{"id":1265,"date":"2024-02-23T19:31:41","date_gmt":"2024-02-23T19:31:41","guid":{"rendered":"https:\/\/prlalmeida.com.br\/dsbd\/?page_id=1265"},"modified":"2024-11-27T00:55:40","modified_gmt":"2024-11-27T00:55:40","slug":"concept-drifts-2","status":"publish","type":"page","link":"https:\/\/prlalmeida.com.br\/dsbd\/pt\/concept-drifts-2\/","title":{"rendered":"Concept Drifts"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"1265\" class=\"elementor elementor-1265\">\n\t\t\t\t<div class=\"elementor-element elementor-element-989a78d e-flex e-con-boxed e-con e-parent\" data-id=\"989a78d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5e6d569 elementor-widget elementor-widget-heading\" data-id=\"5e6d569\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Concept Drifts <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-db71cc1 e-flex e-con-boxed e-con e-parent\" data-id=\"db71cc1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3694153 elementor-widget elementor-widget-text-editor\" data-id=\"3694153\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Em ambientes n\u00e3o estacion\u00e1rios, os modelos de aprendizado de m\u00e1quina devem ser constantemente atualizados, e as mudan\u00e7as devem ser detectadas para tornar os modelos compat\u00edveis com as condi\u00e7\u00f5es atuais do ambiente. Essas mudan\u00e7as que for\u00e7am as atualiza\u00e7\u00f5es do modelo s\u00e3o conhecidas como Mudan\u00e7as de Conceito. Um modelo que n\u00e3o consegue lidar com tais mudan\u00e7as ter\u00e1 seu desempenho degradado ao longo do tempo.<\/p><p>Por exemplo, um modelo deve ser constantemente atualizado ao lidar com detec\u00e7\u00e3o de fraudes, j\u00e1 que os atacantes est\u00e3o constantemente criando novas abordagens fraudulentas.<\/p><p>Nesses cen\u00e1rios, tanto as atualiza\u00e7\u00f5es quanto as previs\u00f5es do modelo devem ser feitas em tempo real devido \u00e0s restri\u00e7\u00f5es de tempo e \u00e0 r\u00e1pida chegada de amostras.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-18ace9b e-flex e-con-boxed e-con e-parent\" data-id=\"18ace9b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f4e9876 elementor-widget elementor-widget-heading\" data-id=\"f4e9876\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\nResultados Atuais\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cad56d1 e-flex e-con-boxed e-con e-parent\" data-id=\"cad56d1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-261b808 elementor-widget elementor-widget-heading\" data-id=\"261b808\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">O Framework Dynse<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e804c56 e-flex e-con-boxed e-con e-parent\" data-id=\"e804c56\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-45dde06 elementor-widget elementor-widget-text-editor\" data-id=\"45dde06\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>O Framework Dynse \u00e9 capaz de adaptar m\u00e9todos de sele\u00e7\u00e3o din\u00e2mica para lidar com ambientes n\u00e3o estacion\u00e1rios contendo mudan\u00e7as de conceito. Ele alcan\u00e7a resultados de ponta em benchmarks conhecidos e est\u00e1 publicamente dispon\u00edvel em https:\/\/github.com\/paulorla\/dynse<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-11a00ff e-flex e-con-boxed e-con e-parent\" data-id=\"11a00ff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f8d154c elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"f8d154c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"818\" height=\"679\" src=\"https:\/\/prlalmeida.com.br\/dsbd\/wp-content\/uploads\/2024\/02\/Screenshot-2023-12-21-162603.png\" class=\"attachment-large size-large wp-image-1136\" alt=\"\" srcset=\"https:\/\/prlalmeida.com.br\/dsbd\/wp-content\/uploads\/2024\/02\/Screenshot-2023-12-21-162603.png 818w, https:\/\/prlalmeida.com.br\/dsbd\/wp-content\/uploads\/2024\/02\/Screenshot-2023-12-21-162603-300x249.png 300w, https:\/\/prlalmeida.com.br\/dsbd\/wp-content\/uploads\/2024\/02\/Screenshot-2023-12-21-162603-768x637.png 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5bad938 e-flex e-con-boxed e-con e-parent\" data-id=\"5bad938\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9eefb75 elementor-widget elementor-widget-heading\" data-id=\"9eefb75\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Publica\u00e7\u00f5es sobre o Dynse<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-58047f8 e-flex e-con-boxed e-con e-parent\" data-id=\"58047f8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0fc5d61 elementor-widget elementor-widget-text-editor\" data-id=\"0fc5d61\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a class=\"projects-title\" style=\"text-decoration: none;\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0957417418301611\">Almeida et Al. Adapting Dynamic Classifier Selection for Concept Drift. 2018.<\/a><\/p>\n\n<a class=\"projects-title\" style=\"text-decoration: none;\" href=\"https:\/\/ieeexplore.ieee.org\/abstract\/document\/7814713\">Almeida et Al. Handling Concept Drifts Using Dynamic Selection of Classifiers. 2016<\/a>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e86264e elementor-widget elementor-widget-text-editor\" data-id=\"e86264e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<a class=\"projects-title\" style=\"text-decoration: none;\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0957417418301611\">Barboza et al. Distance Functions and Normalization Under Stream Scenarios.<\/a>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-37b0549 e-flex e-con-boxed e-con e-parent\" data-id=\"37b0549\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-fff80d0 elementor-widget elementor-widget-heading\" data-id=\"fff80d0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Fun\u00e7\u00e3o de Dist\u00e2ncia e Normaliza\u00e7\u00e3o em Cen\u00e1rios de Fluxo<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-bee8c8e e-flex e-con-boxed e-con e-parent\" data-id=\"bee8c8e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-80a0770 elementor-widget elementor-widget-text-editor\" data-id=\"80a0770\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Medir a dist\u00e2ncia quando n\u00e3o \u00e9 poss\u00edvel a normaliza\u00e7\u00e3o \u00e9 um desafio, pois n\u00e3o conhecemos exatamente o intervalo do espa\u00e7o de caracter\u00edsticas. Para fluxos de dados, se normalizarmos os dados, devemos considerar estrat\u00e9gias que possam ser replicadas em ambientes reais, como usar as estat\u00edsticas de um lote recente ou usar uma amostra do conjunto de dados. Al\u00e9m disso, talvez a normaliza\u00e7\u00e3o n\u00e3o seja obrigat\u00f3ria para fluxos de dados. Dar informa\u00e7\u00f5es aos nossos modelos de aprendizado de m\u00e1quina das quais n\u00e3o temos certeza &#8211; ou seja, o intervalo dos dados &#8211; n\u00e3o \u00e9 a melhor abordagem.<\/p>\n<p>Um exemplo \u00e9 a temperatura, que varia muito ao longo do ano. Usar as estat\u00edsticas do ver\u00e3o para normalizar os dados do inverno n\u00e3o \u00e9 v\u00e1lido. No artigo &#8220;Fun\u00e7\u00e3o de Dist\u00e2ncia e Normaliza\u00e7\u00e3o em Cen\u00e1rios de Fluxo&#8221;, conclu\u00edmos que a n\u00e3o normaliza\u00e7\u00e3o dos dados \u00e9 uma boa estrat\u00e9gia em fluxos com mudan\u00e7as de conceito.<\/p>\n<p>Conclu\u00edmos tamb\u00e9m que as fun\u00e7\u00f5es de dist\u00e2ncia de Canberra e Manhattan foram as que tiveram melhor desempenho quando o intervalo das caracter\u00edsticas variava com o tempo.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e91716e e-flex e-con-boxed e-con e-parent\" data-id=\"e91716e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-19f7e83 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"19f7e83\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"655\" height=\"421\" src=\"https:\/\/prlalmeida.com.br\/dsbd\/wp-content\/uploads\/2024\/02\/Screenshot-2023-12-21-162641.png\" class=\"attachment-large size-large wp-image-1144\" alt=\"\" srcset=\"https:\/\/prlalmeida.com.br\/dsbd\/wp-content\/uploads\/2024\/02\/Screenshot-2023-12-21-162641.png 655w, https:\/\/prlalmeida.com.br\/dsbd\/wp-content\/uploads\/2024\/02\/Screenshot-2023-12-21-162641-300x193.png 300w\" sizes=\"(max-width: 655px) 100vw, 655px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-29170af e-flex e-con-boxed e-con e-parent\" data-id=\"29170af\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Concept Drifts Em ambientes n\u00e3o estacion\u00e1rios, os modelos de aprendizado de m\u00e1quina devem ser constantemente atualizados, e as mudan\u00e7as devem [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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