ACL-OCL / Base_JSON /prefixL /json /lchange /2022.lchange-1.1.json
Benjamin Aw
Add updated pkl file v3
6fa4bc9
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"paper_id": "2022",
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"date_generated": "2023-01-19T12:11:25.143461Z"
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"title": "A Multilingual Benchmark to Capture Olfactory Situations over Time",
"authors": [
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"first": "S",
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"last": "Menini",
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"email": "menini@fbk.eu"
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"last": "Paccosi",
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"email": "tpaccosi@fbk.eu"
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"last": "Tonelli",
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"email": "satonelli@fbk.eu"
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"email": "inger.leemans@huc.knaw.nl"
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"last": "Lisena",
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"email": "lisena@eurecom.fr"
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"last": "Troncy",
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"email": "troncy@eurecom.fr"
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"last": "Tullett",
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"last": "Novalija",
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"last": "Mladeni\u0107",
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"abstract": "We present a benchmark in six European languages containing manually annotated information about olfactory situations and events following a FrameNet-like approach. The documents selection covers ten domains of interest to cultural historians in the olfactory domain and includes texts published between 1620 to 1920, allowing a diachronic analysis of smell descriptions. With this work, we aim to foster the development of olfactory information extraction approaches as well as the analysis of changes in smell descriptions over time.",
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"text": "We present a benchmark in six European languages containing manually annotated information about olfactory situations and events following a FrameNet-like approach. The documents selection covers ten domains of interest to cultural historians in the olfactory domain and includes texts published between 1620 to 1920, allowing a diachronic analysis of smell descriptions. With this work, we aim to foster the development of olfactory information extraction approaches as well as the analysis of changes in smell descriptions over time.",
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"text": "Human experience is mediated through the senses, which we use to interact with the world. Since the perceptual world is so important to us, all languages have resources to describe the sensory perception. Nevertheless, previous research showed that, at least in Western European languages, the visual dimension is prevalent in language, with a richer terminology used to describe it, while the olfactory dimension is less represented (Winter, 2019) . For example, in English, there are less unique words for the smell domain than for the other senses. They are also used less frequently and olfactory descriptions are often a target of cross-modal expressions.",
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"section": "Introduction",
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"text": "Sensory terminology has been researched previously, with the goal to build resources and to analyse how the different senses are described in language (Tekiroglu et al., 2014b,a) . Some research is specifically devoted to smell (Lefever et al., 2018) , but they all focus on contemporary language. One notable exception is the collection of essays published in J\u0119drzejowski and Staniewski (2021) , where olfaction in different languages is analysed in a diachronic perspective. For example, Strik Lievers (2021) describes how the olfactory lexicon has changed from Latin to Italian.",
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"section": "Introduction",
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"text": "In this work, we contribute to the diachronic analysis of olfactory language by annotating a multilingual benchmark with smell situations spanning three centuries. Compared to existing studies, our focus is not on the occurrences of single terms, but we rather capture smell events in texts, i.e. more complex structures involving different participants. The benchmark currently covers six languages (Dutch, English, French, German, Italian and Slovene). Annotation of Latin data is ongoing, but we do not include here the results for this language because they are still preliminary.",
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"section": "Introduction",
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"text": "We describe the annotation guidelines and the document selection process. Our benchmark includes texts issued between 1620 and 1920 covering ten domains of olfactory interest to cultural history. We release the benchmark at https://github.com/Odeuropa/ benchmarks_and_corpora and we present a first analysis of its content.",
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"section": "Introduction",
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"text": "Studies on olfactory language in cognitive science primarily focus on the verbal expressions of the odour perceived (Majid and Burenhult, 2014; Majid et al., 2018) , while in historical studies, instead, they mainly deal with the textual accounts of experienced smells, as in Tullett (2019) . Within the NLP community, little attention has been devoted to the automatic analysis of smell references in texts. Most works have focused on the creation of lexical databases, for example Tekiroglu et al. (2014b,a) worked on the creation of Sensicon, representing the first systematic attempt to build a lex-1 icon automatically associated to the five senses. Other studies have focused on synaesthetic aspects of language, dealing with the multisensoriality of sensory words. For instance, Lievers and Huang (2016) create a controlled lexicon of perception, while Girju and Lambert (2021) propose to use word embeddings for the extraction of sensory descriptors and their interconnections in texts.",
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"text": "As regards smell-specific works, Brate et al. (2020) propose both a simple annotation scheme to capture odour-related experiences and two semi-supervised approaches to automatically replicate this annotation. Lefever et al. (2018) present an automated analysis of wine reviews, where olfaction plays a fundamental role, while McGregor and McGillivray (2018) introduce an approach to automatically identify smell-related sentences in a corpus of historical medical records using distributional semantic modelling. More recently, Tonelli and Menini (2021) present FrameNet-inspired guidelines to annotate smell events in texts. We consider this work the starting point upon which we build our annotation task. In particular, we aim at assessing the underlying assumptions of such guidelines: whether frames can be applied diachronically and across languages using the same annotation scheme.",
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"text": "Annotation of olfactory events and situations in texts is a new task that was recently introduced in Tonelli and Menini (2021) . We adopt the same framework in this work, whose guidelines are summarised below.",
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"text": "Olfactory annotation is inspired by the FrameNet project (Ruppenhofer et al., 2006) 1 which, focusing on the semantic dimension of situations and participants, should be easily applicable to multiple languages and constructions. In FrameNet, events and situations are so-called frames and are used as synonyms for schemata, semantic memory or scenarios. They represent the components of the internal model of the world that language users have created by interpreting their environment (Fillmore, 1976) .",
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"text": "According to frame semantics, a frame includes two main components: lexical units (LUs) and frame elements (FEs). The former are words, multiwords or idiomatic expressions that evoke a specific frame, while the latter are frame-specific se-1 https://framenet.icsi.berkeley.edu mantic roles that, in case of verbal LUs, are usually realized by the syntactic dependents of the verb. For example, the Commerce pay frame includes as lexical units 'pay', 'payment', 'disburse', 'disbursement', 'shell out', and has the following frame elements: Buyer, Goods, Money, Rate, Seller.",
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"text": "While FrameNet aims to be a general-purpose resource, the guidelines we follow only concern olfactory situations. Therefore, the scope of our annotation considers only smell-related lexical units and a single frame of interest, the Olfactory event. The same structure as the original FrameNet is adopted based on lexical units and related frame elements. When necessary, domainspecific semantic roles are introduced upon discussions with experts in olfactory heritage and history. For example, the roles Smell source, Evoked odorant and Odour carrier were not originally in FrameNet, while some generic roles such as Perceiver, Time, Location and Circumstances are borrowed from the original resource. An overview of the frame elements included in our annotation is shown in Table 2 .",
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"text": "The list of lexical units (LUs) was defined with the help of domain experts, choosing smell-related lexical units that evoke olfactory situations and events. The LU lists were created in six languages, namely English, Dutch, Italian, French, German and Slovenian. They include basic smell-related terms, which are generally comparable across languages (for instance the translation of words such as 'to smell', 'odour' 'odorous', 'smelly', 'perfume'). The lists were extended with languageand culture-specific terms, such as German compound nouns created with the roots '-gestank' and '-geruch', e.g. Regengeruch ('rain smell') or Viehgestank ('cattle stink'). The initial version of the list is reported in Table 1 .",
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"text": "We consider these guidelines appropriate for our task because they have been designed following a multilingual perspective, with no languagespecific adaptations. Furthermore, as we annotate documents from different time periods, LU lists are not fixed, giving the possibility to add new items as the outcome of the annotation process. Other was included in the list for documents which are relevant to the olfactory dimension but do not fall within any of the previously mentioned categories. Ideally, the benchmark should contain 10 documents for each category, distributed evenly over the time period between 1620 and 1920, for a total of 100 documents. However, no strict length requirements were defined for each document, because their availability and characteristics change drastically across languages. In some cases, a document may be few pages with dense olfactory in- formation, while in some other cases a book could contain smell references scattered throughout the volume. Therefore, each of the six annotation teams was free to apply the most appropriate criteria for the selection of documents to annotate. For example, Dutch annotators decided to focus on short text snippets of around 20 sentences. For Italian and English, longer passages up to a few hundred sentences are included. Other differences across languages concern the quality and variety of available documents in digital format. While for some languages, such as Dutch and English, large online repositories exist and it was possible to find documents belonging to each of the 10 domains and covering the time span of interest, the limited availability of digital repositories of Slovenian texts does not allow the collection of the full set of documents. This is the main reason why there are some qualitative and quantitative differences among languages.",
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"text": "Annotations were performed using INCEp-TION (Klie et al., 2018) , a web-based platform which allows three levels of authorisations (ad-ministrator, curator, annotator) and is therefore particularly suitable to support large annotation efforts like ours. A screenshot of the interface is shown in Figure 1 .",
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"text": "We implement two quality control measures: 1) a web-based consistency checker, and 2) double annotation of a set of documents for each language to compute inter-annotator agreement and discuss difficult cases.",
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"text": "Given the complexity of the annotation process, which is carried out by multiple annotators for each of the six languages, it is important to ensure that the different annotations are consistent with the instructions provided in the guidelines.",
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"text": "To facilitate a consistency check, we developed a web-based tool to automatically find when annotations are not compliant with the guidelines. The tool takes an exported WebAnno file from IN-CEpTION as input and outputs a report describing which inconsistencies are found and where (with document ID, sentence number and string). This makes it straightforward to find the mistake and fix it quickly.",
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"text": "The inconsistencies identified in the files are related to both incorrect and missing annotations, focusing on the annotation procedure and not the content of the annotations. For instance, it checks if every frame element is properly connected to a smell word and if all selected spans have been assigned to a corresponding label. Operating at the level of labels and relations, that are the same for every language, and not considering the text content, the tool is language-independent.",
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"text": "After analysing the annotation output, the quality checker returns details about five error types:",
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"text": "\u2022 Spans that have been selected but not labeled;",
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"text": "\u2022 Smell words with double annotation, which have not been linked to themselves; 2",
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"text": "\u2022 Frame elements that despite being annotated are not linked to any other element in text;",
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"text": "\u2022 A Smell_Word is the starting point of a relation instead of the ending point;",
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"text": "2 There are instances where the same token can be at the same time a Smell_Word and another frame element related to the Smell_Word itself. For instance, 'odoriferous' may be both a Smell_Word and a Quality. In these cases, a relation should be set between the FE label and the smell word. This error notifies the absence of this relation.",
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"text": "\u2022 Frame elements connected to something other than a Smell_Word.",
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"text": "Given the complexity of the annotation, for all languages involved the quality check step has been very useful to identify formal mistakes, allowing the removal of dozens of inconsistencies.",
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"text": "Having at least two annotators for each language is necessary to obtain a double annotation of a subset of the benchmark and compute inter-annotator agreement, which is commonly considered a measure of annotation quality (Artstein and Poesio, 2008) .",
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"text": "INCEpTION contains an integrated set of tools to compute inter-annotator agreement. 3 Among the proposed metrics, the most suitable for our task is Krippendorff's alpha (Krippendorff, 2011) , as it supports more than two annotators (that is the case for some of the languages). This measure considers also partial overlaps, e.g. one annotator labelled only a noun while the other included also its article.",
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"text": "Inter-annotator agreement between two raters was computed, usually over a set of around 200 annotations (both FEs and smell words). In general, this was carried out after an extensive ini- tial training of annotators. Agreement is 0.68 for English, 0.56 for Slovenian, 0.62 for French and 0.74 for Italian. For the other languages the process is still ongoing. In general, the major sources of disagreement are the extent of FE spans, a rather long distance between a FE and a smell word and possible different interpretations of some roles, in particular Location vs. Circumstances and Smell source vs. Odour carrier. While annotation guidelines were updated to make these distinctions clearer, some cases of disagreement are still very much dependent on annotators' preferences and interpretation.",
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"text": "In this section, we detail the content of our benchmark in each language. Table 3 shows the number of occurrences of smell words and frame elements. Overall, for each language a good number of smell-related events and situations were annotated. The average number of frame elements (FEs) associated with each smell event is between 2.1 and 2.7 for all languages, showing an interesting common feature. Furthermore, the most frequent FE is the Smell Source, followed by the Quality for all languages. This shows a pattern in the way smell situations and events are typically described, where the source and the quality are clearly core elements that are necessary to characterise the scene.",
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"text": "The FE element with the least annotations is instead 'Creator'. This is due to the fact that this role was added at a later stage in the annotation process, mainly to cover documents related to perfumery. It is therefore present only in the benchmarks that contain this kind of documents. For further discussion see Section 8.",
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"text": "In Figure 2 , we report the number of documents per domain in each language-specific benchmark (see list of domains in Section 4). Overall, we observe a prevalence of literary texts (LIT), probably because this is the most represented domain in large repositories such as Wikisource and Project Gutenberg. Travel literature and medical texts are also well-represented in all languages. Despite the effort to have a balanced benchmark covering the same domains in all languages, however, results are mixed. For some languages, well-represented in large digital repositories, this balance was possible to some extent, with English being the only one covering all domains. For other languages, the benchmarks are affected by the limited variety of resources available in digital format, see for example Slovenian. Availability is a major obstacle when trying to create historical corpora that cover different domains.",
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"text": "In Figure 3 , we report the temporal distribution of the documents present in the benchmark for each language. All languages overlap in the time period of interest, with the Dutch benchmark including some earlier texts but no data after 1880, and the Italian dataset going beyond 1930. Similar to the above remarks, also in this case we observe that, due to different data availability, not all time periods are covered equally. One of the goals of this benchmark is to enable temporal-aware information extraction tasks related to the olfactory domain. As a first step in this direction, we explore sentence classification using the English benchmark. Since our corpus consists of historical documents, we evaluate performance of a transformer model that is pre-trained using historical corpora, in light of Lai et al. (2021) 's proposal. We focus on the task of classifying sentences as smell-related or not. Since the corpus is annotated at token level, we first label the sentences that contain any smell event annotation as smell-related, which are 897 out of the total 3,141 sentences. We randomly choose 650 (190 smell-related, 460 not smell-related) sentences as a held-out to measure the performance of fine-tuning on the remaining 2,491 sentences.",
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"text": "We compare the performance obtained using BERT base uncased with sequence length 128 4 (Devlin et al., 2019) , RoBERTa base casesensitive with sequence length 512 5 (Liu et al., 2019) , and MacBERTh (Manjavacas and Fonteyn, 2021) 6 to identify sentences that are smell-related in English. MacBERTh is a BERT variant that is uncased with sequence length 128 and pre-trained from scratch using historical corpora. Each model was fine-tuned five times using five different ran-dom seeds (42, 43, 44, 45, 46) for all random aspects of the fine-tuning, batch size of 64, sequence length of 64, learning rate (2e-5), epochs (30), and random splitting for obtaining a development set from the training set (.15). Table 4 demonstrates the median performance of each fine-tuned model in terms of Matthews Correlation Coefficient (MCC), Precision, Recall, and F1-macro on the held-out dataset. We observe that macBERTh, which was pretrained using historical data, outperforms the base transformer models BERT and RoBERTa. This confirms the need to build models that are temporal-aware when dealing with historical corpora. Furthermore, the performance achieved by all models is above 0.90, showing that it is possible to yield good results in the task even if using relatively few training data. We analyzed the predictions of the best RoBERTa and MacBERTh models on 300 test sentences divided into two groups: the first one includes test sentences from documents published between 1619 and 1846, while the second covers the time period between 1847 and 1925. The F1-macro obtained with the MacBERTh model is 95.40 and 90.46 for the earlier (1619-1846) and later periods respectively. The RoBERTa model achieves 92.46 and 91.42 F1-macro in the same setting. Although the MacBERTh model yields significantly better results for data published in the earlier period, the RoBERTa model yields a balanced performance across periods.",
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"text": "During the creation of the benchmark, we have encountered two major issues related to working with historical data. The first, already mentioned in Section 6, is the limited availability of documents for some languages, domains and time spans. This has affected the possibility to create balanced benchmarks for all six languages, although a remarkable effort was put in manually looking for digital collections and selecting relevant documents.",
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"text": "Another major issue was the need to clean or correct some of the texts before the annotation, mostly due to the limits of OCR applied to old documents. Problematic transcriptions can be connected in part to stains or other imperfections in the paper, and in part to the evolution of language, with older documents presenting letters that have fallen into disuse in contemporary language. For instance, in French, Italian and English we found lost characters (e.g. long s \" \", often confused with \"f\" as in \"perfumes\", misspelled as \"persumes\" in English), characters used differently (v instead of u, like in \"vne\" for French, or \"vlcers\" for English), changes in word spelling (\"pourquoy\" instead of \"pourquoi\" in French), and abandoned words.",
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"text": "Another interesting element is that annotation guidelines were adapted several times during the benchmark creation process, because it was not possible to foresee all potential issues we encountered during annotation. Indeed, domain specificity of some texts and the different use of language in historical documents made it difficult to straightforwardly follow annotation instructions. For example, frame element definitions have been adjusted and the 'Creator' element was added. Furthermore, the initial list of lexical units (Table 1) was extended in the process, enabling annotators to add new terms encountered during manual labelling.",
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"text": "In this paper, we presented a multilingual benchmark annotated with smell-related information and covering six languages, which we make available to the research community. We have described the document selection rationale, the annotation process and the main challenges related to the creation of a multilingual benchmark containing historical documents. Annotation of Latin is in progress, and it will be added to the benchmark as soon as it is complete.",
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"section": "Conclusion and Future Work",
"sec_num": "9"
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"text": "The benchmark is only a first step towards the analysis and extraction of olfactory information from historical documents. The work introduced in Section 7 will be extended to all six languages, using historical BERTs when available. Furthermore, we will go beyond simple sentence classification, training multilingual classifiers to iden-tify lexical units and frame elements. Since the size of the benchmark is rather limited, we will try to expand it in the future but also explore semisupervised, few-shot and cross-lingual approaches to olfactory information extraction.",
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"section": "Conclusion and Future Work",
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"text": "Document selectionIn close collaboration with cultural historians, we defined ten domains of interest, where we expected to find a high number of smell-related",
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"text": "More details about this function are documented at https://inception-project.github.io/ releases/20.2/docs/user-guide.html#sect_ monitoring_agreement",
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"text": "https://huggingface.co/ bert-base-uncased, accessed on February 27, 20225 https://huggingface.co/roberta-base, accessed on February 27, 20226 https://www.github.com/emanjavacas/ macberth-eval, accessed on February 27, 2022.",
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"back_matter": [
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"text": "This research has been supported by the European Union's Horizon 2020 program project ODEUROPA 7 under grant agreement number 101004469.",
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"ref_entries": {
"FIGREF0": {
"uris": null,
"text": "Screenshot of the INCEpTION annotation tool",
"type_str": "figure",
"num": null
},
"FIGREF1": {
"uris": null,
"text": "Number of documents per domain in each language-specific benchmark. HOUS = Household & Recipes, LAW = Law, LIT = Literature, MED = Medicine & Botany, OTH = Other, PER = Perfumes & Fashion, PUB = Public health, REL = Religion, SCIE = Science & Philosophy, THE = Theatre, TRAV = Travel & Ethnography.",
"type_str": "figure",
"num": null
},
"FIGREF2": {
"uris": null,
"text": "Temporal distribution of documents in each language-specific benchmark 7 Towards smell related information extraction",
"type_str": "figure",
"num": null
},
"TABREF0": {
"html": null,
"content": "<table><tr><td>documents. These domains are: Household</td></tr><tr><td>&amp; Recipes, Law and Regulations, Literature,</td></tr><tr><td>Medicine &amp; Botany, Perfumes &amp; Fashion, Pub-</td></tr><tr><td>lic health, Religion, Science &amp; Philosophy, The-</td></tr></table>",
"text": "Initial list of possible lexical units for each language of interest. We list under Other the terms that were initially not included because they are ambiguous, but that were annotated as lexical units during benchmark creation.",
"num": null,
"type_str": "table"
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"TABREF1": {
"html": null,
"content": "<table/>",
"text": "Frame Element Example Sentence Smell SourceThe person, object or place that has a specific smell.The odour [of tar] and [pitch] was so strong. Odour Carrier The carrier of an odour, either an object (e.g. handkerchief) or atmospheric elements (wind, air) The unpleasant smell [of the vapour] of linseed oil extended for a considerable distance. Quality A quality associated with a smell and used to describe it. Earth has a [strong], [aromatic] odour. Perceiver The being that perceives an odour, who has a perceptual experience, not necessarily on purpose. The scent is described by [Dr. Muller] as delicious. Evoked Odorant The object, place or similar that is evoked by the odour, even if it is not in the scene. In offensive perspiration of the feet [a peculiar cabbage-like] stench is given off. Location The location where the smell event takes place. And, particularly, [at the foot of the garden], where he felt so very offensive a smell that has sickened him. Time An expression describing when the smelling event occurred. Galeopsis smells fetid [at first handling], [afterwards] aromatic. Circumstances The state of the world under which the smell event takes place. [When stale] the lobster has a rank stench. Effect An effect or reaction caused by the smell. An ill smell [gives a nauseousness]. Creator The person that creates a (usually pleasant) smell. The origin of perfume is commonly attributed [to the ancient Egyptians].",
"num": null,
"type_str": "table"
},
"TABREF2": {
"html": null,
"content": "<table/>",
"text": "Overview of the Frame Elements (FEs) related to Olfactory situations and events with corresponding examples. Lexical units are underlined and the FE of interest is in square brackets. The same definitions hold for all languages included in the benchmark. For more details on FEs descriptions see(Tonelli and Menini, 2021).",
"num": null,
"type_str": "table"
},
"TABREF4": {
"html": null,
"content": "<table/>",
"text": "Overview of benchmark content for each language.",
"num": null,
"type_str": "table"
},
"TABREF6": {
"html": null,
"content": "<table/>",
"text": "Median scores in terms of Mathews Correlation coefficient (MCC) and macro precision, recall, and F1 over five runs",
"num": null,
"type_str": "table"
}
}
}
}