4,375 research outputs found
Is a Dataframe Just a Table?
Get PDFQuerying data is core to databases and data science. However, the two communities have seemingly different concepts and use cases. As a result, both designers and users of the query languages disagree on whether the core abstractions - dataframes (data science) and tables (databases) - and the operations are the same. To investigate the difference from a PL-HCI perspective, we identify the basic affordances provided by tables and dataframes and how programming experiences over tables and dataframes differ. We show that the data structures nudge programmers to query and store their data in different ways. We hope the case study could clarify confusions, dispel misinformation, increase cross-pollination between the two communities, and identify open PL-HCI questions
Smooth Calibration and Decision Making
Get PDFCalibration requires predictor outputs to be consistent with their Bayesian posteriors. For machine learning predictors that do not distinguish between small perturbations, calibration errors are continuous in predictions, e.g. smooth calibration error [Foster and Hart, 2018], distance to calibration [Błasiok et al., 2023]. On the contrary, decision-makers who use predictions make optimal decisions discontinuously in probabilistic space, experiencing loss from miscalibration discontinuously. Calibration errors for decision-making are thus discontinuous, e.g., Expected Calibration Error [Foster and Vohra, 1997], and Calibration Decision Loss [Hu and Wu, 2024]. Thus, predictors with a low calibration error for machine learning may suffer a high calibration error for decision-making, i.e. they may not be trustworthy for decision-makers optimizing assuming their predictions are correct. It is natural to ask if post-processing a predictor with a low calibration error for machine learning is without loss to achieve a low calibration error for decision-making. In our paper, we show post-processing an online predictor with ε distance to calibration achieves O(√{ε}) ECE and CDL, which is asymptotically optimal. The post-processing algorithm adds noise to make predictions differentially private. The optimal bound from low distance to calibration predictors from post-processing is non-optimal compared with existing online calibration algorithms that directly optimize for ECE and CDL
Correspondence: from Wu Shanzhuan to Prof. Zhou Yan
Get PDFThis correspondence is written from the artist Wu Shanzhuan to Professor Zhou Yan. Written in Chinese, the letter mainly includes a list of artworks related to the “Red Humor International” series, which is an installation art situated at Zhejiang. Title, date and material and notes about specific artwork is provided in this letter. (Yifan Shang ‘25)https://digital.kenyon.edu/zhoudocs/1337/thumbnail.jp
Exhibition Catalog: WU SHAOXIANG in Europe (1988-1993)
Get PDFThis exhibition catalog, titled WU SHAOXIANG in Europe 1988-1993 , was published by the Austrian Art Association in Austria in April 1993. It consisted of a foreword, a preface, critiques about the artist\u27s works, an artist\u27s biography, and photos of sculptures and paintings created by the artist while he was in Europe from 1988 to 1993. (Yifan Shang \u2725)https://digital.kenyon.edu/zhoudocs/1485/thumbnail.jp
NUEVOS INMIGRANTES CHINOS EN CHILE: ESTUDIO DE CASO EN JIANGMEN DESDE LA TEORÍA DEL CAPITAL
No full textFil: Wu, Yifan. Universidad de Barcelona; España.A partir de la investigación de campo, fuentes orales y una amplia bibliografía, el objetivo de este artículo es rastrear los antecedentes, motivos, formas de migración y modo de desarrollo de los nuevos inmigrantes procedentes de Jiangmen y llegados a Chile. Se sostiene que estos inmigrantes, que carecían de capital económico y capital cultural, obtuvieron bienes económicos a través de la migración utilizando el capital social del que disponían. La larga historia de inmigración y los fuertes motivos para la emigración son la base para la formación del capital social de los inmigrantes. La inmigración dominada por el parentesco y la economía familiar reunida en la industria alimentaria china son el mecanismo de funcionamiento del capital social inmigrante. El capital económico y el capital simbólico son el objetivo de la conversión del capital social inmigrante
The Utilization of Social Media for E-commece
Get PDFIn recent years, the establishment and improvement of e-commerce and Internet platforms have been the development goals of various enterprises. At the same time, social media has gradually become an indispensable element in people's lives. So, this thesis mainly studies how companies should correctly use the huge attention and influence brought by social media to promote the continuous development of their e-commerce platforms. The first chapter explains in detail the core viewpoints and main research issues of this thesis. At the same time, the author also displays and analyzes the structure of the whole thesis, so that the logic of the whole thesis can be more clearly understood.
The theoretical part is mainly divided into two parts: e-commerce and social media. In addition to their respective basic concepts and extended knowledge, the author also analyzed the relationship between the two and the advantages and disadvantages of e-commerce platforms using social media for promotion. In the empirical research part, the author selected the Industrial and Commercial Bank of China Qingshan Sub-branch as the inspection object, and carried out investigation and analysis around its e-commerce platform "RONG e GOU". This paper adopts both quantitative and qualitative analysis, the purpose is to be able to formulate the results more reliable and effective. The author specifically uses two methods of platform user questionnaire and company management interview to conduct research and study.
At the end, the author analyzes in detail how the company uses social media to promote the e-commerce platform in general, and proposes a more targeted solution for the company. According to the results of the interviews with the company’s management and the questionnaires on the platform ’s customers, it is necessary for the company to make more innovations and trials in the use of social media, that is, to use a variety of social media for its own Platform for promotion. At the same time, the platform's own management system and regulations also need to be optimized, such as appropriately lowering the barriers to entry for shops and strengthening after-sales service capabilities
Partitioning parallel applications on multiprocessor reservations
No full textA full exploitation of the computational power available in a multicore platform requires the software to be specified in terms of parallel execution flows. At the same time, modern embedded systems often consist of more parallel applications with timing requirements, concurrently executing on the same platform and sharing common resources. To prevent reciprocal interference among critical activities, a resource reservation mechanism is highly desired in the kernel to achieve temporal isolation. In this paper, we propose a general methodology for abstracting the total computing power available on a multicore platform by a set of virtual processors, to allocate applications independently of the physical platform. The application, described as a set of tasks with precedence relations expressed by a directed acyclic graph, is automatically partitioned into a set of subgraphs that are selected to minimize either the overall bandwidth consumption or the required number of cores
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