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5d9ff70d-ff3a-4ee6-96b1-3fb14e1f0a9d
yolo2u-net-detection-guided-3d-instance
2207.06215
null
https://arxiv.org/abs/2207.06215v1
https://arxiv.org/pdf/2207.06215v1.pdf
YOLO2U-Net: Detection-Guided 3D Instance Segmentation for Microscopy
Microscopy imaging techniques are instrumental for characterization and analysis of biological structures. As these techniques typically render 3D visualization of cells by stacking 2D projections, issues such as out-of-plane excitation and low resolution in the $z$-axis may pose challenges (even for human experts) to detect individual cells in 3D volumes as these non-overlapping cells may appear as overlapping. In this work, we introduce a comprehensive method for accurate 3D instance segmentation of cells in the brain tissue. The proposed method combines the 2D YOLO detection method with a multi-view fusion algorithm to construct a 3D localization of the cells. Next, the 3D bounding boxes along with the data volume are input to a 3D U-Net network that is designed to segment the primary cell in each 3D bounding box, and in turn, to carry out instance segmentation of cells in the entire volume. The promising performance of the proposed method is shown in comparison with some current deep learning-based 3D instance segmentation methods.
['David Solecki', 'Abbas Shirinifard', 'Derek C. Ros', 'Amirkoushyar Ziabari']
2022-07-13
null
null
null
null
['3d-instance-segmentation-1']
['computer-vision']
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[14.443215370178223, -3.1395487785339355]
f7e6ba7d-1ac5-428f-ab92-cef6b7a109b9
move-as-you-like-image-animation-in-e
2112.13647
null
https://arxiv.org/abs/2112.13647v1
https://arxiv.org/pdf/2112.13647v1.pdf
Move As You Like: Image Animation in E-Commerce Scenario
Creative image animations are attractive in e-commerce applications, where motion transfer is one of the import ways to generate animations from static images. However, existing methods rarely transfer motion to objects other than human body or human face, and even fewer apply motion transfer in practical scenarios. In this work, we apply motion transfer on the Taobao product images in real e-commerce scenario to generate creative animations, which are more attractive than static images and they will bring more benefits. We animate the Taobao products of dolls, copper running horses and toy dinosaurs based on motion transfer method for demonstration.
['Lixin Duan', 'Wen Li', 'Yuning Jiang', 'Tiezheng Ge', 'Jiale Tao', 'Biao Wang', 'Borun Xu']
2021-12-19
null
null
null
null
['image-animation']
['computer-vision']
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[10.859989166259766, -0.7282785177230835]
0da39448-565a-4ac4-8d15-a5ddabbed56a
hierarchical-dynamic-filtering-network-for
2007.06227
null
https://arxiv.org/abs/2007.06227v3
https://arxiv.org/pdf/2007.06227v3.pdf
Hierarchical Dynamic Filtering Network for RGB-D Salient Object Detection
The main purpose of RGB-D salient object detection (SOD) is how to better integrate and utilize cross-modal fusion information. In this paper, we explore these issues from a new perspective. We integrate the features of different modalities through densely connected structures and use their mixed features to generate dynamic filters with receptive fields of different sizes. In the end, we implement a kind of more flexible and efficient multi-scale cross-modal feature processing, i.e. dynamic dilated pyramid module. In order to make the predictions have sharper edges and consistent saliency regions, we design a hybrid enhanced loss function to further optimize the results. This loss function is also validated to be effective in the single-modal RGB SOD task. In terms of six metrics, the proposed method outperforms the existing twelve methods on eight challenging benchmark datasets. A large number of experiments verify the effectiveness of the proposed module and loss function. Our code, model and results are available at \url{https://github.com/lartpang/HDFNet}.
['Youwei Pang', 'Lihe Zhang', 'Huchuan Lu', 'Xiaoqi Zhao']
2020-07-13
null
https://www.ecva.net/papers/eccv_2020/papers_ECCV/html/4959_ECCV_2020_paper.php
https://www.ecva.net/papers/eccv_2020/papers_ECCV/papers/123700239.pdf
eccv-2020-8
['rgb-d-salient-object-detection', 'thermal-image-segmentation']
['computer-vision', 'computer-vision']
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[9.697980880737305, -0.8338647484779358]
97ad0800-0712-438a-a894-260742b4e14f
counterfactual-inference-in-duration-models
1902.08502
null
http://arxiv.org/abs/1902.08502v1
http://arxiv.org/pdf/1902.08502v1.pdf
Counterfactual Inference in Duration Models with Random Censoring
We propose a counterfactual Kaplan-Meier estimator that incorporates exogenous covariates and unobserved heterogeneity of unrestricted dimensionality in duration models with random censoring. Under some regularity conditions, we establish the joint weak convergence of the proposed counterfactual estimator and the unconditional Kaplan-Meier (1958) estimator. Applying the functional delta method, we make inference on the cumulative hazard policy effect, that is, the change of duration dependence in response to a counterfactual policy. We also evaluate the finite sample performance of the proposed counterfactual estimation method in a Monte Carlo study.
[]
2019-02-22
null
null
null
null
['counterfactual-inference']
['miscellaneous']
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[7.959960460662842, 5.197795391082764]
20af043f-e54c-45cf-99c1-5a3239836049
machine-translation-with-weakly-paired-1
null
null
https://aclanthology.org/D19-1446
https://aclanthology.org/D19-1446.pdf
Machine Translation With Weakly Paired Documents
Neural machine translation, which achieves near human-level performance in some languages, strongly relies on the large amounts of parallel sentences, which hinders its applicability to low-resource language pairs. Recent works explore the possibility of unsupervised machine translation with monolingual data only, leading to much lower accuracy compared with the supervised one. Observing that weakly paired bilingual documents are much easier to collect than bilingual sentences, e.g., from Wikipedia, news websites or books, in this paper, we investigate training translation models with weakly paired bilingual documents. Our approach contains two components. 1) We provide a simple approach to mine implicitly bilingual sentence pairs from document pairs which can then be used as supervised training signals. 2) We leverage the topic consistency of two weakly paired documents and learn the sentence translation model by constraining the word distribution-level alignments. We evaluate our method on weakly paired documents from Wikipedia on six tasks, the widely used WMT16 German$\leftrightarrow$English, WMT13 Spanish$\leftrightarrow$English and WMT16 Romanian$\leftrightarrow$English translation tasks. We obtain 24.1/30.3, 28.1/27.6 and 30.1/27.6 BLEU points separately, outperforming previous results by more than 5 BLEU points in each direction and reducing the gap between unsupervised translation and supervised translation up to 50{\%}.
['Jian-Huang Lai', 'Tie-Yan Liu', 'Tao Qin', 'Jinhua Zhu', 'Fei Gao', 'Di He', 'Lijun Wu']
2019-11-01
null
null
null
ijcnlp-2019-11
['unsupervised-machine-translation']
['natural-language-processing']
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[11.561674118041992, 10.318110466003418]
54c9751f-69e4-4124-9d26-a2f5f1e09673
doad-decoupled-one-stage-action-detection
2304.00254
null
https://arxiv.org/abs/2304.00254v2
https://arxiv.org/pdf/2304.00254v2.pdf
DOAD: Decoupled One Stage Action Detection Network
Localizing people and recognizing their actions from videos is a challenging task towards high-level video understanding. Existing methods are mostly two-stage based, with one stage for person bounding box generation and the other stage for action recognition. However, such two-stage methods are generally with low efficiency. We observe that directly unifying detection and action recognition normally suffers from (i) inferior learning due to different desired properties of context representation for detection and action recognition; (ii) optimization difficulty with insufficient training data. In this work, we present a decoupled one-stage network dubbed DOAD, to mitigate above issues and improve the efficiency for spatio-temporal action detection. To achieve it, we decouple detection and action recognition into two branches. Specifically, one branch focuses on detection representation for actor detection, and the other one for action recognition. For the action branch, we design a transformer-based module (TransPC) to model pairwise relationships between people and context. Different from commonly used vector-based dot product in self-attention, it is built upon a novel matrix-based key and value for Hadamard attention to model person-context information. It not only exploits relationships between person pairs but also takes into account context and relative position information. The results on AVA and UCF101-24 datasets show that our method is competitive with two-stage state-of-the-art methods with significant efficiency improvement.
['Mike Zheng Show', 'Jiashi Feng', 'Fan Wang', 'Pichao Wang', 'Shuning Chang']
2023-04-01
null
null
null
null
['action-recognition-in-videos', 'video-understanding']
['computer-vision', 'computer-vision']
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[8.204155921936035, 0.5377448797225952]
7e2d6e9c-9b43-4de6-b6c9-5bc6622ee90e
an-artificial-neural-network-functionalized
2205.10118
null
https://arxiv.org/abs/2205.10118v1
https://arxiv.org/pdf/2205.10118v1.pdf
An Artificial Neural Network Functionalized by Evolution
The topology of artificial neural networks has a significant effect on their performance. Characterizing efficient topology is a field of promising research in Artificial Intelligence. However, it is not a trivial task and it is mainly experimented on through convolutional neural networks. We propose a hybrid model which combines the tensor calculus of feed-forward neural networks with Pseudo-Darwinian mechanisms. This allows for finding topologies that are well adapted for elaboration of strategies, control problems or pattern recognition tasks. In particular, the model can provide adapted topologies at early evolutionary stages, and 'structural convergence', which can found applications in robotics, big-data and artificial life.
['Geoffroy Berthelot', 'Avner Bar-Hen', 'Fabien Furfaro']
2022-05-16
null
null
null
null
['artificial-life']
['miscellaneous']
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[8.262261390686035, 3.159212112426758]
d680a63d-1925-418c-bfba-5ee66721fd8c
morphological-disambiguation-from-stemming
2011.05504
null
https://arxiv.org/abs/2011.05504v1
https://arxiv.org/pdf/2011.05504v1.pdf
Morphological Disambiguation from Stemming Data
Morphological analysis and disambiguation is an important task and a crucial preprocessing step in natural language processing of morphologically rich languages. Kinyarwanda, a morphologically rich language, currently lacks tools for automated morphological analysis. While linguistically curated finite state tools can be easily developed for morphological analysis, the morphological richness of the language allows many ambiguous analyses to be produced, requiring effective disambiguation. In this paper, we propose learning to morphologically disambiguate Kinyarwanda verbal forms from a new stemming dataset collected through crowd-sourcing. Using feature engineering and a feed-forward neural network based classifier, we achieve about 89% non-contextualized disambiguation accuracy. Our experiments reveal that inflectional properties of stems and morpheme association rules are the most discriminative features for disambiguation.
['Antoine Nzeyimana']
2020-11-11
null
https://aclanthology.org/2020.coling-main.409
https://aclanthology.org/2020.coling-main.409.pdf
coling-2020-8
['morphological-disambiguation']
['natural-language-processing']
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[10.410239219665527, 10.100655555725098]
f93fa78d-74d6-4fc5-aacf-b75bf6abf8d2
conceptual-cognitive-maps-formation-with
2307.01577
null
https://arxiv.org/abs/2307.01577v1
https://arxiv.org/pdf/2307.01577v1.pdf
Conceptual Cognitive Maps Formation with Neural Successor Networks and Word Embeddings
The human brain possesses the extraordinary capability to contextualize the information it receives from our environment. The entorhinal-hippocampal plays a critical role in this function, as it is deeply engaged in memory processing and constructing cognitive maps using place and grid cells. Comprehending and leveraging this ability could significantly augment the field of artificial intelligence. The multi-scale successor representation serves as a good model for the functionality of place and grid cells and has already shown promise in this role. Here, we introduce a model that employs successor representations and neural networks, along with word embedding vectors, to construct a cognitive map of three separate concepts. The network adeptly learns two different scaled maps and situates new information in proximity to related pre-existing representations. The dispersion of information across the cognitive map varies according to its scale - either being heavily concentrated, resulting in the formation of the three concepts, or spread evenly throughout the map. We suggest that our model could potentially improve current AI models by providing multi-modal context information to any input, based on a similarity metric for the input and pre-existing knowledge representations.
['Patrick Krauss', 'Andreas Maier', 'Achim Schilling', 'Paul Stoewer']
2023-07-04
null
null
null
null
['word-embeddings']
['methodology']
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[10.599699974060059, 2.381809949874878]
a6ec2097-58ae-4b9e-b716-1555648beea1
tuning-free-plug-and-play-hyperspectral-image
2211.15307
null
https://arxiv.org/abs/2211.15307v2
https://arxiv.org/pdf/2211.15307v2.pdf
Tuning-free Plug-and-Play Hyperspectral Image Deconvolution with Deep Priors
Deconvolution is a widely used strategy to mitigate the blurring and noisy degradation of hyperspectral images~(HSI) generated by the acquisition devices. This issue is usually addressed by solving an ill-posed inverse problem. While investigating proper image priors can enhance the deconvolution performance, it is not trivial to handcraft a powerful regularizer and to set the regularization parameters. To address these issues, in this paper we introduce a tuning-free Plug-and-Play (PnP) algorithm for HSI deconvolution. Specifically, we use the alternating direction method of multipliers (ADMM) to decompose the optimization problem into two iterative sub-problems. A flexible blind 3D denoising network (B3DDN) is designed to learn deep priors and to solve the denoising sub-problem with different noise levels. A measure of 3D residual whiteness is then investigated to adjust the penalty parameters when solving the quadratic sub-problems, as well as a stopping criterion. Experimental results on both simulated and real-world data with ground-truth demonstrate the superiority of the proposed method.
['Cédric Richard', 'Jie Chen', 'Xiuheng Wang']
2022-11-28
null
null
null
null
['image-deconvolution']
['computer-vision']
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[11.218779563903809, -2.4727227687835693]
1d56f060-1379-4e88-b13b-4259ccf76a42
clipter-looking-at-the-bigger-picture-in
2301.07464
null
https://arxiv.org/abs/2301.07464v1
https://arxiv.org/pdf/2301.07464v1.pdf
CLIPTER: Looking at the Bigger Picture in Scene Text Recognition
Understanding the scene is often essential for reading text in real-world scenarios. However, current scene text recognizers operate on cropped text images, unaware of the bigger picture. In this work, we harness the representative power of recent vision-language models, such as CLIP, to provide the crop-based recognizer with scene, image-level information. Specifically, we obtain a rich representation of the entire image and fuse it with the recognizer word-level features via cross-attention. Moreover, a gated mechanism is introduced that gradually shifts to the context-enriched representation, enabling simply fine-tuning a pretrained recognizer. We implement our model-agnostic framework, named CLIPTER - CLIP Text Recognition, on several leading text recognizers and demonstrate consistent performance gains, achieving state-of-the-art results over multiple benchmarks. Furthermore, an in-depth analysis reveals improved robustness to out-of-vocabulary words and enhanced generalization in low-data regimes.
['Ron Litman', 'Shai Mazor', 'Royee Tichauer', 'Oren Nuriel', 'Roy Ganz', 'Alona Golts', 'David Bensaïd', 'Aviad Aberdam']
2023-01-18
null
null
null
null
['scene-text-recognition']
['computer-vision']
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[11.794608116149902, 2.1817545890808105]
9ec42af3-996b-474e-a763-d0acfab1f24a
3d-skeleton-based-few-shot-action-recognition
2112.12668
null
https://arxiv.org/abs/2112.12668v1
https://arxiv.org/pdf/2112.12668v1.pdf
3D Skeleton-based Few-shot Action Recognition with JEANIE is not so Naïve
In this paper, we propose a Few-shot Learning pipeline for 3D skeleton-based action recognition by Joint tEmporal and cAmera viewpoiNt alIgnmEnt (JEANIE). To factor out misalignment between query and support sequences of 3D body joints, we propose an advanced variant of Dynamic Time Warping which jointly models each smooth path between the query and support frames to achieve simultaneously the best alignment in the temporal and simulated camera viewpoint spaces for end-to-end learning under the limited few-shot training data. Sequences are encoded with a temporal block encoder based on Simple Spectral Graph Convolution, a lightweight linear Graph Neural Network backbone (we also include a setting with a transformer). Finally, we propose a similarity-based loss which encourages the alignment of sequences of the same class while preventing the alignment of unrelated sequences. We demonstrate state-of-the-art results on NTU-60, NTU-120, Kinetics-skeleton and UWA3D Multiview Activity II.
['Piotr Koniusz', 'Jun Liu', 'Lei Wang']
2021-12-23
null
null
null
null
['few-shot-action-recognition']
['computer-vision']
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[7.743653297424316, 0.14527355134487152]
007c8436-f305-431e-b664-dd94b5100b9a
cdvae-co-embedding-deep-variational-auto
1612.00132
null
http://arxiv.org/abs/1612.00132v2
http://arxiv.org/pdf/1612.00132v2.pdf
CDVAE: Co-embedding Deep Variational Auto Encoder for Conditional Variational Generation
Problems such as predicting a new shading field (Y) for an image (X) are ambiguous: many very distinct solutions are good. Representing this ambiguity requires building a conditional model P(Y|X) of the prediction, conditioned on the image. Such a model is difficult to train, because we do not usually have training data containing many different shadings for the same image. As a result, we need different training examples to share data to produce good models. This presents a danger we call "code space collapse" - the training procedure produces a model that has a very good loss score, but which represents the conditional distribution poorly. We demonstrate an improved method for building conditional models by exploiting a metric constraint on training data that prevents code space collapse. We demonstrate our model on two example tasks using real data: image saturation adjustment, image relighting. We describe quantitative metrics to evaluate ambiguous generation results. Our results quantitatively and qualitatively outperform different strong baselines.
['Aditya Deshpande', 'Jiajun Lu', 'David Forsyth']
2016-12-01
null
null
null
null
['image-relighting']
['computer-vision']
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[9.910144805908203, -2.8825721740722656]
ac6761ab-555a-4c1a-8cac-3baadfbcc9ec
reverberation-as-supervision-for-speech
2211.08303
null
https://arxiv.org/abs/2211.08303v1
https://arxiv.org/pdf/2211.08303v1.pdf
Reverberation as Supervision for Speech Separation
This paper proposes reverberation as supervision (RAS), a novel unsupervised loss function for single-channel reverberant speech separation. Prior methods for unsupervised separation required the synthesis of mixtures of mixtures or assumed the existence of a teacher model, making them difficult to consider as potential methods explaining the emergence of separation abilities in an animal's auditory system. We assume the availability of two-channel mixtures at training time, and train a neural network to separate the sources given one of the channels as input such that the other channel may be predicted from the separated sources. As the relationship between the room impulse responses (RIRs) of each channel depends on the locations of the sources, which are unknown to the network, the network cannot rely on learning that relationship. Instead, our proposed loss function fits each of the separated sources to the mixture in the target channel via Wiener filtering, and compares the resulting mixture to the ground-truth one. We show that minimizing the scale-invariant signal-to-distortion ratio (SI-SDR) of the predicted right-channel mixture with respect to the ground truth implicitly guides the network towards separating the left-channel sources. On a semi-supervised reverberant speech separation task based on the WHAMR! dataset, using training data where just 5% (resp., 10%) of the mixtures are labeled with associated isolated sources, we achieve 70% (resp., 78%) of the SI-SDR improvement obtained when training with supervision on the full training set, while a model trained only on the labeled data obtains 43% (resp., 45%).
['Jonathan Le Roux', 'Aswin Shanmugam Subramanian', 'Gordon Wichern', 'Christoph Boeddeker', 'Rohith Aralikatti']
2022-11-15
null
null
null
null
['speech-separation']
['speech']
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[15.174395561218262, 5.743254661560059]
ed2c2d18-7248-444f-bf9b-41c5c3a44013
accidental-learners-spoken-language
2211.05103
null
https://arxiv.org/abs/2211.05103v2
https://arxiv.org/pdf/2211.05103v2.pdf
Accidental Learners: Spoken Language Identification in Multilingual Self-Supervised Models
In this paper, we extend previous self-supervised approaches for language identification by experimenting with Conformer based architecture in a multilingual pre-training paradigm. We find that pre-trained speech models optimally encode language discriminatory information in lower layers. Further, we demonstrate that the embeddings obtained from these layers are significantly robust to classify unseen languages and different acoustic environments without additional training. After fine-tuning a pre-trained Conformer model on the VoxLingua107 dataset, we achieve results similar to current state-of-the-art systems for language identification. More, our model accomplishes this with 5x less parameters. We open-source the model through the NVIDIA NeMo toolkit.
['Boris Ginsburg', 'Samuel Kriman', 'Krishna C. Puvvada', 'Fei Jia', 'Travis M. Bartley']
2022-11-09
null
null
null
null
['spoken-language-identification']
['speech']
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[14.192110061645508, 6.626827716827393]
9689b8a2-6c1c-4110-894b-9e36554fa697
uncertainty-aware-multiple-instance-learning-1
2302.03116
null
https://arxiv.org/abs/2302.03116v1
https://arxiv.org/pdf/2302.03116v1.pdf
Uncertainty-Aware Multiple-Instance Learning for Reliable Classification: Application to Optical Coherence Tomography
Deep learning classification models for medical image analysis often perform well on data from scanners that were used during training. However, when these models are applied to data from different vendors, their performance tends to drop substantially. Artifacts that only occur within scans from specific scanners are major causes of this poor generalizability. We aimed to improve the reliability of deep learning classification models by proposing Uncertainty-Based Instance eXclusion (UBIX). This technique, based on multiple-instance learning, reduces the effect of corrupted instances on the bag-classification by seamlessly integrating out-of-distribution (OOD) instance detection during inference. Although UBIX is generally applicable to different medical images and diverse classification tasks, we focused on staging of age-related macular degeneration in optical coherence tomography. After being trained using images from one vendor, UBIX showed a reliable behavior, with a slight decrease in performance (a decrease of the quadratic weighted kappa ($\kappa_w$) from 0.861 to 0.708), when applied to images from different vendors containing artifacts; while a state-of-the-art 3D neural network suffered from a significant detriment of performance ($\kappa_w$ from 0.852 to 0.084) on the same test set. We showed that instances with unseen artifacts can be identified with OOD detection and their contribution to the bag-level predictions can be reduced, improving reliability without the need for retraining on new data. This potentially increases the applicability of artificial intelligence models to data from other scanners than the ones for which they were developed.
['Clara I. Sánchez', 'Caroline C. W. Klaver', 'Carel B. Hoyng', 'Bram van Ginneken', 'Coen de Vente']
2023-02-06
null
null
null
null
['multiple-instance-learning']
['methodology']
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[15.017261505126953, -2.435399055480957]
2aed6653-8b1c-46f3-860a-9a78f67e1652
usd-unknown-sensitive-detector-empowered-by
2306.02275
null
https://arxiv.org/abs/2306.02275v1
https://arxiv.org/pdf/2306.02275v1.pdf
USD: Unknown Sensitive Detector Empowered by Decoupled Objectness and Segment Anything Model
Open World Object Detection (OWOD) is a novel and challenging computer vision task that enables object detection with the ability to detect unknown objects. Existing methods typically estimate the object likelihood with an additional objectness branch, but ignore the conflict in learning objectness and classification boundaries, which oppose each other on the semantic manifold and training objective. To address this issue, we propose a simple yet effective learning strategy, namely Decoupled Objectness Learning (DOL), which divides the learning of these two boundaries into suitable decoder layers. Moreover, detecting unknown objects comprehensively requires a large amount of annotations, but labeling all unknown objects is both difficult and expensive. Therefore, we propose to take advantage of the recent Large Vision Model (LVM), specifically the Segment Anything Model (SAM), to enhance the detection of unknown objects. Nevertheless, the output results of SAM contain noise, including backgrounds and fragments, so we introduce an Auxiliary Supervision Framework (ASF) that uses a pseudo-labeling and a soft-weighting strategies to alleviate the negative impact of noise. Extensive experiments on popular benchmarks, including Pascal VOC and MS COCO, demonstrate the effectiveness of our approach. Our proposed Unknown Sensitive Detector (USD) outperforms the recent state-of-the-art methods in terms of Unknown Recall, achieving significant improvements of 14.3\%, 15.5\%, and 8.9\% on the M-OWODB, and 27.1\%, 29.1\%, and 25.1\% on the S-OWODB.
['Siqi Wang', 'Yusong Tan', 'Wei Chen', 'Yulin He']
2023-06-04
null
null
null
null
['open-world-object-detection']
['computer-vision']
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[9.304661750793457, 1.2957957983016968]
cf1309ae-a6f6-412b-b313-c19e6f44121d
duth-at-semeval-2017-task-4-a-voting
null
null
https://aclanthology.org/S17-2117
https://aclanthology.org/S17-2117.pdf
DUTH at SemEval-2017 Task 4: A Voting Classification Approach for Twitter Sentiment Analysis
This report describes our participation to SemEval-2017 Task 4: Sentiment Analysis in Twitter, specifically in subtasks A, B, and C. The approach for text sentiment classification is based on a Majority Vote scheme and combined supervised machine learning methods with classical linguistic resources, including bag-of-words and sentiment lexicon features.
['Symeon Symeonidis', 'John Kordonis', 'Dimitrios Effrosynidis', 'Avi Arampatzis']
2017-08-01
null
null
null
semeval-2017-8
['twitter-sentiment-analysis']
['natural-language-processing']
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[11.196707725524902, 6.923301696777344]
f19510e4-7ea0-4f97-a0aa-f21c5e9dd3f7
on-the-convergence-of-policy-gradient-in
2212.10439
null
https://arxiv.org/abs/2212.10439v2
https://arxiv.org/pdf/2212.10439v2.pdf
Policy Gradient in Robust MDPs with Global Convergence Guarantee
Robust Markov decision processes (RMDPs) provide a promising framework for computing reliable policies in the face of model errors. Many successful reinforcement learning algorithms build on variations of policy-gradient methods, but adapting these methods to RMDPs has been challenging. As a result, the applicability of RMDPs to large, practical domains remains limited. This paper proposes a new Double-Loop Robust Policy Gradient (DRPG), the first generic policy gradient method for RMDPs. In contrast with prior robust policy gradient algorithms, DRPG monotonically reduces approximation errors to guarantee convergence to a globally optimal policy in tabular RMDPs. We introduce a novel parametric transition kernel and solve the inner loop robust policy via a gradient-based method. Finally, our numerical results demonstrate the utility of our new algorithm and confirm its global convergence properties.
['Marek Petrik', 'Chin Pang Ho', 'Qiuhao Wang']
2022-12-20
null
null
null
null
['policy-gradient-methods']
['methodology']
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[4.156149864196777, 2.3501391410827637]
855f4ff2-e04d-4a22-b9c1-975d0ef385c7
hard-sample-guided-hybrid-contrast-learning
2109.12333
null
https://arxiv.org/abs/2109.12333v2
https://arxiv.org/pdf/2109.12333v2.pdf
Hard-sample Guided Hybrid Contrast Learning for Unsupervised Person Re-Identification
Unsupervised person re-identification (Re-ID) is a promising and very challenging research problem in computer vision. Learning robust and discriminative features with unlabeled data is of central importance to Re-ID. Recently, more attention has been paid to unsupervised Re-ID algorithms based on clustered pseudo-label. However, the previous approaches did not fully exploit information of hard samples, simply using cluster centroid or all instances for contrastive learning. In this paper, we propose a Hard-sample Guided Hybrid Contrast Learning (HHCL) approach combining cluster-level loss with instance-level loss for unsupervised person Re-ID. Our approach applies cluster centroid contrastive loss to ensure that the network is updated in a more stable way. Meanwhile, introduction of a hard instance contrastive loss further mines the discriminative information. Extensive experiments on two popular large-scale Re-ID benchmarks demonstrate that our HHCL outperforms previous state-of-the-art methods and significantly improves the performance of unsupervised person Re-ID. The code of our work is available soon at https://github.com/bupt-ai-cz/HHCL-ReID.
['Gang He', 'Chuang Zhu', 'Zheng Hu']
2021-09-25
null
null
null
null
['unsupervised-person-re-identification']
['computer-vision']
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[14.803421974182129, 1.049684762954712]
44db4a75-e6fc-407d-bcf1-26023fe35d38
learning-reward-machines-for-partially
null
null
http://papers.nips.cc/paper/9685-learning-reward-machines-for-partially-observable-reinforcement-learning
http://papers.nips.cc/paper/9685-learning-reward-machines-for-partially-observable-reinforcement-learning.pdf
Learning Reward Machines for Partially Observable Reinforcement Learning
Reward Machines (RMs), originally proposed for specifying problems in Reinforcement Learning (RL), provide a structured, automata-based representation of a reward function that allows an agent to decompose problems into subproblems that can be efficiently learned using off-policy learning. Here we show that RMs can be learned from experience, instead of being specified by the user, and that the resulting problem decomposition can be used to effectively solve partially observable RL problems. We pose the task of learning RMs as a discrete optimization problem where the objective is to find an RM that decomposes the problem into a set of subproblems such that the combination of their optimal memoryless policies is an optimal policy for the original problem. We show the effectiveness of this approach on three partially observable domains, where it significantly outperforms A3C, PPO, and ACER, and discuss its advantages, limitations, and broader potential.
['Sheila McIlraith', 'Rodrigo Toro Icarte', 'Rick Valenzano', 'Ethan Waldie', 'Toryn Klassen', 'Margarita Castro']
2019-12-01
null
null
null
neurips-2019-12
['problem-decomposition']
['miscellaneous']
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[4.100226879119873, 1.7518945932388306]
29a21968-c0a1-4a77-8418-5ebf2730871e
mobile-end-tone-mapping-based-on-integral
2102.01289
null
https://arxiv.org/abs/2102.01289v1
https://arxiv.org/pdf/2102.01289v1.pdf
Mobile-end Tone Mapping based on Integral Image and Integral Histogram
Wide dynamic range (WDR) image tone mapping is in high demand in many applications like film production, security monitoring, and photography. It is especially crucial for mobile devices because most of the images taken today are from mobile phones, hence such technology is highly demanded in the consumer market of mobile devices and is essential for a good customer experience. However, high-quality and high-performance WDR image tone mapping implementations are rarely found in the mobile-end. In this paper, we introduce a high performance, mobile-end WDR image tone mapping implementation. It leverages the tone mapping results of multiple receptive fields and calculates a suitable value for each pixel. The utilization of integral image and integral histogram significantly reduce the required computation. Moreover, GPU parallel computation is used to increase the processing speed. The experimental results indicate that our implementation can process a high-resolution WDR image within a second on mobile devices and produce appealing image quality.
['Orly Yadid-Pecht', 'Ulian Shahnovich', 'Ziyi Liu', 'Mengchen Lin', 'Jie Yang']
2021-02-02
null
null
null
null
['tone-mapping']
['computer-vision']
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[10.882229804992676, -2.449770212173462]
ec707aa0-93b2-4125-844a-b59fb9a64ab7
moving-object-detection-by-detecting
1109.0882
null
http://arxiv.org/abs/1109.0882v2
http://arxiv.org/pdf/1109.0882v2.pdf
Moving Object Detection by Detecting Contiguous Outliers in the Low-Rank Representation
Object detection is a fundamental step for automated video analysis in many vision applications. Object detection in a video is usually performed by object detectors or background subtraction techniques. Often, an object detector requires manually labeled examples to train a binary classifier, while background subtraction needs a training sequence that contains no objects to build a background model. To automate the analysis, object detection without a separate training phase becomes a critical task. People have tried to tackle this task by using motion information. But existing motion-based methods are usually limited when coping with complex scenarios such as nonrigid motion and dynamic background. In this paper, we show that above challenges can be addressed in a unified framework named DEtecting Contiguous Outliers in the LOw-rank Representation (DECOLOR). This formulation integrates object detection and background learning into a single process of optimization, which can be solved by an alternating algorithm efficiently. We explain the relations between DECOLOR and other sparsity-based methods. Experiments on both simulated data and real sequences demonstrate that DECOLOR outperforms the state-of-the-art approaches and it can work effectively on a wide range of complex scenarios.
['Can Yang', 'Xiaowei Zhou', 'Weichuan Yu']
2011-09-05
null
null
null
null
['moving-object-detection']
['computer-vision']
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[8.985371589660645, -0.7897384762763977]
4f36f9e1-7821-4356-be66-43bb97d49e5f
neural-affine-grayscale-image-denoising
1709.05672
null
http://arxiv.org/abs/1709.05672v1
http://arxiv.org/pdf/1709.05672v1.pdf
Neural Affine Grayscale Image Denoising
We propose a new grayscale image denoiser, dubbed as Neural Affine Image Denoiser (Neural AIDE), which utilizes neural network in a novel way. Unlike other neural network based image denoising methods, which typically apply simple supervised learning to learn a mapping from a noisy patch to a clean patch, we formulate to train a neural network to learn an \emph{affine} mapping that gets applied to a noisy pixel, based on its context. Our formulation enables both supervised training of the network from the labeled training dataset and adaptive fine-tuning of the network parameters using the given noisy image subject to denoising. The key tool for devising Neural AIDE is to devise an estimated loss function of the MSE of the affine mapping, solely based on the noisy data. As a result, our algorithm can outperform most of the recent state-of-the-art methods in the standard benchmark datasets. Moreover, our fine-tuning method can nicely overcome one of the drawbacks of the patch-level supervised learning methods in image denoising; namely, a supervised trained model with a mismatched noise variance can be mostly corrected as long as we have the matched noise variance during the fine-tuning step.
['Sungmin Cha', 'Taesup Moon']
2017-09-17
null
null
null
null
['grayscale-image-denoising']
['computer-vision']
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[11.550800323486328, -2.3362417221069336]
b833dce8-4cbe-4a81-9beb-df8fb588ff2c
improving-generalizability-in-implicitly
null
null
https://openreview.net/forum?id=AfBuiCDtF_0
https://openreview.net/pdf?id=AfBuiCDtF_0
Improving Generalizability in Implicitly Abusive Language Detection with Concept Activation Vectors
Robustness of machine learning models on ever-changing real-world data is critical, especially for applications affecting human well-being such as content moderation. New kinds of abusive language continually emerge in online discussions in response to current events (e.g., COVID-19), and the deployed abuse detection systems should be updated regularly to remain accurate. In this paper, we show that general abusive language classifiers tend to be fairly reliable in detecting out-of-domain explicitly abusive utterances but fail to detect new types of more subtle, implicit abuse. Next, we propose an interpretability technique, based on the Testing Concept Activation Vector (TCAV) method from computer vision, to quantify the sensitivity of a trained model to the human-defined concepts of explicit and implicit abusive language, and use that to explain the generalizability of the model on new data, in this case, COVID-related anti-Asian hate speech. Extending this technique, we introduce a novel metric, Degree of Explicitness, for a single instance and show that the new metric is beneficial in suggesting out-of-domain unlabeled examples to effectively enrich the training data with informative, implicitly abusive texts.
['Anonymous']
2021-11-16
null
https://openreview.net/forum?id=eRRLIv7DrOX
https://openreview.net/pdf?id=eRRLIv7DrOX
acl-arr-september-2021-9
['abusive-language', 'abuse-detection']
['natural-language-processing', 'natural-language-processing']
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[8.716962814331055, 10.48544979095459]
17f17a91-9b4d-4aa9-8ccc-51937c45a4bc
self-supervised-co-training-for-video
2010.09709
null
https://arxiv.org/abs/2010.09709v2
https://arxiv.org/pdf/2010.09709v2.pdf
Self-supervised Co-training for Video Representation Learning
The objective of this paper is visual-only self-supervised video representation learning. We make the following contributions: (i) we investigate the benefit of adding semantic-class positives to instance-based Info Noise Contrastive Estimation (InfoNCE) training, showing that this form of supervised contrastive learning leads to a clear improvement in performance; (ii) we propose a novel self-supervised co-training scheme to improve the popular infoNCE loss, exploiting the complementary information from different views, RGB streams and optical flow, of the same data source by using one view to obtain positive class samples for the other; (iii) we thoroughly evaluate the quality of the learnt representation on two different downstream tasks: action recognition and video retrieval. In both cases, the proposed approach demonstrates state-of-the-art or comparable performance with other self-supervised approaches, whilst being significantly more efficient to train, i.e. requiring far less training data to achieve similar performance.
['Andrew Zisserman', 'Weidi Xie', 'Tengda Han']
2020-10-19
null
http://proceedings.neurips.cc/paper/2020/hash/3def184ad8f4755ff269862ea77393dd-Abstract.html
http://proceedings.neurips.cc/paper/2020/file/3def184ad8f4755ff269862ea77393dd-Paper.pdf
neurips-2020-12
['self-supervised-action-recognition']
['computer-vision']
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[8.815120697021484, 0.851734459400177]
0f285daf-b882-4df2-a4dd-cc4ca687449a
on-the-generalisation-capabilities-of-fisher
2103.01721
null
https://arxiv.org/abs/2103.01721v1
https://arxiv.org/pdf/2103.01721v1.pdf
On the Generalisation Capabilities of Fisher Vector based Face Presentation Attack Detection
In the last decades, the broad development experienced by biometric systems has unveiled several threats which may decrease their trustworthiness. Those are attack presentations which can be easily carried out by a non-authorised subject to gain access to the biometric system. In order to mitigate those security concerns, most face Presentation Attack Detection techniques have reported a good detection performance when they are evaluated on known Presentation Attack Instruments (PAI) and acquisition conditions, in contrast to more challenging scenarios where unknown attacks are included in the test set. For those more realistic scenarios, the existing algorithms face difficulties to detect unknown PAI species in many cases. In this work, we use a new feature space based on Fisher Vectors, computed from compact Binarised Statistical Image Features histograms, which allow discovering semantic feature subsets from known samples in order to enhance the detection of unknown attacks. This new representation, evaluated for challenging unknown attacks taken from freely available facial databases, shows promising results: a BPCER100 under 17% together with an AUC over 98% can be achieved in the presence of unknown attacks. In addition, by training a limited number of parameters, our method is able to achieve state-of-the-art deep learning-based approaches for cross-dataset scenarios.
['Christoph Busch', 'Marta Gomez-Barrero', 'Lázaro J. González-Soler']
2021-03-02
null
null
null
null
['face-presentation-attack-detection']
['computer-vision']
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[13.068305969238281, 1.0729204416275024]
e87be0b5-6fb5-47e1-96f9-ac0890998b0d
motion-compensated-three-dimensional
2204.12882
null
https://arxiv.org/abs/2204.12882v1
https://arxiv.org/pdf/2204.12882v1.pdf
Motion Compensated Three-Dimensional Frequency Selective Extrapolation for Improved Error Concealment in Video Communication
During transmission of video data over error-prone channels the risk of getting severe image distortions due to transmission errors is ubiquitous. To deal with image distortions at decoder side, error concealment is applied. This article presents Motion Compensated Three-Dimensional Frequency Selective Extrapolation, a novel spatio-temporal error concealment algorithm. The algorithm uses fractional-pel motion estimation and compensation as initial step, being followed by the generation of a model of the distorted signal. The model generation is conducted by an enhanced version of Three-Dimensional Frequency Selective Extrapolation, an existing error concealment algorithm. Compared to this existent algorithm, the proposed one yields an improvement in concealment quality of up to 1.64 dB PSNR. Altogether, the incorporation of motion compensation and the improved model generation extends the already high extrapolation quality of the underlying Frequency Selective Extrapolation, resulting in a gain of more than 3 dB compared to other well-known error concealment algorithms.
['André Kaup', 'Jürgen Seiler']
2022-04-27
null
null
null
null
['motion-compensation']
['computer-vision']
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[11.32832145690918, -2.2104036808013916]
cea292fa-e394-40a1-b91b-0b1a3110c312
a-stacked-deep-convolutional-neural-network
2111.12689
null
https://arxiv.org/abs/2111.12689v1
https://arxiv.org/pdf/2111.12689v1.pdf
A stacked deep convolutional neural network to predict the remaining useful life of a turbofan engine
This paper presents the data-driven techniques and methodologies used to predict the remaining useful life (RUL) of a fleet of aircraft engines that can suffer failures of diverse nature. The solution presented is based on two Deep Convolutional Neural Networks (DCNN) stacked in two levels. The first DCNN is used to extract a low-dimensional feature vector using the normalized raw data as input. The second DCNN ingests a list of vectors taken from the former DCNN and estimates the RUL. Model selection was carried out by means of Bayesian optimization using a repeated random subsampling validation approach. The proposed methodology was ranked in the third place of the 2021 PHM Conference Data Challenge.
['Joaquin Borrego-Diaz', 'Juan Galan-Paez', 'David Solis-Martin']
2021-11-24
null
null
null
null
['remaining-useful-lifetime-estimation']
['time-series']
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[6.726168632507324, 2.4764046669006348]
75bd02a6-2204-415e-88d8-ba6041d4ced7
where-are-the-facts-searching-for-fact
2010.03159
null
https://arxiv.org/abs/2010.03159v1
https://arxiv.org/pdf/2010.03159v1.pdf
Where Are the Facts? Searching for Fact-checked Information to Alleviate the Spread of Fake News
Although many fact-checking systems have been developed in academia and industry, fake news is still proliferating on social media. These systems mostly focus on fact-checking but usually neglect online users who are the main drivers of the spread of misinformation. How can we use fact-checked information to improve users' consciousness of fake news to which they are exposed? How can we stop users from spreading fake news? To tackle these questions, we propose a novel framework to search for fact-checking articles, which address the content of an original tweet (that may contain misinformation) posted by online users. The search can directly warn fake news posters and online users (e.g. the posters' followers) about misinformation, discourage them from spreading fake news, and scale up verified content on social media. Our framework uses both text and images to search for fact-checking articles, and achieves promising results on real-world datasets. Our code and datasets are released at https://github.com/nguyenvo09/EMNLP2020.
['Kyumin Lee', 'Nguyen Vo']
2020-10-07
null
https://aclanthology.org/2020.emnlp-main.621
https://aclanthology.org/2020.emnlp-main.621.pdf
emnlp-2020-11
['image-similarity-search', 'ad-hoc-information-retrieval']
['computer-vision', 'natural-language-processing']
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[8.136796951293945, 10.247846603393555]
548759a8-9444-4e10-8948-cd8db3d38c2e
on-robust-face-recognition-via-sparse
1303.01624
null
http://arxiv.org/abs/1303.1624v1
http://arxiv.org/pdf/1303.1624v1.pdf
On Robust Face Recognition via Sparse Encoding: the Good, the Bad, and the Ugly
In the field of face recognition, Sparse Representation (SR) has received considerable attention during the past few years. Most of the relevant literature focuses on holistic descriptors in closed-set identification applications. The underlying assumption in SR-based methods is that each class in the gallery has sufficient samples and the query lies on the subspace spanned by the gallery of the same class. Unfortunately, such assumption is easily violated in the more challenging face verification scenario, where an algorithm is required to determine if two faces (where one or both have not been seen before) belong to the same person. In this paper, we first discuss why previous attempts with SR might not be applicable to verification problems. We then propose an alternative approach to face verification via SR. Specifically, we propose to use explicit SR encoding on local image patches rather than the entire face. The obtained sparse signals are pooled via averaging to form multiple region descriptors, which are then concatenated to form an overall face descriptor. Due to the deliberate loss spatial relations within each region (caused by averaging), the resulting descriptor is robust to misalignment & various image deformations. Within the proposed framework, we evaluate several SR encoding techniques: l1-minimisation, Sparse Autoencoder Neural Network (SANN), and an implicit probabilistic technique based on Gaussian Mixture Models. Thorough experiments on AR, FERET, exYaleB, BANCA and ChokePoint datasets show that the proposed local SR approach obtains considerably better and more robust performance than several previous state-of-the-art holistic SR methods, in both verification and closed-set identification problems. The experiments also show that l1-minimisation based encoding has a considerably higher computational than the other techniques, but leads to higher recognition rates.
['Conrad Sanderson', 'Yongkang Wong', 'Mehrtash T. Harandi']
2013-03-07
null
null
null
null
['robust-face-recognition']
['computer-vision']
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[12.873790740966797, 0.540584146976471]
11536c1d-4f13-402e-8fe4-1a1f8c61f46c
learning-spatially-variant-map-models-for-non
null
null
http://openaccess.thecvf.com//content/CVPR2021/html/Dong_Learning_Spatially-Variant_MAP_Models_for_Non-Blind_Image_Deblurring_CVPR_2021_paper.html
http://openaccess.thecvf.com//content/CVPR2021/papers/Dong_Learning_Spatially-Variant_MAP_Models_for_Non-Blind_Image_Deblurring_CVPR_2021_paper.pdf
Learning Spatially-Variant MAP Models for Non-Blind Image Deblurring
The classical maximum a-posteriori (MAP) framework for non-blind image deblurring requires defining suitable data and regularization terms, whose interplay yields the desired clear image through optimization. The vast majority of prior work focuses on advancing one of these two crucial ingredients, while keeping the other one standard. Considering the indispensable roles and interplay of both data and regularization terms, we propose a simple and effective approach to jointly learn these two terms, embedding deep neural networks within the constraints of the MAP framework, trained in an end-to-end manner. The neural networks not only yield suitable image-adaptive features for both terms, but actually predict per-pixel spatially-variant features instead of the commonly used spatially-uniform ones. The resulting spatially-variant data and regularization terms particularly improve the restoration of fine-scale structures and detail. Quantitative and qualitative results underline the effectiveness of our approach, substantially outperforming the current state of the art.
['Bernt Schiele', 'Stefan Roth', 'Jiangxin Dong']
2021-06-19
null
null
null
cvpr-2021-1
['blind-image-deblurring']
['computer-vision']
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[11.562132835388184, -2.5125339031219482]
49e31c4e-8ec5-4c93-8ac3-11bcf85ac1a6
hierarchical-and-progressive-image-matting
2210.06906
null
https://arxiv.org/abs/2210.06906v1
https://arxiv.org/pdf/2210.06906v1.pdf
Hierarchical and Progressive Image Matting
Most matting researches resort to advanced semantics to achieve high-quality alpha mattes, and direct low-level features combination is usually explored to complement alpha details. However, we argue that appearance-agnostic integration can only provide biased foreground details and alpha mattes require different-level feature aggregation for better pixel-wise opacity perception. In this paper, we propose an end-to-end Hierarchical and Progressive Attention Matting Network (HAttMatting++), which can better predict the opacity of the foreground from single RGB images without additional input. Specifically, we utilize channel-wise attention to distill pyramidal features and employ spatial attention at different levels to filter appearance cues. This progressive attention mechanism can estimate alpha mattes from adaptive semantics and semantics-indicated boundaries. We also introduce a hybrid loss function fusing Structural SIMilarity (SSIM), Mean Square Error (MSE), Adversarial loss, and sentry supervision to guide the network to further improve the overall foreground structure. Besides, we construct a large-scale and challenging image matting dataset comprised of 59, 600 training images and 1000 test images (a total of 646 distinct foreground alpha mattes), which can further improve the robustness of our hierarchical and progressive aggregation model. Extensive experiments demonstrate that the proposed HAttMatting++ can capture sophisticated foreground structures and achieve state-of-the-art performance with single RGB images as input.
['Xin Yang', 'Guofeng Zhang', 'Qiang Cai', 'Yuxin Wang', 'Ziqi Wei', 'Yuhao Liu', 'Yu Qiao']
2022-10-13
null
null
null
null
['image-matting']
['computer-vision']
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[10.622556686401367, -0.9487459063529968]
c5f3f26c-962e-4136-a821-0a7b40e05663
boosting-multitask-learning-on-graphs-through
2306.14009
null
https://arxiv.org/abs/2306.14009v1
https://arxiv.org/pdf/2306.14009v1.pdf
Boosting Multitask Learning on Graphs through Higher-Order Task Affinities
Predicting node labels on a given graph is a widely studied problem with many applications, including community detection and molecular graph prediction. This paper considers predicting multiple node labeling functions on graphs simultaneously and revisits this problem from a multitask learning perspective. For a concrete example, consider overlapping community detection: each community membership is a binary node classification task. Due to complex overlapping patterns, we find that negative transfer is prevalent when we apply naive multitask learning to multiple community detection, as task relationships are highly nonlinear across different node labeling. To address the challenge, we develop an algorithm to cluster tasks into groups based on a higher-order task affinity measure. We then fit a multitask model on each task group, resulting in a boosting procedure on top of the baseline model. We estimate the higher-order task affinity measure between two tasks as the prediction loss of one task in the presence of another task and a random subset of other tasks. Then, we use spectral clustering on the affinity score matrix to identify task grouping. We design several speedup techniques to compute the higher-order affinity scores efficiently and show that they can predict negative transfers more accurately than pairwise task affinities. We validate our procedure using various community detection and molecular graph prediction data sets, showing favorable results compared with existing methods. Lastly, we provide a theoretical analysis to show that under a planted block model of tasks on graphs, our affinity scores can provably separate tasks into groups.
['Hongyang R. Zhang', 'Aneesh Sharma', 'Haotian Ju', 'Dongyue Li']
2023-06-24
null
null
null
null
['node-classification', 'community-detection']
['graphs', 'graphs']
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[7.180486679077148, 5.435795307159424]
8915797a-3044-4dce-ad94-87eed0cbad9a
blood-oxygen-saturation-estimation-from
2212.07116
null
https://arxiv.org/abs/2212.07116v2
https://arxiv.org/pdf/2212.07116v2.pdf
Blood Oxygen Saturation Estimation from Facial Video via DC and AC components of Spatio-temporal Map
Peripheral blood oxygen saturation (SpO2), an indicator of oxygen levels in the blood, is one of the most important physiological parameters. Although SpO2 is usually measured using a pulse oximeter, non-contact SpO2 estimation methods from facial or hand videos have been attracting attention in recent years. In this paper, we propose an SpO2 estimation method from facial videos based on convolutional neural networks (CNN). Our method constructs CNN models that consider the direct current (DC) and alternating current (AC) components extracted from the RGB signals of facial videos, which are important in the principle of SpO2 estimation. Specifically, we extract the DC and AC components from the spatio-temporal map using filtering processes and train CNN models to predict SpO2 from these components. We also propose an end-to-end model that predicts SpO2 directly from the spatio-temporal map by extracting the DC and AC components via convolutional layers. Experiments using facial videos and SpO2 data from 50 subjects demonstrate that the proposed method achieves a better estimation performance than current state-of-the-art SpO2 estimation methods.
['Hitoshi Imaoka', 'Yoshifumi Onishi', 'Yusuke Akamatsu']
2022-12-14
null
null
null
null
['spo2-estimation']
['medical']
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[13.899896621704102, 2.766494035720825]
5211d304-4503-45c9-810f-a2f447f92137
pnlp-mixer-an-efficient-all-mlp-architecture
2202.04350
null
https://arxiv.org/abs/2202.04350v2
https://arxiv.org/pdf/2202.04350v2.pdf
pNLP-Mixer: an Efficient all-MLP Architecture for Language
Large pre-trained language models based on transformer architecture have drastically changed the natural language processing (NLP) landscape. However, deploying those models for on-device applications in constrained devices such as smart watches is completely impractical due to their size and inference cost. As an alternative to transformer-based architectures, recent work on efficient NLP has shown that weight-efficient models can attain competitive performance for simple tasks, such as slot filling and intent classification, with model sizes in the order of the megabyte. This work introduces the pNLP-Mixer architecture, an embedding-free MLP-Mixer model for on-device NLP that achieves high weight-efficiency thanks to a novel projection layer. We evaluate a pNLP-Mixer model of only one megabyte in size on two multi-lingual semantic parsing datasets, MTOP and multiATIS. Our quantized model achieves 99.4% and 97.8% the performance of mBERT on MTOP and multi-ATIS, while using 170x fewer parameters. Our model consistently beats the state-of-the-art of tiny models (pQRNN), which is twice as large, by a margin up to 7.8% on MTOP.
['Diego Antognini', 'Peter Staar', 'Damian Pascual', 'Francesco Fusco']
2022-02-09
null
null
null
null
['slot-filling']
['natural-language-processing']
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[8.774942398071289, 3.72241473197937]
9167449a-ae86-472e-b6f9-3fb7d5214676
approximate-spectral-clustering-with
2302.11297
null
https://arxiv.org/abs/2302.11297v1
https://arxiv.org/pdf/2302.11297v1.pdf
Approximate spectral clustering with eigenvector selection and self-tuned $k$
The recently emerged spectral clustering surpasses conventional clustering methods by detecting clusters of any shape without the convexity assumption. Unfortunately, with a computational complexity of $O(n^3)$, it was infeasible for multiple real applications, where $n$ could be large. This stimulates researchers to propose the approximate spectral clustering (ASC). However, most of ASC methods assumed that the number of clusters $k$ was known. In practice, manual setting of $k$ could be subjective or time consuming. The proposed algorithm has two relevance metrics for estimating $k$ in two vital steps of ASC. One for selecting the eigenvectors spanning the embedding space, and the other to discover the number of clusters in that space. The algorithm used a growing neural gas (GNG) approximation, GNG is superior in preserving input data topology. The experimental setup demonstrates the efficiency of the proposed algorithm and its ability to compete with similar methods where $k$ was set manually.
['Masahiro Takatsuka', 'Mashaan Alshammari']
2023-02-22
null
null
null
null
['graph-clustering', 'spectral-graph-clustering', 'graph-partitioning']
['graphs', 'graphs', 'graphs']
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[7.541796684265137, 4.687739849090576]
1acdae83-85c6-4832-9c0c-d8e590f890ed
object-detection-based-inspection-of-power
2212.11017
null
https://arxiv.org/abs/2212.11017v1
https://arxiv.org/pdf/2212.11017v1.pdf
Object detection-based inspection of power line insulators: Incipient fault detection in the low data-regime
Deep learning-based object detection is a powerful approach for detecting faulty insulators in power lines. This involves training an object detection model from scratch, or fine tuning a model that is pre-trained on benchmark computer vision datasets. This approach works well with a large number of insulator images, but can result in unreliable models in the low data regime. The current literature mainly focuses on detecting the presence or absence of insulator caps, which is a relatively easy detection task, and does not consider detection of finer faults such as flashed and broken disks. In this article, we formulate three object detection tasks for insulator and asset inspection from aerial images, focusing on incipient faults in disks. We curate a large reference dataset of insulator images that can be used to learn robust features for detecting healthy and faulty insulators. We study the advantage of using this dataset in the low target data regime by pre-training on the reference dataset followed by fine-tuning on the target dataset. The results suggest that object detection models can be used to detect faults in insulators at a much incipient stage, and that transfer learning adds value depending on the type of object detection model. We identify key factors that dictate performance in the low data-regime and outline potential approaches to improve the state-of-the-art.
['Giovanni Sansavini', 'Etienne Auger', 'Blazhe Gjorgiev', 'Mohammad Hossein Saadat', 'Laya Das']
2022-12-21
null
null
null
null
['fault-detection']
['miscellaneous']
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[7.420025825500488, 1.9078953266143799]
8a7a165c-ed14-4e0d-9461-079478cb6b89
can-rumour-stance-alone-predict-veracity
null
null
https://aclanthology.org/C18-1284
https://aclanthology.org/C18-1284.pdf
Can Rumour Stance Alone Predict Veracity?
Prior manual studies of rumours suggested that crowd stance can give insights into the actual rumour veracity. Even though numerous studies of automatic veracity classification of social media rumours have been carried out, none explored the effectiveness of leveraging crowd stance to determine veracity. We use stance as an additional feature to those commonly used in earlier studies. We also model the veracity of a rumour using variants of Hidden Markov Models (HMM) and the collective stance information. This paper demonstrates that HMMs that use stance and tweets{'} times as the only features for modelling true and false rumours achieve F1 scores in the range of 80{\%}, outperforming those approaches where stance is used jointly with content and user based features.
['Sebastian Dungs', 'Kalina Bontcheva', 'Ahmet Aker', 'Norbert Fuhr']
2018-08-01
can-rumour-stance-alone-predict-veracity-1
https://aclanthology.org/C18-1284
https://aclanthology.org/C18-1284.pdf
coling-2018-8
['rumour-detection']
['natural-language-processing']
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[8.263701438903809, 10.117100715637207]
71789437-961d-4d05-8ce4-75c828f1cee7
vehicle-interfacing-neural-network-verifiers
2202.05207
null
https://arxiv.org/abs/2202.05207v1
https://arxiv.org/pdf/2202.05207v1.pdf
Vehicle: Interfacing Neural Network Verifiers with Interactive Theorem Provers
Verification of neural networks is currently a hot topic in automated theorem proving. Progress has been rapid and there are now a wide range of tools available that can verify properties of networks with hundreds of thousands of nodes. In theory this opens the door to the verification of larger control systems that make use of neural network components. However, although work has managed to incorporate the results of these verifiers to prove larger properties of individual systems, there is currently no general methodology for bridging the gap between verifiers and interactive theorem provers (ITPs). In this paper we present Vehicle, our solution to this problem. Vehicle is equipped with an expressive domain specific language for stating neural network specifications which can be compiled to both verifiers and ITPs. It overcomes previous issues with maintainability and scalability in similar ITP formalisations by using a standard ONNX file as the single canonical representation of the network. We demonstrate its utility by using it to connect the neural network verifier Marabou to Agda and then formally verifying that a car steered by a neural network never leaves the road, even in the face of an unpredictable cross wind and imperfect sensors. The network has over 20,000 nodes, and therefore this proof represents an improvement of 3 orders of magnitude over prior proofs about neural network enhanced systems in ITPs.
['Ekaterina Komendantskya', 'Luca Arnaboldi', 'Robert Atkey', 'Wen Kokke', 'Matthew L. Daggitt']
2022-02-10
null
null
null
null
['automated-theorem-proving', 'automated-theorem-proving']
['miscellaneous', 'reasoning']
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[6.412506103515625, 7.4565253257751465]
28ab2c40-29b1-4770-962f-56c33af019db
toplight-lightweight-neural-networks-with
null
null
http://openaccess.thecvf.com//content/CVPR2023/html/Yu_TOPLight_Lightweight_Neural_Networks_With_Task-Oriented_Pretraining_for_Visible-Infrared_Recognition_CVPR_2023_paper.html
http://openaccess.thecvf.com//content/CVPR2023/papers/Yu_TOPLight_Lightweight_Neural_Networks_With_Task-Oriented_Pretraining_for_Visible-Infrared_Recognition_CVPR_2023_paper.pdf
TOPLight: Lightweight Neural Networks With Task-Oriented Pretraining for Visible-Infrared Recognition
Visible-infrared recognition (VI recognition) is a challenging task due to the enormous visual difference across heterogeneous images. Most existing works achieve promising results by transfer learning, such as pretraining on the ImageNet, based on advanced neural architectures like ResNet and ViT. However, such methods ignore the negative influence of the pretrained colour prior knowledge, as well as their heavy computational burden makes them hard to deploy in actual scenarios with limited resources. In this paper, we propose a novel task-oriented pretrained lightweight neural network (TOPLight) for VI recognition. Specifically, the TOPLight method simulates the domain conflict and sample variations with the proposed fake domain loss in the pretraining stage, which guides the network to learn how to handle those difficulties, such that a more general modality-shared feature representation is learned for the heterogeneous images. Moreover, an effective fine-grained dependency reconstruction module (FDR) is developed to discover substantial pattern dependencies shared in two modalities. Extensive experiments on VI person re-identification and VI face recognition datasets demonstrate the superiority of the proposed TOPLight, which significantly outperforms the current state of the arts while demanding fewer computational resources.
['Wei Peng', 'Xu Cheng', 'Hao Yu']
2023-01-01
null
null
null
cvpr-2023-1
['person-re-identification', 'face-recognition']
['computer-vision', 'computer-vision']
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[14.656471252441406, 0.9393826723098755]
d0763971-cc7a-4737-a56f-547d3ebd6c18
learning-programs-by-combining-programs
2206.01614
null
https://arxiv.org/abs/2206.01614v2
https://arxiv.org/pdf/2206.01614v2.pdf
Learning programs by combining programs
The goal of inductive logic programming is to induce a logic program (a set of logical rules) that generalises training examples. Inducing programs with many rules and literals is a major challenge. To tackle this challenge, we introduce an approach where we learn small non-separable programs and combine them. We implement our approach in a constraint-driven ILP system. Our approach can learn optimal and recursive programs and perform predicate invention. Our experiments on multiple domains, including game playing and program synthesis, show that our approach can drastically outperform existing approaches in terms of predictive accuracies and learning times, sometimes reducing learning times from over an hour to a few seconds.
['Céline Hocquette', 'Andrew Cropper']
2022-06-01
null
null
null
null
['program-synthesis', 'inductive-logic-programming']
['computer-code', 'methodology']
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[8.717412948608398, 7.151403427124023]
e9929964-1972-4d8c-9b75-5f5bd5488ba4
recognizing-scenes-from-novel-viewpoints
2112.01520
null
https://arxiv.org/abs/2112.01520v1
https://arxiv.org/pdf/2112.01520v1.pdf
Recognizing Scenes from Novel Viewpoints
Humans can perceive scenes in 3D from a handful of 2D views. For AI agents, the ability to recognize a scene from any viewpoint given only a few images enables them to efficiently interact with the scene and its objects. In this work, we attempt to endow machines with this ability. We propose a model which takes as input a few RGB images of a new scene and recognizes the scene from novel viewpoints by segmenting it into semantic categories. All this without access to the RGB images from those views. We pair 2D scene recognition with an implicit 3D representation and learn from multi-view 2D annotations of hundreds of scenes without any 3D supervision beyond camera poses. We experiment on challenging datasets and demonstrate our model's ability to jointly capture semantics and geometry of novel scenes with diverse layouts, object types and shapes.
['Georgia Gkioxari', 'David F. Fouhey', 'Justin Johnson', 'Devendra Singh Chaplot', 'Nikhila Ravi', 'Alexander Kirillov', 'Shengyi Qian']
2021-12-02
null
null
null
null
['scene-recognition']
['computer-vision']
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[8.365771293640137, -2.971015453338623]
0e688b28-9894-4c6d-b1a2-ef1908bfb464
an-implicit-alignment-for-video-super
2305.00163
null
https://arxiv.org/abs/2305.00163v1
https://arxiv.org/pdf/2305.00163v1.pdf
An Implicit Alignment for Video Super-Resolution
Video super-resolution commonly uses a frame-wise alignment to support the propagation of information over time. The role of alignment is well-studied for low-level enhancement in video, but existing works have overlooked one critical step -- re-sampling. Most works, regardless of how they compensate for motion between frames, be it flow-based warping or deformable convolution/attention, use the default choice of bilinear interpolation for re-sampling. However, bilinear interpolation acts effectively as a low-pass filter and thus hinders the aim of recovering high-frequency content for super-resolution. This paper studies the impact of re-sampling on alignment for video super-resolution. Extensive experiments reveal that for alignment to be effective, the re-sampling should preserve the original sharpness of the features and prevent distortions. From these observations, we propose an implicit alignment method that re-samples through a window-based cross-attention with sampling positions encoded by sinusoidal positional encoding. The re-sampling is implicitly computed by learned network weights. Experiments show that the proposed implicit alignment enhances the performance of state-of-the-art frameworks with minimal impact on both synthetic and real-world datasets.
['Angela Yao', 'Michael Bi Mi', 'Xin Wang', 'Ziwei Yu', 'Kai Xu']
2023-04-29
null
null
null
null
['video-super-resolution']
['computer-vision']
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[11.049919128417969, -1.8806318044662476]
cf7003d9-6ff0-44ba-af55-508aeec1c8d9
teamwork-is-not-always-good-an-empirical
2305.16559
null
https://arxiv.org/abs/2305.16559v1
https://arxiv.org/pdf/2305.16559v1.pdf
Teamwork Is Not Always Good: An Empirical Study of Classifier Drift in Class-incremental Information Extraction
Class-incremental learning (CIL) aims to develop a learning system that can continually learn new classes from a data stream without forgetting previously learned classes. When learning classes incrementally, the classifier must be constantly updated to incorporate new classes, and the drift in decision boundary may lead to severe forgetting. This fundamental challenge, however, has not yet been studied extensively, especially in the setting where no samples from old classes are stored for rehearsal. In this paper, we take a closer look at how the drift in the classifier leads to forgetting, and accordingly, design four simple yet (super-) effective solutions to alleviate the classifier drift: an Individual Classifiers with Frozen Feature Extractor (ICE) framework where we individually train a classifier for each learning session, and its three variants ICE-PL, ICE-O, and ICE-PL&O which further take the logits of previously learned classes from old sessions or a constant logit of an Other class as a constraint to the learning of new classifiers. Extensive experiments and analysis on 6 class-incremental information extraction tasks demonstrate that our solutions, especially ICE-O, consistently show significant improvement over the previous state-of-the-art approaches with up to 44.7% absolute F-score gain, providing a strong baseline and insights for future research on class-incremental learning.
['Lifu Huang', 'Minqian Liu']
2023-05-26
null
null
null
null
['class-incremental-learning', 'incremental-learning']
['computer-vision', 'methodology']
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[9.86865520477295, 3.393603563308716]
d1cabad5-36af-4e94-8751-3d5610f263ed
effective-distant-supervision-for-temporal
2010.12755
null
https://arxiv.org/abs/2010.12755v2
https://arxiv.org/pdf/2010.12755v2.pdf
Effective Distant Supervision for Temporal Relation Extraction
A principal barrier to training temporal relation extraction models in new domains is the lack of varied, high quality examples and the challenge of collecting more. We present a method of automatically collecting distantly-supervised examples of temporal relations. We scrape and automatically label event pairs where the temporal relations are made explicit in text, then mask out those explicit cues, forcing a model trained on this data to learn other signals. We demonstrate that a pre-trained Transformer model is able to transfer from the weakly labeled examples to human-annotated benchmarks in both zero-shot and few-shot settings, and that the masking scheme is important in improving generalization.
['Greg Durrett', 'Shih-ting Lin', 'Xinyu Zhao']
2020-10-24
null
https://aclanthology.org/2021.adaptnlp-1.20
https://aclanthology.org/2021.adaptnlp-1.20.pdf
eacl-adaptnlp-2021-4
['temporal-relation-extraction']
['natural-language-processing']
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[9.18089771270752, 9.128061294555664]
d161c846-cb92-4417-a290-c4ab18b7ab01
robust-graph-structure-learning-with-the
2307.02126
null
https://arxiv.org/abs/2307.02126v1
https://arxiv.org/pdf/2307.02126v1.pdf
Robust Graph Structure Learning with the Alignment of Features and Adjacency Matrix
To improve the robustness of graph neural networks (GNN), graph structure learning (GSL) has attracted great interest due to the pervasiveness of noise in graph data. Many approaches have been proposed for GSL to jointly learn a clean graph structure and corresponding representations. To extend the previous work, this paper proposes a novel regularized GSL approach, particularly with an alignment of feature information and graph information, which is motivated mainly by our derived lower bound of node-level Rademacher complexity for GNNs. Additionally, our proposed approach incorporates sparse dimensional reduction to leverage low-dimensional node features that are relevant to the graph structure. To evaluate the effectiveness of our approach, we conduct experiments on real-world graphs. The results demonstrate that our proposed GSL method outperforms several competitive baselines, especially in scenarios where the graph structures are heavily affected by noise. Overall, our research highlights the importance of integrating feature and graph information alignment in GSL, as inspired by our derived theoretical result, and showcases the superiority of our approach in handling noisy graph structures through comprehensive experiments on real-world datasets.
['Ming Li', 'Linsen Wei', 'Shiyu Liu', 'Gang Wen', 'Shaogao Lv']
2023-07-05
null
null
null
null
['graph-structure-learning']
['graphs']
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[7.077305793762207, 6.205443382263184]
61b6546a-59cb-4bbb-b18b-4bb9ac96455d
exploiting-low-rank-tensor-train-deep-neural
2203.06031
null
https://arxiv.org/abs/2203.06031v1
https://arxiv.org/pdf/2203.06031v1.pdf
Exploiting Low-Rank Tensor-Train Deep Neural Networks Based on Riemannian Gradient Descent With Illustrations of Speech Processing
This work focuses on designing low complexity hybrid tensor networks by considering trade-offs between the model complexity and practical performance. Firstly, we exploit a low-rank tensor-train deep neural network (TT-DNN) to build an end-to-end deep learning pipeline, namely LR-TT-DNN. Secondly, a hybrid model combining LR-TT-DNN with a convolutional neural network (CNN), which is denoted as CNN+(LR-TT-DNN), is set up to boost the performance. Instead of randomly assigning large TT-ranks for TT-DNN, we leverage Riemannian gradient descent to determine a TT-DNN associated with small TT-ranks. Furthermore, CNN+(LR-TT-DNN) consists of convolutional layers at the bottom for feature extraction and several TT layers at the top to solve regression and classification problems. We separately assess the LR-TT-DNN and CNN+(LR-TT-DNN) models on speech enhancement and spoken command recognition tasks. Our empirical evidence demonstrates that the LR-TT-DNN and CNN+(LR-TT-DNN) models with fewer model parameters can outperform the TT-DNN and CNN+(TT-DNN) counterparts.
['Javier Tejedor', 'Pin-Yu Chen', 'Chao-Han Huck Yang', 'Jun Qi']
2022-03-11
null
null
null
null
['tensor-networks', 'spoken-command-recognition']
['methodology', 'speech']
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[14.244793891906738, 6.225135326385498]
0d6a9d1c-0b04-427d-a9c5-9f6a017af783
multivariate-prediction-intervals-for-random
2205.02260
null
https://arxiv.org/abs/2205.02260v2
https://arxiv.org/pdf/2205.02260v2.pdf
Multivariate Prediction Intervals for Random Forests
Accurate uncertainty estimates can significantly improve the performance of iterative design of experiments, as in Sequential and Reinforcement learning. For many such problems in engineering and the physical sciences, the design task depends on multiple correlated model outputs as objectives and/or constraints. To better solve these problems, we propose a recalibrated bootstrap method to generate multivariate prediction intervals for bagged models and show that it is well-calibrated. We apply the recalibrated bootstrap to a simulated sequential learning problem with multiple objectives and show that it leads to a marked decrease in the number of iterations required to find a satisfactory candidate. This indicates that the recalibrated bootstrap could be a valuable tool for practitioners using machine learning to optimize systems with multiple competing targets.
['Maxwell Hutchinson', 'Brendan Folie']
2022-05-04
null
null
null
null
['prediction-intervals']
['miscellaneous']
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[5.032345771789551, 2.718290328979492]
ffbec38f-342b-455f-9c86-5c229fc79360
evaluation-strategy-of-time-series-anomaly
2305.09691
null
https://arxiv.org/abs/2305.09691v1
https://arxiv.org/pdf/2305.09691v1.pdf
Evaluation Strategy of Time-series Anomaly Detection with Decay Function
Recent algorithms of time-series anomaly detection have been evaluated by applying a Point Adjustment (PA) protocol. However, the PA protocol has a problem of overestimating the performance of the detection algorithms because it only depends on the number of detected abnormal segments and their size. We propose a novel evaluation protocol called the Point-Adjusted protocol with decay function (PAdf) to evaluate the time-series anomaly detection algorithm by reflecting the following ideal requirements: detect anomalies quickly and accurately without false alarms. This paper theoretically and experimentally shows that the PAdf protocol solves the over- and under-estimation problems of existing protocols such as PA and PA\%K. By conducting re-evaluations of SOTA models in benchmark datasets, we show that the PA protocol only focuses on finding many anomalous segments, whereas the score of the PAdf protocol considers not only finding many segments but also detecting anomalies quickly without delay.
['Kyushik Min', 'Yongwan Gim']
2023-05-15
null
null
null
null
['time-series-anomaly-detection']
['time-series']
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[7.366203308105469, 2.7445459365844727]
e2c795ee-10a7-4ba9-97c0-ec662fbee10c
structurallm-structural-pre-training-for-form
2105.11210
null
https://arxiv.org/abs/2105.11210v1
https://arxiv.org/pdf/2105.11210v1.pdf
StructuralLM: Structural Pre-training for Form Understanding
Large pre-trained language models achieve state-of-the-art results when fine-tuned on downstream NLP tasks. However, they almost exclusively focus on text-only representation, while neglecting cell-level layout information that is important for form image understanding. In this paper, we propose a new pre-training approach, StructuralLM, to jointly leverage cell and layout information from scanned documents. Specifically, we pre-train StructuralLM with two new designs to make the most of the interactions of cell and layout information: 1) each cell as a semantic unit; 2) classification of cell positions. The pre-trained StructuralLM achieves new state-of-the-art results in different types of downstream tasks, including form understanding (from 78.95 to 85.14), document visual question answering (from 72.59 to 83.94) and document image classification (from 94.43 to 96.08).
['Luo Si', 'Fei Huang', 'Songfang Huang', 'Wei Wang', 'Ming Yan', 'Bin Bi', 'Chenliang Li']
2021-05-24
null
https://aclanthology.org/2021.acl-long.493
https://aclanthology.org/2021.acl-long.493.pdf
acl-2021-5
['document-image-classification']
['computer-vision']
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[11.504968643188477, 2.2591936588287354]
f5407a76-f7d4-42ce-9fe1-cb05c72fa077
an-end-to-end-network-for-emotion-cause-pair
2103.01544
null
https://arxiv.org/abs/2103.01544v2
https://arxiv.org/pdf/2103.01544v2.pdf
An End-to-End Network for Emotion-Cause Pair Extraction
The task of Emotion-Cause Pair Extraction (ECPE) aims to extract all potential clause-pairs of emotions and their corresponding causes in a document. Unlike the more well-studied task of Emotion Cause Extraction (ECE), ECPE does not require the emotion clauses to be provided as annotations. Previous works on ECPE have either followed a multi-stage approach where emotion extraction, cause extraction, and pairing are done independently or use complex architectures to resolve its limitations. In this paper, we propose an end-to-end model for the ECPE task. Due to the unavailability of an English language ECPE corpus, we adapt the NTCIR-13 ECE corpus and establish a baseline for the ECPE task on this dataset. On this dataset, the proposed method produces significant performance improvements (~6.5 increase in F1 score) over the multi-stage approach and achieves comparable performance to the state-of-the-art methods.
['Ashutosh Modi', 'Saim Wani', 'Shreeshail Hingane', 'Aaditya Singh']
2021-03-02
an-end-to-end-network-for-emotion-cause-pair-1
https://arxiv.org/abs/2103.01544
https://arxiv.org/pdf/2103.01544.pdf
null
['emotion-cause-pair-extraction', 'emotion-cause-extraction']
['natural-language-processing', 'natural-language-processing']
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[12.646896362304688, 6.212346076965332]
3144e125-573c-44cb-9990-2d658dd9e3ae
gauss-guided-encoder-decoder-architecture-for
2204.07713
null
https://arxiv.org/abs/2204.07713v2
https://arxiv.org/pdf/2204.07713v2.pdf
GAUSS: Guided Encoder-Decoder Architecture for Hyperspectral Unmixing with Spatial Smoothness
In recent hyperspectral unmixing (HU) literature, the application of deep learning (DL) has become more prominent, especially with the autoencoder (AE) architecture. We propose a split architecture and use a pseudo-ground truth for abundances to guide the `unmixing network' (UN) optimization. Preceding the UN, an `approximation network' (AN) is proposed, which will improve the association between the centre pixel and its neighbourhood. Hence, it will accentuate spatial correlation in the abundances as its output is the input to the UN and the reference for the `mixing network' (MN). In the Guided Encoder-Decoder Architecture for Hyperspectral Unmixing with Spatial Smoothness (GAUSS), we proposed using one-hot encoded abundances as the pseudo-ground truth to guide the UN; computed using the k-means algorithm to exclude the use of prior HU methods. Furthermore, we release the single-layer constraint on MN by introducing the UN generated abundances in contrast to the standard AE for HU. Secondly, we experimented with two modifications on the pre-trained network using the GAUSS method. In GAUSS$_\textit{blind}$, we have concatenated the UN and the MN to back-propagate the reconstruction error gradients to the encoder. Then, in the GAUSS$_\textit{prime}$, abundance results of a signal processing (SP) method with reliable abundance results were used as the pseudo-ground truth with the GAUSS architecture. According to quantitative and graphical results for four experimental datasets, the three architectures either transcended or equated the performance of existing HU algorithms from both DL and SP domains.
['Dulantha Wickramasinghe', 'Neranjan Senarath', 'Lakshitha Ramanayake', 'Dhananjaya Jayasundara', 'Parakrama Ekanayake', 'Vijitha Herath', 'Roshan Godaliyadda', 'Kavinga Weerasooriya', 'Yasiru Ranasinghe']
2022-04-16
null
null
null
null
['hyperspectral-unmixing']
['computer-vision']
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[10.078027725219727, -2.0335850715637207]
1b2b0aeb-1729-43b1-8e39-6996f8e94535
feature-less-stitching-of-cylindrical-tunnel
1806.10278
null
http://arxiv.org/abs/1806.10278v1
http://arxiv.org/pdf/1806.10278v1.pdf
Feature-less Stitching of Cylindrical Tunnel
Traditional image stitching algorithms use transforms such as homography to combine different views of a scene. They usually work well when the scene is planar or when the camera is only rotated, keeping its position static. This severely limits their use in real world scenarios where an unmanned aerial vehicle (UAV) potentially hovers around and flies in an enclosed area while rotating to capture a video sequence. We utilize known scene geometry along with recorded camera trajectory to create cylindrical images captured in a given environment such as a tunnel where the camera rotates around its center. The captured images of the inner surface of the given scene are combined to create a composite panoramic image that is textured onto a 3D geometrical object in Unity graphical engine to create an immersive environment for end users.
['Shaohui Foong', 'Karianto Leman', 'Ramanpreet Singh Pahwa', 'Wei Kiat Leong', 'Minh N. Do']
2018-06-27
null
null
null
null
['image-stitching']
['computer-vision']
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[9.17900562286377, -2.4804835319519043]
7d5413fe-531e-44a0-a707-798e661e4eed
text2human-text-driven-controllable-human
2205.15996
null
https://arxiv.org/abs/2205.15996v1
https://arxiv.org/pdf/2205.15996v1.pdf
Text2Human: Text-Driven Controllable Human Image Generation
Generating high-quality and diverse human images is an important yet challenging task in vision and graphics. However, existing generative models often fall short under the high diversity of clothing shapes and textures. Furthermore, the generation process is even desired to be intuitively controllable for layman users. In this work, we present a text-driven controllable framework, Text2Human, for a high-quality and diverse human generation. We synthesize full-body human images starting from a given human pose with two dedicated steps. 1) With some texts describing the shapes of clothes, the given human pose is first translated to a human parsing map. 2) The final human image is then generated by providing the system with more attributes about the textures of clothes. Specifically, to model the diversity of clothing textures, we build a hierarchical texture-aware codebook that stores multi-scale neural representations for each type of texture. The codebook at the coarse level includes the structural representations of textures, while the codebook at the fine level focuses on the details of textures. To make use of the learned hierarchical codebook to synthesize desired images, a diffusion-based transformer sampler with mixture of experts is firstly employed to sample indices from the coarsest level of the codebook, which then is used to predict the indices of the codebook at finer levels. The predicted indices at different levels are translated to human images by the decoder learned accompanied with hierarchical codebooks. The use of mixture-of-experts allows for the generated image conditioned on the fine-grained text input. The prediction for finer level indices refines the quality of clothing textures. Extensive quantitative and qualitative evaluations demonstrate that our proposed framework can generate more diverse and realistic human images compared to state-of-the-art methods.
['Ziwei Liu', 'Chen Change Loy', 'Wayne Wu', 'Haonan Qiu', 'Shuai Yang', 'Yuming Jiang']
2022-05-31
null
null
null
null
['human-parsing']
['computer-vision']
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[11.935050010681152, -0.7985972166061401]
023d14eb-0b1f-4e60-8e12-4363dac01b35
data-efficient-image-recognition-with
1905.09272
null
https://arxiv.org/abs/1905.09272v3
https://arxiv.org/pdf/1905.09272v3.pdf
Data-Efficient Image Recognition with Contrastive Predictive Coding
Human observers can learn to recognize new categories of images from a handful of examples, yet doing so with artificial ones remains an open challenge. We hypothesize that data-efficient recognition is enabled by representations which make the variability in natural signals more predictable. We therefore revisit and improve Contrastive Predictive Coding, an unsupervised objective for learning such representations. This new implementation produces features which support state-of-the-art linear classification accuracy on the ImageNet dataset. When used as input for non-linear classification with deep neural networks, this representation allows us to use 2-5x less labels than classifiers trained directly on image pixels. Finally, this unsupervised representation substantially improves transfer learning to object detection on the PASCAL VOC dataset, surpassing fully supervised pre-trained ImageNet classifiers.
['Aaron van den Oord', 'Olivier J. Hénaff', 'S. M. Ali Eslami', 'Jeffrey De Fauw', 'Carl Doersch', 'Ali Razavi', 'Aravind Srinivas']
2019-05-22
null
https://proceedings.icml.cc/static/paper_files/icml/2020/3694-Paper.pdf
https://proceedings.icml.cc/static/paper_files/icml/2020/3694-Paper.pdf
icml-2020-1
['self-supervised-image-classification']
['computer-vision']
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[9.593189239501953, 2.460481643676758]
b81e3576-3a7f-49df-bc74-73ed62149bc4
a-maximum-entropy-approach-to-massive-graph
1912.09068
null
https://arxiv.org/abs/1912.09068v1
https://arxiv.org/pdf/1912.09068v1.pdf
A Maximum Entropy approach to Massive Graph Spectra
Graph spectral techniques for measuring graph similarity, or for learning the cluster number, require kernel smoothing. The choice of kernel function and bandwidth are typically chosen in an ad-hoc manner and heavily affect the resulting output. We prove that kernel smoothing biases the moments of the spectral density. We propose an information theoretically optimal approach to learn a smooth graph spectral density, which fully respects the moment information. Our method's computational cost is linear in the number of edges, and hence can be applied to large networks, with millions of nodes. We apply our method to the problems to graph similarity and cluster number learning, where we outperform comparable iterative spectral approaches on synthetic and real graphs.
['Michael Osborne', 'Xiaowen Dong', 'Stefan Zohren', 'Stephen Roberts', 'Diego Granziol', 'Robin Ru']
2019-12-19
null
null
null
null
['graph-similarity']
['graphs']
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[6.97224760055542, 5.396354675292969]
fa417104-dba7-4900-8e65-a05963ec0d69
navya3dseg-navya-3d-semantic-segmentation
2302.08292
null
https://arxiv.org/abs/2302.08292v2
https://arxiv.org/pdf/2302.08292v2.pdf
Navya3DSeg -- Navya 3D Semantic Segmentation Dataset & split generation for autonomous vehicles
Autonomous driving (AD) perception today relies heavily on deep learning based architectures requiring large scale annotated datasets with their associated costs for curation and annotation. The 3D semantic data are useful for core perception tasks such as obstacle detection and ego-vehicle localization. We propose a new dataset, Navya 3D Segmentation (Navya3DSeg), with a diverse label space corresponding to a large scale production grade operational domain, including rural, urban, industrial sites and universities from 13 countries. It contains 23 labeled sequences and 25 supplementary sequences without labels, designed to explore self-supervised and semi-supervised semantic segmentation benchmarks on point clouds. We also propose a novel method for sequential dataset split generation based on iterative multi-label stratification, and demonstrated to achieve a +1.2% mIoU improvement over the original split proposed by SemanticKITTI dataset. A complete benchmark for semantic segmentation task was performed, with state of the art methods. Finally, we demonstrate an Active Learning (AL) based dataset distillation framework. We introduce a novel heuristic-free sampling method called ego-pose distance based sampling in the context of AL. A detailed presentation on the dataset is available here https://www.youtube.com/watch?v=5m6ALIs-s20.
['B Ravi Kiran', 'Anh Duong', 'Léo Lemarié', 'Alexandre Almin']
2023-02-16
null
null
null
null
['semi-supervised-semantic-segmentation']
['computer-vision']
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[8.146706581115723, -2.5464861392974854]
855b43ab-b630-4603-9710-7eeec2be305f
zero-shot-cross-lingual-transfer-language
2301.13720
null
https://arxiv.org/abs/2301.13720v1
https://arxiv.org/pdf/2301.13720v1.pdf
Zero-shot cross-lingual transfer language selection using linguistic similarity
We study the selection of transfer languages for different Natural Language Processing tasks, specifically sentiment analysis, named entity recognition and dependency parsing. In order to select an optimal transfer language, we propose to utilize different linguistic similarity metrics to measure the distance between languages and make the choice of transfer language based on this information instead of relying on intuition. We demonstrate that linguistic similarity correlates with cross-lingual transfer performance for all of the proposed tasks. We also show that there is a statistically significant difference in choosing the optimal language as the transfer source instead of English. This allows us to select a more suitable transfer language which can be used to better leverage knowledge from high-resource languages in order to improve the performance of language applications lacking data. For the study, we used datasets from eight different languages from three language families.
['Fumito Masui', 'Michal Ptaszynski', 'Juuso Eronen']
2023-01-31
null
null
null
null
['zero-shot-cross-lingual-transfer', 'dependency-parsing', 'cross-lingual-transfer']
['natural-language-processing', 'natural-language-processing', 'natural-language-processing']
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[10.819241523742676, 9.9459867477417]
33ee490d-b13e-4d97-b233-c2dd27b42dd5
a-simple-and-effective-method-of-cross
2304.01352
null
https://arxiv.org/abs/2304.01352v2
https://arxiv.org/pdf/2304.01352v2.pdf
A Simple and Effective Method of Cross-Lingual Plagiarism Detection
We present a simple cross-lingual plagiarism detection method applicable to a large number of languages. The presented approach leverages open multilingual thesauri for candidate retrieval task and pre-trained multilingual BERT-based language models for detailed analysis. The method does not rely on machine translation and word sense disambiguation when in use, and therefore is suitable for a large number of languages, including under-resourced languages. The effectiveness of the proposed approach is demonstrated for several existing and new benchmarks, achieving state-of-the-art results for French, Russian, and Armenian languages.
['Arutyun Avetisyan', 'Tsolak Ghukasyan', 'Arthur Malajyan', 'Karen Avetisyan']
2023-04-03
null
null
null
null
['word-sense-disambiguation']
['natural-language-processing']
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[11.15715503692627, 10.014444351196289]
109196b1-51bd-46c3-a557-e7b40ca08fc1
a-dataset-for-audio-video-based-vehicle-speed
2212.01651
null
https://arxiv.org/abs/2212.01651v1
https://arxiv.org/pdf/2212.01651v1.pdf
A dataset for audio-video based vehicle speed estimation
Accurate speed estimation of road vehicles is important for several reasons. One is speed limit enforcement, which represents a crucial tool in decreasing traffic accidents and fatalities. Compared with other research areas and domains, the number of available datasets for vehicle speed estimation is still very limited. We present a dataset of on-road audio-video recordings of single vehicles passing by a camera at known speeds, maintained stable by the on-board cruise control. The dataset contains thirteen vehicles, selected to be as diverse as possible in terms of manufacturer, production year, engine type, power and transmission, resulting in a total of $ 400 $ annotated audio-video recordings. The dataset is fully available and intended as a public benchmark to facilitate research in audio-video vehicle speed estimation. In addition to the dataset, we propose a cross-validation strategy which can be used in a machine learning model for vehicle speed estimation. Two approaches to training-validation split of the dataset are proposed.
['Ivana Čavor', 'Nikola Bulatović', 'Slobodan Djukanović']
2022-12-03
null
null
null
null
['vehicle-speed-estimation']
['computer-vision']
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[7.853906631469727, -0.9286969304084778]
d1b3eafd-adc7-4eeb-b056-7d0cb21123ec
video-matting-via-sparse-and-low-rank
null
null
http://openaccess.thecvf.com/content_iccv_2015/html/Zou_Video_Matting_via_ICCV_2015_paper.html
http://openaccess.thecvf.com/content_iccv_2015/papers/Zou_Video_Matting_via_ICCV_2015_paper.pdf
Video Matting via Sparse and Low-Rank Representation
We introduce a novel method of video matting via sparse and low-rank representation. Previous matting methods [10, 9] introduced a nonlocal prior to estimate the alpha matte and have achieved impressive results on some data. However, on one hand, searching inadequate or excessive samples may miss good samples or introduce noise; on the other hand, it is difficult to construct consistent nonlocal structures for pixels with similar features, yielding spatially and temporally inconsistent video mattes. In this paper, we proposed a novel video matting method to achieve spatially and temporally consistent matting result. Toward this end, a sparse and low-rank representation model is introduced to pursue consistent nonlocal structures for pixels with similar features. The sparse representation is used to adaptively select best samples and accurately construct the nonlocal structures for all pixels, while the low-rank representation is used to globally ensure consistent nonlocal structures for pixels with similar features. The two representations are combined to generate consistent video mattes. Experimental results show that our method has achieved high quality results in a variety of challenging examples featuring illumination changes, feature ambiguity, topology changes, transparency variation, dis-occlusion, fast motion and motion blur.
['Xiaogang Wang', 'Xiaowu Chen', 'Guangying Cao', 'Dongqing Zou']
2015-12-01
null
null
null
iccv-2015-12
['video-matting']
['computer-vision']
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[10.856633186340332, -1.717824935913086]
0b1deb24-bf95-45e8-8db2-25d466e9841c
hybrid-transducer-and-attention-based-encoder
2305.03101
null
https://arxiv.org/abs/2305.03101v1
https://arxiv.org/pdf/2305.03101v1.pdf
Hybrid Transducer and Attention based Encoder-Decoder Modeling for Speech-to-Text Tasks
Transducer and Attention based Encoder-Decoder (AED) are two widely used frameworks for speech-to-text tasks. They are designed for different purposes and each has its own benefits and drawbacks for speech-to-text tasks. In order to leverage strengths of both modeling methods, we propose a solution by combining Transducer and Attention based Encoder-Decoder (TAED) for speech-to-text tasks. The new method leverages AED's strength in non-monotonic sequence to sequence learning while retaining Transducer's streaming property. In the proposed framework, Transducer and AED share the same speech encoder. The predictor in Transducer is replaced by the decoder in the AED model, and the outputs of the decoder are conditioned on the speech inputs instead of outputs from an unconditioned language model. The proposed solution ensures that the model is optimized by covering all possible read/write scenarios and creates a matched environment for streaming applications. We evaluate the proposed approach on the \textsc{MuST-C} dataset and the findings demonstrate that TAED performs significantly better than Transducer for offline automatic speech recognition (ASR) and speech-to-text translation (ST) tasks. In the streaming case, TAED outperforms Transducer in the ASR task and one ST direction while comparable results are achieved in another translation direction.
['Juan Pino', 'Paden D. Tomasello', 'Xutai Ma', 'Ning Dong', 'Xinyue Chen', 'Hirofumi Inaguma', 'Anna Y. Sun', 'Yun Tang']
2023-05-04
null
null
null
null
['speech-to-text-translation']
['natural-language-processing']
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[14.47297477722168, 6.9319281578063965]
34580d53-2e51-4fbc-9a79-59ec0ab6b3de
dual-domain-image-synthesis-using
2204.09015
null
https://arxiv.org/abs/2204.09015v1
https://arxiv.org/pdf/2204.09015v1.pdf
Dual-Domain Image Synthesis using Segmentation-Guided GAN
We introduce a segmentation-guided approach to synthesise images that integrate features from two distinct domains. Images synthesised by our dual-domain model belong to one domain within the semantic mask, and to another in the rest of the image - smoothly integrated. We build on the successes of few-shot StyleGAN and single-shot semantic segmentation to minimise the amount of training required in utilising two domains. The method combines a few-shot cross-domain StyleGAN with a latent optimiser to achieve images containing features of two distinct domains. We use a segmentation-guided perceptual loss, which compares both pixel-level and activations between domain-specific and dual-domain synthetic images. Results demonstrate qualitatively and quantitatively that our model is capable of synthesising dual-domain images on a variety of objects (faces, horses, cats, cars), domains (natural, caricature, sketches) and part-based masks (eyes, nose, mouth, hair, car bonnet). The code is publicly available at: https://github.com/denabazazian/Dual-Domain-Synthesis.
['Dima Damen', 'Andrew Calway', 'Dena Bazazian']
2022-04-19
null
null
null
null
['caricature']
['computer-vision']
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[11.654657363891602, -0.43046432733535767]
d92c46b3-b198-47ce-a6fc-06dd3568a007
a-temporal-learning-approach-to-inpainting
2203.17013
null
https://arxiv.org/abs/2203.17013v1
https://arxiv.org/pdf/2203.17013v1.pdf
A Temporal Learning Approach to Inpainting Endoscopic Specularities and Its effect on Image Correspondence
Video streams are utilised to guide minimally-invasive surgery and diagnostic procedures in a wide range of procedures, and many computer assisted techniques have been developed to automatically analyse them. These approaches can provide additional information to the surgeon such as lesion detection, instrument navigation, or anatomy 3D shape modeling. However, the necessary image features to recognise these patterns are not always reliably detected due to the presence of irregular light patterns such as specular highlight reflections. In this paper, we aim at removing specular highlights from endoscopic videos using machine learning. We propose using a temporal generative adversarial network (GAN) to inpaint the hidden anatomy under specularities, inferring its appearance spatially and from neighbouring frames where they are not present in the same location. This is achieved using in-vivo data of gastric endoscopy (Hyper-Kvasir) in a fully unsupervised manner that relies on automatic detection of specular highlights. System evaluations show significant improvements to traditional methods through direct comparison as well as other machine learning techniques through an ablation study that depicts the importance of the network's temporal and transfer learning components. The generalizability of our system to different surgical setups and procedures was also evaluated qualitatively on in-vivo data of gastric endoscopy and ex-vivo porcine data (SERV-CT, SCARED). We also assess the effect of our method in computer vision tasks that underpin 3D reconstruction and camera motion estimation, namely stereo disparity, optical flow, and sparse point feature matching. These are evaluated quantitatively and qualitatively and results show a positive effect of specular highlight inpainting on these tasks in a novel comprehensive analysis.
['Danail Stoyanov', 'Francisco Vasconcelos', 'Rema Daher']
2022-03-31
null
null
null
null
['3d-shape-modeling']
['computer-vision']
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[13.871456146240234, -3.110417127609253]
2d69106e-f73b-4428-833c-bebaf04e6edb
feedback-gradient-descent-efficient-and
2205.08385
null
https://arxiv.org/abs/2205.08385v1
https://arxiv.org/pdf/2205.08385v1.pdf
Feedback Gradient Descent: Efficient and Stable Optimization with Orthogonality for DNNs
The optimization with orthogonality has been shown useful in training deep neural networks (DNNs). To impose orthogonality on DNNs, both computational efficiency and stability are important. However, existing methods utilizing Riemannian optimization or hard constraints can only ensure stability while those using soft constraints can only improve efficiency. In this paper, we propose a novel method, named Feedback Gradient Descent (FGD), to our knowledge, the first work showing high efficiency and stability simultaneously. FGD induces orthogonality based on the simple yet indispensable Euler discretization of a continuous-time dynamical system on the tangent bundle of the Stiefel manifold. In particular, inspired by a numerical integration method on manifolds called Feedback Integrators, we propose to instantiate it on the tangent bundle of the Stiefel manifold for the first time. In the extensive image classification experiments, FGD comprehensively outperforms the existing state-of-the-art methods in terms of accuracy, efficiency, and stability.
['Dong Eui Chang', 'Fanchen Bu']
2022-05-12
null
null
null
null
['numerical-integration']
['miscellaneous']
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[7.528221607208252, 3.9472169876098633]
aa2351be-3fad-4e79-98b3-aee9b10c098c
propandl-a-modular-architecture-for
2304.08645
null
https://arxiv.org/abs/2304.08645v1
https://arxiv.org/pdf/2304.08645v1.pdf
ProPanDL: A Modular Architecture for Uncertainty-Aware Panoptic Segmentation
We introduce ProPanDL, a family of networks capable of uncertainty-aware panoptic segmentation. Unlike existing segmentation methods, ProPanDL is capable of estimating full probability distributions for both the semantic and spatial aspects of panoptic segmentation. We implement and evaluate ProPanDL variants capable of estimating both parametric (Variance Network) and parameter-free (SampleNet) distributions quantifying pixel-wise spatial uncertainty. We couple these approaches with two methods (Temperature Scaling and Evidential Deep Learning) for semantic uncertainty estimation. To evaluate the uncertainty-aware panoptic segmentation task, we address limitations with existing approaches by proposing new metrics that enable separate evaluation of spatial and semantic uncertainty. We additionally propose the use of the energy score, a proper scoring rule, for more robust evaluation of spatial output distributions. Using these metrics, we conduct an extensive evaluation of ProPanDL variants. Our results demonstrate that ProPanDL is capable of estimating well-calibrated and meaningful output distributions while still retaining strong performance on the base panoptic segmentation task.
['Steven Waslander', 'Chang Won Lee', 'Jacob Deery']
2023-04-17
null
null
null
null
['panoptic-segmentation']
['computer-vision']
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[7.272225856781006, 3.4526915550231934]
b0167dbf-02bf-4dc0-a3e0-3a4386d0727d
spin-road-mapper-extracting-roads-from-aerial
2109.07701
null
https://arxiv.org/abs/2109.07701v1
https://arxiv.org/pdf/2109.07701v1.pdf
SPIN Road Mapper: Extracting Roads from Aerial Images via Spatial and Interaction Space Graph Reasoning for Autonomous Driving
Road extraction is an essential step in building autonomous navigation systems. Detecting road segments is challenging as they are of varying widths, bifurcated throughout the image, and are often occluded by terrain, cloud, or other weather conditions. Using just convolution neural networks (ConvNets) for this problem is not effective as it is inefficient at capturing distant dependencies between road segments in the image which is essential to extract road connectivity. To this end, we propose a Spatial and Interaction Space Graph Reasoning (SPIN) module which when plugged into a ConvNet performs reasoning over graphs constructed on spatial and interaction spaces projected from the feature maps. Reasoning over spatial space extracts dependencies between different spatial regions and other contextual information. Reasoning over a projected interaction space helps in appropriate delineation of roads from other topographies present in the image. Thus, SPIN extracts long-range dependencies between road segments and effectively delineates roads from other semantics. We also introduce a SPIN pyramid which performs SPIN graph reasoning across multiple scales to extract multi-scale features. We propose a network based on stacked hourglass modules and SPIN pyramid for road segmentation which achieves better performance compared to existing methods. Moreover, our method is computationally efficient and significantly boosts the convergence speed during training, making it feasible for applying on large-scale high-resolution aerial images. Code available at: https://github.com/wgcban/SPIN_RoadMapper.git.
['Vishal M. Patel', 'Jeya Maria Jose Valanarasu', 'Wele Gedara Chaminda Bandara']
2021-09-16
null
null
null
null
['road-segementation']
['computer-vision']
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[8.917546272277832, -1.5981851816177368]
3e1a9443-4a13-4bd6-ab4f-fa79b249f946
through-the-looking-glass-neural-3d
2004.10904
null
https://arxiv.org/abs/2004.10904v2
https://arxiv.org/pdf/2004.10904v2.pdf
Through the Looking Glass: Neural 3D Reconstruction of Transparent Shapes
Recovering the 3D shape of transparent objects using a small number of unconstrained natural images is an ill-posed problem. Complex light paths induced by refraction and reflection have prevented both traditional and deep multiview stereo from solving this challenge. We propose a physically-based network to recover 3D shape of transparent objects using a few images acquired with a mobile phone camera, under a known but arbitrary environment map. Our novel contributions include a normal representation that enables the network to model complex light transport through local computation, a rendering layer that models refractions and reflections, a cost volume specifically designed for normal refinement of transparent shapes and a feature mapping based on predicted normals for 3D point cloud reconstruction. We render a synthetic dataset to encourage the model to learn refractive light transport across different views. Our experiments show successful recovery of high-quality 3D geometry for complex transparent shapes using as few as 5-12 natural images. Code and data are publicly released.
['Yu-Ying Yeh', 'Zhengqin Li', 'Manmohan Chandraker']
2020-04-22
through-the-looking-glass-neural-3d-1
http://openaccess.thecvf.com/content_CVPR_2020/html/Li_Through_the_Looking_Glass_Neural_3D_Reconstruction_of_Transparent_Shapes_CVPR_2020_paper.html
http://openaccess.thecvf.com/content_CVPR_2020/papers/Li_Through_the_Looking_Glass_Neural_3D_Reconstruction_of_Transparent_Shapes_CVPR_2020_paper.pdf
cvpr-2020-6
['3d-point-cloud-reconstruction', 'transparent-objects', 'point-cloud-reconstruction']
['computer-vision', 'computer-vision', 'computer-vision']
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[9.564826965332031, -3.079742431640625]
fd1b6e9e-ab85-49e3-89b6-06761bf4668e
the-devil-is-in-the-detail-simple-tricks
2108.12284
null
https://arxiv.org/abs/2108.12284v4
https://arxiv.org/pdf/2108.12284v4.pdf
The Devil is in the Detail: Simple Tricks Improve Systematic Generalization of Transformers
Recently, many datasets have been proposed to test the systematic generalization ability of neural networks. The companion baseline Transformers, typically trained with default hyper-parameters from standard tasks, are shown to fail dramatically. Here we demonstrate that by revisiting model configurations as basic as scaling of embeddings, early stopping, relative positional embedding, and Universal Transformer variants, we can drastically improve the performance of Transformers on systematic generalization. We report improvements on five popular datasets: SCAN, CFQ, PCFG, COGS, and Mathematics dataset. Our models improve accuracy from 50% to 85% on the PCFG productivity split, and from 35% to 81% on COGS. On SCAN, relative positional embedding largely mitigates the EOS decision problem (Newman et al., 2020), yielding 100% accuracy on the length split with a cutoff at 26. Importantly, performance differences between these models are typically invisible on the IID data split. This calls for proper generalization validation sets for developing neural networks that generalize systematically. We publicly release the code to reproduce our results.
['Jürgen Schmidhuber', 'Kazuki Irie', 'Róbert Csordás']
2021-08-26
null
https://aclanthology.org/2021.emnlp-main.49
https://aclanthology.org/2021.emnlp-main.49.pdf
emnlp-2021-11
['systematic-generalization']
['reasoning']
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[9.169183731079102, 3.36297607421875]
4d8a6ade-7d8d-4e92-ada5-57e3fc0a221d
learning-structure-guided-diffusion-model-for
2306.17074
null
https://arxiv.org/abs/2306.17074v1
https://arxiv.org/pdf/2306.17074v1.pdf
Learning Structure-Guided Diffusion Model for 2D Human Pose Estimation
One of the mainstream schemes for 2D human pose estimation (HPE) is learning keypoints heatmaps by a neural network. Existing methods typically improve the quality of heatmaps by customized architectures, such as high-resolution representation and vision Transformers. In this paper, we propose \textbf{DiffusionPose}, a new scheme that formulates 2D HPE as a keypoints heatmaps generation problem from noised heatmaps. During training, the keypoints are diffused to random distribution by adding noises and the diffusion model learns to recover ground-truth heatmaps from noised heatmaps with respect to conditions constructed by image feature. During inference, the diffusion model generates heatmaps from initialized heatmaps in a progressive denoising way. Moreover, we further explore improving the performance of DiffusionPose with conditions from human structural information. Extensive experiments show the prowess of our DiffusionPose, with improvements of 1.6, 1.2, and 1.2 mAP on widely-used COCO, CrowdPose, and AI Challenge datasets, respectively.
['Jingdong Wang', 'Errui Ding', 'Junyu Han', 'Kun Yao', 'Dongmei Fu', 'Chang Xu', 'Xiyu Wang', 'Jian Wang', 'Qiansheng Yang', 'Zhongwei Qiu']
2023-06-29
null
null
null
null
['pose-estimation', '2d-human-pose-estimation']
['computer-vision', 'computer-vision']
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[7.046763896942139, -0.9290841817855835]
ab443413-ac1c-4e0a-9ea6-6253ab53c846
beyond-the-meta-leveraging-game-design
2305.18477
null
https://arxiv.org/abs/2305.18477v2
https://arxiv.org/pdf/2305.18477v2.pdf
Beyond the Meta: Leveraging Game Design Parameters for Patch-Agnostic Esport Analytics
Esport games comprise a sizeable fraction of the global games market, and is the fastest growing segment in games. This has given rise to the domain of esports analytics, which uses telemetry data from games to inform players, coaches, broadcasters and other stakeholders. Compared to traditional sports, esport titles change rapidly, in terms of mechanics as well as rules. Due to these frequent changes to the parameters of the game, esport analytics models can have a short life-spam, a problem which is largely ignored within the literature. This paper extracts information from game design (i.e. patch notes) and utilises clustering techniques to propose a new form of character representation. As a case study, a neural network model is trained to predict the number of kills in a Dota 2 match utilising this novel character representation technique. The performance of this model is then evaluated against two distinct baselines, including conventional techniques. Not only did the model significantly outperform the baselines in terms of accuracy (85% AUC), but the model also maintains the accuracy in two newer iterations of the game that introduced one new character and a brand new character type. These changes introduced to the design of the game would typically break conventional techniques that are commonly used within the literature. Therefore, the proposed methodology for representing characters can increase the life-spam of machine learning models as well as contribute to a higher performance when compared to traditional techniques typically employed within the literature.
['Anders Drachen', 'James Walker', 'Florian Block', 'Alan Pedrassoli Chitayat']
2023-05-29
null
null
null
null
['dota-2']
['playing-games']
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[6.550948143005371, 0.37324920296669006]
3ee1965a-8060-4b2b-aa71-0c9343452de7
scalable-educational-question-generation-with
2305.07871
null
https://arxiv.org/abs/2305.07871v1
https://arxiv.org/pdf/2305.07871v1.pdf
Scalable Educational Question Generation with Pre-trained Language Models
The automatic generation of educational questions will play a key role in scaling online education, enabling self-assessment at scale when a global population is manoeuvring their personalised learning journeys. We develop \textit{EduQG}, a novel educational question generation model built by adapting a large language model. Our extensive experiments demonstrate that \textit{EduQG} can produce superior educational questions by further pre-training and fine-tuning a pre-trained language model on the scientific text and science question data.
['Emine Yilmaz', 'Hamze Muse', 'Sahan Bulathwela']
2023-05-13
null
null
null
null
['question-generation']
['natural-language-processing']
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[10.906654357910156, 7.786113262176514]
9ea0757f-4c80-44a1-8f62-68c18e6bcc89
language-independent-sentence-level
null
null
https://aclanthology.org/Y12-1018
https://aclanthology.org/Y12-1018.pdf
Language Independent Sentence-Level Subjectivity Analysis with Feature Selection
null
['Vasudeva Varma', 'Aditya Mogadala']
2012-11-01
language-independent-sentence-level-1
https://aclanthology.org/Y12-1018
https://aclanthology.org/Y12-1018.pdf
paclic-2012-11
['subjectivity-analysis']
['natural-language-processing']
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[-7.322773456573486, 3.6696999073028564]
f41b6c13-6f30-4207-8766-d38570855322
training-end-to-end-dialogue-systems-with-the
null
null
https://core.ac.uk/download/pdf/230775856.pdf
https://core.ac.uk/download/pdf/230775856.pdf
Training End-to-End Dialogue Systems with the Ubuntu Dialogue Corpus
In this paper, we analyze neural network-based dialogue systems trained in an end-to-end manner using an updated version of the recent Ubuntu Dialogue Corpus, a dataset containing almost 1 million multi-turn dialogues, with a total of over 7 million utterances and 100 million words. This dataset is interesting because of its size, long context lengths, and technical nature; thus, it can be used to train large models directly from data with minimal feature engineering. We provide baselines in two different environments: one where models are trained to select the correct next response from a list of candidate responses, and one where models are trained to maximize the loglikelihood of a generated utterance conditioned on the context of the conversation. These are both evaluated on a recall task that we call next utterance classification (NUC), and using vector-based metrics that capture the topicality of the responses. We observe that current end-to-end models are unable to completely solve these tasks; thus, we provide a qualitative error analysis to determine the primary causes of error for end-to-end models evaluated on NUC, and examine sample utterances from the generative models. As a result of this analysis, we suggest some promising directions for future research on the Ubuntu Dialogue Corpus, which can also be applied to end-to-end dialogue systems in general.
['Joelle Pineau', 'Chia-Wei Liu', 'Laurent Charlin', 'Iulian Vlad Serban', 'Nissan Pow', 'Ryan Lowe']
2017-01-01
null
null
null
null
['conversation-disentanglement']
['natural-language-processing']
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[12.778046607971191, 8.02440357208252]
664fef10-e365-4428-9d89-043ef999a12a
dimba-discretely-masked-black-box-attack-in
2207.08044
null
https://arxiv.org/abs/2207.08044v1
https://arxiv.org/pdf/2207.08044v1.pdf
DIMBA: Discretely Masked Black-Box Attack in Single Object Tracking
The adversarial attack can force a CNN-based model to produce an incorrect output by craftily manipulating human-imperceptible input. Exploring such perturbations can help us gain a deeper understanding of the vulnerability of neural networks, and provide robustness to deep learning against miscellaneous adversaries. Despite extensive studies focusing on the robustness of image, audio, and NLP, works on adversarial examples of visual object tracking -- especially in a black-box manner -- are quite lacking. In this paper, we propose a novel adversarial attack method to generate noises for single object tracking under black-box settings, where perturbations are merely added on initial frames of tracking sequences, which is difficult to be noticed from the perspective of a whole video clip. Specifically, we divide our algorithm into three components and exploit reinforcement learning for localizing important frame patches precisely while reducing unnecessary computational queries overhead. Compared to existing techniques, our method requires fewer queries on initialized frames of a video to manipulate competitive or even better attack performance. We test our algorithm in both long-term and short-term datasets, including OTB100, VOT2018, UAV123, and LaSOT. Extensive experiments demonstrate the effectiveness of our method on three mainstream types of trackers: discrimination, Siamese-based, and reinforcement learning-based trackers.
['Jonathan Fieldsend', 'Wenjie Ruan', 'Xiangyu Yin']
2022-07-17
null
null
null
null
['visual-object-tracking', 'miscellaneous']
['computer-vision', 'miscellaneous']
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[5.408635139465332, 7.956803798675537]
d04c8453-4c50-4e9d-81f7-7de843c220bb
uboco-unsupervised-boundary-contrastive-1
null
null
http://openaccess.thecvf.com//content/CVPR2022/html/Kang_UBoCo_Unsupervised_Boundary_Contrastive_Learning_for_Generic_Event_Boundary_Detection_CVPR_2022_paper.html
http://openaccess.thecvf.com//content/CVPR2022/papers/Kang_UBoCo_Unsupervised_Boundary_Contrastive_Learning_for_Generic_Event_Boundary_Detection_CVPR_2022_paper.pdf
UBoCo: Unsupervised Boundary Contrastive Learning for Generic Event Boundary Detection
Generic Event Boundary Detection (GEBD) is a newly suggested video understanding task that aims to find one level deeper semantic boundaries of events. Bridging the gap between natural human perception and video understanding, it has various potential applications, including interpretable and semantically valid video parsing. Still at an early development stage, existing GEBD solvers are simple extensions of relevant video understanding tasks, disregarding GEBD's distinctive characteristics. In this paper, we propose a novel framework for unsupervised/supervised GEBD, by using the Temporal Self-similarity Matrix (TSM) as the video representation. The new Recursive TSM Parsing (RTP) algorithm exploits local diagonal patterns in TSM to detect boundaries, and it is combined with the Boundary Contrastive (BoCo) loss to train our encoder to generate more informative TSMs. Our framework can be applied to both unsupervised and supervised settings, with both achieving state-of-the-art performance by a huge margin in GEBD benchmark. Especially, our unsupervised method outperforms previous state-of-the-art "supervised" model, implying its exceptional efficacy.
['Seon Joo Kim', 'Taehyun Kim', 'Jinwoo Kim', 'Hyolim Kang']
2022-01-01
null
null
null
cvpr-2022-1
['boundary-detection']
['computer-vision']
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[9.414580345153809, 0.6215787529945374]
5d89812b-c276-488c-989f-0007a5c9d509
digital-image-forensics-using-deep-learning
2210.09052
null
https://arxiv.org/abs/2210.09052v1
https://arxiv.org/pdf/2210.09052v1.pdf
Digital Image Forensics using Deep Learning
During the investigation of criminal activity when evidence is available, the issue at hand is determining the credibility of the video and ascertaining that the video is real. Today, one way to authenticate the footage is to identify the camera that was used to capture the image or video in question. While a very common way to do this is by using image meta-data, this data can easily be falsified by changing the video content or even splicing together content from two different cameras. Given the multitude of solutions proposed to this problem, it is yet to be sufficiently solved. The aim of our project is to build an algorithm that identifies which camera was used to capture an image using traces of information left intrinsically in the image, using filters, followed by a deep neural network on these filters. Solving this problem would have a big impact on the verification of evidence used in criminal and civil trials and even news reporting.
['Bishesh Sinha', 'Yash Mathur', 'Vivek Kapoor', 'Mukund Sood', 'Akash Nagaraj']
2022-10-14
null
null
null
null
['image-forensics']
['computer-vision']
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[12.487969398498535, 1.084869623184204]
a3d70467-c161-4369-8487-86012a1abc12
detecting-curve-text-in-the-wild-new-dataset
1712.02170
null
http://arxiv.org/abs/1712.02170v1
http://arxiv.org/pdf/1712.02170v1.pdf
Detecting Curve Text in the Wild: New Dataset and New Solution
Scene text detection has been made great progress in recent years. The detection manners are evolving from axis-aligned rectangle to rotated rectangle and further to quadrangle. However, current datasets contain very little curve text, which can be widely observed in scene images such as signboard, product name and so on. To raise the concerns of reading curve text in the wild, in this paper, we construct a curve text dataset named CTW1500, which includes over 10k text annotations in 1,500 images (1000 for training and 500 for testing). Based on this dataset, we pioneering propose a polygon based curve text detector (CTD) which can directly detect curve text without empirical combination. Moreover, by seamlessly integrating the recurrent transverse and longitudinal offset connection (TLOC), the proposed method can be end-to-end trainable to learn the inherent connection among the position offsets. This allows the CTD to explore context information instead of predicting points independently, resulting in more smooth and accurate detection. We also propose two simple but effective post-processing methods named non-polygon suppress (NPS) and polygonal non-maximum suppression (PNMS) to further improve the detection accuracy. Furthermore, the proposed approach in this paper is designed in an universal manner, which can also be trained with rectangular or quadrilateral bounding boxes without extra efforts. Experimental results on CTW-1500 demonstrate our method with only a light backbone can outperform state-of-the-art methods with a large margin. By evaluating only in the curve or non-curve subset, the CTD + TLOC can still achieve the best results. Code is available at https://github.com/Yuliang-Liu/Curve-Text-Detector.
['Zhang Shuaitao', 'Jin Lianwen', 'Zhang Sheng', 'Liu Yuliang']
2017-12-06
null
null
null
null
['curved-text-detection']
['computer-vision']
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[12.099713325500488, 2.245655059814453]
d026bd49-fe16-4b8b-a965-e3dd4c5d053a
corporate-culture-and-organizational
2301.08907
null
https://arxiv.org/abs/2301.08907v1
https://arxiv.org/pdf/2301.08907v1.pdf
Corporate Culture and Organizational Fragility
Complex organizations accomplish tasks through many steps of collaboration among workers. Corporate culture supports collaborations by establishing norms and reducing misunderstandings. Because a strong corporate culture relies on costly, voluntary investments by many workers, we model it as an organizational public good, subject to standard free-riding problems, which become severe in large organizations. Our main finding is that voluntary contributions to culture can nevertheless be sustained, because an organization's equilibrium productivity is endogenously highly sensitive to individual contributions. However, the completion of complex tasks is then necessarily fragile to small shocks that damage the organization's culture.
['Matthieu V. Leduc', 'Benjamin Golub', 'Matthew Elliott']
2023-01-21
null
null
null
null
['culture']
['speech']
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[8.997416496276855, 6.15219259262085]
51a2aab2-bdb1-4d91-80ec-8b47b63d0b2f
target-speaker-voice-activity-detection-with-1
2208.13085
null
https://arxiv.org/abs/2208.13085v3
https://arxiv.org/pdf/2208.13085v3.pdf
Target Speaker Voice Activity Detection with Transformers and Its Integration with End-to-End Neural Diarization
This paper describes a speaker diarization model based on target speaker voice activity detection (TS-VAD) using transformers. To overcome the original TS-VAD model's drawback of being unable to handle an arbitrary number of speakers, we investigate model architectures that use input tensors with variable-length time and speaker dimensions. Transformer layers are applied to the speaker axis to make the model output insensitive to the order of the speaker profiles provided to the TS-VAD model. Time-wise sequential layers are interspersed between these speaker-wise transformer layers to allow the temporal and cross-speaker correlations of the input speech signal to be captured. We also extend a diarization model based on end-to-end neural diarization with encoder-decoder based attractors (EEND-EDA) by replacing its dot-product-based speaker detection layer with the transformer-based TS-VAD. Experimental results on VoxConverse show that using the transformers for the cross-speaker modeling reduces the diarization error rate (DER) of TS-VAD by 11.3%, achieving a new state-of-the-art (SOTA) DER of 4.57%. Also, our extended EEND-EDA reduces DER by 6.9% on the CALLHOME dataset relative to the original EEND-EDA with a similar model size, achieving a new SOTA DER of 11.18% under a widely used training data setting.
['Jian Wu', 'Takuya Yoshioka', 'Naoyuki Kanda', 'Xiong Xiao', 'Dongmei Wang']
2022-08-27
null
null
null
null
['activity-detection']
['computer-vision']
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[14.47159194946289, 6.153413772583008]
a12f9aa7-cc53-4c1b-929d-33adce26b125
biomedgpt-a-unified-and-generalist-biomedical
2305.17100
null
https://arxiv.org/abs/2305.17100v1
https://arxiv.org/pdf/2305.17100v1.pdf
BiomedGPT: A Unified and Generalist Biomedical Generative Pre-trained Transformer for Vision, Language, and Multimodal Tasks
In this paper, we introduce a unified and generalist Biomedical Generative Pre-trained Transformer (BiomedGPT) model, which leverages self-supervision on large and diverse datasets to accept multi-modal inputs and perform a range of downstream tasks. Our experiments demonstrate that BiomedGPT delivers expansive and inclusive representations of biomedical data, outperforming the majority of preceding state-of-the-art models across five distinct tasks with 20 public datasets spanning over 15 unique biomedical modalities. Through the ablation study, we also showcase the efficacy of our multi-modal and multi-task pretraining approach in transferring knowledge to previously unseen data. Overall, our work presents a significant step forward in developing unified and generalist models for biomedicine, with far-reaching implications for improving healthcare outcomes.
['Lichao Sun', 'Hongfang Liu', 'Yong Chen', 'Quanzheng Li', 'Brian D. Davison', 'Lifang He', 'Xiang Li', 'Yuyin Zhou', 'Chen Chen', 'Xun Chen', 'Sunyang Fu', 'Eashan Adhikarla', 'Yixin Liu', 'Zhiling Yan', 'Jun Yu', 'Kai Zhang']
2023-05-26
null
null
null
null
['image-captioning', 'text-summarization']
['computer-vision', 'natural-language-processing']
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[8.563766479492188, 8.709541320800781]
8ad30aff-5faf-47b0-a998-217bc507bab9
progressive-multi-stage-interactive-training
2112.04223
null
https://arxiv.org/abs/2112.04223v1
https://arxiv.org/pdf/2112.04223v1.pdf
Progressive Multi-stage Interactive Training in Mobile Network for Fine-grained Recognition
Fine-grained Visual Classification (FGVC) aims to identify objects from subcategories. It is a very challenging task because of the subtle inter-class differences. Existing research applies large-scale convolutional neural networks or visual transformers as the feature extractor, which is extremely computationally expensive. In fact, real-world scenarios of fine-grained recognition often require a more lightweight mobile network that can be utilized offline. However, the fundamental mobile network feature extraction capability is weaker than large-scale models. In this paper, based on the lightweight MobilenetV2, we propose a Progressive Multi-Stage Interactive training method with a Recursive Mosaic Generator (RMG-PMSI). First, we propose a Recursive Mosaic Generator (RMG) that generates images with different granularities in different phases. Then, the features of different stages pass through a Multi-Stage Interaction (MSI) module, which strengthens and complements the corresponding features of different stages. Finally, using the progressive training (P), the features extracted by the model in different stages can be fully utilized and fused with each other. Experiments on three prestigious fine-grained benchmarks show that RMG-PMSI can significantly improve the performance with good robustness and transferability.
['Yang Yu', 'Chengkai Zhu', 'Yinqi Zhang', 'Yifeng Liu', 'Qingliang Chen', 'Zhenxin Wu']
2021-12-08
null
null
null
null
['fine-grained-image-classification']
['computer-vision']
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[9.644554138183594, 1.9609624147415161]
076c1ce9-6369-4232-ab67-270087904985
a-multi-stage-deep-architecture-for-summary
2205.00694
null
https://arxiv.org/abs/2205.00694v1
https://arxiv.org/pdf/2205.00694v1.pdf
A Multi-stage deep architecture for summary generation of soccer videos
Video content is present in an ever-increasing number of fields, both scientific and commercial. Sports, particularly soccer, is one of the industries that has invested the most in the field of video analytics, due to the massive popularity of the game and the emergence of new markets. Previous state-of-the-art methods on soccer matches video summarization rely on handcrafted heuristics to generate summaries which are poorly generalizable, but these works have yet proven that multiple modalities help detect the best actions of the game. On the other hand, machine learning models with higher generalization potential have entered the field of summarization of general-purpose videos, offering several deep learning approaches. However, most of them exploit content specificities that are not appropriate for sport whole-match videos. Although video content has been for many years the main source for automatizing knowledge extraction in soccer, the data that records all the events happening on the field has become lately very important in sports analytics, since this event data provides richer context information and requires less processing. We propose a method to generate the summary of a soccer match exploiting both the audio and the event metadata. The results show that our method can detect the actions of the match, identify which of these actions should belong to the summary and then propose multiple candidate summaries which are similar enough but with relevant variability to provide different options to the final editor. Furthermore, we show the generalization capability of our work since it can transfer knowledge between datasets from different broadcasting companies, different competitions, acquired in different conditions, and corresponding to summaries of different lengths
['Thomas Menguy', 'Pierre-Alexandre Mattei', 'Frédéric Precioso', 'Melissa Sanabria']
2022-05-02
null
null
null
null
['sports-analytics']
['computer-vision']
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[8.14765739440918, 0.10782019048929214]
6e84057b-9c21-402c-9d86-725d514ab43b
learning-language-specific-layers-for
2305.02665
null
https://arxiv.org/abs/2305.02665v1
https://arxiv.org/pdf/2305.02665v1.pdf
Learning Language-Specific Layers for Multilingual Machine Translation
Multilingual Machine Translation promises to improve translation quality between non-English languages. This is advantageous for several reasons, namely lower latency (no need to translate twice), and reduced error cascades (e.g., avoiding losing gender and formality information when translating through English). On the downside, adding more languages reduces model capacity per language, which is usually countered by increasing the overall model size, making training harder and inference slower. In this work, we introduce Language-Specific Transformer Layers (LSLs), which allow us to increase model capacity, while keeping the amount of computation and the number of parameters used in the forward pass constant. The key idea is to have some layers of the encoder be source or target language-specific, while keeping the remaining layers shared. We study the best way to place these layers using a neural architecture search inspired approach, and achieve an improvement of 1.3 chrF (1.5 spBLEU) points over not using LSLs on a separate decoder architecture, and 1.9 chrF (2.2 spBLEU) on a shared decoder one.
['Stephan Peitz', 'Yi-Hsiu Liao', 'Robin M. Schmidt', 'Telmo Pessoa Pires']
2023-05-04
null
null
null
null
['architecture-search']
['methodology']
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[11.552321434020996, 10.279289245605469]
e0d02b38-147a-4efd-b4dc-71ed8f8032af
illumination-aware-multi-task-gans-for
null
null
https://ieeexplore.ieee.org/document/8606933
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8606933
Illumination-Aware Multi-Task GANs for Foreground Segmentation
Foreground-background segmentation has been an active research area over the years. However, conventional models fail to produce accurate results when challenged with the videos of challenging illumination conditions. In this paper, we present a robust model that allows accurately extracting the foreground even in exceptionally dark or bright scenes and in continuously varying illumination in a video sequence. This is accomplished by a triple multi-task generative adversarial network (TMT-GAN) that effectively models the semantic relationship between the dark and bright images and performs binary segmentation end-to-end. Our contribution is twofold: first, we show that by jointly optimizing the GAN loss and the segmentation loss, our network simultaneously learns both tasks that mutually benefit each other. Second, fusing features of images with varying illumination into the segmentation branch vastly improve the performance of the network. Comparative evaluations on highly challenging real and synthetic benchmark datasets (ESI and SABS) demonstrate the robustness of TMT-GAN and its superiority over state-of-the-art approaches.
['Hubert P. H.', 'Edmond S. L. Ho', 'Dimitrios Sakkos']
2019-01-10
null
null
null
ieee-access-2019-1
['video-background-subtraction', 'foreground-segmentation']
['computer-vision', 'computer-vision']
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[10.50694751739502, -0.8590356111526489]
34c5ea8a-ba35-49e2-ad01-0ef0ce4bad18
sound-source-detection-localization-and
1908.00766
null
https://arxiv.org/abs/1908.00766v2
https://arxiv.org/pdf/1908.00766v2.pdf
Sound source detection, localization and classification using consecutive ensemble of CRNN models
In this paper, we describe our method for DCASE2019 task3: Sound Event Localization and Detection (SELD). We use four CRNN SELDnet-like single output models which run in a consecutive manner to recover all possible information of occurring events. We decompose the SELD task into estimating number of active sources, estimating direction of arrival of a single source, estimating direction of arrival of the second source where the direction of the first one is known and a multi-label classification task. We use custom consecutive ensemble to predict events' onset, offset, direction of arrival and class. The proposed approach is evaluated on the TAU Spatial Sound Events 2019 - Ambisonic and it is compared with other participants' submissions.
['Sławomir Kapka', 'Mateusz Lewandowski']
2019-08-02
null
null
null
null
['sound-event-localization-and-detection']
['audio']
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[15.144868850708008, 5.206925868988037]
29575f57-52c4-477c-9e5f-819bebde8950
collaborative-deep-reinforcement-learning-for-1
1702.05573
null
http://arxiv.org/abs/1702.05573v1
http://arxiv.org/pdf/1702.05573v1.pdf
Collaborative Deep Reinforcement Learning for Joint Object Search
We examine the problem of joint top-down active search of multiple objects under interaction, e.g., person riding a bicycle, cups held by the table, etc.. Such objects under interaction often can provide contextual cues to each other to facilitate more efficient search. By treating each detector as an agent, we present the first collaborative multi-agent deep reinforcement learning algorithm to learn the optimal policy for joint active object localization, which effectively exploits such beneficial contextual information. We learn inter-agent communication through cross connections with gates between the Q-networks, which is facilitated by a novel multi-agent deep Q-learning algorithm with joint exploitation sampling. We verify our proposed method on multiple object detection benchmarks. Not only does our model help to improve the performance of state-of-the-art active localization models, it also reveals interesting co-detection patterns that are intuitively interpretable.
['Bo Xin', 'Xiangyu Kong', 'Yizhou Wang', 'Gang Hua']
2017-02-18
collaborative-deep-reinforcement-learning-for-2
http://openaccess.thecvf.com/content_cvpr_2017/html/Kong_Collaborative_Deep_Reinforcement_CVPR_2017_paper.html
http://openaccess.thecvf.com/content_cvpr_2017/papers/Kong_Collaborative_Deep_Reinforcement_CVPR_2017_paper.pdf
cvpr-2017-7
['active-object-localization']
['computer-vision']
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[3.819063425064087, 1.9176979064941406]
ddadd12c-5d0c-4d91-9aca-351d102095be
decoupled-gradient-harmonized-detector-for
2004.04455
null
https://arxiv.org/abs/2004.04455v1
https://arxiv.org/pdf/2004.04455v1.pdf
Decoupled Gradient Harmonized Detector for Partial Annotation: Application to Signet Ring Cell Detection
Early diagnosis of signet ring cell carcinoma dramatically improves the survival rate of patients. Due to lack of public dataset and expert-level annotations, automatic detection on signet ring cell (SRC) has not been thoroughly investigated. In MICCAI DigestPath2019 challenge, apart from foreground (SRC region)-background (normal tissue area) class imbalance, SRCs are partially annotated due to costly medical image annotation, which introduces extra label noise. To address the issues simultaneously, we propose Decoupled Gradient Harmonizing Mechanism (DGHM) and embed it into classification loss, denoted as DGHM-C loss. Specifically, besides positive (SRCs) and negative (normal tissues) examples, we further decouple noisy examples from clean examples and harmonize the corresponding gradient distributions in classification respectively. Without whistles and bells, we achieved the 2nd place in the challenge. Ablation studies and controlled label missing rate experiments demonstrate that DGHM-C loss can bring substantial improvement in partially annotated object detection.
['Yuanfan Guo', 'Jiancheng Yang', 'Yi Xu', 'Tiancheng Lin', 'Canqian Yang']
2020-04-09
null
null
null
null
['cell-detection']
['computer-vision']
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[15.004589080810547, -2.9182851314544678]
c5132add-6e8f-4367-93b2-6bfd2b057805
permuted-adain-enhancing-the-representation
2010.05785
null
https://arxiv.org/abs/2010.05785v3
https://arxiv.org/pdf/2010.05785v3.pdf
Permuted AdaIN: Reducing the Bias Towards Global Statistics in Image Classification
Recent work has shown that convolutional neural network classifiers overly rely on texture at the expense of shape cues. We make a similar but different distinction between shape and local image cues, on the one hand, and global image statistics, on the other. Our method, called Permuted Adaptive Instance Normalization (pAdaIN), reduces the representation of global statistics in the hidden layers of image classifiers. pAdaIN samples a random permutation $\pi$ that rearranges the samples in a given batch. Adaptive Instance Normalization (AdaIN) is then applied between the activations of each (non-permuted) sample $i$ and the corresponding activations of the sample $\pi(i)$, thus swapping statistics between the samples of the batch. Since the global image statistics are distorted, this swapping procedure causes the network to rely on cues, such as shape or texture. By choosing the random permutation with probability $p$ and the identity permutation otherwise, one can control the effect's strength. With the correct choice of $p$, fixed apriori for all experiments and selected without considering test data, our method consistently outperforms baselines in multiple settings. In image classification, our method improves on both CIFAR100 and ImageNet using multiple architectures. In the setting of robustness, our method improves on both ImageNet-C and Cifar-100-C for multiple architectures. In the setting of domain adaptation and domain generalization, our method achieves state of the art results on the transfer learning task from GTAV to Cityscapes and on the PACS benchmark.
['Lior Wolf', 'Sagie Benaim', 'Oren Nuriel']
2020-10-09
null
http://openaccess.thecvf.com//content/CVPR2021/html/Nuriel_Permuted_AdaIN_Reducing_the_Bias_Towards_Global_Statistics_in_Image_CVPR_2021_paper.html
http://openaccess.thecvf.com//content/CVPR2021/papers/Nuriel_Permuted_AdaIN_Reducing_the_Bias_Towards_Global_Statistics_in_Image_CVPR_2021_paper.pdf
cvpr-2021-1
['synthetic-to-real-translation']
['computer-vision']
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[9.297712326049805, 2.2386579513549805]
b9240d3e-776f-4967-ae1a-0c2ffddf5024
a-neuromorphic-architecture-for-reinforcement
2307.02947
null
https://arxiv.org/abs/2307.02947v1
https://arxiv.org/pdf/2307.02947v1.pdf
A Neuromorphic Architecture for Reinforcement Learning from Real-Valued Observations
Reinforcement Learning (RL) provides a powerful framework for decision-making in complex environments. However, implementing RL in hardware-efficient and bio-inspired ways remains a challenge. This paper presents a novel Spiking Neural Network (SNN) architecture for solving RL problems with real-valued observations. The proposed model incorporates multi-layered event-based clustering, with the addition of Temporal Difference (TD)-error modulation and eligibility traces, building upon prior work. An ablation study confirms the significant impact of these components on the proposed model's performance. A tabular actor-critic algorithm with eligibility traces and a state-of-the-art Proximal Policy Optimization (PPO) algorithm are used as benchmarks. Our network consistently outperforms the tabular approach and successfully discovers stable control policies on classic RL environments: mountain car, cart-pole, and acrobot. The proposed model offers an appealing trade-off in terms of computational and hardware implementation requirements. The model does not require an external memory buffer nor a global error gradient computation, and synaptic updates occur online, driven by local learning rules and a broadcasted TD-error signal. Thus, this work contributes to the development of more hardware-efficient RL solutions.
['Saeed Afshar', 'Teresa B. Ludermir', 'Yeshwanth Bethi', 'Sergio F. Chevtchenko']
2023-07-06
null
null
null
null
['reinforcement-learning-1', 'acrobot', 'decision-making']
['methodology', 'playing-games', 'reasoning']
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[8.104851722717285, 2.462430000305176]
95f61d8a-67d2-4027-82ed-68f55ca0346b
time-series-clustering-via-community
1508.04757
null
http://arxiv.org/abs/1508.04757v1
http://arxiv.org/pdf/1508.04757v1.pdf
Time Series Clustering via Community Detection in Networks
In this paper, we propose a technique for time series clustering using community detection in complex networks. Firstly, we present a method to transform a set of time series into a network using different distance functions, where each time series is represented by a vertex and the most similar ones are connected. Then, we apply community detection algorithms to identify groups of strongly connected vertices (called a community) and, consequently, identify time series clusters. Still in this paper, we make a comprehensive analysis on the influence of various combinations of time series distance functions, network generation methods and community detection techniques on clustering results. Experimental study shows that the proposed network-based approach achieves better results than various classic or up-to-date clustering techniques under consideration. Statistical tests confirm that the proposed method outperforms some classic clustering algorithms, such as $k$-medoids, diana, median-linkage and centroid-linkage in various data sets. Interestingly, the proposed method can effectively detect shape patterns presented in time series due to the topological structure of the underlying network constructed in the clustering process. At the same time, other techniques fail to identify such patterns. Moreover, the proposed method is robust enough to group time series presenting similar pattern but with time shifts and/or amplitude variations. In summary, the main point of the proposed method is the transformation of time series from time-space domain to topological domain. Therefore, we hope that our approach contributes not only for time series clustering, but also for general time series analysis tasks.
['Liang Zhao', 'Leonardo N. Ferreira']
2015-08-19
null
null
null
null
['time-series-clustering']
['time-series']
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[7.253254413604736, 3.4229860305786133]
977a2de3-38a9-4529-9a01-5e16101e32b9
referee-reference-free-sentence-summarization
2210.13800
null
https://arxiv.org/abs/2210.13800v1
https://arxiv.org/pdf/2210.13800v1.pdf
Referee: Reference-Free Sentence Summarization with Sharper Controllability through Symbolic Knowledge Distillation
We present Referee, a novel framework for sentence summarization that can be trained reference-free (i.e., requiring no gold summaries for supervision), while allowing direct control for compression ratio. Our work is the first to demonstrate that reference-free, controlled sentence summarization is feasible via the conceptual framework of Symbolic Knowledge Distillation (West et al., 2022), where latent knowledge in pre-trained language models is distilled via explicit examples sampled from the teacher models, further purified with three types of filters: length, fidelity, and Information Bottleneck. Moreover, we uniquely propose iterative distillation of knowledge, where student models from the previous iteration of distillation serve as teacher models in the next iteration. Starting off from a relatively modest set of GPT3-generated summaries, we demonstrate how iterative knowledge distillation can lead to considerably smaller, but better summarizers with sharper controllability. A useful by-product of this iterative distillation process is a high-quality dataset of sentence-summary pairs with varying degrees of compression ratios. Empirical results demonstrate that the final student models vastly outperform the much larger GPT3-Instruct model in terms of the controllability of compression ratios, without compromising the quality of resulting summarization.
['Yejin Choi', 'Yulia Tsvetkov', 'Sachin Kumar', 'Peter West', 'Melanie Sclar']
2022-10-25
null
null
null
null
['abstractive-sentence-summarization']
['natural-language-processing']
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[12.367201805114746, 9.379453659057617]
6c7d6069-8cff-4614-ab7d-e0393d9f8b30
sample-factory-egocentric-3d-control-from
2006.11751
null
https://arxiv.org/abs/2006.11751v2
https://arxiv.org/pdf/2006.11751v2.pdf
Sample Factory: Egocentric 3D Control from Pixels at 100000 FPS with Asynchronous Reinforcement Learning
Increasing the scale of reinforcement learning experiments has allowed researchers to achieve unprecedented results in both training sophisticated agents for video games, and in sim-to-real transfer for robotics. Typically such experiments rely on large distributed systems and require expensive hardware setups, limiting wider access to this exciting area of research. In this work we aim to solve this problem by optimizing the efficiency and resource utilization of reinforcement learning algorithms instead of relying on distributed computation. We present the "Sample Factory", a high-throughput training system optimized for a single-machine setting. Our architecture combines a highly efficient, asynchronous, GPU-based sampler with off-policy correction techniques, allowing us to achieve throughput higher than $10^5$ environment frames/second on non-trivial control problems in 3D without sacrificing sample efficiency. We extend Sample Factory to support self-play and population-based training and apply these techniques to train highly capable agents for a multiplayer first-person shooter game. The source code is available at https://github.com/alex-petrenko/sample-factory
['Gaurav Sukhatme', 'Vladlen Koltun', 'Tushar Kumar', 'Zhehui Huang', 'Aleksei Petrenko']
2020-06-21
null
https://proceedings.icml.cc/static/paper_files/icml/2020/3314-Paper.pdf
https://proceedings.icml.cc/static/paper_files/icml/2020/3314-Paper.pdf
icml-2020-1
['fps-games']
['playing-games']
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[3.9664306640625, 1.4691931009292603]
ff79313b-49eb-4280-bda5-2a0c509f9d7f
edge-based-tensor-prediction-via-graph-neural
2201.05770
null
https://arxiv.org/abs/2201.05770v1
https://arxiv.org/pdf/2201.05770v1.pdf
Edge-based Tensor prediction via graph neural networks
Message-passing neural networks (MPNN) have shown extremely high efficiency and accuracy in predicting the physical properties of molecules and crystals, and are expected to become the next-generation material simulation tool after the density functional theory (DFT). However, there is currently a lack of a general MPNN framework for directly predicting the tensor properties of the crystals. In this work, a general framework for the prediction of tensor properties was proposed: the tensor property of a crystal can be decomposed into the average of the tensor contributions of all the atoms in the crystal, and the tensor contribution of each atom can be expanded as the sum of the tensor projections in the directions of the edges connecting the atoms. On this basis, the edge-based expansions of force vectors, Born effective charges (BECs), dielectric (DL) and piezoelectric (PZ) tensors were proposed. These expansions are rotationally equivariant, while the coefficients in these tensor expansions are rotationally invariant scalars which are similar to physical quantities such as formation energy and band gap. The advantage of this tensor prediction framework is that it does not require the network itself to be equivariant. Therefore, in this work, we directly designed the edge-based tensor prediction graph neural network (ETGNN) model on the basis of the invariant graph neural network to predict tensors. The validity and high precision of this tensor prediction framework were shown by the tests of ETGNN on the extended systems, random perturbed structures and JARVIS-DFT datasets. This tensor prediction framework is general for nearly all the GNNs and can achieve higher accuracy with more advanced GNNs in the future.
['Hongjun Xiang', 'Xingao Gong', 'Hongyu Yu', 'Yang Zhong']
2022-01-15
null
null
null
null
['formation-energy']
['miscellaneous']
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[5.543237686157227, 5.36561918258667]
7f914d35-5864-4712-be53-c78d04b11b55
190409380
1904.09380
null
http://arxiv.org/abs/1904.09380v1
http://arxiv.org/pdf/1904.09380v1.pdf
Repurposing Entailment for Multi-Hop Question Answering Tasks
Question Answering (QA) naturally reduces to an entailment problem, namely, verifying whether some text entails the answer to a question. However, for multi-hop QA tasks, which require reasoning with multiple sentences, it remains unclear how best to utilize entailment models pre-trained on large scale datasets such as SNLI, which are based on sentence pairs. We introduce Multee, a general architecture that can effectively use entailment models for multi-hop QA tasks. Multee uses (i) a local module that helps locate important sentences, thereby avoiding distracting information, and (ii) a global module that aggregates information by effectively incorporating importance weights. Importantly, we show that both modules can use entailment functions pre-trained on a large scale NLI datasets. We evaluate performance on MultiRC and OpenBookQA, two multihop QA datasets. When using an entailment function pre-trained on NLI datasets, Multee outperforms QA models trained only on the target QA datasets and the OpenAI transformer models. The code is available at https://github.com/StonyBrookNLP/multee.
['Ashish Sabharwal', 'Tushar Khot', 'Niranjan Balasubramanian', 'Heeyoung Kwon', 'Harsh Trivedi']
2019-04-20
repurposing-entailment-for-multi-hop-question
https://aclanthology.org/N19-1302
https://aclanthology.org/N19-1302.pdf
naacl-2019-6
['multi-hop-question-answering']
['knowledge-base']
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[11.136187553405762, 7.943655967712402]
c909bec6-ec1d-4ad9-b45c-fdb9ff3786d0
classification-based-financial-markets
1603.08604
null
http://arxiv.org/abs/1603.08604v2
http://arxiv.org/pdf/1603.08604v2.pdf
Classification-based Financial Markets Prediction using Deep Neural Networks
Deep neural networks (DNNs) are powerful types of artificial neural networks (ANNs) that use several hidden layers. They have recently gained considerable attention in the speech transcription and image recognition community (Krizhevsky et al., 2012) for their superior predictive properties including robustness to overfitting. However their application to algorithmic trading has not been previously researched, partly because of their computational complexity. This paper describes the application of DNNs to predicting financial market movement directions. In particular we describe the configuration and training approach and then demonstrate their application to backtesting a simple trading strategy over 43 different Commodity and FX future mid-prices at 5-minute intervals. All results in this paper are generated using a C++ implementation on the Intel Xeon Phi co-processor which is 11.4x faster than the serial version and a Python strategy backtesting environment both of which are available as open source code written by the authors.
['Matthew Dixon', 'Diego Klabjan', 'Jin Hoon Bang']
2016-03-29
null
null
null
null
['algorithmic-trading']
['time-series']
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[4.451401710510254, 4.189846038818359]
354e8f07-1114-46e6-9c1f-f42ec701a2e1
the-mucow-word-sense-disambiguation-test
null
null
https://aclanthology.org/2020.wmt-1.40
https://aclanthology.org/2020.wmt-1.40.pdf
The MUCOW word sense disambiguation test suite at WMT 2020
This paper reports on our participation with the MUCOW test suite at the WMT 2020 news translation task. We introduced MUCOW at WMT 2019 to measure the ability of MT systems to perform word sense disambiguation (WSD), i.e., to translate an ambiguous word with its correct sense. MUCOW is created automatically using existing resources, and the evaluation process is also entirely automated. We evaluate all participating systems of the language pairs English -> Czech, English -> German, and English -> Russian and compare the results with those obtained at WMT 2019. While current NMT systems are fairly good at handling ambiguous source words, we could not identify any substantial progress - at least to the extent that it is measurable by the MUCOW method - in that area over the last year.
['Jörg Tiedemann', 'Alessandro Raganato', 'Yves Scherrer']
null
null
null
null
wmt-emnlp-2020-11
['word-sense-disambiguation']
['natural-language-processing']
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[11.44973087310791, 10.256850242614746]
3213f0ab-4ad6-4bdc-956a-56cdf3aa283c
mobilevos-real-time-video-object-segmentation
2303.07815
null
https://arxiv.org/abs/2303.07815v1
https://arxiv.org/pdf/2303.07815v1.pdf
MobileVOS: Real-Time Video Object Segmentation Contrastive Learning meets Knowledge Distillation
This paper tackles the problem of semi-supervised video object segmentation on resource-constrained devices, such as mobile phones. We formulate this problem as a distillation task, whereby we demonstrate that small space-time-memory networks with finite memory can achieve competitive results with state of the art, but at a fraction of the computational cost (32 milliseconds per frame on a Samsung Galaxy S22). Specifically, we provide a theoretically grounded framework that unifies knowledge distillation with supervised contrastive representation learning. These models are able to jointly benefit from both pixel-wise contrastive learning and distillation from a pre-trained teacher. We validate this loss by achieving competitive J&F to state of the art on both the standard DAVIS and YouTube benchmarks, despite running up to 5x faster, and with 32x fewer parameters.
['Albert Saa-Garriga', 'Bruno Manganelli', 'Mehmet Kerim Yucel', 'Roy Miles']
2023-03-14
null
http://openaccess.thecvf.com//content/CVPR2023/html/Miles_MobileVOS_Real-Time_Video_Object_Segmentation_Contrastive_Learning_Meets_Knowledge_Distillation_CVPR_2023_paper.html
http://openaccess.thecvf.com//content/CVPR2023/papers/Miles_MobileVOS_Real-Time_Video_Object_Segmentation_Contrastive_Learning_Meets_Knowledge_Distillation_CVPR_2023_paper.pdf
cvpr-2023-1
['semi-supervised-video-object-segmentation', 'video-object-segmentation', 'video-semantic-segmentation']
['computer-vision', 'computer-vision', 'computer-vision']
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[9.210428237915039, 0.023442238569259644]
3cd88e20-33b3-449d-84da-57f0c0775b3f
a-two-sub-problem-decomposition-for-the
2101.01022
null
https://arxiv.org/abs/2101.01022v1
https://arxiv.org/pdf/2101.01022v1.pdf
A Two Sub-problem Decomposition for the Optimal Design of Filterless Optical Networks
Filterless optical transport networks relies on passive optical interconnections between nodes, i.e., on splitters/couplers and amplifiers. While different studies have investigated their design, none of them offer a solution for an optimal design. We propose a one step solution scheme, which combines network provisioning, i.e., routing and wavelength assignment within a single mathematical model. Decomposition into two different types sub-problems is then used in order to conceive an exact solution scheme. The first type of subproblem relies on the generation of filterless subnetworks while the second one takes care of their wavelength assignment. Numerical experiments demonstrate the improved performance of the proposed optimization model and algorithm over the state of the art, with the improvement of the solution for several open source data sets.
['Yan Wang', 'Brigitte Jaumard']
2021-01-04
null
null
null
null
['problem-decomposition']
['miscellaneous']
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