603 research outputs found
Optical Diode Based on Two-Dimensional Photonic Crystal
The integrated optical diodes have been a thriving research theme due to their potential on-chip applications in photonic circuits for all-optical computing and information processing. Analogous to electronic counterparts, the unidirectional light propagation is characterized by the high contrast between forward and backward transmissions. In this chapter, we demonstrate the proposed schemes and designs for reciprocal and nonreciprocal optical diodes based on two-dimensional (2D) photonic crystal (PhC). The reciprocal devices are built by linear and passive PhC, and the spatial asymmetric mode conversion is utilized to achieve the unidirectionality. The presented nonreciprocal optical diodes rely on the optical nonlinearity of cavity. New 2D PhC optical diodes with high contrast ratio, low insertion loss, large operational bandwidth, small device footprint, and ease of fabrication are highly desirable and still pursued
Code-Style In-Context Learning for Knowledge-Based Question Answering
Current methods for Knowledge-Based Question Answering (KBQA) usually rely on
complex training techniques and model frameworks, leading to many limitations
in practical applications. Recently, the emergence of In-Context Learning (ICL)
capabilities in Large Language Models (LLMs) provides a simple and
training-free semantic parsing paradigm for KBQA: Given a small number of
questions and their labeled logical forms as demo examples, LLMs can understand
the task intent and generate the logic form for a new question. However,
current powerful LLMs have little exposure to logic forms during pre-training,
resulting in a high format error rate. To solve this problem, we propose a
code-style in-context learning method for KBQA, which converts the generation
process of unfamiliar logical form into the more familiar code generation
process for LLMs. Experimental results on three mainstream datasets show that
our method dramatically mitigated the formatting error problem in generating
logic forms while realizing a new SOTA on WebQSP, GrailQA, and GraphQ under the
few-shot setting.Comment: work in progres
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