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Exploring Conceptual Combination in Vision ∗ Building a bagpipe with a bag and a pipe: Exploring Conceptual Combination in Vision ∗ Sandro Pezzelle and Ravi Shekhar† and Raffaella Bernardi CIMeC - Center for Mind/Brain Sciences, University of Trento †DISI, University of Trento firstname.lastname @unitn.it { } Abstract This preliminary study investigates whether, and to what extent, conceptual combination is conveyed by vision. Work- ing with noun-noun compounds we show that, for some cases, the composed visual vector built with a simple additive model is effective in approximating the visual vector representing the complex concept. Figure 1: Can we obtain a clipboard by combining 1 Introduction clip and board with a compositional function f ? Conceptual combination is the cognitive process by which two or more existing concepts are com- in vision as the result of adding together two sin- bined to form new complex concepts (Wisniewski, gle concepts. That is, can the visual representa- 1996; Gagne´ and Shoben, 1997; Costello and tion of clipboard be obtained by using the visual Keane, 2000). From a linguistic perspective, this representations of a clip and a board as shown mechanism can be observed in the formation and in Figure 1? In order to investigate this issue, lexicalization of compound words (eg. boathouse, we experiment with visual features that are ex- swordfish, headmaster, etc.), a widespread and tracted from images representing concrete and im- very productive linguistic device (Downing, 1977) ageable concepts. More precisely, we use noun- that is usually defined in literature as the result noun compounds for which ratings of imageabil- of the composition of two (or more) existing and ity are available. The rationale for choosing NN- ˇ free-standing words (Lieber and Stekauer, 2009). compounds is that composition should take advan- Within both perspectives, scholars agree that the tage from dealing with concepts for which clear, composition of concepts/words is something more well-defined visual representations are available, than a simple addition (Gagne´ and Spalding, 2006; as it is the case of nouns (representing objects). In Libben, 2014). However, additive models turned particular, we test whether a simple additive model out to be effective in language, where they have can be applied to vision in a similar fashion to how been successfully applied to distributional seman- it has been done for language (Mitchell and Lap- tic vectors (Paperno and Baroni, to appear). ata, 2010). We show that for some NN-compounds Based on these previous findings, the present the visual representation of the whole can be ob- work addresses the issue of whether, and to what tained by simply summing up its parts. We also extent, conceptual combination can be described discuss cases where the model fails and provide conjectures for more suitable approaches. Since, ∗We are grateful to Marco Baroni and Aurelie´ Herbe- lot for the valuable advice and feedback. This project has to our knowledge, no datasets of images labeled received funding from ERC 2011 Starting Independent Re- with NN-compounds are currently available, we search Grant n. 283554 (COMPOSES). We gratefully ac- knowledge the support of NVIDIA Corporation with the do- manually build and make available a preliminary nation of the GPUs used in our research. dataset. 60 Proceedings of the 5th Workshop on Vision and Language, pages 60–64, Berlin, Germany, August 12 2016. c 2016 Association for Computational Linguistics 2 Related Works with an average score of at least 5 points in a scale ranging from 1 (e.g., whatnot: 1.04) to 7 (e.g., Recently, there has been a growing interest in watermelon: 6.95). From this subset, including combining information from language and vision. 240 items, one of the authors further selected only The reason lies on the fact that many concepts can genuine noun-noun combinations, so that items be similar in one modality but very different in like outfit or handout were discarded. We then the other, and thus capitalizing on both informa- queried each compound and its constituent nouns tion turns out to be very effective in many tasks. in Google images and we selected only those items Evidence supporting this intuition has been pro- for which every object in the tuple (eg. airplane, vided by several works (Lazaridou et al., 2015; air, and plane) had a relatively good visual rep- Johnson et al., 2015; Xiong et al., 2016; Ordonez resentation by looking at the top 25 images. This et al., 2016) that developed multimodal models step, in particular, was aimed at discarding the sur- for representing concepts that outperformed both prisingly numerous cases for which only noisy im- language-based and vision-based models in differ- ages (ie., representing brands, products, or con- ent tasks. Multimodal representations have been taining signs) were available. also used for exploring compositionality in visual objects (Vendrov et al., 2015), but compositional- From the resulting dataset, containing 115 ity was intended as combining two or more objects items, we manually selected those that we con- in a visual scene (eg., an apple and a banana) and sidered as compositional in vision. As a crite- not as obtaining the representation of a new con- rion, only NN-combinations that can be seen as cept based on two or more existing concepts. resulting from either combining an object with a Even though some research in visual composi- background (e.g., airplane: a plane is somehow tionality has been carried out for part segmenta- superimposed in the air background) or concate- tion tasks (Wang and Yuille, 2015), we focus on nating two objects (e.g., clipboard) were selected. a rather unexplored avenue. To our knowledge, Such a criterion is consistent with our purpose, the closest work to ours is represented by Nguyen that is finding those cases where visual composi- et al. (2014), who used a compositional model of tion works. The rationale is that there should be distributional semantics for generating adjective- composition when both the constituent concepts noun phrases (eg., a red car given the vectors of are present in the visual representation of the com- red and car) both in language and vision. Accord- posed one. Two authors separately carried out the ing to their results, a substantial correlation can selection procedure, and the few cases for which be found between observed and composed repre- there was disagreement were resolved by discus- sentations in the visual modality. Moving from sion. In total, 38 items were selected and included these results, the present study addresses the issue in what we will heceforth refer to as composi- of whether, and to which extent, a compositional tional group. Interestingly, the two visual crite- model can be applied to vision for obtaining noun- ria followed by the annotators turned out to partly noun combinations, without relying on linguistic reflect the kind of semantic relation implicitly ty- information. ing the two nouns. In particular, most of the se- lected items hold either a noun2 HAS noun1 (eg., 3 Dataset clipboard) or a noun2 LOCATED noun1 (eg., cup- cake) relation according to Levi (1978). To test our hypothesis, we used the publicly avail- able dataset by Juhasz et al. (2014). It contains In addition, 12 other compounds (eg., sun- 629 English compounds for which human ratings flower, footstool, rattlesnake, etc.) were ran- on overall imageability (ie., a variable measuring domly selected from the 115-item subset. We will the extent to which a compound word evokes a heceforth refer to this set as the control group, nonverbal image besides a verbal representation) whereas we will refer to the concatenation of the are available. We relied on this measure for car- two sets (38+12=50 items) as the full group. For rying out a first filtering of the data, based on the each compound in the full group, we manually assumption that the more imageable a compound, searched images representing it and each of its the clearer and better-defined its visual represen- constituents nouns in Google images. One good tation. As a first step, we selected the most im- image, possibly showing the most prototypical ageable items in the list by retaining only the ones representation of that concept according to the au- 61 thors’ experience, was selected. In total, 79 im- in image retrieval/matching task (Babenko et al., ages for N-constituents plus 50 images for NN- 2014) compared to other layers. For experimental compounds (129 in total) images were included in purpose, we used MatConvNet (Vedaldi and Lenc, our dataset.1 2015) toolbox for features extraction. 4 Model 4.2 Linguistic Features Each word in the dataset is represented by a In order to have a clear and interpretable picture of 400-dimension vector extracted from a semantic what we obtain when composing visual features of space2 built with the CBOW architecture imple- nouns, in this preliminary study we experimented mented in the word2vec toolkit (Mikolov et al., with a simple additive compositional model. Sim- 2013) and the best-performing parameters in Ba- ple additive models can be seen as weighting mod- roni et al. (2014). els applying the same weight to both elements in- volved. That is, when composing waste and bas- 5 Evaluation Measures ket, both nouns are considered as playing the same (visual) role with respect to the overall representa- To evaluate the compositionality of each NN- tion, ie. wastebasket. Intuitively enough, we ex- compound, we measure the extent to which the pect this function being effective in approximating composed vector is similar to the corresponding visual representations of complex concepts where observed one, ie. the vector directly extracted the parts are still visible (eg., clipboard). In con- from either texts or the selected image. Hence, trast, we don’t expect good results when the com- first of all we use the standard Cosine similar- position requires more abstract, subtle interactions ity measure.
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