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Paper Abstract and Keywords
Presentation 2022-12-22 15:30
[Short Paper] Semi supervised image classification using unreliable pseudo label
Jihong Hu, Yinhao Li, Yen-Wei Chen (Ritsumeikan Univ.) IBISML2022-47
Abstract (in Japanese) (See Japanese page) 
(in English) Semi-supervised learning (SSL), which automatically annotates unlabeled data with pseudo labels during training, has achieved great success on the image classification task. However, the training process suffers from confirmation bias due to the low quality pseudo labels. To alleviate the confirmation bias, existing SSL methods use a high confidence threshold to select the data with reliable pseudo labels and ignore the data with unreliable pseudo labels for training. Thus, many training samples with unreliable pseudo labels cannot be fully used, especially the hard samples in complex datasets, causing low model performance and slow convergence speed. To address this issue, we introduce a novel pseudo label-based SSL approach with contrastive learning, which treats the samples with unreliable pseudo labels as the negative samples of the certain categories during training. Consequently, these samples with unreliable pseudo labels could be used effectively during training process especially in the early stage. In addition, we design a selection strategy based on the distribution of model prediction results to separate reliable and unreliable pseudo labels. The experiment results on CIFAR100 dataset demonstrate the effectiveness of the proposed method.
Keyword (in Japanese) (See Japanese page) 
(in English) Semi supervised learning / contrastive learning / pseudo label / image classification / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 325, IBISML2022-47, pp. 24-29, Dec. 2022.
Paper # IBISML2022-47 
Date of Issue 2022-12-15 (IBISML) 
ISSN Online edition: ISSN 2432-6380
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All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee IBISML  
Conference Date 2022-12-22 - 2022-12-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Machine Learning, etc. 
Paper Information
Registration To IBISML 
Conference Code 2022-12-IBISML 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Semi supervised image classification using unreliable pseudo label 
Sub Title (in English)  
Keyword(1) Semi supervised learning  
Keyword(2) contrastive learning  
Keyword(3) pseudo label  
Keyword(4) image classification  
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1st Author's Name Jihong Hu  
1st Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
2nd Author's Name Yinhao Li  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
3rd Author's Name Yen-Wei Chen  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
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Speaker Author-1 
Date Time 2022-12-22 15:30:00 
Presentation Time 15 minutes 
Registration for IBISML 
Paper # IBISML2022-47 
Volume (vol) vol.122 
Number (no) no.325 
Page pp.24-29 
#Pages
Date of Issue 2022-12-15 (IBISML) 


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