2016 ATypologyofSemanticRelationsDed

(Gábor et al., 2016) ⇒ Kata Gábor, Haïfa Zargayouna, Isabelle Tellier, Davide Buscaldi, and Thierry Charnois. (2016). “A Typology of Semantic Relations Dedicated to Scientific Literature Analysis.” In: Proceedings of Semantics, Analytics, Visualisation: Enhancing Scholarly Data Workshop (SAVE-SD 2016).

Subject Headings: Scholarly Literature Analysis, TermSuite.

Notes

Cited By

http://scholar.google.com/scholar?q=%222016%22+A+Typology+of+Semantic+Relations+Dedicated+to+Scientific+Literature+Analysis

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Abstract

We propose a method for improving access to scientific literature by analyzing the content of research papers beyond citation links and topic tracking. Our model relies on a typology of explicit semantic relations. These relations are instantiated in the abstract / introduction part of the papers and can be identified automatically using textual data and external ontologies. Preliminary results show a promising precision in unsupervised relationship classification.

1. Introduction

Compiling a state of the art is a fundamental activity for the understanding of any scientific research field. This activity requires the analysis of the existing literature to identify the involved concepts and actors and track relevant topics. Chavalarias and Cointet [3], Herrera et al. [8] or Skupin [17] work on analyzing and visualizing the evolution of topics over time. Citation links are extensively used to explore scientific communities [12,13]. [6] provides a list of usual tasks on bibliographies for different classes of users. The Citation Typing ontology (CiTo) [1] presents a typology of citations according to the relation between the research papers they express.

Citations alone, however, are not enough to fully understand the evolution of a research field: researchers need to analyze the contribution of individual papers. Such an analysis is focused on specific concepts and relations, for instance to identify that a method has been developed to tackle some problem, that a refinement of an existing solution has been developed, etc. For this purpose, we need to (i) identify the entities and concepts that describe a scientific field (method, problem) and (ii) identify the semantic relations between these entities (tackle, developed). Doing so, we will build semantic links between articles that go much beyond explicit citations. Hence, the definition and identification of the relevant semantic relations is at the core of our approach.

We combine natural language processing techniques with statistical term extractors and external ontological resources. Ontologies allow a fine-tuned semantic analysis, as opposed to Open Information Extraction [5] or general-purpose approaches exploiting terminology extraction on the fly [11, 3, 12, 17]. In particular, systems using an ontology can benefit from various typed relations. As a corpus of scientific texts, we use the ACL Anthology Corpus [15] and we focus on the “abstract” and "introduction " sections, as they provide the most informative description of the content of a paper. However, our approach does not rely on manually annotated data and aims to be domain-independent: the semantic relations considered are generic for any scientific field.

Section 2 introduces the main architecture of our model for semantic analysis. Section 3 proposes a typology of the semantic relations in the scientific domain, while section 4 briefly exposes the methodology by which this model has been instantiated. Finally, section 5 draws some conclusions and perspectives for future work.

2 General model

Our purpose is to automatically extract relevant semantic relations in the science/engineering domain, as they appear in texts such as "a (new) method is proposed for a task", or "a phenomenon is found in a certain context”. By identifying concepts and semantic relations between concepts, we can detect research papers which deal with the same problem, or track the evolution of results on a certain task. Our model of the scientific domain contains scientific articles linked to typed relations whose arguments are mapped to existing ontologies (see Figure 1).

The process used to implement the model consists of three sub-tasks: entity annotation, concept mapping and relation classification. Entity annotation is the task of recognizing instances of domain concepts in the text. Concept mapping consists in finding mappings with external ontologies or vocabularies. Relation classification uses the entity-annotated text as input and aims to identify the relations between two entities based on a combination of two information sources: the text sequence between the two entities (extracted from the corpus), and the semantic type of the entities (extracted from the ontology). We are currently experimenting with an iterative process: after annotating concepts in the corpus, we extract sequential patterns, which are used to identify instances of known relations and to discover new types of relations. A further goal is to enrich ontologies with new relation types [14].

…

3 Semantic Relations in Scientific Literature

A data-driven approach was adopted to discover relation types represented in the corpus. Our corpus contains 4.200.000 words from 11.000 papers (abstracts and introductions) in the ACL Anthology Corpus, pre-processed by E. Omodei [11 ]. A sample of 100 abstracts was extracted and instances of explicit semantic relations were discovered and manually annotated on these data. Pattern-based approaches of relationship extraction [1] and classification [18] rely on the hypothesis that the context of occurrence of entity mention pairs is characteristic of the semantic relation between the two concepts. Thus, only linguistically explicit relations were taken into account. On the textual level, a semantic relation is conceived as a text span linking two annotated instances of concepts within the same sentence (see the example above). On the semantic level, relation types need to be specific enough to be easily distinguished from each other by a domain expert. Argument types are very informative when specifying a relation. Instances of arguments are typically domain-specific (e.g. the kind of data or resources are different across domains), hence, the link is ensured by mapping the entities to external ontologies. Table 1 provides the typology of relations that has been defined, together with argument type specifications. Table 2 shows how the various types of semantic relations are represented in this corpus.

affects ARG1: specific property of data ARG2: results
based_on: ARG1: method, system based on ARG2: other method
char ARG1: observed characteristics of an observed ARG2: entity
compare ARG1: result (of experiment) compared to ARG2: result2
composed_of ARG1: database/resource ARG2: data
datasource ARG1: information extracted from ARG2: kind of data
method_applied ARG1: method applied to ARG2: data
model ARG1: abstract representation of an ARG2: observed entity
phenomenon ARG1: entity, a phenomenon found in ARG2: context
problem ARG1: phenomenon is a problem in a ARG2: field/task
propose ARG1: paper/author presents ARG2: an idea
study ARG1: analysis of a ARG2: phenomenon
tag ARG1: tag/meta-information associated to an ARG2: entity
task_applied ARG1: task performed on ARG2: data
used_for ARG1: method/system ARG2: task
uses_information ARG1: method relies on ARG2: information
yields ARG1: experiment/method ARG2: result
wrt ARG1 a change in/with respect to ARG2: property

Table 1. Semantic relation typology based on 100 abstracts

Relation Frequency in corpus
used_for 27%
composed_of 16%
propose 11%
yields 6%
study 6%
task_applied 5%
uses_information 4%
affects 4%

Table 2. Most frequent relations in manually annotated abstracts

The typology was set up on the basis of examples from the 100 abstracts. As a next step, we selected a sample of 500 abstracts to be manually annotated using the current typology. The agreement rate between the annotators will indicate whether the relations are well defined on the semantic level (possible to classify), and whether they are indeed explicit on the textual level (possible to annotate). In case of a successful validation, these data will serve to evaluate relationship extraction and classification experiments.

4 Model instantiation

Entity annotation was applied to the corpus of 4.2 million words in two steps. First, candidates were generated with the terminology extraction tool TermSuite [4 ]. The list of extracted terms was then mapped to different ontological resources: the knowledge base of Saffron Knowledge Extraction Framework [2], and the BabelNet ontology [10 ]. If a term was validated as a domain concept (i.e., found in at least one of the resources), it was annotated in the text. The complete process of entity annotation is described in [7].

A first set of unsupervised, pattern-based clustering experiments was performed to detect semantic relations. First, entity mention pairs were extracted from the corpus, together with the sequences. A co-occurrence matrix was built from entity pairs and sequences. The matrix rows (entity pairs) were clustered using CLUTO’s [9] divisive algorithm with repeated bisections. As we are experimenting with completely unsupervised methods, the number of clusters to detect was not fixed to the number of relations in our typology. The reported evaluation was carried out on a set of 700 entity pairs, manually classified to one or more of the semantic relations we defined. Table 3 summarizes the results compared to a random clustering baseline. Precision and recall are calculated in terms of pairs of items correctly or falsely assigned to the same cluster or to different clusters.

Input #clusters Precision Recall F-measure
baseline 100 0.095 0.009 0.017
baseline   50 0.103 0.019 0.033
baseline   25 0.104 0.041 0.058
Sequences 100 0.490 0.046 0.084
Sequences  50 0.378 0.079 0.132
Sequences  25 0.313 0.140 0.193
Table 3. Evaluation of clustering

5 Conclusion

We presented a model for the analysis of scientific papers in order to automatically extract states of the art of a research field. The core of the model is a typology of semantic relations in the scientific domain, which was defined while manually annotating data from a corpus of natural language processing papers. These relations can be identified automatically using a combination of pattern mining and natural language processing techniques. The first results on recognizing relations between unseen concepts are already very encouraging: a precision of 0.5 means that one out of two pairs of concepts assigned to the same category belong to the same semantic relation (among 18 distinct possible ones). Experiments are currently being carried out with bi-clustering algorithms, where text sequences and concept pairs are clustered at the same time.

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	Author	volume	Date Value	title	type	journal	titleUrl	doi	note	year
2016 ATypologyofSemanticRelationsDed	Isabelle Tellier Davide Buscaldi Thierry Charnois Kata Gábor Haïfa Zargayouna			A Typology of Semantic Relations Dedicated to Scientific Literature Analysis						2016