cs231n_2019_lecture02.pdfAdministrative: Friday Di

文件名称: cs231n_2019_lecture02.pdf

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详细说明：Administrative: Friday Discussion Sections (Some) Fridays 12:30pm - 1:20pm in Gates B03 Hands-on tutorials, with more practical detail than main lecture We may not have discussion sections every Friday, check syllabus: http://cs231n.stanford.edu/syllabus.html This Friday: Python / numpy / Google CloAdministrative: Assignment 1 Out yesterday, due 4/1711: 59pm K-Nearest Neighbor Linear classifiers SVM. Softmax TWo-layer neural network Image features Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2-3 Apri14,2019 Administrative: Friday discussion Sections (Some) Fridays 12: 30pm-1: 20pm in Gates B03 Hands-on tutorials, with more practical detail than main lecture We may not have discussion sections every Friday, check syllabus http://cs231n.stanford.edu/syllabus.html This Friday: Python /numpy Google Cloud setup Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2-4 Apri14,2019 Administrative: Course Project Project proposal due 4/24 Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2- 5 Apri4,2019 Administrative: Python Numpy CS231n Convolutional Neural Networks for Visual Recognition Python Numpy tutorial This tutorial was contributed by Justin Johnson We will use the Python programming language for all assignments in this course. Python is a great general- purpose programming language on its own but with the help of a few popular libraries(numpy, scipy, matplot lib ) it becomes a powerful environment for scientific computing We expect that many of you will have some experience with Python and numpy; for the rest of you, this section will serve as a quick crash course both on the Python programming language and on the use of Python for scientific computing http:/cs231n.github.io/python-numpy-tutorial/ Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2-6 Apri14,2019 Administrative: Google Cloud We will be using Google Cloud in this class We will be distributing coupons coupons to all enrolled students See our tutorial here for walking through Google Cloud setup https://github.com/cs231n/gcloud Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2- 7 Apri14,2019 Image classification: a core task in Computer vision (assume given set of discrete labels) idog, cat, truck, plane cat This image by Nikita is licensed under CC-BY 2.0 Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2-8 Apri14,2019 The Problem: Semantic Gap [[151121081111049910699961因3112119104979387] [91981821861847998103991851231361181859485] [9981819312913112719995981299969318194] 186916164699188851011871899875849695] [114108 54648711212998748491 [13313714718365818865525474841029385B2] [12813714414010995867062656363607386101] [125133148137119121117946579886554647298 [12712513114713312712613111196897561647284] [1151141991231591481311181131891099274657278 【8993909710814713111811311411310910695778] 77868177 512513011587] 62658289787180181124126119101107114131119] 63657588897162811201381351058198110118 187186956945761381261879294185112] [1189782861171231166641519593899519217] 1515615212023641212.975958291 [13Q128134161139181091181211341148765536986] 128112961171581441281151641871829387817279] [12212118280B28694117145148153182587892167] [1221641481037156788393103119139102616984]] What the computer sees An image is just a big grid of numbers between [0, 255] eg.800×600X3 This image by Nikita is (3 channels RGB) licensed under CC-BY 2.0 Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2-9 Apri4,2019 Challenges Viewpoint variation 105112 97938 135112105 4809559 91129 日7112129 [11511418912315014813111811310910092745572 8311215314912218910475B818711299 [122164148183715578B393183119139182616984 All pixels change when the camera moves This image by Nikita licensed under CC-BY 2.0 Fei-Fei Li& Justin Johnson Serena Yeung Lecture 2-10 Apri14,2019

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