics and ensures accurate document placement within clusters.

  3. 3.

    Improving the efficacy of topic modeling methods by addressing their challenges in dealing with short texts, optimizing the topic count, and managing noisy data.

  4. 4.

    Establishing a standardized Arabic dataset by integrating the TCLD algorithm and manual annotation, thereby supporting research in short text topic modeling within the Arabic language context.

Two intrinsic/internal measures and four extrinsic/external measures are used to measure the effectiveness of the proposed method. To demonstrate the effectiveness of the proposed method, six English benchmark short-text datasets [5] were tested. Additionally, a case study on collected Arabic tweets has been performed as a challenging task to confirm the ability of the proposed method to deal with messy and unstructured data. The results show that the proposed method was able to produce good results on benchmark English datasets compared with state-of-the-art topic modeling techniques, such as LDA, Gibbs Sampling DMM (GSDMM), Latent-Feature Dirichlet Multinomial Model (LF-DMM), Biterm Topic Modeling (BTM), Generalized Polya Urn DMM (GPU-DMM), Pseudo-Document-Based Topic Modeling (PTM), and Self-Aggregation based Topic Modeling (SATM), with 83% improvement on overall datasets in terms of purity and 67% in term of NMI. The Arabic dataset shows only 12% of the short texts are miss-clustered based on manual checking.

The remainder of the paper is organized as follows: Sect. 2 presents a detailed literature review, followed by Methods and Materials in Sect. 3. The results and discussion are presented in Sect. 4. Finally, the paper concludes with Sect. 5.

Literature review

Clustering may be used to find the hidden patterns in complicated datasets that are exposed by several data points. Many clustering techniques have been developed for a range of applications [32,33,34,35]. Text clustering is an important problem in the field of natural language processing [36]. Clustering short texts is challenging due to the extremely low amount of word co-occurrence within such texts [20], this poses difficulties when employing the traditional topic modeling algorithms, such as probabilistic latent semantic analysis (PLSA) and Latent Dirichlet Allocation (LDA) [37], as these algorithms were primarily designed for long texts [5].

Model-based clustering algorithms stand out as the most effective approach for short-text clustering [6]. Among these is the Gaussian Mixture Model(GMM) [38]. GMM considers the features in data to be produced by a Gaussian distribution mixture, where each cluster is related to an exact Gaussian distribution. However, when applied to short text, GMM encounters challenges stemming from the inherent high dimensionality of text data [39]. Addressing this issue, Nigam et al. [12] introduced the Dirichlet Multinomial Mixture (DMM) model to mitigate the complexities associated with high-dimensional representations in text data. Building upon this approach, a more refined variation known as the Gibbs Sampling DMM (GSDMM) was later introduced in [14], this improvement in model design offers better convergence and the capability to automatically infer the optimal number of topics.

Different methods have been proposed for improving short text clustering based on topic modeling methods. Qiang et al. [39]. , proposed a model based on Pitman-Yor Process using the probabilities from the model of PitmanYor where each text selects one active cluster or creates a new cluster. Moreover, a pioneering dual word graph topic model was introduced to enhance short text clustering, aiming to extract topics by considering simultaneous word co-occurrence. This approach demonstrated a superior capability in generating more cohesive topics when compared to existing topic models [40]. Another method that integrates the topic modeling with the graph convolutional networks is also proposed in [41]. This method is based on an external knowledge graph, where WordNet and a pre-trained graph are used to deal with the short noisy text. An advanced hybrid topic modeling approach, combining Latent Dirichlet Allocation (LDA) and Latent Semantic Indexing (LSI), and incorporating visualization techniques, has been presented by [42]. This method highlights its effectiveness by successfully identifying health-related topics within healthcare data.

Within the confines of the short text dataset, a substantial portion of terms tends to co-occur merely once or twice. This prevalence of limited co-occurrences poses a challenge in determining the ideal number of clusters, potentially leading to suboptimal outcomes in the categorization of topics [43, 44]. Various strategies, such as text augmentation [45], topic modeling [46], and the Dirichlet Mixture Model [14, 47, 48], have been proposed to address the challenge of sparsity in short-text clustering. Moreover, In the realm of short-text clustering models, studies have delved into innovative approaches. For instance, the Dirichlet Multinomial Mixture model (GSDMM) was introduced for short text clustering [32] which infers the number of topics and achieves the best results compared to other topic modeling and clustering algorithms [9, 11]. The drawback of this model is the defined number of clusters which the higher number increases the complexity of the model and leads to unsatisfactory results [19].

Levenshtein distance algorithm has been applied in previous studies [24, 42], specifically for text clustering. The algorithm makes use similarity metric (not an exact match) that integrates syntactic and semantic information from the text, The main drawback of this algorithm is the high complexity when large samples are presented in the dataset [24].

This paper aims to overcome the limitations of topic modeling, particularly the difficulty in determining the optimal number of clusters, and the complexity of the Levenshtein distance algorithm, particularly evident with large datasets. To overcome these challenges, the Levenshtein distance is utilized to assess the outcomes of topic modeling. This approach allows for the evaluation of the similarity of feature vectors within each topic generated by topic modeling algorithms, focusing specifically on subsets rather than the entire dataset.

Materials and methods

The proposed method is illustrated in this section. Figure 1 shows the overall process of the proposed approach. The process starts with preparing the dataset, where the collected tweets are cleaned and preprocessed. In the next step, the topic modeling methods are applied to cluster the documents into a prespecified number of topics. Once the solution is produced, a topic clustering algorithm based on the TCLD approach is performed to improve the produced solution. Finally, the performance of the proposed method is evaluated. The following subsections explain in detail the proposed approach.

Fig. 1
figure 1

The proposed approach

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Short text datasets

English benchmark datasets

Six datasets are used in this paper to validate the proposed model and demonstrate the impacts of the proposed model compared with other models. The details of these datasets are shown in Table 1, where the table represents the number of topics and the number of documents, and the AvgLength and MaxLength related to the average and maximum length of each document, and the vocabulary size, respectively. It should be noted that these datasets have gone through preprocessing [5].

Table 1 Summary of the English benchmark datasets
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SearchSnippets: This dataset was selected from the outcomes of an online search transaction using predetermined terms from 8 distinct domains. Business, computers, culture-arts, education-science, engineering, health, politics-society, and sports are the eight areas, in that order.

StackOverflow: Kaggle.com has made the dataset available. 3,370,528 samples from July 31 to August 14, 2012, make up the raw dataset. Here, 20,000 question titles from 20 distinct tags are chosen at random by the dataset.

Biomedicine: The challenge information provided on the official BioASQ website is used in the field of biomedicine.

Tweet: There are 109 queries available for use in the 2011 and 2012 microblog tracks at the Text Retrieval Conference (TREC). After eliminating the searches for which there were no highly relevant tweets, the Tweet dataset had 89 clusters and 2,472 tweets in total.

Google News: The news articles are automatically grouped into clusters on the Google News website. On November 27, 2013, the Google News dataset was obtained from the Google News website, and 152 clusters worth 11,109 news items’ titles and summaries were crawled.

PascalFlickr: A collection of captions from the PascalFlickr dataset [49] is used to assess the effectiveness of short text clustering [32].

Arabic tweets datasets

To the best of our knowledge, there is no available topic modeling short text Arabic dataset, since less work has been done for the Arabic language. In this study, the Arabic tweet datasets were collected using the Twitter API. Consequently, the dataset is made available for further investigation and can be accessed in the Data Availability and Materials section.

The Twitter API was used to collect Arabic tweets; tweets were downloaded using the Python package (tweepy). The language in the tweets was Arabic. It is important to note that the search procedure of Twitter API, returns a maximum of 18k tweets and only the data of the previous 6 to 9 days. Thus, the process was run several times, collecting 21,303 tweets based on specific geographic locations. Then, duplicated tweets were deleted, and the number of unique tweets became 17,753.

Table 2 shows a summary of the used dataset. It includes the number of topics, the number of documents, the average and maximum length per document, and the vocabulary size.

Table 2 Summary of the collected Arabic dataset
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The preprocessing task for the collected tweets is a very important task that should be performed [29,30,31, 50] since the Arabic tweets are usually not standard and complicated due to the existence of slang, diacritical marks, elongations, spelling mistakes, dialect text, and extra characters. The employed preprocessing methods are detailed below, encompassing cleaning, normalization, and stemming [51,52,53].

  1. 1.

    Tweets Cleaning: Tweets contain many noises, including elongations, hashtags, emojis, links, non-Arabic text, digits, punctuation marks, and other marks. Thus, each Arabic tweet is read character-by-character and checks if it belongs to the Arabic aliphatic and white space or not, along with removing the URLs and advertisements.

  2. 2.

    Tweets Normalization: The objective of this step is to make the text more reliable by removing diacritical marks, extra white spaces, and duplicates, and also to convert each letter to its standard form [51, 52].

  3. 3.

    Light Stemmer for Arabic Words: It is used to convert the inflected Arabic word to a common canonical form (Stem) [54]. Following [55], a stemmer is utilized for stemming Arabic words without relying on a root dictionary.

Topic modeling

Two topic modeling methods used in this research are presented in this section: LDA and GSDMM [5, 39], They were chosen based on their successful performance. The problem of short-text topic modeling is defined for each method with the required notations.

Latent dirichlet allocation (LDA)

LDA is a probabilistic generative model of a corpus. The fundamental concept is that texts are modeled as random mixtures over latent topics, with each topic being defined by a distribution over words [56].

The process of LDA is represented as follows:

  • For every topic (t) generate the Dirichlet distribution on words, \({\phi}k\) ∼ Dirichlet (β).

  • Generate a vector of Dirichlet distribution on topics θd ∼ Dirichlet(α) For every document (d).

  • For every word wn out of the N words:

  • Select a random topic td∼ Multinomial (θ).

  • Select a word (wn) from p(wn|td, β), a multinomial probability that depends on the topic td.

The LDA graphical model is represented in Fig. 2, where the observable variable is highlighted [7].

Where:

\({\phi}\) is the topic word distribution.

θ is the document topic distribution with parameters α and β.

K is the predefined number of topics.

D is the short text corpus consisting of N words.

\({\varvec{n}}_{\varvec{d}}\) is the number of words in document d.

Fig. 2
figure 2

LDA graphical model

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Gibbs Sampling for Dirichlet Multinomial Mixture (GSDMM)

GSDMM has shown good performance in dealing with highly sparse short text. GSDMM uses Gibbs sampling to assign a topic to each short text. Dirichlet Multinomial Mixture Model (DMM) [12] is a probabilistic generative model for short text. Note that each short text is produced by a mixture model, and each mixture component has one cluster.

The whole process of GSDMM is pseudo-coded in Fig. 3. Firstly, the documents are assigned randomly to K clusters, then the following parameters are initialized: T, mt, nt, and \({n}_{t}^{w}\).

Fig. 3
figure 3

GSDMM [14]

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In each iteration, the topic t is reassigned for the document d based on the p(zd = t|Z¬d, D), which represents the conditional distribution, where all topics of all documents are represented by Z and ¬d indicate the topic of document d is removed from Z. A topic t is reassigned to document d and the corresponding variables are updated every time (i.e., Z, mt, nt, and Ntw. Finally, the nonempty topics in Z will be considered as the output of the model. The GSDMM conditional probability distribution is represented in Eq. 1.

$$P\left({z}_{d}=t |{Z}_{\neg d}, D\right)\propto \frac{{m}_{t},\neg d+ \alpha }{N-1+{K}_{\alpha }} \frac{\prod _{w\in d}{\prod }_{j=1}^{{n}_{d}^{w}}({n}_{t}^{w}, \neg d+ \beta + j-1)}{{\prod }_{i=1}^{{n}_{d}}({n}_{t}, \neg d+V \beta + i-1)}$$
(1)

\(P\left({z}_{d}=t |{Z}_{\neg d}, D\right)\) is derived from the Dirichlet Multinomial Mixture (DMM) model, DMM chooses Dirichlet distribution for \({\phi}\) and θ, respectively, as a pre-distribution with parameters α and β. A topic zd is sampled in DMM for document d by θ and then generates all words in document d from topic zd by \({\phi}zd\).

The proposed topic clustering based on levenshtein distance (TCLD)

After clustering the topics with both clustering algorithms and topic modeling, an improvement of the resulting set of topics is proposed using the Levenshtein Distance algorithm. The details of the Levenshtein Distance algorithm and the proposed approach are explained as follows:

Edit distance algorithms are commonly utilized in textual similarity recognition, featuring diverse edit operations such as insertions, deletions, and substitutions, each associated with its specific cost. The cost is determined by the number of steps required to transform one text into another, reflected in the edit distance score. Employing edit distance metrics for parsing and document analysis proves to be a suitable approach for quantifying semantic similarities between documents. The Levenshtein Distance (LD) algorithm was proposed by Vladimir Levenshtein [21] to calculate the similarity between sequences of words.

The LD algorithm is used to measure the separation of two sequences of words. The LD between two words is the minimum number of edits of a single character required to change one word into another.

Mathematically, the Levenshtein distance algorithm is illustrated in Eq. (2) [22].

$${D}_{s1,s2}(i,j)\left\{\begin{array}{l}Max\left(i,j\right)\quad\quad \quad \quad \quad\quad\quad\quad\quad\quad\quad if min\left(i,j\right)=0\\ Min\left\{\begin{array}{c}{D}_{s1,s2}\left(i-1,j\right)+1\\ {D}_{s1,s2}\left(i,j-1\right)+1\\ {D}_{s1,s2}\left(i-1,j-1\right)+{1}_{{s1}_{i}\ne {s2}_{j}}\end{array}\right. otherwise\end{array}\right.$$
(2)

Where the comparison is between the two strings; s1 and s2, also, i and j are the current indexes to be evaluated, starting at |s1| and |s2| respectively. Moreover, the theoretical maximum of the Levenshtein distance is the longer string length, so if the strings have no common characters, all the characters in the shorter string have to be initially substituted, and then the rest must be added. This upper limit allows defining a similarity ratio between both strings s1 and s2 as in Eq. (3) [22, 57]:

$${D}_{ratio}\left(s1,s2\right)=1- \frac{{D}_{s1,s2}\left(\left|s1\right|,\left|s2\right|\right)}{Max\left(\left(\left|s1\right|,\left|s2\right|\right)\right)}$$
(3)

TCLD is introduced to improve the clustered topics based on semantic similarity. After applying topic modeling, the semantic similarities between documents will be measured. Figure 1 serves as an illustrative example show the proposed TCLD method, starting from calculating Levenshtein Distance, and highlighting its role in identifying outliers (Documents deviating significantly from the norm). In this scenario, the dataset comprises nine documents distributed across three topics generated by topic modeling (denoted as Topic 1, Topic 2, and Topic 3). Each document is labeled as D1(topic)1(document) (e.g., D11, D12, ..., D33). The TCLD method involves the following steps:

  1. 1.

    Compute the Levenshtein distance ratio between all documents in each clustered topic.

  2. 2.

    The documents with an acceptable distance ratio are kept in the same topic, and the rest are saved in an outlier list.

  3. 3.

    Find the representative documents (or 10 top words) among all documents in each topic.

  4. 4.

    Compute the Levenshtein distance ratio between the documents in the outlier list with the representative documents (or 10 top words) in each topic. When an acceptable distance ratio is found, the document will be moved to the corresponding topic.

  5. 5.

    Finally, check the number of documents in all topics and mark the topics that have less than or equal mindoc documents as outliers, then repeat step 4 to handle these documents. mindoc is a threshold that represents the minimum number of documents needed to keep the topic. In this study, mindoc is set to 10.

The acceptable distance ratio means that the Levenshtein distance ratio between two documents is greater than or equal to 0.35. The proposed thresholds are assumptions tested and tuned in experiment analysis. The representative document is the document that has the greatest distance ratio from other documents in each topic.

Experimental design

All of the experiments have been performed on an Intel Core i5-6200U processor with 8 GB of RAM. The experiments are designed based on two main parts. i.e., the whole dataset number of collected tweets without the actual truth-labels and the dataset with actual truth-labels. The experiment steps can be summarized as follows:

  1. 1.

    Determine the initial number of clusters based on the elbow method and GSDMM.

  2. 2.

    Apply LDA and GSDMM.

  3. 3.

    Apply the proposed method based on the TCLD as explained in Sect. 3.3.

  4. 4.

    Evaluate the clustering performance based on intrinsic measures, because actual truth-labels are not available.

  5. 5.

    Generate the dataset with truth-labels.

  6. 6.

    Evaluate and fine-tune the dataset with truth-labels using eyeballing, intrinsic evaluation metrics, and human judgments.

  7. 7.

    Apply and evaluate the new dataset using LDA and GSDMM.

  8. 8.

    Apply the proposed TCLD with two methods of dealing with the documents in the outlier list, where the documents in the outlier list are compared with the representative document in each topic (TCLD-RD) and with the top 10 words from each topic (TCLD-TW).

  9. 9.

    Evaluate and compare TCLD-RD and TCLD-TW.

Performance evaluation

Clustering performance is evaluated by relying on intrinsic and extrinsic measures. Intrinsic measures inspect the separation and compaction of the clusters and do not require ground truth labels. In this work, the Silhouette score (SI) and Davies-Bouldin Index (DBI) [58, 59] are used as intrinsic or internal measures. The indication value of SI ranges between 1 and − 1, where 1 is the best value, the worst is -1, and the overlapping clusters are indicated by values close to 0. On the other hand, DBI is a ratio calculated between the cluster scatter and the separation of the cluster, where a lower value of DBI indicates better clustering.

As aforementioned, the extrinsic and external measures require the ground truth labels to be compared with the predicted clusters. In this work, the Normalized Mutual Information (NMI), Adjusted Mutual Information (AMI), Homogeneity score (HS), and purity are used as extrinsic measures [9, 14]. Where the higher values of NMI, AMI, HS, and purity indicate a better clustering quality.

Results and discussion

We present the experimental results in this section, aligning with the experimental design outlined in Sect. 3.4. This presentation aims to illustrate the robustness and efficacy of the proposed method for short-text clustering, using six benchmark datasets reported in Sect. 3.1.1. The parameter settings are tuned and the final settings are as follows: LDA parameters are determined to be alpha = 0.05 and beta = 0.01. and GSDMM parameters are set k = 100, alpha = 0.1, and beta = 0.1. For both models, the number of iterations is set to 100.

Results on benchmark datasets

Table 3 shows the performance with clustering algorithms of LDA and GSDMM relying on purity, Homogeneity, NMI, AMI, SI, and DBI. Besides the results of the proposed Levenshtein Distance for improving the Topic Clustering (TCLD). The proposed TCLD is applied to the output from GSDMM and LDA. The results show the comparison of two methods dealing with the documents in the outlier list, as follows: (a) using the top 10 words from each topic (TCLD-TW). (b) using the representative document in each topic (TCLD-RD).

Table 3 Results of all models on benchmark datasets
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The results using the clustering metrics are shown in Table 3. GSDMM demonstrates superior performance, as indicated by the valuation metrics. The results of both GSDMM and LDA are further enhanced with the application of the proposed TCLD technique. This improvement is attributed to the TCLD approach, which evaluates each document in existing topic modeling solutions, thereby enhancing clustering results. Additionally, GSDMM with TCLD-TW performs better than GSDMM with TCLD-RD, demonstrating that moving a document from the outlier list to the appropriate topic may be accomplished by comparing the outlier list with the top 10 words from each topic. In this study, the impact of the acceptable distance ratio on the performance of TCLD was explored, taking into consideration the execution time, the time used to generate the results of the TCLD-TW is acceptable because the processing will be for each topic individually.

Fig. 4
figure 4

Influence of the Acceptable Distance Ratio Using TCLD-TW GSDMM

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Fig. 5
figure 5

Influence of the Acceptable Distance Ratio Using TCLD-TW LDA

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Figures 4 and 5 depict the results of TCLD-TW GSDMM and TCLD-TW LDA when varying the acceptable distance ratio from 30 to 60 measured by SI on the six datasets. This evaluation matrix was chosen based on the fact that the model should not reveal the true value of the topics. Observing the results, both TCLD-TW GSDMM and TCLD-TW LDA demonstrate effectiveness within a favorable range when the ratio is between 0.4 and 0.5. When the ratio is insufficient, there will be no outliers in the cluster. The higher the ratio, the greater the number of outliers extracted. When SI stabilized, the ratio was between 0.4 and 0.5, and if the ratio increased, the results became worse. This indicates that the model accepts samples with small distances, and this worsens the results.

Comparison with the state-of-the-art topic models

We further compared the results of the best-performing algorithm TCLD-TW GSDMM, with other topic modeling. According to the findings of Qiang et, al [5]. , the approaches that showed the most promise for short-text topic modeling include the latent-feature Dirichlet multinomial model (LF-DMM), generalized Polya urn DMM (GPU-DMM), and other topic modeling conducted in the survey such as Biterm Topic Modeling (BTM), Self-aggregation based topic modeling (SATM) and pseudo-document-based topic modeling (PTM). Table 4 shows the results measured by purity and NMI on the six datasets.

Table 4 Results of all models on six datasets
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As can be observed from Tables 4 and 83% of the results achieved by the TCLD-TW GSDMM outperform other models in terms of purity and 67% in terms of NMI. The computed mean values of purity and NMI confirm that the proposed method improves the results in both purity and NMI when considering purity, the TCLD-TW GSDMM achieved the best mean value followed by in order BTM, LF-DMM, GPU-DMM, PTM then SATM. Also, in terms of NMI the TCLD-TW GSDMM achieved the best mean value followed by in order LF-DMM, BTM, GPU-DMM, PTM then SATM.

Case study: arabic dataset

The results of the proposed method are presented in this section. Two Arabic datasets were used in this work. The dataset with unknown actual truth labels and the dataset with known actual truth labels are as follows:

Results on the dataset without the actual truth-labels

This study determines the initial number of topics based on K-Means clustering. The Elbow method is used to determine the range of clusters. Figure 6 shows the sum of squared distance and the number of clusters (in the range of 2–1000).

Fig. 6
figure 6

Distortion Score Elbow for K-Means Clustering

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After identifying the initial number of topics, the GSDMM method was applied, where the parameter settings for LDA and GSDMM models were trained according to the following parameters: alpha: 0.1 and beta: 0.01. Testing both algorithms was conducted with two different values of iterations: 50 and 100. These hyper-parameters are executed to train the model. Really low alpha values mean that a document may have one topic, while for a large alpha value, the topics become uniform.

GSDMM can determine the number of clusters in the dataset and requires only an upper bound K [60]. The number of clusters in GSDMM works based on the Movie Group Process [14], where the documents are randomly assigned to K topics at initialization. For each document, the probability distribution list over the k topics is generated. At every iteration, each document will be assigned to a topic that satisfies one or both of the following conditions:1) The new topic is empty, or it has more documents than the current topic. 2) The new topic has documents with a higher number of word occurrences. The number of topics generated by GSDMM is shown in Fig. 7.

Fig. 7
figure 7

Number of Topics Generated by GSDMM Using 50 and 100 Iterations. (a) Silhouette Score for GSDMM. (b) Davies-Bouldin Index for GSDMM

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As shown in Fig. 7a, the number of topics is not stable, and it is hard to determine the number of topics based on a single method. Even when the number of iterations increases (Fig. 7b), the number of topics changes according to the number of iterations, so if the algorithm is stopped at any point along the x-axis in Fig. 7a, b and a different number of topics is obtained. As illustrated in Fig. 6a, utilizing 40 iterations results in 43 topics with a Silhouette score of -0.0062 and a Davies-Bouldin Index of 19.46. Conversely, Fig. 8b shows that utilizing 30 iterations yields 51 topics with a Silhouette score of -0.0064 and a Davies-Bouldin Index of 18.71. In this case, even the internal measures are not able to determine the number of topics.

Fig. 8
figure 8

Silhouette Score and Davies-Bouldin Index of GSDMM with 500 Iterations. (a) Silhouette score of GSDMM with 500 iterations. (b) Davies-Bouldin Index of GSDMM with 500 iterations

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The results of using GSDMM and LDA with different numbers of topics and different numbers of iterations are represented in Table 5. It can be seen that the performance of both topic modeling methods is better when the number of iterations is 50 compared with 100 iterations. In addition, upon comparing the results based on the number of topics, the optimal outcomes were observed when the number of topics was set at 51, outperforming configurations with 43 and 86 topics.

Table 5 Comparative results using various number of topics
Full size table

The findings revealed that the models do not produce good outcomes. Because there is not enough word co-occurrence, the documents are sparse, and the number of words in each document is limited. After manually checking the produced topics, it was observed that the documents were not effectively grouped, leading to suboptimal results. This outcome is attributed to the large number of topics represented. Some topics are incorrectly grouped with other documents; hence, an enhancement of the clustering results is proposed, specifically TCLD (see Sect. 3.3).

At this stage, the proposed TCLD is applied. Utilizing the output from the topic modeling, the Levenshtein distance ratio is calculated for each document within a topic. The Levenshtein distance serves to measure the difference between documents. This method is employed to filter out irrelevant and duplicated documents in the cluster, considering a Levenshtein distance ratio of less than 15%. Subsequently, the identified irrelevant documents are assigned to the outlier list (see Sect. 3.3). The outlier list has contained irrelevant documents and has been excluded from the dataset when the documents do not have an acceptable distance ratio (50% in this work) compared to the representative document in each topic. The representative document determines that the document has a greater distance ratio compared with other documents in each topic. Finally, the topics that have less than or equal to mindoc documents are marked as outliers. The computational time cost of this method is acceptable because the execution will be in parallel with all topics. The final results using the proposed method are represented in Table 6.

Table 6 LDA and GSDMM with TCLD
Full size table

Table 6 shows that the SI and DBI are improved and the number of topics is reduced. Finally, the labeled dataset with the most topics that can be represented is summarized in Table 7. This dataset has been validated using eyeballing, intrinsic evaluation metrics, and human judgments.

Table 7 The Summary of the Datasets with Identified Topics
Full size table

Figure 9 presents the distribution of documents over the nine topics, where the figure gives the number of documents that belong to each topic.

Fig. 9
figure 9

The distribution of documents over the selected 9 topics

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The number of topics produced by the proposed approach was able to find nine topics with 1,421 documents among the 17,753 documents that exist in the collected tweets. The rest of the documents either do not have enough documents to produce a topic where the minimum number of documents is 10 to keep the topic. Figure 10 shows the TSNE dimensionality reduction method for visualization of the documents’ clusters.

Fig. 10
figure 10

Number of documents in each topic

Full size image

Results with known actual truth-labels

In this section, the dataset with ground-truth labels and the generated dataset from the previous section is utilized to validate the results of the proposed algorithm based on extrinsic evaluation measures. These measures evaluate clustering performance by comparing the ground truth-labels and predicted labels.

The methods used to evaluate the dataset are LDA and GSDMM for topic modeling. Table 8 shows the performance of clustering algorithms relying on purity, homogeneity, NMI, and AMI. The results illustrate that the method of GSDMM has superior performance. There is approx. 15% enhancement in the NMI and AMI scores when the results of GSDMM are compared with the LDA model. Also, Table 5 shows the results of the proposed Levenshtein Distance for the Improvement of Topic Clustering (TCLD).

The proposed TCLD is applied to the output from GSDMM and LDA. The results show the comparison of two methods of dealing with the documents in the outlier list, as follows:

  • TCLD-RD compares documents in the outlier list with the representative document in each topic.

  • TCLD-TW compares documents in the outlier list with the top 10 words from each topic.

Table 8 The performance of the clustering algorithms with TCLD.
Full size table

As shown in Table 8, the external measures indicate that the results of GSDMM and LDA are improved using the proposed TCLD method because the TCLD method evaluates each document in the current solutions provided by the topic modeling and enhances the clustering output. Moreover, GSDMM with TCLD-TW performs better than GSDMM with TCLD-RD, which means comparing the outlier list with the top 10 words of each topic can move the document correctly from the outlier list to the relevant topic.

TCLD-TW yielded 76 documents as outliers. Upon manual inspection, only 52 documents were correctly identified as outliers. As illustrated in Table 8, the optimal outcome was achieved when comparing the performance of the algorithms against clustering algorithms and TCLD. GSDMM emerged as the best performer and observed superior results with TCLD-TW compared to TCLD-RD.

Conclusion

In this paper, a new method for enhancing the topic modeling methods is proposed. The proposed topic clustering based on Levenshtein distance (TCLD) focuses on refining the position of each clustered document. The main objective of TCLD is to overcome the problem of irrelevant documents within each topic by either relocating them to more suitable topics or identifying them as outliers. This strategy allows the effective tackling of the challenge of an unknown number of topics and the effect of noises in the dataset. As a result, this strategy ensures the elimination of topics lacking sufficient document representation, leading to an accurate determination of the appropriate number of topics. Six English benchmark datasets have been used to evaluate the proposed methods and compare them to other topic modeling approaches, including LDA, GSDMM, LF-DMM, BTM, GPU-DMM, PTM, and SATM.

The proposed TCLD incorporates different approaches to comparing the distances between the documents by finding the representative document (TCLD-RD) or 10 top words from each topic (TCLD_TW). The results showed that TCLD_TW showed better performance compared with TCLD-RD, resulting in an 83% improvement in overall dataset performance concerning purity and a 67% improvement in terms of NMI compared to other topic modeling techniques.

Testing the proposed method on the collected Arabic tweets showed that the two topic modeling methods were unable to cluster the documents effectively, as presented in the result section. This might be due to the existence of irrelevant documents; the documents are sparse, and the number of words in each document is limited. TCLD was able to overcome this limitation, and finding roughly the correct number of topics eliminated the outliers. As a result, only 12% of the short tests in the Arabic datasets, according to human inspection, are incorrectly clustered. where TCLD_TW identified 76 tweets as outliers, but manual validation revealed that only 52 are outliers. Based on the results found, applying this model to more complex data and improving its results by accepting the movement of the texts between topics based on an objective function will be our future work direction.

Data availability

and Materials.

The datasets generated during and/or analysed during the current study are available in the [github] repository, [https://github.com/MlkZaq/arabic-short-text-clustering-datasets].

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Acknowledgments

Many thanks to the Deanship of Scientific Research at the Imam Abdulrahman Bin Faisal University for supporting this research.

Funding

This work was supported by the Deanship of Scientific Research, Imam Abdulrahman Bin Faisal University, Grant number BASRC-083-2020.

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Authors and Affiliations

  1. Department of MIS, College of Applied Studies and Community Service, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia

    Mutasem K. Alsmadi & Ibrahim ALmarashdeh

  2. Department of Mathematics, College of Science, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia

    Malek Alzaqebah, Maram Alwohaibi, Noha A. Al-Mulla & Eman AE Ahmed

  3. Basic and Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, P. O. Box 1982, Dammam, Saudi Arabia

    Malek Alzaqebah, Maram Alwohaibi, Noha A. Al-Mulla & Eman AE Ahmed

  4. Computer Science Department, Community College Dammam, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia

    Sana Jawarneh

  5. Artificial Intelligence Research Center (AIRC), College of Engineering and Information Technology, Ajman University, Ajman, United Arab Emirates

    Mohammed Azmi Al-Betar

  6. Department of Data Science and Artificial Intelligence, Zarqa University, Zarqa 13100, Jordan

    Ahmad AL Smadi

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Mutasem K. Alsmadi, Sana Jawarneh, Malek Alzaqebah, Ibrahim ALma-rashdeh, Mohammed Azmi Al-Betar, Maram Alwohaibi, Noha A. Al-Mulla, Eman AE Ahmed and Ahmad AL Smadi. The first draft of the manuscript was written by Mutasem K. Alsmadi and Malek Alzaqebah and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Alsmadi, M.K., Alzaqebah, M., Jawarneh, S. et al. Hybrid topic modeling method based on dirichlet multinomial mixture and fuzzy match algorithm for short text clustering. J Big Data 11, 68 (2024). https://doi.org/10.1186/s40537-024-00930-9

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