Different triplet sampling techniques for lossless triplet loss on metric similarity learning

2021 ◽  
Author(s):  
Gabor Kertesz
Keyword(s):  
Sampling Techniques ◽  
Similarity Learning ◽  
Triplet Loss

scholarly journals Palm Vein Identification Based on Vein Segmentation and Triplet Loss Function

2021 ◽  
Author(s):  
Denis Trofimov ◽  
Elena Pavelyeva
Keyword(s):  
Neural Network ◽  
Loss Function ◽  
Classification Problem ◽  
Similarity Learning ◽  
The Neural Network ◽  
Segmented Images ◽  
Neural Network Algorithm ◽  
Triplet Loss ◽  
Vein Recognition ◽  
Palm Vein

In this article the new neural network algorithm for palm vein identification using the triplet loss function is proposed. The neural network model is based on the VGG16 architecture. The similarity learning problem instead of the classification problem is considered. The number of image classes is assumed to be unknown so at the output of the neural network the feature vector is obtained, and then for the pair of palm vein images the distance between them is calculated. Minimization of triplet loss function while training leads to the decrease in distances between the images of the same class, while the distances between the images of different classes increase. The neural network was trained using preprocessed and segmented images from CASIA multi-spectral palmprint image database. The use of segmentation information for palm vein recognition improves the recognition results. Experimental results demonstrate the effectiveness of the proposed method. The value of EER=0.0084 is obtained.

Handling Imbalanced Data for Real-Time Crash Prediction: Application of Boosting and Sampling Techniques

2021 ◽  
Vol 147 (3) ◽  
pp. 04020165
Author(s):  
Amin Ariannezhad ◽  
Abolfazl Karimpour ◽  
Xiao Qin ◽  
Yao-Jan Wu ◽  
Yasamin Salmani
Keyword(s):  
Real Time ◽  
Imbalanced Data ◽  
Sampling Techniques ◽  
Crash Prediction

Penerapan Psikologi Islam dalam Praktek Profesi Psikolog Muslim

2020 ◽  
Vol 3 (1) ◽  
pp. 47-60
Author(s):  
Yulia Hairina ◽  
Mubarak Mubarak
Keyword(s):  
Discussion Group ◽  
Qualitative Approach ◽  
Psychological Services ◽  
Reference Source ◽  
Sampling Techniques ◽  
Purposive Sampling ◽  
Primary Reference ◽  
Islamic Psychology

This research aims to describe the application of Islamic Psychology in the practice of Muslim psychologists and the obstacles in its application. This study uses a qualitative approach for taking respondents using purposive sampling techniques. There are twenty respondents in this study. The method used in collecting data from this study is the interview and Focus Discussion Group. This study found that the understanding of Islamic Psychology was quite diverse, but in essence, an approach that used the Qur'an and Hadist was the primary reference source. Its application, including the psychological services, and the process of counseling and therapy were carried out by integrating psychology and Islam. The cases also handled varied, not limited to severe or mild cases. The challenges were related to the ability of the psychologists and the acceptance of the clients.

Illegal rattan extraction trends in the Ankasa Conservation Area in Ghana

2018 ◽  
Vol 2 (3) ◽  
pp. 84-92
Author(s):  
R. Obour, D. Amankwaa, A. Asare
Keyword(s):  
Protected Areas ◽  
Biological Diversity ◽  
Forest Products ◽  
Simple Random Sampling ◽  
Sampling Techniques ◽  
Snowball Sampling ◽  
Conservation Area ◽  
Forest Reserve ◽  
The North ◽  
Non Timber Forest Products

Protected Areas (PAs) are created for the protection and maintenance of biological diversity, but many of Ghana’s PAs are subjectto severe pressures and threats, the main pressures being the illegal extraction of natural resources. Rattans are indisputablyone of the most important Non-Timber Forest Products (NTFPs) in Ghana’s Protected Areas that is without doubt one of thereasons for which it has drawn the attention of researchers. In this study the illegal rattan extraction patterns in the AnkasaConservation Area (ACA) in Ghana was inspected. Simple random sampling and Snowball sampling techniques were used. Datacollection employed the use of semi-structured questionnaires, interviews and field enumeration of rattans as well as an analysisof Effective Patrol Man-days (EPMDS) from 2004 to 2012. The results showed a significant positive correlation (r = 0.75, p<0.05, r2 = 0.557) between patrol effort and rattan extraction encounters. In addition, there was a general reduction in illegalrattan extraction encounters from 2004 to 2012 at a rate of 4.3 per year. The highest illegal rattan extraction incidences wererecorded in 2006 (76 encounters), 2005 (35 encounters), 2008 (22 encounters), 2004 (18 encounters) and the least incidencewere recorded in both 2010 (3 encounters) and 2011 (3 encounters).The research also revealed that Eremospatha macrocarpawas the most extracted rattan species followed by Laccosperma secundiflorum. The major rattan extraction and trade routesoriginate in the northern parts and in the area east of the reserve and also south of Draw River Forest Reserve. Generally, rattanpoaching in Ankasa Conservation Area has declined, but there are still human incursions in the northern part of the reserve. Thestudy recommended an intensification of patrols in the north of the reserve. Also, enrichment planting and Agroforestry practicesof inter-cropping rattans with seasonal crops should be pursued vigorously for the local communities.

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