Rethinking Attribute Representation and Injection for Sentiment Classification

Text attributes, such as user and product information in product reviews, have been used to improve the performance of sentiment classification models. The de facto standard method is to incorporate them as additional biases in the attention mechanism, and more performance gains are achieved by extending the model architecture. In this paper, we show that the above method is the least effective way to represent and inject attributes. To demonstrate this hypothesis, unlike previous models with complicated architectures, we limit our base model to a simple BiLSTM with attention classifier, and instead focus on how and where the attributes should be incorporated in the model. We propose to represent attributes as chunk-wise importance weight matrices and consider four locations in the model (i.e., embedding, encoding, attention, classifier) to inject attributes. Experiments show that our proposed method achieves significant improvements over the standard approach and that attention mechanism is the worst location to inject attributes, contradicting prior work. We also outperform the state-of-the-art despite our use of a simple base model. Finally, we show that these representations transfer well to other tasks. Model implementation and datasets are released here: https://github.com/rktamplayo/CHIM.Comment: EMNLP 201

Synthesizing aspect-driven recommendation explanations from reviews

National Research Foundation (NRF) Singapore under NRF Fellowship Programm

Museums, discourse, and visitors : the case of London's Tate Modern

This thesis examines the conceptualization of the visitor within the discursive construction of the contemporary public art museum. It takes the rhetorical formulation of the interaction between the theorized visitor figure and the discursively rendered museum to constitute the ‘visit’. This work argues that the position of the visitor within museum discourse has radically shifted in the past generation; the primary claim being that the visit is reconceived as a personally customizable experience less oriented toward the transfer of information from the curator (regarded as expert and educator) to the visitor figure (regarded as ignorant pupil), and more oriented toward meeting the particular needs and preferences of the visitor. This conception currently appears in museum discourse and in the minds of influential actors who shape this discourse. To analyze this claim, this thesis draws on the institutionalization of the visit via a case study of the Tate Modern museum, which provides the primary empirical evidence demonstrating the above claim. The resulting study relates the questions, structure, and findings of a systematic investigation into the historical, social, and museological conditions necessary to an institutionally manifested personalized, visitor-centered visit. The conceptual development of the visitor figure is traced through implicit accounts of the visit within academic studies of the museum, institutional records, marketing reports, advertisements, and the public discourse convened around Tate Modern’s opening thematic displays that served as an extension of Tate’s marketing and audience development programs. This visitor figure is now coextensive with and conditioned by a neoliberal participatory agenda that trades on the notion of personal agency and enlightened cultural consumption, which is, in turn, undergirded and conditioned by the intertwined forces of consumerism, marketing, and branding

The Smartpen as a Mediational Tool for Learning Language and Content Areas: The Case of English Learners in Mainstream Classrooms

The use of mobile devices for supporting the instruction of second language (L2) learners is an emerging and rapidly growing area of inquiry. Previous research on mobile assisted language learning (MALL) has concentrated on the development of isolated linguistic skills through a common set of mobile technologies, such as PDAs and iPods, with limited attention given to alternative mobile devices or situations of L2 learning that require the simultaneous learning of language and academic content (Wu, Jim Wu, Chen, Kao, Lin, & Huang, 2012; Viberg & Grönlund, 2012; 2013). In particular, little is understood about how English Learners (ELs) educated within mainstream classrooms choose to appropriate mobile technologies to meet their learning needs, with respect to both their development linguistically and across academic course disciplines. To inform this gap in research, this study used a quasi-ethnographic, instrumental case study design to explore how a group of middle school ELs used an understudied mobile device, the Echo Smartpen, to mediate their learning of language skills (e.g., speaking, reading, writing, listening, vocabulary) and of academic content areas (e.g., math, science, social studies). It also sought to examine how the Smartpen could assist ELs\u27 learning processes with respect to individual learner characteristics (e.g., affective, cognitive, metacognitive). To accomplish this purpose, multiple sources of data were collected from seven student participants, their English as a Second Language (ESL) specialist, and primary mainstream teacher. These sources consisted of technologically-mediated digital data, such as the students\u27 digitized notebooks, as well as traditional methods qualitative data collection, including individual and focus group interviews, and learning artifacts. The overall theoretical framework guiding the data analysis was Vygotskian sociocultural theory (SCT), complemented by grounded theory and the constant comparison coding method (Strauss & Corbin, 1990; 1998). Key principles for the analysis were the Vygotskian notions of mediated learning through physical and psychological tool use (Lantolf, 2000). Findings from this study provide insights about the process of mediated language and content learning with the Smartpen for ELs clustered around three major themes: 1) extended opportunities for language learning through self-constructed artifacts; (2) extended opportunities for content learning through co-constructed artifacts; and (3) extended learning self with the Smartpen. In addition to the main emergent themes, research findings incorporate the participant-based metaphorical concept of time travel as an important sub-thematic element in tracing ELs\u27 use of the Smartpen across temporal and educational contexts (e.g., school and home). Finally, this study concludes with a discussion of theoretical and pedagogical implications for the integration of mobile devices for ELs in mainstream settings, as well as with recommendations for future research deriving from this research