{"id":3790,"date":"2021-02-24T13:44:05","date_gmt":"2021-02-24T12:44:05","guid":{"rendered":"https:\/\/www.ceessnoek.info\/?p=3790"},"modified":"2021-02-24T13:49:12","modified_gmt":"2021-02-24T12:49:12","slug":"iclr-2021-liftpool-bidirectional-convnet-pooling","status":"publish","type":"post","link":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/","title":{"rendered":"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"535\" src=\"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-1024x535.png\" alt=\"\" class=\"wp-image-3776\" srcset=\"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-1024x535.png 1024w, https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-300x157.png 300w, https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-768x401.png 768w, https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool.png 1532w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p>The cam-ready of the ICLR 2021 paper &#8220;<em>LiftPool: Bidirectional ConvNet Pooling<\/em>&#8221; by <a href=\"https:\/\/staff.fnwi.uva.nl\/j.zhao3\/\">Jiaojiao Zhao <\/a>and Cees Snoek is <a href=\"https:\/\/isis-data.science.uva.nl\/cgmsnoek\/pub\/zhao-liftpool-iclr2021.pdf\">now available<\/a>. Pooling is a critical operation in convolutional neural networks for increasing receptive fields and improving robustness to input variations. Most existing pooling operations downsample the feature maps, which is a lossy process. Moreover, they are not invertible: upsampling a downscaled feature map can not recover the lost information in the downsampling. By adopting the philosophy of the classical Lifting Scheme from signal processing, we propose LiftPool for bidirectional pooling layers, including LiftDownPool and LiftUpPool. LiftDownPool decomposes a feature map into various downsized sub-bands, each of which contains information with different frequencies. As the pooling function in LiftDownPool is perfectly invertible, by performing LiftDownPool backwards, a corresponding up-pooling layer LiftUpPool is able to generate a refined upsampled feature map using the detail sub-bands, which is useful for image-to-image translation challenges. Experiments show the proposed methods achieve better results on image classification and semantic segmentation, using various backbones. Moreover, LiftDownPool offers better robustness to input corruptions and perturbations.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The cam-ready of the ICLR 2021 paper &#8220;LiftPool: Bidirectional ConvNet Pooling&#8221; by Jiaojiao Zhao and Cees Snoek is now available. Pooling is a critical operation in convolutional neural networks for increasing receptive fields and improving robustness to input variations. Most existing pooling operations downsample the feature maps, which is a lossy process. Moreover, they are [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-3790","post","type-post","status-publish","format-standard","hentry","category-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ICLR 2021: LiftPool: Bidirectional ConvNet Pooling - Cees Snoek<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling - Cees Snoek\" \/>\n<meta property=\"og:description\" content=\"The cam-ready of the ICLR 2021 paper &#8220;LiftPool: Bidirectional ConvNet Pooling&#8221; by Jiaojiao Zhao and Cees Snoek is now available. Pooling is a critical operation in convolutional neural networks for increasing receptive fields and improving robustness to input variations. Most existing pooling operations downsample the feature maps, which is a lossy process. Moreover, they are [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/\" \/>\n<meta property=\"og:site_name\" content=\"Cees Snoek\" \/>\n<meta property=\"article:published_time\" content=\"2021-02-24T12:44:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-02-24T12:49:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-1024x535.png\" \/>\n<meta name=\"author\" content=\"Cees\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Cees\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/\",\"url\":\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/\",\"name\":\"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling - Cees Snoek\",\"isPartOf\":{\"@id\":\"https:\/\/www.ceessnoek.info\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-1024x535.png\",\"datePublished\":\"2021-02-24T12:44:05+00:00\",\"dateModified\":\"2021-02-24T12:49:12+00:00\",\"author\":{\"@id\":\"https:\/\/www.ceessnoek.info\/#\/schema\/person\/4bca975b7c432aeb5dced40bdbc204c1\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#primaryimage\",\"url\":\"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool.png\",\"contentUrl\":\"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool.png\",\"width\":1532,\"height\":800},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.ceessnoek.info\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.ceessnoek.info\/#website\",\"url\":\"https:\/\/www.ceessnoek.info\/\",\"name\":\"Cees Snoek\",\"description\":\"research on video and image ai\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.ceessnoek.info\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.ceessnoek.info\/#\/schema\/person\/4bca975b7c432aeb5dced40bdbc204c1\",\"name\":\"Cees\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.ceessnoek.info\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/756ccb993852c1e8e3af39a228d11a7305b2a937750f26dc5799d5df019b0f51?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/756ccb993852c1e8e3af39a228d11a7305b2a937750f26dc5799d5df019b0f51?s=96&d=mm&r=g\",\"caption\":\"Cees\"},\"sameAs\":[\"http:\/\/www.CeesSnoek.info\"],\"url\":\"https:\/\/www.ceessnoek.info\/index.php\/author\/admin\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling - Cees Snoek","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/","og_locale":"en_US","og_type":"article","og_title":"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling - Cees Snoek","og_description":"The cam-ready of the ICLR 2021 paper &#8220;LiftPool: Bidirectional ConvNet Pooling&#8221; by Jiaojiao Zhao and Cees Snoek is now available. Pooling is a critical operation in convolutional neural networks for increasing receptive fields and improving robustness to input variations. Most existing pooling operations downsample the feature maps, which is a lossy process. Moreover, they are [&hellip;]","og_url":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/","og_site_name":"Cees Snoek","article_published_time":"2021-02-24T12:44:05+00:00","article_modified_time":"2021-02-24T12:49:12+00:00","og_image":[{"url":"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-1024x535.png","type":"","width":"","height":""}],"author":"Cees","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Cees","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/","url":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/","name":"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling - Cees Snoek","isPartOf":{"@id":"https:\/\/www.ceessnoek.info\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#primaryimage"},"image":{"@id":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#primaryimage"},"thumbnailUrl":"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool-1024x535.png","datePublished":"2021-02-24T12:44:05+00:00","dateModified":"2021-02-24T12:49:12+00:00","author":{"@id":"https:\/\/www.ceessnoek.info\/#\/schema\/person\/4bca975b7c432aeb5dced40bdbc204c1"},"breadcrumb":{"@id":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#primaryimage","url":"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool.png","contentUrl":"https:\/\/www.ceessnoek.info\/wp-content\/uploads\/2021\/01\/zhao-liftpool.png","width":1532,"height":800},{"@type":"BreadcrumbList","@id":"https:\/\/www.ceessnoek.info\/index.php\/iclr-2021-liftpool-bidirectional-convnet-pooling\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.ceessnoek.info\/"},{"@type":"ListItem","position":2,"name":"ICLR 2021: LiftPool: Bidirectional ConvNet Pooling"}]},{"@type":"WebSite","@id":"https:\/\/www.ceessnoek.info\/#website","url":"https:\/\/www.ceessnoek.info\/","name":"Cees Snoek","description":"research on video and image ai","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.ceessnoek.info\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.ceessnoek.info\/#\/schema\/person\/4bca975b7c432aeb5dced40bdbc204c1","name":"Cees","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.ceessnoek.info\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/756ccb993852c1e8e3af39a228d11a7305b2a937750f26dc5799d5df019b0f51?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/756ccb993852c1e8e3af39a228d11a7305b2a937750f26dc5799d5df019b0f51?s=96&d=mm&r=g","caption":"Cees"},"sameAs":["http:\/\/www.CeesSnoek.info"],"url":"https:\/\/www.ceessnoek.info\/index.php\/author\/admin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/posts\/3790","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/comments?post=3790"}],"version-history":[{"count":2,"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/posts\/3790\/revisions"}],"predecessor-version":[{"id":3792,"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/posts\/3790\/revisions\/3792"}],"wp:attachment":[{"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/media?parent=3790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/categories?post=3790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ceessnoek.info\/index.php\/wp-json\/wp\/v2\/tags?post=3790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}