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Clustering-friendly Representation Learning via Instance Discrimination and Feature Decorrelation [article]

Yaling Tao, Kentaro Takagi, Kouta Nakata
2021 arXiv   pre-print
Clustering is one of the most fundamental tasks in machine learning. Recently, deep clustering has become a major trend in clustering techniques. Representation learning often plays an important role in the effectiveness of deep clustering, and thus can be a principal cause of performance degradation. In this paper, we propose a clustering-friendly representation learning method using instance discrimination and feature decorrelation. Our deep-learning-based representation learning method is
more » ... ivated by the properties of classical spectral clustering. Instance discrimination learns similarities among data and feature decorrelation removes redundant correlation among features. We utilize an instance discrimination method in which learning individual instance classes leads to learning similarity among instances. Through detailed experiments and examination, we show that the approach can be adapted to learning a latent space for clustering. We design novel softmax-formulated decorrelation constraints for learning. In evaluations of image clustering using CIFAR-10 and ImageNet-10, our method achieves accuracy of 81.5% and 95.4%, respectively. We also show that the softmax-formulated constraints are compatible with various neural networks.
arXiv:2106.00131v1 fatcat:ym2pd5e5m5avvdz6lqi67oc5z4

RDEC: Integrating Regularization into Deep Embedded Clustering for Imbalanced Datasets [article]

Yaling Tao, Kentaro Takagi, Kouta Nakata
2018 arXiv   pre-print
Takagi & K. Nakata.  ... 
arXiv:1812.02293v1 fatcat:n2ye7q25l5ef3a6g6kgu3cawny

Medical Problems at Birth and Death

Kentaro Takagi
1984 Japanese Journal of Medicine  
doi:10.2169/internalmedicine1962.23.268 fatcat:vtbmpnstv5e73n6xe3w6czq2gm


Tokuo OGAWA, Toyohiko SATOH, Kentaro TAKAGI
1967 The Japanese Journal of Physiology  
TAKAGI sleep stage and a decrease of sweat rate may even occur upon deepening of EEG sleep stage.  ...  TAKAGI ized by an overall downward trend of its rate and by loose association with EEG pattern especially in later sleep cycles.  ... 
doi:10.2170/jjphysiol.17.135 fatcat:77fptn2ohve3vci5y5vibbr6ve


Toyohiko SATOH, Tokuo OGAWA, Kentaro TAKAGI
1965 The Japanese Journal of Physiology  
SWEATING DURING DAYTIME SLEEP Toyohiko SATOH, Tokuo OGAWA AND Kentaro TAKAGI Department of Physiology, School of Medicine, Nagoya University It has long been recognized that sweating is enhanced during  ...  TAKAGI markable in the nap as in the night sleep, possibly due to its transient and unstable appearance.  ... 
doi:10.2170/jjphysiol.15.523 fatcat:3lvcex5psjd5jn2ky6bgkbx4ga


1958 The Japanese Journal of Physiology  
doi:10.2170/jjphysiol.8.21 fatcat:gihq6576lzanpkw4csnfjmugyq

Periodontal disease and collagenase

Morimasa OKASHITA, Hiroshi TAKEUCHI, Mikimasa TAKAGI, Kentaro TAKAGAKI, Masahiro TSUTSUI
1973 Japanese Journal of Oral Biology  
doi:10.2330/joralbiosci1965.15.368 fatcat:updyjzocyva4bfz3njbyn5hily


1959 The Japanese Journal of Physiology  
doi:10.2170/jjphysiol.9.1 fatcat:l47jvuijrreyhpx6cdnh3umfwm

Sensorless parameter estimation of electromagnetic transducer considering eddy currents

Toru Ikegame, Kentaro Takagi, Tsuyoshi Inoue, Ichiro Jikuya
2017 Mechatronics (Oxford)  
This paper presents a method of estimating the parameters of an electromagnetic transducer without sensors. The proposed method utilizes the measured admittance of the electromagnetic transducer, and therefore position, velocity, and/or acceleration sensors are not necessary in this framework. Novel impedance models are proposed based on the basic physical principles of electromagnetics; in particular, the effect of eddy currents has been included in these proposed models. The validity of the
more » ... oposed estimation method and models was experimentally demonstrated by comparing the parameter estimation and vibration control capabilities of the proposed models with three conventional models.
doi:10.1016/j.mechatronics.2017.06.001 fatcat:t2uwrcz4pnhshdesxuplth3mcu

Polymer Actuators and Sensors for Soft Robotics

Kentaro Takagi
2019 Journal of the Robotics Society of Japan  
.: Ionic Polymer Metal Composites (IPMCs): Takagi, N. Tomita and K.  ... 
doi:10.7210/jrsj.37.38 fatcat:lkbk3e7dc5fhphttj2z3cwu4ia

Architecture of the Mediator Head Module

Yuichiro Takagi, Tsuyoshi Imasaki, Gang Cai, Kuang-Lei Tsai, Kentaro Yamada, Imre Berger, Francisco J. Asturias
2012 Biophysical Journal  
Rho is an essential hexameric helicase responsible for terminating 20-50% of all mRNA synthesis in E. coli. We used single-molecule force spectroscopy to investigate Rho-RNA binding interactions at the Rho-utilization (rut) site of the ltR1 terminator. Our results are consistent with Rho adopting two states, one involving Rho binding to 57 5 2 nucleotides of RNA across all of its six primary binding sites, and the other binding 85 5 2 nucleotides at these primary sites as well as a secondary
more » ... e at the center of the hexamer. We supply direct evidence that Rho translocates 5 0 /3 0 by a tethered-tracking mechanism, which may influence the ability of ribosomes or other factors to regulate RNA polymerase. Our findings allow us to develop a general model of Rho binding and translocation, and establish an experimental approach that will facilitate additional studies of termination by Rho and its regulation by transcription factors.
doi:10.1016/j.bpj.2011.11.1585 fatcat:yc2eu5nvw5gononc72g43baftq

Collagenous colitis appeared after 6-year administration of lansoprazole

Koji Sawada, Mikihiro Fujiya, Kentaro Itabashi, Yasuyuki Suzuki, Koji Kubo, Toshie Nata, Nobuhiro Ueno, Yuhei Inaba, Kentaro Moriichi, Kotaro Okamoto, Katsuya Ikuta, Hiroki Tanabe (+3 others)
2009 Clinical Journal of Gastroenterology  
Collagenous colitis (CC) is one of the causes of undefined watery diarrhea, which is histologically accompanied by a thickening of the subepithelial collagen layer. CC associated with lansoprazole normally occurs within several weeks after the initial administration, but no case presenting after the long term administration of lansoprazole has yet been reported. A 77-year-old male with a history of 6-year administration of lansoprazole complained of watery diarrhea and weight loss. A
more » ... revealed the disappearance of vascular networks and red spots in the sigmoid colon. The biopsy specimen showed erosion and collagen bands thickened, so the patient was diagnosed as CC. After lansoprazole discontinuation, the watery diarrhea disappeared and histological abnormalities improved.
doi:10.1007/s12328-009-0126-4 pmid:26189901 fatcat:c6phzpntqvb4bgfakicjuronyy

Ordered Counterfactual Explanation by Mixed-Integer Linear Optimization [article]

Kentaro Kanamori, Takuya Takagi, Ken Kobayashi, Yuichi Ike, Kento Uemura, Hiroki Arimura
2021 arXiv   pre-print
Post-hoc explanation methods for machine learning models have been widely used to support decision-making. One of the popular methods is Counterfactual Explanation (CE), also known as Actionable Recourse, which provides a user with a perturbation vector of features that alters the prediction result. Given a perturbation vector, a user can interpret it as an "action" for obtaining one's desired decision result. In practice, however, showing only a perturbation vector is often insufficient for
more » ... rs to execute the action. The reason is that if there is an asymmetric interaction among features, such as causality, the total cost of the action is expected to depend on the order of changing features. Therefore, practical CE methods are required to provide an appropriate order of changing features in addition to a perturbation vector. For this purpose, we propose a new framework called Ordered Counterfactual Explanation (OrdCE). We introduce a new objective function that evaluates a pair of an action and an order based on feature interaction. To extract an optimal pair, we propose a mixed-integer linear optimization approach with our objective function. Numerical experiments on real datasets demonstrated the effectiveness of our OrdCE in comparison with unordered CE methods.
arXiv:2012.11782v2 fatcat:fhzgtx335fa6zgv66mirgd7rha

23. Spinal Ascending Tract concerned with Skin Pressure Reflex

Kentaro TAKAGI, Mitsuo KOSAKA, Toyohiko SATO, Sohei YAMAMOTO
1964 Neurologia medico-chirurgica  
Kentaro TAKAGI, Mitsuo KOSAKA, Toyohiko SATO and Sohei YAMAMOTO Department of Physiology, Nagoya University School of Medicine Mechanical pressure applied on some area of the trunk or a certain .  ... 
doi:10.2176/nmc.6.66 fatcat:e5jtihdymzberk3wrfco2xcnyi


Takanori OOKAWA, Kentaro TAKAGI
1968 The Japanese Journal of Physiology  
TAKAGI  ...  This phenomenon is, designated" Skin-Pressure-Reflex" by TAKAGI").  ... 
doi:10.2170/jjphysiol.18.87 fatcat:rvbcgmjbd5bubkx64baceyzsvy
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