Contrastive Learning-based models have shown impressive performance in text-image retrieval tasks. However, when applied in video retrieval, traditional contrastive learning strategies have faced challenges in achievi...
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ISBN:
(纸本)9798400708688
Contrastive Learning-based models have shown impressive performance in text-image retrieval tasks. However, when applied in video retrieval, traditional contrastive learning strategies have faced challenges in achieving satisfactory results due to redundancy of video contents. We discern several potential reasons: (1)Current methodologies sometimes overlook the significant information imbalance between videos and query text, specifically neglecting the in-depth textual representation of the content within the videos. (2) Current video matching methodologies typically focus on cross-model alignment at general entity similarity level, without specific consideration for how entity pair preferences and similarity properties affect the task at hand. (3) Previous vectorized retrieval based on video content features have been somewhat flawed. They primarily focused on aligning overall features without having an video content tags feature for meaningful feature discrimination. Considering the shortcomings identified in the mentioned three aspects, we propose an ontology semantic lab.ls augments retrieval model and introduce a method to integrate video ontology semantic lab.ls into the contrastive learning framework. In particular, we have developed ontology semantic descriptions about entities encompassing both human figures and textual elements within the videos. Subsequently, we conducted training and testing on the CMIVQA dataset to assess the performance of our approach. The experimental results show that employing fine-grained ontology lab.ls as sample pairs for contrastive learning leads to an increased level of precision in video retrieval tasks.
Reasoning and knowledge-related skills are considered as two fundamental skills for natural language understanding (NLU) tasks such as machine reading comprehension (MRC) and natural language inference (NLI). However,...
Combining different forms of prompts with pre-trained large language models has yielded remarkable results on reasoning tasks (e.g. Chain-of-Thought prompting). However, along with testing on more complex reasoning, t...
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Laser state active controlling is challenging under the influence of inherent loss and other nonlinear effects in ultrafast *** an extension of degree of freedom in optical devices based on low-dimensional materials m...
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Laser state active controlling is challenging under the influence of inherent loss and other nonlinear effects in ultrafast *** an extension of degree of freedom in optical devices based on low-dimensional materials may be a way ***,the anisotropic quasi-one-dimensional layered material Ta2PdS6 was utilized as a saturable absorber to modulate the nonlinear parameters effectively in an ultrafast system by polarization-dependent *** polarization-sensitive nonlinear optical response facilitates the Ta2PdS6-based mode-lock laser to sustain two types of laser states,i.e.,conventional soliton and noise-like *** laser state was switchable in the single fiber laser with a mechanism revealed by numerical *** coding was further demonstrated in this platform by employing the laser as a codable light *** work proposed an approach for ultrafast laser state active controlling with low-dimensional material,which offers a new avenue for constructing tunable on-fiber devices.
Electromagnetic waves carrying orbital angular momentum(OAM),namely OAM beams,are important in various fields including optics,communications,and quantum ***,most current schemes can only generate single or several si...
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Electromagnetic waves carrying orbital angular momentum(OAM),namely OAM beams,are important in various fields including optics,communications,and quantum ***,most current schemes can only generate single or several simple OAM ***-mode OAM beams are rarely *** paper proposes a scheme to design metasurfaces that can generate multiple polarization-multiplexed OAM modes with equal intervals and intensities(i.e.,OAM combs)working in the terahertz(THz)*** a proof of concept,we first design a metasurface to generate a pair of polarization-multiplexed OAM combs with arbitrary mode ***,another metasurface is proposed to realize a pair of polarization-multiplexed OAM combs with arbitrary locations and intervals in the OAM *** results agree well with full-wave simulations,verifying a great performance of OAM combs *** method may provide a new solution to designing high-capacity THz devices used in multi-mode communicationsystems.
We propose a new method about optically pumped cesium beam clock. Due to the magnetic field of selecting magnet, the pumping light and detection light use the same frequency laser which makes system structure simpler....
We propose a new method about optically pumped cesium beam clock. Due to the magnetic field of selecting magnet, the pumping light and detection light use the same frequency laser which makes system structure simpler. The short-term frequency stability is 1.8×10 -12 τ -1/2 .
Prompt-based methods have gained increasing attention on NLP and shown validity on many downstream tasks. Many works have focused on mining these methods' potential for knowledge extraction, but few explore their ...
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We achieve a compact optical frequency standard with an extended cavity diode laser locked to the 459-nm 6S1/2-7P1/2 transition of thermal 133Cs atoms in a ϕ10mm×50mm glass cell, using modulation transfer spectro...
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We achieve a compact optical frequency standard with an extended cavity diode laser locked to the 459-nm 6S1/2-7P1/2 transition of thermal 133Cs atoms in a ϕ10mm×50mm glass cell, using modulation transfer spectroscopy (MTS). The self-estimated frequency stability of this laser is 1.4×10−14/τ. With heterodyne measurement, we verify the linewidth-narrowing effect of MTS locking and measure the frequency stability of the locked laser. The linewidth of each laser is reduced from the free-running 69.6 to 10.3 kHz after MTS stabilization, by a factor of 6.75. The Allan deviation measured via beat detection is 2.1×10−13/τ for each MTS-stabilized laser. In addition, we measure the hyperfine structure of the 7P1/2 energy level based on the heterodyne measurements, and calculate the magnetic dipole constant A of the Cs 7P1/2 level to be 94.38(6) MHz, which agrees well with previous measurements. This compact optical frequency standard can also be used in other applications that require high-stability lasers, such as laser interferometry, laser cooling, geodesy, and so on.
Ultracold atoms in a moving optical lattice with high controllab.lity are a feasible platform to research the transport phenomenon. Here, we study the transport process of ultracold atoms at the D band in a one-dimens...
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Ultracold atoms in a moving optical lattice with high controllab.lity are a feasible platform to research the transport phenomenon. Here, we study the transport process of ultracold atoms at the D band in a one-dimensional optical lattice and manipulate the transport of superposition states with different superposition weights of S-band and D-band atoms. In the experiment, we first load ultracold atoms into an optical lattice using the shortcut method and then accelerate the optical lattice by scanning the phase of lattice beams. The atomic transport at the D band and S band is demonstrated, respectively. The group velocity of atoms at the D band is opposite to that at the S band. By preparing superposition states with different superposition weights of the D-band and S-band atoms, we realize the manipulation of atomic group velocity from positive to negative, and observe the quantum interference between atoms at different bands. The influence of the lattice depth and acceleration on the transport process is also studied. Moreover, the multiorbital simulations are coincident with the experimental results. Our paper sheds light on the transport process of ultracold atoms at higher bands in optical lattices and provides a useful method to manipulate the transport of atomic superposition states.
We propose a fast and accurate estimation method of MDL-induced SNR penalty with non-uniform noise loading in SDM link. The proposed approach substantially saves the time cost while maintaining an estimation error wit...
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ISBN:
(数字)9798350379266
ISBN:
(纸本)9798350379273
We propose a fast and accurate estimation method of MDL-induced SNR penalty with non-uniform noise loading in SDM link. The proposed approach substantially saves the time cost while maintaining an estimation error within 0.2 dB.
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