Fast Few-Shot Classification by Few-Iteration Meta-Learning

2021 ◽  
Author(s):  
Ardhendu Shekhar Tripathi ◽  
Martin Danelljan ◽  
Luc Van Gool ◽  
Radu Timofte
Keyword(s):  
Shot Classification ◽  
Meta Learning

scholarly journals Meta Learning for Few-Shot One-Class Classification

AI ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 195-208
Author(s):  
Gabriel Dahia ◽  
Maurício Pamplona Segundo
Keyword(s):  
Feature Representation ◽  
Support Vector ◽  
Support Vector Data Description ◽  
Target Class ◽  
Feature Representations ◽  
Shot Classification ◽  
Training Stage ◽  
Comparable Performance ◽  
Meta Learning ◽  
One Class Classification

We propose a method that can perform one-class classification given only a small number of examples from the target class and none from the others. We formulate the learning of meaningful features for one-class classification as a meta-learning problem in which the meta-training stage repeatedly simulates one-class classification, using the classification loss of the chosen algorithm to learn a feature representation. To learn these representations, we require only multiclass data from similar tasks. We show how the Support Vector Data Description method can be used with our method, and also propose a simpler variant based on Prototypical Networks that obtains comparable performance, indicating that learning feature representations directly from data may be more important than which one-class algorithm we choose. We validate our approach by adapting few-shot classification datasets to the few-shot one-class classification scenario, obtaining similar results to the state-of-the-art of traditional one-class classification, and that improves upon that of one-class classification baselines employed in the few-shot setting.

scholarly journals Few-Shot Classification in Unseen Domains by Episodic Meta-Learning Across Visual Domains

2021 ◽  
Author(s):  
Yuan-Chia Cheng ◽  
Ci-Siang Lin ◽  
Fu-En Yang ◽  
Yu-Chiang Frank Wang
Keyword(s):  
Shot Classification ◽  
Meta Learning

scholarly journals Prototype Propagation Networks (PPN) for Weakly-supervised Few-shot Learning on Category Graph

2019 ◽  
Author(s):  
Lu Liu ◽  
Tianyi Zhou ◽  
Guodong Long ◽  
Jing Jiang ◽  
Lina Yao ◽  
...  
Keyword(s):  
Nearest Neighbor ◽  
Common Knowledge ◽  
K Nearest Neighbor ◽  
Shot Classification ◽  
Meta Learning ◽  
Machine Learning Applications ◽  
Weakly Supervised ◽  
Propagation Network ◽  
Training Objective ◽  
Weakly Labeled Data

A variety of machine learning applications expect to achieve rapid learning from a limited number of labeled data. However, the success of most current models is the result of heavy training on big data. Meta-learning addresses this problem by extracting common knowledge across different tasks that can be quickly adapted to new tasks. However, they do not fully explore weakly-supervised information, which is usually free or cheap to collect. In this paper, we show that weakly-labeled data can significantly improve the performance of meta-learning on few-shot classification. We propose prototype propagation network (PPN) trained on few-shot tasks together with data annotated by coarse-label. Given a category graph of the targeted fine-classes and some weakly-labeled coarse-classes, PPN learns an attention mechanism which propagates the prototype of one class to another on the graph, so that the K-nearest neighbor (KNN) classifier defined on the propagated prototypes results in high accuracy across different few-shot tasks. The training tasks are generated by subgraph sampling, and the training objective is obtained by accumulating the level-wise classification loss on the subgraph. On two benchmarks, PPN significantly outperforms most recent few-shot learning methods in different settings, even when they are also allowed to train on weakly-labeled data.

scholarly journals Few-shot Classification of Aerial Scene Images via Meta-learning

2020 ◽  
Author(s):  
Pei Zhang ◽  
YIng Li ◽  
Dong Wang ◽  
Yunpeng Bai
Keyword(s):  
Classification Problem ◽  
Training Data ◽  
Scene Classification ◽  
Shot Classification ◽  
Training Stage ◽  
Testing Stage ◽  
Meta Learning ◽  
Cosine Distance ◽  
Query Sample

CNN-based methods have dominated the field of aerial scene classification for the past few years. While achieving remarkable success, CNN-based methods suffer from excessive parameters and notoriously rely on large amounts of training data. In this work, we introduce few-shot learning to the aerial scene classification problem. Few-shot learning aims to learn a model on base-set that can quickly adapt to unseen categories in novel-set, using only a few labeled samples. To this end, we proposed a meta-learning method for few-shot classification of aerial scene images. First, we train a feature extractor on all base categories to learn a representation of inputs. Then in the meta-training stage, the classifier is optimized in the metric space by cosine distance with a learnable scale parameter. At last, in the meta-testing stage, the query sample in the unseen category is predicted by the adapted classifier given a few support samples. We conduct extensive experiments on two challenging datasets: NWPU-RESISC45 and RSD46-WHU. The experimental results show that our method outperforms three state-of-the-art few-shot algorithms and one typical CNN-based method, D-CNN. Furthermore, several ablation experiments are conducted to investigate the effects of dataset scale and support shots; the experiment results confirm that our model is specifically effective in few-shot settings.

scholarly journals Meta-FSEO: A Meta-Learning Fast Adaptation with Self-Supervised Embedding Optimization for Few-Shot Remote Sensing Scene Classification

2021 ◽  
Vol 13 (14) ◽  
pp. 2776
Author(s):  
Yong Li ◽  
Zhenfeng Shao ◽  
Xiao Huang ◽  
Bowen Cai ◽  
Song Peng
Keyword(s):  
Remote Sensing ◽  
Deep Learning ◽  
Remote Sensing Data ◽  
Scene Classification ◽  
Generalization Capability ◽  
Urban Scenes ◽  
Shot Classification ◽  
Meta Learning ◽  
Land Surfaces ◽  
Fast Adaptation

The performance of deep learning is heavily influenced by the size of the learning samples, whose labeling process is time consuming and laborious. Deep learning algorithms typically assume that the training and prediction data are independent and uniformly distributed, which is rarely the case given the attributes and properties of different data sources. In remote sensing images, representations of urban land surfaces can vary across regions and by season, demanding rapid generalization of these surfaces in remote sensing data. In this study, we propose Meta-FSEO, a novel model for improving the performance of few-shot remote sensing scene classification in varying urban scenes. The proposed Meta-FSEO model deploys self-supervised embedding optimization for adaptive generalization in new tasks such as classifying features in new urban regions that have never been encountered during the training phase, thus balancing the requirements for feature classification tasks between multiple images collected at different times and places. We also created a loss function by weighting the contrast losses and cross-entropy losses. The proposed Meta-FSEO demonstrates a great generalization capability in remote sensing scene classification among different cities. In a five-way one-shot classification experiment with the Sentinel-1/2 Multi-Spectral (SEN12MS) dataset, the accuracy reached 63.08%. In a five-way five-shot experiment on the same dataset, the accuracy reached 74.29%. These results indicated that the proposed Meta-FSEO model outperformed both the transfer learning-based algorithm and two popular meta-learning-based methods, i.e., MAML and Meta-SGD.

scholarly journals M-NAS: Meta Neural Architecture Search

2020 ◽  
Vol 34 (04) ◽  
pp. 6186-6193
Author(s):  
Jiaxing Wang ◽  
Jiaxiang Wu ◽  
Haoli Bai ◽  
Jian Cheng
Keyword(s):  
Gradient Descent ◽  
Experimental Results ◽  
Model Generation ◽  
Classification Problems ◽  
Shot Classification ◽  
Neural Architecture ◽  
Optimal Weights ◽  
Meta Learning ◽  
The One

Neural Architecture Search (NAS) has recently outperformed hand-crafted networks in various areas. However, most prevalent NAS methods only focus on a pre-defined task. For a previously unseen task, the architecture is either searched from scratch, which is inefficient, or transferred from the one obtained on some other task, which might be sub-optimal. In this paper, we investigate a previously unexplored problem: whether a universal NAS method exists, such that task-aware architectures can be effectively generated? Towards this problem, we propose Meta Neural Architecture Search (M-NAS). To obtain task-specific architectures, M-NAS adopts a task-aware architecture controller for child model generation. Since optimal weights for different tasks and architectures span diversely, we resort to meta-learning, and learn meta-weights that efficiently adapt to a new task on the corresponding architecture with only several gradient descent steps. Experimental results demonstrate the superiority of M-NAS against a number of competitive baselines on both toy regression and few shot classification problems.

scholarly journals A Dual Attention Network with Semantic Embedding for Few-Shot Learning

2019 ◽  
Vol 33 ◽  
pp. 9079-9086 ◽  
Author(s):  
Shipeng Yan ◽  
Songyang Zhang ◽  
Xuming He
Keyword(s):  
Complex Model ◽  
Training Data ◽  
Future Research ◽  
Learning Approaches ◽  
Learning Loss ◽  
Attention Network ◽  
Shot Classification ◽  
Recent Success ◽  
Meta Learning ◽  
Visual Concepts

Despite recent success of deep neural networks, it remains challenging to efficiently learn new visual concepts from limited training data. To address this problem, a prevailing strategy is to build a meta-learner that learns prior knowledge on learning from a small set of annotated data. However, most of existing meta-learning approaches rely on a global representation of images and a meta-learner with complex model structures, which are sensitive to background clutter and difficult to interpret. We propose a novel meta-learning method for few-shot classification based on two simple attention mechanisms: one is a spatial attention to localize relevant object regions and the other is a task attention to select similar training data for label prediction. We implement our method via a dual-attention network and design a semantic-aware meta-learning loss to train the meta-learner network in an end-to-end manner. We validate our model on three few-shot image classification datasets with extensive ablative study, and our approach shows competitive performances over these datasets with fewer parameters. For facilitating the future research, code and data split are available: https://github.com/tonysy/STANet-PyTorch

Meta-Learning based prototype-relation network for few-shot classification

2020 ◽  
Vol 383 ◽  
pp. 224-234 ◽  
Author(s):  
Xiaoqian Liu ◽  
Fengyu Zhou ◽  
Jin Liu ◽  
Lianjie Jiang
Keyword(s):  
Shot Classification ◽  
Meta Learning
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