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| "paper_id": "2021", | |
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| "date_generated": "2023-01-19T03:35:38.600001Z" | |
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| "title": "TeMoTopic: Temporal Mosaic Visualization of Topic Distribution, Keywords, and Context", | |
| "authors": [ | |
| { | |
| "first": "Shane", | |
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| "last": "Sheehan", | |
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| "institution": "University of Edinburgh United Kingdom", | |
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| "email": "shane.sheehan@ed.ac.uk" | |
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| { | |
| "first": "Saturnino", | |
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| "last": "Luz", | |
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| "institution": "University of Edinburgh United Kingdom", | |
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| "email": "s.luz@ed.ac.uk" | |
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| { | |
| "first": "Masood", | |
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| "last": "Masoodian", | |
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| "institution": "Aalto University", | |
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| "abstract": "In this paper we present TeMoTopic, a visualization component for temporal exploration of topics in text corpora. TeMoTopic uses the temporal mosaic metaphor to present topics as a timeline of stacked bars along with related keywords for each topic. The visualization serves as an overview of the temporal distribution of topics, along with the keyword contents of the topics, which collectively support detail-on-demand interactions with the source text of the corpora. Through these interactions and the use of keyword highlighting, the content related to each topic and its change over time can be explored.", | |
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| "text": "In this paper we present TeMoTopic, a visualization component for temporal exploration of topics in text corpora. TeMoTopic uses the temporal mosaic metaphor to present topics as a timeline of stacked bars along with related keywords for each topic. The visualization serves as an overview of the temporal distribution of topics, along with the keyword contents of the topics, which collectively support detail-on-demand interactions with the source text of the corpora. Through these interactions and the use of keyword highlighting, the content related to each topic and its change over time can be explored.", | |
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| "text": "Many text corpora, such as news articles, are temporal in nature, with the individual documents distributed across a span of time. As the size and availability of text corpora have continued to increase in recent years, effective analysis of the content of corpora has become challenging. Taking the temporal nature of most corpora into account when analysing the text makes it more difficult to describe the corpora and to interpret intuitively the results of analysis.", | |
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| "section": "Introduction", | |
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| "text": "Topic modeling techniques, such as Latent Dirichlet Allocation (LDA) (Blei et al., 2003) , have been used to automatically generate topic groups in text corpora. These topics can help in understanding the contents of a corpus by using keywords and topic association probabilities generated by the topic modelling technique. However, interpreting the results of the techniques is not always easy, and the results can seem counter-intuitive when looking only at the weighted keyword lists. Therefore, visualization techniques have been used extensively to help with the interpretation of the large number of topics generated by these models. The same is true of temporal topic modeling techniques, such as Dynamic Topic Modeling (Blei and Lafferty, 2006) , which require additional visualization techniques to aid intuitive understanding of the temporal segmentation of the topics and their related keywords.", | |
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| "text": "In this paper, we propose TeMoTopic as a contribution to the collection of visualization techniques for exploring the temporal distribution of topics in text corpora through the use of temporal mosaics. TeMoTopic adopts a space-filling approach to show topic distribution over time, and presents keywords related to each topic at the overview level of the visualization. The visualization is interactive and, in contrast to many other techniques, enables direct investigation of the source documents associated with individual topics and keywords. This allows the user to get a general sense of the meaning of a topic through its associated keywords, as well as providing the ability to dive into the details of the related documents.", | |
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| "text": "Topic visualization systems are an active research area, with a variety of approaches for visualizing different aspects of topic model outputs, topic hierarchies, and topic evolution. In this paper, we only focus on related work in the area of temporal topic evolution and topic visualization of text corpora. While some methods address the temporal structuring of topics in short texts in the context of meetings and dialogues (Luz and Masoodian, 2005; Sheehan et al., 2019) , in recent years, visualization of temporal topic evolution for larger text collections has been based on flow diagrams. An early example of such an approach is ThemeRiver (Havre et al., 2002) , with later additions such as TextFlow (Cui et al., 2011) , TopicFlow (Malik et al., 2013) , ThemeDelta (Gad et al., 2015) and RoseRiver (Cui et al., 2014) .", | |
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| "section": "Temporal Topic Visualization", | |
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| "text": "While TeMoTopic and flow-based temporal topic visualizations are similar, we expect they could form complementary components used in model assessment tools that are used to evaluate model quality. Flow diagrams are, for instance, useful for getting a high-level overview of many topics across long spans of text. TeMoTopic, on the other hand, aims to provide support for detailed viewing of a subset of topics and shorter timeslices, which are not possible in a flow diagram. As such, we envisage that other existing visualization tools which include a flow diagram component -such as LDA-Explore (Ganesan et al., 2015) , VISTopic (Yang et al., 2017) , ParallelTopics (Dou et al., 2011) and TIARA (Wei et al., 2010) -could be further expanded to include a temporal mosaic visualization, in the style of TeMoTopic. The largest benefit to this integration would come from enabling intuitive interactive filtering of the source documents based on the temporal topic and keyword distribution.", | |
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| "text": "The design of a visualization tool should clearly be motivated by concrete tasks relevant to the endusers of the intended tool. Munzner's nested model for visualization design and validation (Munzner, 2009) describes steps that can be taken to mitigate threats to the validity of a visualization design. The first of the four levels of this design model is the characterization of domain specific tasks which should be supported by the visual encoding. Ganesan et al. (2015) identify key tasks, in the design description of LDAExplore, which should be supported by visualizations that aim to help users explore the results of Latent Dirichlet Allocation (LDA). Since LDA is one of the most commonly used topic modelling techniques for text corpora, these key tasks could be generalized to other techniques where a corpus is also split into topics, and keywords associated with those topics are extracted.", | |
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| "text": "In addition, Ganesan et al. (2015) argue that the results of LDA can be counter-intuitive, and that the ability to explore and interact with the document set should make the topic and word distributions more intuitive and insightful. Table 1 shows the eight tasks identified by Ganesan et al. (2015) , as well as one additional task which we consider to be important for visualizing temporal topics. The table also includes a brief description of the tasks which are fully described by Ganesan et al. (2015) .", | |
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| "text": "Theses tasks describe a need for topic overview with document detail available on-demand, this follows the well-known visual information seeking mantra proposed by Shneiderman (1996) . Interactions around viewing, filtering, removing, and combining topics and documents should also be supported. Finally, we include an additional task for visualizing topic changes over time. This modifies the Visualize Topics task, such that the change in distribution and keywords across is available to explore.", | |
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| "text": "3 TeMoTopic: Temporal Mosaic Topic visualization Figure 1 shows the TeMoTopic visualization tool. It consists of two juxtaposed views (Javed and Elmqvist, 2012) : the temporal mosaic (left), and the document view (right). The design of the temporal mosaic is based on a visualization proposed by Luz and Masoodian (2007) , and further expanded in our previous temporal mosaic visualizations TeMoCo visualization (Sheehan et al., 2019) and TeMoCo-Doc visualization (Sheehan et al., 2020) , which have been used to link transcripts of meetings to document reports in a medical context. ", | |
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| "text": "The temporal mosaic encoding was designed using Mackinlay's ranking (Mackinlay, 1986) of visual variables (Bertin, 1983) , such that the visualization uses a perceptually efficient static encoding of the key data attributes. Horizontal position is used to emphasize the temporal order of the topics, and topic distribution per timeslice is encoded using vertical length. Each tile in the mosaic represents a single combination of topic and timeslice. The height of each tile represents its topic weight in that timeslice.", | |
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| "text": "The top ten keywords which describe the associated temporal topic are placed within the tile, and can be scaled to encode the keyword topic probability, using area in a manner similar to keyword scaling in text visualizations such as word clouds (Viegas et al., 2009) . Although the keywords are currently presented in order of descending topic probability, in future work alternative keyword presentation styles such as alphabetized lists and word clouds will be compared in terms of their effectiveness for comparison between the tiles. The categorical topics are encoded using color, allowing topics weights and keyword changes to be examined across the span of timeslices.", | |
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| "text": "The mosaic visualization provides an overview of the topic distribution and associated keywords over time. However, as the number of topics and timeslices increase, if the visualization area is kept at a fixed size, the overview would become more abstract, cluttered, and difficult to examine for individual tiles and keywords. To maintain readability, the visualization can extend both horizontally and vertically to accommodate more topics and timeslices. The user can pan and zoom to get the detailed views of topics and keywords, or a higherlevel view of the entire temporal topic space. The removal interaction is particularly useful when the number of topics is large, since filtering out topics that are not relevant to the current analysis allows for more of the detail to be presented on a single screen.", | |
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| "text": "The temporal mosaic, as currently described, addresses two of the tasks from Table 1, namely Visualize Topics and Visualize Topic Change. To facilitate Overview of Document -Topic Relations, the document view (Figure 1, right) was created and linked, via click interactions, to the temporal mosaic (Figure 1, left) . The document view is used to display the documents associated with a temporal topic tile. When a coloured tile is selected in the temporal mosaic, the related articles are presented in a scroll box and, the keywords from the topic tile are highlighted in the text. If keyword weights (or probabilities) are provided, the highlighted words are scaled accordingly. This dual combination of views and described interactions, support the user in investigating the meaning of a topic, and by investigating the differences between the topic timeslices, temporal document similarities and differences can be revealed.", | |
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| "text": "Although it is useful to view the entirety of a topic, Filtering Documents is a task that was also identified as important to facilitate. One simple and intuitive way to do this with the temporal mosaic is by clicking on individual keywords rather than on the entire topic tile. This will cause the document view to display only documents from the related topic timeslice which contain the selected keywords, as shown in Figure 2 . Selection from multiple topics is also possible, and the keywords are highlighted in the related topic colour to differentiate between topics.", | |
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| "text": "The final interaction supported by this version of TeMoTopic is the removal of topics from the temporal mosaic. To do this, a topic can be selected from the legend shown above the temporal mosaic (Figure 3, top) . Alternatively right-clicking on a topic removes all the other topics except the selected one. In the example shown in Figure 3 , the blue topic has been removed from the temporal mosaic. When topics are removed, the temporal mosaic no longer fills the entire vertical space of the visualization. This interaction is useful when dealing with a large number of topics of which only a few are of interest for the analysis.", | |
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| "text": "The visualization tool 1 is implemented as a singlepage web application using the D3.js framework (Bostock et al., 2011) . It takes two JavaScript Object Notation (JSON) files as input: the first file contains topic, keyword, timeslice, weights, and associated filenames, and the second input file is simply a JSON structure containing the documents with filename used as the retrieval key. Sample Python scripts are provided for generating topics and keywords on the sample dataset and for preparing the visualization input files from the model output.", | |
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| "text": "The current version of TeMoTopic was designed to be model agnostic, and can even be used for tasks unrelated to topic model exploration. For example, metadata attributes such as the source of the news articles or their author could be used in place of topics. Keywords could be extracted using any available technique, including simple frequency lists. The visualization could also be used for corpus comparison and even cross-lingual analysis using entire corpora as replacements for the topics.", | |
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| "text": "However, in our implementation we make use of dynamic topic modelling (Blei and Lafferty, 2006) to identify temporal topics and keywords in a subset of the de-news 2 corpus of German-English parallel news. The dataset consists of transcribed German radio broadcasts which were manually translated into English. Between 1996 and 2000 volunteers selected and transcribed five to ten of these news broadcasts per day and added them to the dataset. In the examples of TeMoTopic, shown in Figures 2, 1 and 3 , we selected a ten month span of the dataset and presented the four largest topics. The choice of time span and topic number was only for presentation and to exemplify the interface features. We did not attempt to choose a time period or number of topics based on prior knowledge of the news relevant at the time in Germany. We present our examples to describe the interface and interactions, rather than as an analysis of the dataset, and we choose to draw no conclusions about the dataset contents and topics.", | |
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| "text": "While many other temporal visualization techniques, such as ThemeRiver (Havre et al., 2002) , offer some of the functionality for temporal visualization of topics or visualization of content changes, they do not feature implicit linking between the visualization and the underlying content documents. We consider this to be the main contribution of TeMoTopic visualization and its distinguishing feature with regards to the state of the art. As such, determining the necessity and validity of this approach in the identified domain is an important step before further development of the visualization prototype. Future work will, therefore, include evaluating the usability of a future iteration of the system with domain experts in both news analysis and topic modelling.", | |
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| "section": "Conclusions", | |
| "sec_num": "4" | |
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| "text": "The software and working example are available at https://github.com/sfermoy/TeMoCo.2 http://homepages.inf.ed.ac.uk/pkoehn/ publications/de-news/", | |
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| "text": "The work of the first and second authors is supported by European Union's Horizon 2020 research and innovation programme under grant agreement No 825153, project EMBEDDIA (Cross-Lingual Embeddings for Less-Represented Languages in European News Media). The results of this paper reflects only the authors' view and the Commission is not responsible for any use that may be made of the information it contains.", | |
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