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| "paper_id": "2021", |
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| "date_generated": "2023-01-19T01:13:31.705308Z" |
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| "title": "Reference and coreference in situated dialogue", |
| "authors": [ |
| { |
| "first": "Sharid", |
| "middle": [], |
| "last": "Lo\u00e1iciga", |
| "suffix": "", |
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| "institution": "University of Potsdam", |
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| "country": "Germany" |
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| "email": "" |
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| { |
| "first": "Simon", |
| "middle": [], |
| "last": "Dobnik", |
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| "institution": "University of Gothenburg", |
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| "country": "Sweden" |
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| "email": "simon.dobnik@gu.se" |
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| { |
| "first": "David", |
| "middle": [], |
| "last": "Schlangen", |
| "suffix": "", |
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| "institution": "University of Potsdam", |
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| "country": "Germany" |
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| "email": "david.schlangen@uni-potsdam.de" |
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| "abstract": "In recent years, a large number of corpora have been developed for vision and language tasks. We argue that there is still significant room for corpora that increase the complexity of both visual and linguistic domains and which capture different varieties of perceptual and conversational contexts. Working with two corpora approaching this goal, we present a linguistic perspective on some of the challenges in creating and extending resources combining language and vision while preserving continuity with the existing best practices in the area of coreference annotation.", |
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| "abstract": [ |
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| "text": "In recent years, a large number of corpora have been developed for vision and language tasks. We argue that there is still significant room for corpora that increase the complexity of both visual and linguistic domains and which capture different varieties of perceptual and conversational contexts. Working with two corpora approaching this goal, we present a linguistic perspective on some of the challenges in creating and extending resources combining language and vision while preserving continuity with the existing best practices in the area of coreference annotation.", |
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| "text": "With the ease of combining representations from different modalities provided by neural networks, text and vision are coming together. There is a growing body of resources addressing a setting in which the visual context can be exploited to support a textual task, for example visual coreference resolution.", |
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| "section": "Introduction", |
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| "text": "Several corpora have been developed in the domain of vision and language (V&L), for example corpora of image captions (Lin et al., 2014; Young et al., 2014; , images and paragraph descriptions (Krause et al., 2017) , visual question answering (Antol et al., 2015) , visual dialogue (Das et al., 2017) and embodied question answering (Das et al., 2018) . Through these the V&L research has progressively moved from sentence descriptions to descriptions involving utterances and conversations, therefore adding complexity to their semantic representations. In parallel to the corpora, V&L systems have been developed but of course these are limited by the complexity of the task for which the dataset has been collected. The end goal of the current research is to move to a more complex linguistic setting involving multiparty dialogue and visual representations that go beyond individual images.", |
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| "text": "Situated reference resolution involves grounding linguistic expressions in perceptual representations (Harnad, 1990) . Coreference resolution, traditionally a textual task, involves linking linguistic expressions referring to the same discourse entities (Stede, 2012) . While challenging, the task is defined by the familiar nature of written texts: linear, planned and structured; defining thus the coreference mechanisms and devices found in them. In resources combining V&L, however, the textual part is often a dialogue or pairs of question-answers. As a result, the coreference devices differ considerably from those found in texts and are closer to actual conversations whereby people create reference to entities on the fly. This of course comes with its own challenges, but there are also some relations made easier since they can be grounded in the image.", |
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| "text": "As V&L come together, there is therefore an increased need for extending resources for the task of visual coreference resolution. This means engaging with the challenges along two axes:", |
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| "text": "\u2022 Dialogue: built by two speakers who each have their own mental state and cognitive process but who are communicating through referring expressions which are projected in the same conversation. \u2022 Shared physical context: simultaneous access to an image or other perceptual context which enables non-linear references to it. Instead, the reference is guided by visual attention. We present a linguistic perspective on these challenges by analysing a pilot annotation of two situated dialogue corpora: the Cups corpus (Dobnik et al., 2020) and the Tell-me-more corpus (Ilinykh et al., 2019) , shown below in Figure 1 and example (1) respectively. Starting from the annotation scheme for several textual coreference datasets (Artstein and Poesio, 2006; Pradhan et al., 2007; Uryupina et al., 2019) , this exercise proved useful to pinpoint in what ways the purely textual doc-ument scenario is different from the domain of embodied interaction.", |
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| "text": "The first corpus contains a conversation between two participants over an almost identical visual scene involving a table and cups where participants have different locations (Figure 1 ). Some cups have been removed from each participant's view and they are instructed to discuss over a computer terminal in order to find the cups that each does not see. The Tell-me-more corpus consists of images accompanied with a small text of five complete sentences, collected by asking participants to describe the image to a friend, successively adding details. The genre of these texts is therefore mixed: in between standard text (as found in news text for example) and dialogue data which reflects the features found in conversations rather than written conventions.", |
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| "text": "These corpora are complementary as Cups gives us accurate visual ground truth information with free and unrestricted dialogue, while Tell-me-more offers a richer unrestricted image with short and task constrained (pseudo-)dialogues.", |
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| "text": "In this paper, we discuss a number of cases from these corpora that challenge both standard language grounding annotations as well as standard coreference annotation. This work points thus towards required future work in creating (co)reference annotation schemes that can handle situated dialogue.", |
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| "text": "Pointing to the inability of NLP tools to handle the textual part in situated dialogue, early works had described the need to ground the dialogue in the image in a manner informed by linguistics (Byron, 2003) .", |
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| "text": "As content develops in a text, entities are introduced and re-mentioned, establishing discourse referents. The context is provided by the document and no extra-linguistic reference is needed for resolving the reference to an entity (Karttunen, 1969) . In situated dialogue, on the other hand, the visual modality brings the extra-linguistic context as a source of referents. Here, resolving references to entities can be thus achieved by either looking at the picture or by reading the discourse. Recording both strategies separately is crucial if we want to understand and model them soundly, in keeping with theories of cognitive processing (cf. (Kelleher et al., 2005) ). Extending the coreference annotation paradigm is thus the best bet although not a lot Textual coreference Annotated data for the coreference resolution task has mainly focused on news texts and concrete nouns, excluding reference to events and other coreferential relations such as bridging, deixis, and ambiguous items well documented in the linguistic literature but deemed infrequent or too difficult to process (Poesio, 2016). In contrast, there is a growing body of literature interested in phenomena beyond the nominal case (Kolhatkar et al., 2018; Nedoluzhko and Lapshinova-Koltunski, 2016) , resulting in new, although still small in size, annotated corpora (Lapshinova-Koltunski et al., 2018; Zeldes, 2017; Uryupina et al., 2020) .", |
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| "text": "Visual coreference Coreference work based on the popular VisDial dataset (Das et al., 2017) targets only a limited set of referential expressions, partly because it relies on automatic tools (Kottur et al., 2018; Yu et al., 2019) , which are known to be problematic with this genre. With a focus in grounded human interaction, there are corpora whose textual part comprises question answer pairs (Antol et al., 2015; Goyal et al., 2017) . Those, however, are short in nature, with few opportunities for re-mention of the different objects in the image and hence coreference. Last, corpora designed towards navigation and location (Stoia et al., 2008; Thomason et al., 2019) focusing on different kind of task and descriptions might be good candidates that could be explored and extended in a similar fashion as our corpora.", |
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| "text": "Referring expressions generation The goal in this area is to generate expressions over several turns of conversation in a natural and non-repetitive way, following principles of communicative discourse as for example in the recent PhotoBook dataset (Takmaz et al., 2020) . Our work is complementary to such undertakings as it focuses on the interpretative rather than generative part.", |
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| "text": "The notion of coreference chain-the sequence of mentions pointing to a same entity in a text-is central in coreference resolution. Built on top of the document as a unit, this notion relies on and in turn informs theories about accessibility hierarchy and salience of entities (Ariel, 1988 (Ariel, , 2004 Grosz et al., 1995) . In dialogue, however, references crisscross between the speakers and, one step further, in situated dialogue references crisscross between the speakers and the objects in the image. In this section we revise the annotation challenges in the annotation of anaphoric phenomena in data of this genre.", |
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| "text": "In spoken discourse people try their best to ground the references so they make sure they understand each other. To do so, they rely on the mechanisms of attention (Lavie et al., 2004) . Although most concrete references can be grounded to the image easily, there are also some difficult cases. References can be found to portions of the image without a bounding box, such as base of the tub in example (1).", |
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| "section": "Grounding and referentiality", |
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| "text": "(1)", |
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| "text": "1. This is a picture of a bathtub.", |
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| "text": "2. The tub is white.", |
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| "text": "3. The wall and base of the tub are brown. 4. The door appears to be glass. 5. There is a handrail on the side wall.", |
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| "text": "In the previous example the difficulty arises because the object detector failed to recognise the target object. However, referring expressions are referential to a different degree, e.g., \"Where are your blue ones?\" -is the speaker referring to a particular subset of blue cups, all the blue cups in the scene, blue cups in general, or not referring to any particular set of objects? The distinction is sometimes not clear. Last, as the image determines the scope of the referentiality, typical semantic properties are frequently used to refer back to the objects in the image: colour, shapes, sizes. These can be genuinely referential (a form of ellipsis) or used in an attributive manner. Compare for example white in the second sentence of (1), with (2) below.", |
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| "text": "(2) P1: closest to me, from left to right red, blue, white, red P2: ok, on your side I only see red, blue, white", |
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| "text": "Contrary to a Gricean-based analysis of spoken discourse, coherence-based theories of discourse do not traditionally take the cognitive state of the speaker as a necessary element to text interpretation (Bender and Lascarides, 2019) . In situated dialogue, however, although the image can be treated as the ground truth of the situation, the speaker's cognitive state has to be considered to disambiguate their utterances, the hearer makes a model of their beliefs, desires and intentions associated with the utterance. This is exemplified in the following excerpt from Cups where both participants do not see one of the two red cups close by, but each a differ-ent one. They mistakenly believe that there is only one missing red cup and this dis-alignment of their beliefs gradually leads to increasingly diverging cognitive states. ", |
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| "text": "We observe a common strategy of grouping things in order to refer to them collectively. This raises the question: What is the level of specification needed in a coreference annotation? One could think about this in linguistic terms, for instance mass nouns or sets; alternatively, in computer vision, there is the distinction between things and stuff (Caesar et al., 2018) .", |
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| "text": "In (4) below, is the reference to the curtains a case of a set composed by individual instances, or is it a mass noun? Note the curtains is a type of stuff in Caesar et al.'s work. (4) 1. I see a picture of an entertainment room. 2. there is a round table in the foreground and a fussball table in the middle of the room, as well as a pool table further back. 3. there is a sitting area with chairs facing a television set. 4. the room has several windows with green curtains. 5.the floors are made of a brown tile.", |
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| "text": "In (5) from Cups, on the other hand, the speakers refer to rows of objects even though these are not arranged in strict geometric lines. Hence, which objects are included is contextually defined and not always clear.", |
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| "text": "P2: ok, so your next row P2: you said there 's a takeaway cup somewhere marooned all alone P1: Okay. So we have that row I described with the now found red cup. Then a takeaway cup that is between that row and the next. It's very much in the middle of the two rows.", |
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| "section": "(5)", |
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| "text": "Different referring expressions have different properties and behaviour, an idea behind theories of salience and accessibility. They are based on the observation that some forms are used to introduce entities and some others to refer to them: some entities are discourse-new and some are discourseold. In situated dialogue, the image provides an additional context and source of referents, but it does not follow that the status of subsequent mentions is old. In the example below, the fact that the discourse starts with It is licensed by the image and this source of reference should be accounted for differently in the annotation than a genuine discourse-old case such as the it in sentence 2. 61. It s a well-lit kitchen with stainded [sic] wooden cupboards . 2. There's a microwave mounted over the stove, which has a red tea kettle on it. 3. The appliances are black and stainless steel in the kitchen. 4. The countertops look like they 're black granite. 5. The window has sunlight streaming in and it 's very brightly light.", |
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| "section": "Information status", |
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| "text": "V&L resources provide a unique opportunity to explore the notion of discourse entity in grounded context. Extending the coreference annotation to this domain is essential to understand the relationship between reference and coreference. The same mechanisms that humans adopt to solve coreference in the textual domain should underlay results in the V&L domain. Indeed, reference is underspecified in both modalities; any kind of information extraction from these domains will benefit from mechanisms that resolve this underspecification: capturing coreference is a door to capturing coherence. Furthermore, a rich annotation scheme leads to the development of corpora allowing the training of data driven systems for the V&L domain and social robotics.", |
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| "section": "Conclusions", |
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