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NLP-progress

Repository to track the progress in Natural Language Processing (NLP), including the datasets and the current state-of-the-art for the most common NLP tasks.

Word Sense Disambiguation

The task of Word Sense Disambiguation (WSD) consists of associating words in context with their most suitable entry in a pre-defined sense inventory. The de-facto sense inventory for English in WSD is WordNet. For example, given the word “mouse” and the following sentence:

“A mouse consists of an object held in one’s hand, with one or more buttons.”

we would assign “mouse” with its electronic device sense (the 4th sense in the WordNet sense inventory).

Fine-grained WSD:

The Evaluation framework of Raganato et al. 2017 [1] includes two training sets (SemCor-Miller et al., 1993- and OMSTI-Taghipour and Ng, 2015-) and five test sets from the Senseval/SemEval series (Edmonds and Cotton, 2001; Snyder and Palmer, 2004; Pradhan et al., 2007; Navigli et al., 2013; Moro and Navigli, 2015), standardized to the same format and sense inventory (i.e. WordNet 3.0).

Typically, there are two kinds of approach for WSD: supervised (which make use of sense-annotated training data) and knowledge-based (which make use of the properties of lexical resources).

Supervised: The most widely used training corpus used is SemCor, with 226,036 sense annotations from 352 documents manually annotated. All supervised systems in the evaluation table are trained on SemCor. Some supervised methods, particularly neural architectures, usually employ the SemEval 2007 dataset as development set (marked by *). The most usual baseline is the Most Frequent Sense (MFS) heuristic, which selects for each target word the most frequent sense in the training data.

Knowledge-based: Knowledge-based systems usually exploit WordNet or BabelNet as semantic network. The first sense given by the underlying sense inventory (i.e. WordNet 3.0) is included as a baseline.

The main evaluation measure is F1-score.

Supervised:

Model Senseval 2 Senseval 3 SemEval 2007 SemEval 2013 SemEval 2015 Paper / Source
MFS baseline 65.6 66.0 54.5 63.8 67.1 [1]
Bi-LSTMatt+LEX 72.0 69.4 63.7* 66.4 72.4 [2]
Bi-LSTMatt+LEX+POS 72.0 69.1 64.8* 66.9 71.5 [2]
context2vec 71.8 69.1 61.3 65.6 71.9 [3]
ELMo 71.6 69.6 62.2 66.2 71.3 [4]
GAS (Linear) 72.0 70.0 –* 66.7 71.6 [5]
GAS (Concatenation) 72.1 70.2 –* 67 71.8 [5]
GASext (Linear) 72.4 70.1 –* 67.1 72.1 [5]
GASext (Concatenation) 72.2 70.5 –* 67.2 72.6 [5]
supWSD 71.3 68.8 60.2 65.8 70.0 [6] [11]
supWSDemb 72.7 70.6 63.1 66.8 71.8 [7] [11]

Knowledge-based:

Model Senseval 2 Senseval 3 SemEval 2007 SemEval 2013 SemEval 2015 Paper / Source
WN 1st sense baseline 66.8 66.2 55.2 63.0 67.8 [1]
Babelfy 67.0 63.5 51.6 66.4 70.3 [8]
UKBppr_w2w-nf 64.2 54.8 40.0 64.5 64.5 [9] [12]
UKBppr_w2w 68.8 66.1 53.0 68.8 70.3 [9] [12]
WSD-TM 69.0 66.9 55.6 65.3 69.6 [10]

Note: The scores of [6,7] and [9] are not taken from the original papers but from the results of the implementations of [11] and [12], respectively.

[1] Word Sense Disambiguation: A Unified Evaluation Framework and Empirical Comparison

[2] Neural Sequence Learning Models for Word Sense Disambiguation

[3] context2vec: Learning generic context embedding with bidirectional lstm

[4] Deep contextualized word representations

[5] Incorporating Glosses into Neural Word Sense Disambiguation

[6] It makes sense: A wide-coverage word sense disambiguation system for free text

[7] Embeddings for Word Sense Disambiguation: An Evaluation Study

[8] Entity Linking meets Word Sense Disambiguation: A Unified Approach

[9] Random walks for knowledge-based word sense disambiguation

[10] Knowledge-based Word Sense Disambiguation using Topic Models

[11] SupWSD: A Flexible Toolkit for Supervised Word Sense Disambiguation

[12] The risk of sub-optimal use of Open Source NLP Software: UKB is inadvertently state-of-the-art in knowledge-based WSD