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- Wasim, Syed Talal, et al.
(författare)
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Vita-CLIP: Video and text adaptive CLIP via Multimodal Prompting
- 2023
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Ingår i: 2023 IEEE/CVF CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION (CVPR). - : IEEE COMPUTER SOC. - 9798350301298 - 9798350301304 ; , s. 23034-23044
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Konferensbidrag (refereegranskat)abstract
- Adopting contrastive image-text pretrained models like CLIP towards video classification has gained attention due to its cost-effectiveness and competitive performance. However, recent works in this area face a trade-off. Fine-tuning the pretrained model to achieve strong supervised performance results in low zero-shot generalization. Similarly, freezing the backbone to retain zero-shot capability causes significant drop in supervised accuracy. Because of this, recent works in literature typically train separate models for supervised and zero-shot action recognition. In this work, we propose a multimodal prompt learning scheme that works to balance the supervised and zero-shot performance under a single unified training. Our prompting approach on the vision side caters for three aspects: 1) Global video-level prompts to model the data distribution; 2) Local frame-level prompts to provide per-frame discriminative conditioning; and 3) a summary prompt to extract a condensed video representation. Additionally, we define a prompting scheme on the text side to augment the textual context. Through this prompting scheme, we can achieve state-of-the-art zero-shot performance on Kinetics-600, HMDB51 and UCF101 while remaining competitive in the supervised setting. By keeping the pretrained backbone frozen, we optimize a much lower number of parameters and retain the existing general representation which helps achieve the strong zero-shot performance. Our codes/models will be released at https://github.com/TalalWasim/Vita-CLIP..
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| 2. |
- Basavoju, Srinivas, et al.
(författare)
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Pharmaceutical Co-crystallization of Norfloxacin
- 2006
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Ingår i: 2006 AAPS Annual Meeting and Exposition. - : American Association of Pharmaceutical Scientists.
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Konferensbidrag (refereegranskat)abstract
- Description: Aim: The objective of the study was to prepare co-crystal and salts of norfloxacin and to investigate their structural and pharmaceutical properties. Methods: Norfloxacin was crystallized in a series of solvents in an effort to investigate the polymorphism. Norfloxacin was also co-crystallized with isonicotinamide and succinic acid in different solvents. We have characterised these materials using DSC, IR, Raman and PXRD. The single crystal X-ray diffraction data was obtained and crystal structures were solved. The solubility and moisture sorption behaviour (0-90%RH) of these materials were determined. Results: Norfloxacin Anhydrate, 1 crystallizes in the triclinic P-1 space group with one neutral molecule in the asymmetric unit. The carboxylic acid group participates in the intramolecular O-HO (D=2.525 Å) hydrogen bonding with carbonyl group of the quinolone moiety. NorfloxacinIsonicotinamideCHCl3, 2 crystallizes in the centrosymmetric C2/c space group with one molecule of norfloxacin, one molecule of isonicotinamide and one molecule of CHCl3.in the asymmetric unit. Four molecules of norfloxacin generate a rectangular host type network with N-HO (D=2.668 Å) and N-HO (D=2.657 Å) interactions. Two isonicotinamide molecules form robust amideamide (N-HO, D=2.889 Å) homodimer synthon and fits into the rectangular grid (N-HO, D=2.929 Å). The CHCl3 molecules lie in the channels of the host frame work. Norfloxacin (Succinate)0.5 Hydrate, 3 crystallizes in the triclinic P-1 space group with one norfloxacin cation, half molecule of succinate dianion and one H2O molecule in the asymmetric unit. The two succinate anions and two norfloxacin cations form a cyclic tetramer synthon (N-HO, D=2.726 Å) and extends with H2O molecules through the hydrophilic channel generated by quinolone stacked layers (ππ, 4.041 Å) along the a-axis via O-HO (D=2.928 Å) interactions. The rank order of the solubility of these materials was 1<2
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| 3. |
- khan, Imran, et al.
(författare)
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Remotely Controlled Laboratory Setup for Active Noise Control and Acoustic Experiments
- 2012
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Ingår i: 2012 9th International Conference on Remote Engineering and Virtual. - Bilbao : IEEE. - 9781467325424 - 9781467325400
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Konferensbidrag (refereegranskat)abstract
- This paper presents a remotely controlled educational experiments setup for Active Noise Control (ANC) and acoustic experiments. The experiments setup is based on the Virtual Instruments Systems in Reality (VISIR) open source platform, National Instruments LabVIEW software and a Digital Signal Processor TMS320C6713 from Texas Instruments. The software development and equipment are controlled remotely form a client PC using a standard web browser. The proposed laboratory setup focuses on ANC experiments applied to noise in a ventilation duct. The laboratory setup will enable students to test and investigate properties and behaviour of adaptive algorithms in reality as compared to more confined simulations usually carried out in Matlab etc. The general steps in ANC, such as the feasibility of active control, designing, testing and debugging ANC algorithms, configuration and implementation of an active control system, are all covered. In addition students will be able to study the effect of analog to digital converters (ADC), anti-aliasing filters, digital to analog converters (DAC) and reconstruction filters using digital signal processing in reality, etc. The laboratory setup is suitable for a wide range of courses such as sound related experiments in upper secondary school physics, digital signal processing, adaptive signal processing, and acoustics at university level.
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