{"id":7516,"date":"2026-01-29T11:38:00","date_gmt":"2026-01-29T02:38:00","guid":{"rendered":"https:\/\/blog.since2020.jp\/?p=7516"},"modified":"2026-01-29T11:38:00","modified_gmt":"2026-01-29T02:38:00","slug":"try_all_padding_mode","status":"publish","type":"post","link":"https:\/\/since2020.jp\/media\/try_all_padding_mode\/","title":{"rendered":"nn.Conv2d\u306epadding_mode\u3092\u5168\u90e8\u8a66\u3057\u3066\u307f\u308b"},"content":{"rendered":"<h2>\u306f\u3058\u3081\u306b<\/h2>\n<p>\u753b\u50cf\u3084\u6642\u7cfb\u5217\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066nn.Conv2d\u3092\u4f7f\u7528\u3059\u308b\u969b\u3001\u30b5\u30a4\u30ba\u3092\u5909\u66f4\u305b\u305a\u3001\u7aef\u306e\u60c5\u5831\u3092\u6b20\u843d\u3055\u305b\u306a\u3044\u3088\u3046\u306b\u30d1\u30c7\u30a3\u30f3\u30b0\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002\u4eca\u56de\u306fpadding_mode\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u5229\u7528\u3057\u3001\u7570\u306a\u308b\u30d1\u30c7\u30a3\u30f3\u30b0\u65b9\u6cd5\u304c\u7573\u307f\u8fbc\u307f\u7d50\u679c\u306b\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3059\u3002\u306a\u304a\u3001\u305d\u306e\u4ed6\u306e\u5f15\u6570\u306b\u3064\u3044\u3066\u306f\u4eca\u56de\u7d30\u304b\u304f\u306f\u89e6\u308c\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306e\u30d6\u30ed\u30b0\u3092\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><a href=\"https:\/\/blog.since2020.jp\/ai\/effect_of_arguments\/\">https:\/\/blog.since2020.jp\/ai\/effect_of_arguments\/<\/a><\/p>\n<p><!-- notionvc: dfc207af-8261-456f-beae-ee2b876aa673 --><\/p>\n<h2>\u76ee\u7684\u3068\u80cc\u666f<\/h2>\n<p>padding_mode\u3068\u3044\u3046\u5f15\u6570\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u7573\u307f\u8fbc\u307f\u306e\u969b\u306b\u5468\u8fba\u306e\u30c7\u30fc\u30bf\u3092\u3069\u306e\u3088\u3046\u306b\u57cb\u3081\u308b\u304b\u3092\u5236\u5fa1\u3067\u304d\u307e\u3059\u3002\u516c\u5f0f\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u306f\u3001\u3053\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u6307\u5b9a\u3067\u304d\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u306e\u8a73\u7d30\u3084\u5b9f\u969b\u306e\u6319\u52d5\u306b\u3064\u3044\u3066\u306f\u660e\u78ba\u306b\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u305d\u3053\u3067\u3001\u4eca\u56de\u306f padding_mode\u3092\u5909\u66f4\u3057\u3001\u7c21\u6613\u7684\u306a\u767d\u9ed2\u753b\u50cf\u306b\u5bfe\u3057\u3066\u7573\u307f\u8fbc\u307f\u51e6\u7406\u3092\u5b9f\u884c\u3057\u3066\u3001\u305d\u306e\u6319\u52d5\u3092\u89b3\u5bdf\u3057\u3066\u3044\u304d\u307e\u3059\u3002<!-- notionvc: 2a5e8991-2e6c-42eb-8756-777041571f46 --><\/p>\n<h2>padding_mode\u306b\u3064\u3044\u3066<\/h2>\n<p>padding_mode\u306b\u306f\u3001\u4ee5\u4e0b\u306e4\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u52d5\u4f5c\u306b\u3064\u3044\u3066\u5177\u4f53\u7684\u306a\u4f8b\u3092\u6319\u3052\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>padding_mode=\u2019zeros\u2019\n<ul>\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u8a2d\u5b9a\u3067\u3059\u3002\u753b\u50cf\u306e\u5916\u5074\u3092\u30bc\u30ed\u3067\u57cb\u3081\u307e\u3059\u3002\u3053\u308c\u304c\u6700\u3082\u4e00\u822c\u7684\u306a\u30bc\u30ed\u30d1\u30c7\u30a3\u30f3\u30b0\u3067\u3059\u3002<\/li>\n<li>\u4f8b\uff1a<code>padding=2<\/code> \u306e\u5834\u5408\u3001\u914d\u5217 <code>[1, 2, 3, 4, 5]<\/code> \u306f <code>[0, 0, 1, 2, 3, 4, 5, 0, 0]<\/code> \u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li>padding_mode=\u2019reflect\u2019\n<ul>\n<li>\u30a8\u30c3\u30b8\u306e\u5c11\u3057\u5185\u5074\u3092\u93e1\u306e\u3088\u3046\u306b\u53cd\u8ee2\u3055\u305b\u3066\u57cb\u3081\u307e\u3059\u3002\u753b\u50cf\u306e\u7aef\u306e\u60c5\u5831\u304c\u53cd\u8ee2\u3057\u3066\u7e70\u308a\u8fd4\u3055\u308c\u308b\u3053\u3068\u3067\u3001\u30a8\u30c3\u30b8\u90e8\u5206\u306e\u60c5\u5831\u304c\u81ea\u7136\u306b\u88dc\u5b8c\u3055\u308c\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a<code>padding=2<\/code> \u306e\u5834\u5408\u3001\u914d\u5217 <code>[1, 2, 3, 4, 5]<\/code> \u306f <code>[3, 2, 1, 2, 3, 4, 5, 4, 3]<\/code> \u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li>padding_mode=\u2019replicate\u2019\n<ul>\n<li>\u30a8\u30c3\u30b8\u306e\u5024\u3092\u305d\u306e\u307e\u307e\u8907\u88fd\u3057\u3066\u5916\u5074\u306b\u5e83\u3052\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30a8\u30c3\u30b8\u60c5\u5831\u304c\u5f15\u304d\u5ef6\u3070\u3055\u308c\u3001\u7aef\u306e\u60c5\u5831\u304c\u81ea\u7136\u306b\u7e70\u308a\u8fd4\u3055\u308c\u308b\u5f62\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a<code>padding=2<\/code> \u306e\u5834\u5408\u3001\u914d\u5217 <code>[1, 2, 3, 4, 5]<\/code> \u306f <code>[1, 1, 1, 2, 3, 4, 5, 5, 5]<\/code> \u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li>padding_mode=\u2019circular\u2019\n<ul>\n<li>\u914d\u5217\u3092\u8f2a\u3063\u304b\u306e\u3088\u3046\u306b\u6271\u3044\u3001\u5916\u306b\u51fa\u305f\u5206\u3092\u53cd\u5bfe\u5074\u304b\u3089\u6301\u3063\u3066\u304d\u3066\u57cb\u3081\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7aef\u306e\u5024\u304c\u53cd\u5bfe\u5074\u304b\u3089\u5faa\u74b0\u3057\u3066\u7e4b\u304c\u308b\u5f62\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li>\u4f8b\uff1a<code>padding=2<\/code> \u306e\u5834\u5408\u3001\u914d\u5217 <code>[1, 2, 3, 4, 5]<\/code> \u306f <code>[4, 5, 1, 2, 3, 4, 5, 1, 2]<\/code> \u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><!-- notionvc: ef7f1985-26c8-47f2-b8ba-0c7c10e726af --><\/p>\n<h2>\u5b9f\u9a13<\/h2>\n<p><b>\u74b0\u5883\u8a2d\u5b9a<\/b><\/p>\n<p>\u4eca\u56de\u306f Google Colab \u306e\u30ce\u30fc\u30c8\u30d6\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3001\u7573\u307f\u8fbc\u307f\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002\u307e\u305a\u306f\u5fc5\u8981\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30a4\u30f3\u30dd\u30fc\u30c8\u304b\u3089\u3002<\/p>\n<pre><code class=\"language-python\"><\/code><\/pre>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>import numpy as np\r\nimport torch import torch.nn as nn\r\nimport torch.nn.functional as F \r\nimport matplotlib.pyplot as plt<\/code><\/pre>\n<\/div>\n<pre><code class=\"language-python\"><\/code><\/pre>\n<p>\u4eca\u56de\u306f5\u00d75\u306e\u767d\u9ed2\u30e2\u30b6\u30a4\u30af\u753b\u50cf\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<pre><code class=\"language-python\"><\/code><\/pre>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>def show(img, title=\"\"):\r\n    plt.figure(figsize=(3, 3)) \r\n    plt.imshow(img, cmap=\"gray\", vmin=0, vmax=1) \r\n    plt.title(title) \r\n    plt.axis(\"off\") \r\n    plt.show()<span style=\"font-family: Consolas, Monaco, monospace;background-color: #ffffff;color: #333333;font-size: 16px\"><\/span><code class=\"language-python\" style=\"font-size: 16px\"> <code class=\"language-python\">img = torch.arange(25.0).reshape(1, 1, 5, 5) \/ 24.0 \r\nshow(img[0,0].numpy(), \"Original 5x5 Image\")<\/code><\/code><\/code><\/pre>\n<\/div>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/image-1.png\" alt=\"\" width=\"250\" height=\"273\" class=\"size-full wp-image-7523 aligncenter\" \/><\/p>\n<pre>\u4ee5\u4e0b\u3001padding_mode\u3054\u3068\u306b\u7573\u307f\u8fbc\u307f\u51e6\u7406\u3092\u884c\u3044\u3001\u7573\u307f\u8fbc\u307f\u524d\u3068\u5f8c\u306e\u753b\u50cf\u3092\u6bd4\u8f03\u3057\u3066\u3044\u304d\u307e\u3059\u3002<code class=\"language-python\"><\/code><\/pre>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>import torch \r\nimport torch.nn as nn \r\nimport matplotlib.pyplot as plt \r\n\r\nx = torch.arange(25.0).reshape(1, 1, 5, 5) \/ 24.0 \r\nconv = nn.Conv2d(1, 1, 3, padding=1, padding_mode=\"zeros\") \r\nconv.weight.data[:] = 1\/9 \r\n\r\ny = conv(x) \r\n\r\nfig, axes = plt.subplots(1, 2, figsize=(6, 3)) \r\naxes[0].imshow(x[0, 0].detach().numpy(), cmap=\"gray\", vmin=0, vmax=1) \r\naxes[0].set_title(\"Original 5x5\") \r\naxes[0].axis(\"off\") \r\n\r\naxes[1].imshow(y[0, 0].detach().numpy(), cmap=\"gray\", vmin=0, vmax=1) \r\naxes[1].set_title(\"padding_mode=reflect\") \r\naxes[1].axis(\"off\") \r\n\r\nplt.tight_layout() \r\nplt.show()<!-- notionvc: 43ac63cb-2e69-45aa-8b4b-20db97d1f983 --><\/code><\/pre>\n<\/div>\n<pre><code class=\"language-python\"><\/code><\/pre>\n<p><b>\u7d50\u679c<\/b><\/p>\n<ol>\n<li style=\"list-style-type: none\">\n<ol>\n<li>\n<p>padding_mode=\u2019zeros\u2019<\/p>\n<p>0\u3067\u57cb\u3081\u308b\u306e\u3067\u5916\u5800\u306f\u771f\u3063\u9ed2\u306b\u306a\u308a\u307e\u3059\u3002\u78ba\u304b\u306b\u5168\u4f53\u7684\u306b\u30a8\u30c3\u30b8\u304c\u6697\u304f\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<p><code class=\"language-python\"><img decoding=\"async\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/zeros-300x158.png\" alt=\"\" width=\"300\" height=\"158\" class=\" wp-image-7519 aligncenter\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/zeros-300x158.png 300w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/zeros.png 569w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/code><\/p>\n<\/li>\n<li>\n<p>padding_mode=\u2019reflect\u2019<\/p>\n<ul>\n<li>\n<p>\u4eca\u56de\u306fpadding=1\u306e\u305f\u3081\u3001\u30a8\u30c3\u30b8\u306e1\u3064\u5185\u5074\u306e\u60c5\u5831\u3067\u5916\u5800\u3092\u57cb\u3081\u307e\u3059\u3002\u30a8\u30c3\u30b8\u304c\u5168\u4f53\u7684\u306b\u5e73\u5747\u5316\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/reflect-300x158.png\" alt=\"\" width=\"300\" height=\"158\" class=\"size-medium wp-image-7520 aligncenter\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/reflect-300x158.png 300w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/reflect.png 569w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>padding_mode=\u2019replicate\u2019<\/p>\n<ul>\n<li>\n<p>\u30a8\u30c3\u30b8\u306e\u60c5\u5831\u3092\u305d\u306e\u307e\u307e\u5916\u306b\u8907\u88fd\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u7573\u307f\u8fbc\u3093\u3067\u3082\u305d\u308c\u307b\u3069\u30aa\u30ea\u30b8\u30ca\u30eb\u3068\u8272\u5408\u3044\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/replicate-300x158.png\" alt=\"\" width=\"300\" height=\"158\" class=\"size-medium wp-image-7521 aligncenter\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/replicate-300x158.png 300w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/replicate.png 569w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>padding_mode=\u2019circular\u2019<\/p>\n<ul>\n<li>\n<p>\u9ed2\u306e\u8fd1\u8fba\u306f\u767d\u3067\u57cb\u3081\u3001\u767d\u3044\u753b\u7d20\u306e\u8fd1\u8fba\u306f\u9ed2\u3067\u57cb\u3081\u307e\u3059\u3002\u5168\u30bb\u30eb\u304c\u8fd1\u3044\u8272\u5408\u3044\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/circular-300x158.png\" alt=\"\" width=\"300\" height=\"158\" class=\"size-medium wp-image-7522 aligncenter\" srcset=\"https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/circular-300x158.png 300w, https:\/\/since2020.jp\/media\/wp-content\/uploads\/2025\/12\/circular.png 569w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><!-- notionvc: 36eb57b6-f29b-4415-9deb-c9e76b4503c0 --><\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<ul>\n<li>Conv2d\u306b\u304a\u3051\u308bpadding_mode\u306e\u9055\u3044\u3092\u5b9f\u4f8b\u3068\u3068\u3082\u306b\u7d39\u4ecb\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u79c1\u3082\u666e\u6bb5\u30bc\u30ed\u30d1\u30c7\u30a3\u30f3\u30b0\u3070\u304b\u308a\u4f7f\u3063\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u7573\u307f\u8fbc\u3080\u30c7\u30fc\u30bf\u306b\u3088\u3063\u3066\u306fpadding_mode\u306e\u5909\u66f4\u3067\u5927\u304d\u306a\u5dee\u304c\u51fa\u305d\u3046\u3067\u3059\u3002<\/li>\n<li>\u4eca\u56de\u306f\u753b\u50cf\u30c7\u30fc\u30bf\u306b\u4f7f\u7528\u3057\u307e\u3057\u305f\u304c\u3001\uff12\u6b21\u5143\u914d\u5217\u3067\u3042\u308c\u3070\u4f55\u306b\u3067\u3082\u9069\u7528\u3067\u304d\u307e\u3059\u3002\u753b\u50cf\u306f\u7aef\u306e\u60c5\u5831\u304c\u305d\u308c\u307b\u3069\u91cd\u8981\u3067\u306a\u3044\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u304c\u3001\u4f8b\u3048\u3070\u591a\u5909\u91cf\u6642\u7cfb\u5217\u30c7\u30fc\u30bf\u306e\u5834\u5408\u3001\u7aef\u306e\u65b9\u306b\u4f4d\u7f6e\u3059\u308b\u5909\u6570\u60c5\u5831\u304c\u6b20\u843d\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u3082\u3042\u308b\u305f\u3081\u3001\u30d1\u30c7\u30a3\u30f3\u30b0\u306e\u9069\u5207\u306a\u9078\u629e\u304c\u809d\u306b\u306a\u3063\u3066\u304f\u308b\u3068\u8003\u3048\u307e\u3059\u3002<\/li>\n<\/ul>\n<p><!-- 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