{"id":6227,"date":"2025-03-21T11:17:10","date_gmt":"2025-03-21T14:17:10","guid":{"rendered":"https:\/\/geekblogti.wpengine.com\/?p=6227"},"modified":"2025-03-27T10:47:54","modified_gmt":"2025-03-27T13:47:54","slug":"aprendizagem-de-maquina-supervisionada-ou-nao-supervisionada","status":"publish","type":"post","link":"https:\/\/www.geekhunter.com/pt/blog\/aprendizagem-de-maquina-supervisionada-ou-nao-supervisionada\/","title":{"rendered":"Diferen\u00e7as entre as abordagens de Aprendizagem de M\u00e1quina"},"content":{"rendered":"\r\n<p class=\"wp-block-paragraph\">Cada vez mais somos apresentados a casos de sucesso envolvendo a implementa\u00e7\u00e3o de algoritmos de <strong>aprendizagem de m\u00e1quina <\/strong>(<a href=\"https:\/\/geekblogti.wpengine.com\/machine-learning-em-vez-de-combater-que-tal-tirar-o-maximo-de-proveito\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"machine learning (abre numa nova aba)\"><strong>machine learning<\/strong><\/a>) como <strong>Facebook, Netflix, Ifood<\/strong>, entre outros.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Dessa forma, voc\u00ea decide trazer essa \u2018<em>boa nova<\/em>\u2019 aos seus neg\u00f3cios para acelerar suas vendas, ou criar campanhas de marketing mais atraentes e com isso obter um maior engajamento do p\u00fablico.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Por\u00e9m, ao pesquisar, voc\u00ea se depara com dois tipos de algoritmos de <strong>aprendizagem de m\u00e1quina, <\/strong>que s\u00e3o:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><em>Aprendizado de m\u00e1quina supervisionado<\/em><\/li>\r\n<li><em>Aprendizagem de m\u00e1quina n\u00e3o supervisionado<\/em><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">E agora, qual usar? Uso os dois, ou nenhum? Ser\u00e1 que existe algum deles que \u00e9 melhor que o outro? Acredite, essas perguntas e esses estranhamentos s\u00e3o mais comuns do que parece.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Digo isso por experi\u00eancia pr\u00f3pria. Quando comecei a <strong><a href=\"https:\/\/www.alura.com.br\/formacao-machine-learning\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\" (abre numa nova aba)\">estudar aprendizagem de m\u00e1quina<\/a><\/strong>, eu tinha essas d\u00favidas e algumas dificuldade no que diz respeito \u00e0 implementa\u00e7\u00e3o.<\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Exemplo pr\u00e1tico de machine learning<\/h2>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image\"><img fetchpriority=\"high\" decoding=\"async\" width=\"960\" height=\"637\" class=\"wp-image-6236\" src=\"https:\/\/geekblogti.wpengine.com\/wp-content\/uploads\/2019\/07\/exemplo-pratico-de-machine-learning.jpg\" alt=\"tela de um tablet com um carrinho de compras \" srcset=\"https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/exemplo-pratico-de-machine-learning.jpg 960w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/exemplo-pratico-de-machine-learning-150x100.jpg 150w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/exemplo-pratico-de-machine-learning-100x66.jpg 100w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/exemplo-pratico-de-machine-learning-600x398.jpg 600w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/exemplo-pratico-de-machine-learning-450x299.jpg 450w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/exemplo-pratico-de-machine-learning-814x540.jpg 814w\" sizes=\"(max-width: 960px) 100vw, 960px\" \/><\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Para sanar as d\u00favidas sobre aprendizagem de m\u00e1quina supervisionada e n\u00e3o supervisionada eu\u00a0trouxe um exemplo que venho me debru\u00e7ando h\u00e1 algum tempo: o uso de <strong>aprendizagem de m\u00e1quina<\/strong> em com\u00e9rcio de roupas.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Para o nosso estudo eu trouxe um conjunto de dados (nesse caso aned\u00f3tico) para exemplificar ilustrar os exemplos.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">O exemplo que utilizaremos \u00e9 o seguinte: Um <em>e-commerce<\/em> de roupas decidiu utilizar aprendizado de m\u00e1quina para criar uma campanha de <em>marketing <\/em>que seja mais atraente ao p\u00fablico em geral.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Sabe aqueles <em>e-mails<\/em> <em>marketing<\/em> que recebemos com promo\u00e7\u00f5es de uma dezena de lojas? Ent\u00e3o, muito provavelmente eles utilizam<strong><a href=\"https:\/\/geekblogti.wpengine.com\/aprendizado-de-maquina-e-seus-algoritmos\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\" (abre numa nova aba)\"> algoritmos de machine learning<\/a><\/strong> para descobrir o seu perfil de compra e selecionar os produtos que acreditam ter potencial de venda para o seu perfil de consumidor.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Aqui faremos uma breve discuss\u00e3o de como utilizar algoritmos e, para isso, temos os seguintes dados:<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>Banco de dados do cliente<\/strong>:<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>ID: <\/strong>Identifica\u00e7\u00e3o do cliente<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Idade: <\/strong>Idade do cliente<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>G\u00eanero:<\/strong> G\u00eanero do cliente que comprou a roupa, para fins did\u00e1ticos iremos considerar apenas o g\u00eanero bin\u00e1rio, ou seja, masculino ou feminino.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Data: <\/strong>Data em que o cliente efetuou a compra<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Hora: <\/strong>\u00a0Hora em que o cliente efetuou a compra<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Cal\u00e7a<\/strong>: Valor bin\u00e1rio identificando se o cliente comprou ou n\u00e3o a cal\u00e7a, sendo 1-Comprou e 0- N\u00e3o comprou<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Cal\u00e7a Id<\/strong>: C\u00f3digo do produto.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>N\u00fameros likes cal\u00e7a: <\/strong>N\u00famero de avalia\u00e7\u00f5es positivas que essa cal\u00e7a teve por outros clientes<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Avalia\u00e7\u00e3o cliente cal\u00e7a<\/strong>: Avalia\u00e7\u00e3o que o cliente deu \u00e0 pe\u00e7a de roupa indo de 1 a 5, sendo 1-p\u00e9ssimo e 5-\u00f3timo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Cal\u00e7ado:<\/strong> Valor bin\u00e1rio identificando se o cliente comprou ou n\u00e3o o cal\u00e7ado, sendo 1-Comprou e 0- N\u00e3o comprou<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Cal\u00e7ado Id<\/strong>: C\u00f3digo do produto.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>N\u00fameros likes cal\u00e7ado:<\/strong> Avalia\u00e7\u00e3o que o cliente deu ao cal\u00e7ado indo de 1 a 5, sendo 1-p\u00e9ssimo e 5-\u00f3timo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Avalia\u00e7\u00e3o cal\u00e7ado: <\/strong>N\u00famero de avalia\u00e7\u00f5es positivas que esse cal\u00e7ado teve por outros clientes<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Avalia\u00e7\u00e3o cliente cal\u00e7ado: <\/strong>\u00a0Avalia\u00e7\u00e3o que o cliente deu \u00e0 pe\u00e7a de roupa indo de 1 a 5, sendo 1-p\u00e9ssimo e 5-\u00f3timo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Camisa<\/strong>: Valor bin\u00e1rio identificando se o cliente comprou ou n\u00e3o a camisa, sendo 1-Comprou e 0- N\u00e3o comprou<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Camisa Id<\/strong>: C\u00f3digo do produto.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>N\u00fameros likes camisa: <\/strong>N\u00famero de avalia\u00e7\u00f5es positivas que essa camisa teve por outros clientes<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Avalia\u00e7\u00e3o cliente camisa: <\/strong>\u00a0Avalia\u00e7\u00e3o que o cliente deu \u00e0 pe\u00e7a de roupa, indo de 1 a 5, sendo 1-p\u00e9ssimo e 5-\u00f3timo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Vestido: <\/strong>Valor bin\u00e1rio identificando se o cliente comprou ou n\u00e3o o vestido, sendo 1-Comprou e 0- N\u00e3o comprou<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Vestido Id<\/strong>: C\u00f3digo do produto.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>N\u00fameros likes vestido:\u00a0 <\/strong>N\u00famero de avalia\u00e7\u00f5es positivas que esse vestido teve por outros clientes.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Avalia\u00e7\u00e3o cliente vestido: <\/strong>\u00a0Avalia\u00e7\u00e3o que o cliente deu \u00e0 pe\u00e7a de roupa indo de 1 a 5, sendo 1-p\u00e9ssimo e 5-\u00f3timo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Valor da compra: <\/strong>Valor gasto pelo cliente na compra.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Os campos descritos como n\u00fameros de <em>likes<\/em> indicam quantos<em> likes <\/em>a pe\u00e7a recebeu. N\u00e3o necessariamente dizem respeito a se pessoa que deu o<em> like<\/em> comprou a pe\u00e7a, na verdade o <em>like<\/em> pode simbolizar o desejo de compra.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Agora que entendemos melhor os dados que temos, partiremos para os algoritmos de <strong>aprendizagem de m\u00e1quina.<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>&gt;&gt;Leitura Recomendada:<\/strong><br \/><em>Leia nosso artigo sobre 5 <\/em><a href=\"https:\/\/geekblogti.wpengine.com\/5-ferramentas-de-big-data-para-voce-conhecer\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>ferramentas de Big Data<\/em><\/strong><\/a><em> para voc\u00ea conhecer<\/em><\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Aprendizado de m\u00e1quina supervisionado<\/h2>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"960\" height=\"638\" class=\"wp-image-6237\" src=\"https:\/\/geekblogti.wpengine.com\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-supervisionado.jpg\" alt=\"teclado de computador com buy escrito na tecla enter\" srcset=\"https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-supervisionado.jpg 960w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-supervisionado-150x100.jpg 150w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-supervisionado-100x66.jpg 100w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-supervisionado-600x399.jpg 600w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-supervisionado-450x299.jpg 450w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-supervisionado-813x540.jpg 813w\" sizes=\"(max-width: 960px) 100vw, 960px\" \/><\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ao utilizarmos a aprendizagem de m\u00e1quina supervisionada recebemos um conjunto de dados que ser\u00e3o divididos em<em> vari\u00e1veis de sa\u00edda<\/em>, ou vari\u00e1veis dependentes, e<em> vari\u00e1veis de entrada<\/em>, ou predecessoras. Nosso objetivo\u00a0\u00e9 utilizar as vari\u00e1veis de entrada para prever as vari\u00e1veis de sa\u00edda.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">E esta previs\u00e3o pode ser de duas formas:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Algoritmos de classifica\u00e7\u00e3o<\/li>\r\n<li>Algoritmos de regress\u00e3o\u00a0<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Algoritmos de classifica\u00e7\u00e3o<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Como exemplo de algoritmo de classifica\u00e7\u00e3o, utilizaremos as seguintes informa\u00e7\u00f5es do nosso banco de dados de<em> e-commerce<\/em> de roupas:<\/p>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>Vari\u00e1veis de entrada<\/strong><\/h4>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Id<\/strong><\/td>\r\n<td><strong>Idade<\/strong><\/td>\r\n<td><strong>G\u00eanero<\/strong><\/td>\r\n<td><strong>Avalia\u00e7\u00e3o cal\u00e7a<\/strong><\/td>\r\n<td><strong>Avalia\u00e7\u00e3o cliente cal\u00e7a<\/strong><\/td>\r\n<td><strong>Cal\u00e7a Id<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>1<\/td>\r\n<td>27<\/td>\r\n<td>M<\/td>\r\n<td>5<\/td>\r\n<td>NaN<\/td>\r\n<td>2135<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>2<\/td>\r\n<td>30<\/td>\r\n<td>M<\/td>\r\n<td>10<\/td>\r\n<td>3<\/td>\r\n<td>2130<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>3<\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>21<\/td>\r\n<td>5<\/td>\r\n<td>1930<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4<\/td>\r\n<td>31<\/td>\r\n<td>F<\/td>\r\n<td>17<\/td>\r\n<td>1<\/td>\r\n<td>1931<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>5<\/td>\r\n<td>18<\/td>\r\n<td>F<\/td>\r\n<td>9<\/td>\r\n<td>NaN<\/td>\r\n<td>1932<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>6<\/td>\r\n<td>40<\/td>\r\n<td>M<\/td>\r\n<td>10<\/td>\r\n<td>4<\/td>\r\n<td>2135<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>7<\/td>\r\n<td>35<\/td>\r\n<td>F<\/td>\r\n<td>13<\/td>\r\n<td>3<\/td>\r\n<td>1932<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\">Vari\u00e1veis de sa\u00edda<\/h4>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Cal\u00e7a<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>0<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>1<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>1<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>1<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>0<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>1<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>1<\/strong><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Os NaNs que temos no banco de dados dizem respeito aos clientes que n\u00e3o compraram a cal\u00e7a, ou que ainda n\u00e3o compraram, dessa forma a avalia\u00e7\u00e3o est\u00e1 indispon\u00edvel para eles.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">A abordagem que faremos \u00e9 a seguinte, classificaremos este cliente:<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Id<\/strong><\/td>\r\n<td><strong>Idade<\/strong><\/td>\r\n<td><strong>G\u00eanero<\/strong><\/td>\r\n<td><strong>Avalia\u00e7\u00e3o cal\u00e7a<\/strong><\/td>\r\n<td><strong>Avalia\u00e7\u00e3o cliente<\/strong><\/td>\r\n<td><strong>Cal\u00e7a Id<\/strong><\/td>\r\n<td><strong>cal\u00e7a<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>8<\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>25<\/td>\r\n<td>NaN<\/td>\r\n<td>1930<\/td>\r\n<td>????<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ele ser\u00e1 classificado com o valor 1 ou 0, isto \u00e9, se compraria ou n\u00e3o a cal\u00e7a. Assim, se o algoritmo avaliar que ele compraria a cal\u00e7a, podemos destinar um e-mail mostrando a cal\u00e7a. Ou, se ele estiver\u00a0logado no site, podemos exibir essa cal\u00e7a em destaque.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Esse exemplo \u00e9 interessante pois, quando um cliente vai \u00e0 loja, ele compra baseado na prova da pe\u00e7a. Ou seja, o cliente vai at\u00e9 o provador e se olha no espelho e decide ou n\u00e3o se compra a pe\u00e7a.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Por\u00e9m, em um site, o cliente n\u00e3o tem como provar a pe\u00e7a. Dessa forma ele compra baseado em outras coisas, como por exemplo:<em> feedback<\/em> positivo, avalia\u00e7\u00f5es, fotos da pe\u00e7a, entre outras coisas.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Como curiosidade o cliente de <em>id <\/em>foi classificado como compra.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">Algoritmo de regress\u00e3o<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ao utilizarmos um algoritmo de regress\u00e3o estamos, em boa parte dos casos, interessados em prever um valor num\u00e9rico. Em nosso exemplo utilizaremos o algoritmo de regress\u00e3o a fim de prever o valor de compra gasto por um determinado cliente que adicionou um item \u00e0 cesta de compra do site.<\/p>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>Vari\u00e1veis de entrada<\/strong><\/h4>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Id<\/strong><\/td>\r\n<td><strong>Idade<\/strong><\/td>\r\n<td><strong>G\u00eanero<\/strong><\/td>\r\n<td><strong>Cal\u00e7a<\/strong><\/td>\r\n<td><strong>Cal\u00e7ado<\/strong><\/td>\r\n<td><strong>Camisa<\/strong><\/td>\r\n<td><strong>Vestido<\/strong><\/td>\r\n<td><strong>Data<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>1<\/td>\r\n<td>27<\/td>\r\n<td>M<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>07\/03\/2019<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>2<\/td>\r\n<td>30<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>05\/03\/2019<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>3<\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>05\/03\/2019<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4<\/td>\r\n<td>31<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>01\/03\/2019<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>5<\/td>\r\n<td>18<\/td>\r\n<td>F<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>15\/03\/2019<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>6<\/td>\r\n<td>40<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>10\/03\/2019<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>7<\/td>\r\n<td>35<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>09\/03\/2019<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>Vari\u00e1veis de sa\u00edda<\/strong><\/h4>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Valor de compra<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>R$ 150,98<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>R$ 75,10<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>R$ 250,73<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>R$ 110,45<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>R$ 59,90<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>R$ 178,89<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>R$ 134,14<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Nossa abordagem ser\u00e1: Fazer uma regress\u00e3o para predizer quanto o seguinte cliente gastar\u00e1 naquela compra.<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td><strong>Id<\/strong><\/td>\r\n<td><strong>Idade<\/strong><\/td>\r\n<td><strong>G\u00eanero<\/strong><\/td>\r\n<td><strong>Cal\u00e7a<\/strong><\/td>\r\n<td><strong>Cal\u00e7ado<\/strong><\/td>\r\n<td><strong>Camisa<\/strong><\/td>\r\n<td><strong>Vestido<\/strong><\/td>\r\n<td><strong>Valor de compra<\/strong><\/td>\r\n<\/tr>\r\n<tr>\r\n<td><strong>8<\/strong><\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>NaN<\/td>\r\n<td>NaN<\/td>\r\n<td>NaN<\/td>\r\n<td>?????<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">O cliente de id 8 adicionou a cal\u00e7a em seu carrinho, desta forma o algoritmo far\u00e1 uma regress\u00e3o de quanto o cliente gastar\u00e1 em sua compra.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Pode parecer estranho <em>a priori<\/em> o modelo de funcionamento desse algoritmo funcionar, mas vamos analisar o seguinte: Imagine que o cliente de id 8 com a cal\u00e7a em seu carrinho gastou R$ 75,10, por\u00e9m o algoritmo de regress\u00e3o sinalizou que o cliente gastar\u00e1 R$150,00.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Isso pode nos indicar que o cliente tem pretens\u00e3o de gastar mais, por\u00e9m pode n\u00e3o ter encontrado outras pe\u00e7as que tenha gostado. Ent\u00e3o podemos utilizar o algoritmo de classifica\u00e7\u00e3o para analisar quais as pe\u00e7as de roupa o algoritmo indica como compra.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Dessa forma, antes de o cliente finalizar sua compra, podemos mandar uma mensagem com as pe\u00e7as de roupas que o algoritmo de classifica\u00e7\u00e3o sinalizou como 1 para ele.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Trouxe a integra\u00e7\u00e3o de uma algoritmo de classifica\u00e7\u00e3o e de regress\u00e3o para compreens\u00e3o dos algoritmos de <strong>aprendizagem de m\u00e1quina supervisionado<\/strong>.\u00a0 \u00a0<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><em>&gt;<strong>&gt;Leitura Recomendada:<\/strong><br \/><\/em><strong><em><a href=\"https:\/\/geekblogti.wpengine.com\/algoritmos-de-recomendacao-o-que-sao-e-como-implementa-los\/\">Algoritmos de Recomenda\u00e7\u00e3o<\/a>: <\/em><\/strong><em>O que s\u00e3o e como implementar?<\/em><\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Aprendizado de m\u00e1quina n\u00e3o supervisionado<\/h2>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"960\" height=\"540\" class=\"wp-image-6238\" src=\"https:\/\/geekblogti.wpengine.com\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado.jpg\" alt=\"robo pequeno dourado\" srcset=\"https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado.jpg 960w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado-150x84.jpg 150w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado-100x56.jpg 100w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado-600x338.jpg 600w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado-450x253.jpg 450w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado-300x169.jpg 300w, https:\/\/www.geekhunter.com/pt/blog\/wp-content\/uploads\/2019\/07\/aprendizado-de-maquina-nao-supervisionado-768x432.jpg 768w\" sizes=\"(max-width: 960px) 100vw, 960px\" \/><\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ao utilizarmos um algoritmo de aprendizagem de m\u00e1quina n\u00e3o supervisionado, n\u00e3o possu\u00edmos dados de entrada e de sa\u00edda. Dessa forma,\u00a0podemos estar interessados em:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Registros de compras:<\/strong> Associar produtos ou tra\u00e7ar perfil dos clientes<\/li>\r\n<li><strong>Transa\u00e7\u00f5es banc\u00e1rias<\/strong>: Verificar normalidade de transa\u00e7\u00f5es banc\u00e1rias<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Para o nosso exemplo vamos, atrav\u00e9s do hist\u00f3rico de compras, tra\u00e7ar o perfil de compras e com isso agrupar os clientes por perfil.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ent\u00e3o o que fazemos com esse tipo de algoritmo? Para justificar o uso desse algoritmo vamos contextualiz\u00e1-lo um pouco melhor.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Estamos utilizando um exemplo simplificado de<em> e-commerce<\/em>, mas um <em>e-commerce<\/em> de roupas real possui centenas de pe\u00e7as de roupa e cada pe\u00e7a de roupa tem centenas de modelos.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Dessa forma, quando utilizarmos nosso algoritmo de classifica\u00e7\u00e3o, teremos que testar item a item de nossa loja, isso tornaria o processo lento.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Imagine um cliente que finalize sua compra ter que esperar dois minutos ou mais para o algoritmo conseguir testar item a item quais pe\u00e7as de roupa o algoritmo de classifica\u00e7\u00e3o indica como compra.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Para evitar isso faremos\u00a0 o seguinte: Utilizamos o <strong>algoritmo de m\u00e1quina n\u00e3o supervisionado <\/strong>para agrupar os clientes de acordo com seu perfil de compras.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Dessa forma, quando um novo cliente entrar no site, podemos coloc\u00e1-lo em um dos grupos e assim, ao inv\u00e9s de testarmos todos os itens da loja, testamos apenas os itens que est\u00e3o naquele grupo de clientes.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\"><strong>Vari\u00e1veis que utilizaremos em nosso exemplo<\/strong>:<\/h3>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td>Id<\/td>\r\n<td>Idade<\/td>\r\n<td>G\u00eanero<\/td>\r\n<td>Cal\u00e7a<\/td>\r\n<td>Cal\u00e7ado<\/td>\r\n<td>Camisa<\/td>\r\n<td>Camisa<\/td>\r\n<td>Vestido<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>1<\/td>\r\n<td>27<\/td>\r\n<td>M<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>2<\/td>\r\n<td>30<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>3<\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4<\/td>\r\n<td>31<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>5<\/td>\r\n<td>18<\/td>\r\n<td>F<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>6<\/td>\r\n<td>40<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>7<\/td>\r\n<td>35<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>8<\/td>\r\n<td>24<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>9<\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>10<\/td>\r\n<td>30<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Em nosso caso faremos o <em>cluster<\/em> sobre o g\u00eanero, criando assim dois grupos: feminino e masculino.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Grupo Feminino<\/strong>:<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td>Id<\/td>\r\n<td>Idade<\/td>\r\n<td>G\u00eanero<\/td>\r\n<td>Cal\u00e7a<\/td>\r\n<td>Cal\u00e7ado<\/td>\r\n<td>Camisa<\/td>\r\n<td>Camisa<\/td>\r\n<td>Vestido<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>3<\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>4<\/td>\r\n<td>31<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>5<\/td>\r\n<td>18<\/td>\r\n<td>F<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>7<\/td>\r\n<td>35<\/td>\r\n<td>F<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>9<\/td>\r\n<td>25<\/td>\r\n<td>F<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>Grupo Masculino<\/strong><\/h4>\r\n\r\n\r\n\r\n<figure class=\"wp-block-table\">\r\n<table>\r\n<tbody>\r\n<tr>\r\n<td>Id<\/td>\r\n<td>Idade<\/td>\r\n<td>G\u00eanero<\/td>\r\n<td>Cal\u00e7a<\/td>\r\n<td>Cal\u00e7ado<\/td>\r\n<td>Camisa<\/td>\r\n<td>Camisa<\/td>\r\n<td>Vestido<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>1<\/td>\r\n<td>27<\/td>\r\n<td>M<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>2<\/td>\r\n<td>30<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>6<\/td>\r\n<td>40<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>8<\/td>\r\n<td>24<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>10<\/td>\r\n<td>30<\/td>\r\n<td>M<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>0<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Dessa forma, quando um cliente entrar em nosso <em>e-commerce<\/em>, podemos adicionar ele ao grupo feminino ou masculino. E ent\u00e3o, ao inv\u00e9s de testarmos item a item podemos testar apenas os itens que s\u00e3o pertinentes \u00e0quele grupo, ou seja, os itens que s\u00e3o comprados com frequ\u00eancia pelo grupo.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Claro que dentro de cada grupo podemos agrupar ainda mais, por exemplo: por idade, por pe\u00e7a comprada e etc&#8230;<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong><em>&gt;&gt; Leitura Recomendada:<\/em><\/strong><em><br \/><\/em><a href=\"https:\/\/geekblogti.wpengine.com\/mineracao-de-texto-python-para-descobrir-emocoes\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Minera\u00e7\u00e3o de texto: (abre numa nova aba)\"><strong><em>Minera\u00e7\u00e3o de texto:<\/em><\/strong><\/a><em> python para descobrir emo\u00e7\u00f5es<\/em><\/p>\r\n\r\n\r\n\r\n<h2 class=\"wp-block-heading\">Conclus\u00e3o<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ao longo desse artigo percebemos que cada um dos algoritmos de aprendizagem de m\u00e1quina servem a prop\u00f3sitos espec\u00edficos, sendo poss\u00edvel a integra\u00e7\u00e3o de ambos. Em nosso caso mostramos como os algoritmos de <strong>aprendizagem de m\u00e1quina supervisionado e n\u00e3o supervisionado <\/strong>podem ser utilizados para melhorar o marketing e as vendas.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Enfim, eu trouxe este exemplo pois acredito ser muito interessante e apenas arranhamos o que pode ser explorado aqui. Podemos, por exemplo, fazer an\u00e1lise de tend\u00eancia de roupas, vis\u00e3o computacional, detectar padr\u00f5es em roupas e, assim, fazer agrupamento de roupas com base em caracter\u00edsticas principais, enfim, as possibilidade s\u00e3o imensas nessa \u00e1rea.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>Cada vez mais somos apresentados a casos de sucesso envolvendo a implementa\u00e7\u00e3o de algoritmos de aprendizagem de m\u00e1quina (machine learning) como Facebook, Netflix, Ifood, entre outros. Dessa forma, voc\u00ea decide trazer essa \u2018boa nova\u2019 aos seus neg\u00f3cios para acelerar suas vendas, ou criar campanhas de marketing mais atraentes e com isso obter um maior engajamento [&hellip;]<\/p>\n","protected":false},"author":167,"featured_media":6235,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[269],"tags":[],"class_list":["post-6227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-machinelearning-ai"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Aprendizagem de M\u00e1quina: Supervisionada ou N\u00e3o?<\/title>\n<meta name=\"description\" content=\"N\u00e3o sabe qual tipo de aprendizagem de m\u00e1quina usar no seu com\u00e9rcio? 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