1,055 research outputs found
UniTabE: Pretraining a Unified Tabular Encoder for Heterogeneous Tabular Data
Recent advancements in Natural Language Processing (NLP) have witnessed the
groundbreaking impact of pretrained models, yielding impressive outcomes across
various tasks. This study seeks to extend the power of pretraining
methodologies to tabular data, a domain traditionally overlooked, yet
inherently challenging due to the plethora of table schemas intrinsic to
different tasks. The primary research questions underpinning this work revolve
around the adaptation to heterogeneous table structures, the establishment of a
universal pretraining protocol for tabular data, the generalizability and
transferability of learned knowledge across tasks, the adaptation to diverse
downstream applications, and the incorporation of incremental columns over
time. In response to these challenges, we introduce UniTabE, a pioneering
method designed to process tables in a uniform manner, devoid of constraints
imposed by specific table structures. UniTabE's core concept relies on
representing each basic table element with a module, termed TabUnit. This is
subsequently followed by a Transformer encoder to refine the representation.
Moreover, our model is designed to facilitate pretraining and finetuning
through the utilization of free-form prompts. In order to implement the
pretraining phase, we curated an expansive tabular dataset comprising
approximately 13 billion samples, meticulously gathered from the Kaggle
platform. Rigorous experimental testing and analyses were performed under a
myriad of scenarios to validate the effectiveness of our methodology. The
experimental results demonstrate UniTabE's superior performance against several
baseline models across a multitude of benchmark datasets. This, therefore,
underscores UniTabE's potential to significantly enhance the semantic
representation of tabular data, thereby marking a significant stride in the
field of tabular data analysis.Comment: 9 page
2-ChloroÂmethyl-1-methyl-1,3-benzimidazole
The title compound, C9H9ClN2, was prepared from the reaction of N-methylÂbenzene-1,2-diamine and 2-chloroÂacetic acid in boiling 6 M hydroÂchloric acid. The benzimidazole unit is approximately planar, the largest deviation from the mean plane being 0.008 (1) Å. The Cl atom is displaced by 1.667 (2) Å from this plane. The methyl group is statistically disordered with equal occupancy
Graphene Acoustic Devices
In 2011, Ren’s group has developed the first graphene sound source device in the world. This is the first time that the graphene applications have been extended into acoustic area. The graphene sound source can produce sound in a wide sound frequency range from 100 Hz to 50 kHz. After that, we have innovated the first graphene earphone, which can be used both for human and animals. In 2017, both the sound detection and sound emission have been integrated into one graphene device, which is called graphene artificial throat. In this book chapter, more details for developing those graphene acoustic devices will be introduced, which can help to boost the real applications of graphene devices
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