{"id":149,"date":"2021-10-15T22:15:25","date_gmt":"2021-10-15T14:15:25","guid":{"rendered":"https:\/\/scutvk.cn\/?p=149"},"modified":"2021-10-18T20:52:09","modified_gmt":"2021-10-18T12:52:09","slug":"%e6%9b%b4%e6%96%b0%e4%b8%adpytorch%e5%ad%a6%e4%b9%a0%e8%ae%b0%e5%bd%952","status":"publish","type":"post","link":"https:\/\/scutvk.cn\/?p=149","title":{"rendered":"Pytorch\u5b66\u4e60\u8bb0\u5f55[2]"},"content":{"rendered":"\n

\u9879\u76ee\u5168\u6e90\u7801\u53ca\u6570\u636e\u96c6:http:\/\/netdisk.scutvk.cn\/pytorch_lesson_1.zip<\/a> <\/p>\n\n\n\n

Dataloader\u7684\u4f7f\u7528<\/strong><\/p>\n\n\n\n

\u6211\u4eec\u9996\u5148\u5bfc\u5165\u4e2a\u6570\u636e\u96c6<\/p>\n\n\n\n

import torchvision\nfrom torch.utils.data import DataLoader\n\n\n\n\ntest_data = torchvision.datasets.CIFAR10(\".\/dataset\", train=False, transform=torchvision.transforms.ToTensor())<\/code><\/pre>\n\n\n\n
\u4f1a\u62a5\u9519\u5982\u4e0b<\/p>\n\n\n\n
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\u56fe1<\/figcaption><\/figure><\/div>\n\n\n\n
\u8bf4\u6211\u4eec\u8fd8\u8981\u4e0b\u8f7d\uff0c\u90a3\u4e48\u6211\u4eec\u7ed9\u591a\u4e00\u4e2a\u53c2\u6570 download=True<\/p>\n\n\n\n
import torchvision\nfrom torch.utils.data import DataLoader\n\n\ntest_data = torchvision.datasets.CIFAR10(\".\/dataset\", train=False, transform=torchvision.transforms.ToTensor(), downloader=True)\n\n<\/code><\/pre>\n\n\n\n
\u540e\u6765\u53c8\u6709\u62a5\u9519\u5982\u4e0b<\/p>\n\n\n\n
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\u56fe2<\/figcaption><\/figure><\/div>\n\n\n\n
\u53ef\u89c1\u662f\u5173\u4e8essl\u8bc1\u4e66\u7684\uff0c\u5e94\u8be5\u662f\u4e0b\u8f7d\u6e90\u7528\u4e86https\u534f\u8bae\uff0c\u90a3\u6211\u4eec\u7981\u7528https<\/p>\n\n\n\n
\u5728\u6e90\u7801\u4e2d\u52a0\u4e0a\u4ee5\u4e0b\u4e24\u884c<\/p>\n\n\n\n
import ssl\nssl._create_default_https_context = ssl._create_unverified_context<\/code><\/pre>\n\n\n\n
\u7136\u540e\u4fbf\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u4e86<\/p>\n\n\n\n
\u6211\u4eec\u518d\u770b\u770b\u53d8\u91cftest_data\u7684\u6570\u636e<\/p>\n\n\n\n
import torchvision\nfrom torch.utils.data import DataLoader\n\n\n\n\n\ntest_data = torchvision.datasets.CIFAR10(\".\/dataset\", train=False, transform=torchvision.transforms.ToTensor())\n\n\n\n#\u4ec5\u63d0\u53d61\u5f20\u56fe\u7247\nimg, target = test_data[0]\nprint(img.shape)\nprint(target)<\/code><\/pre>\n\n\n\n
\u8f93\u51fa<\/p>\n\n\n\n
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\u56fe3<\/figcaption><\/figure><\/div>\n\n\n\n
\u52a0\u4e0aDataloader\u4e4b\u540e<\/p>\n\n\n\n
import torchvision\nfrom torch.utils.data import DataLoader\n\n#import ssl\n#ssl._create_default_https_context = ssl._create_unverified_context\n\n#test_data = torchvision.datasets.CIFAR10(\".\/dataset\", train=False, download=True, transform=torchvision.transforms.ToTensor())\nfrom torch.utils.tensorboard import SummaryWriter\n\ntest_data = torchvision.datasets.CIFAR10(\".\/dataset\", train=False, transform=torchvision.transforms.ToTensor())\ntest_loader = DataLoader(dataset=test_data, batch_size=48, shuffle=False, num_workers=0, drop_last=False)\n\n#\u4ec5\u63d0\u53d61\u5f20\u56fe\u7247\nimg, target = test_data[0]\nprint(img.shape)\nprint(target)\n\nprint(len(test_data))\n#\u4f7f\u7528SummaryWriter & Dataloader \u63d0\u53d6\u5c55\u793a\u6570\u636e\u96c6\u4e2d\u7684\u56fe\u7247\nwriter = SummaryWriter(\"dataloader-logs\")\n\nfor epoch in range(2):\n    step = 0\n    for data in test_loader:\n        imgs, targets = data\n        #print(imgs)\n        #print(targets)\n        writer.add_images(\"shuffle_False: {}\".format(epoch), imgs, step)\n        step += 1<\/code><\/pre>\n\n\n\n
Dataloader\u7684\u6784\u9020\u51fd\u6570\u5b98\u7f51\u67e5\u9605\u6587\u6863<\/p>\n\n\n\n
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\u56fe4\u3001Pytorch\u5b98\u7f51\u6587\u6863Dataloader<\/figcaption><\/figure><\/div>\n\n\n\n
batch_size: \u6bcf\u6b21Dataloader\u4ece\u6570\u636e\u96c6\u4e2d\u53d6\u5f97\u7684\u6837\u672c\u91cf<\/strong><\/p>\n\n\n\n
shuffle: \u591a\u6b21\u4f7f\u7528Dataloader\u65f6\uff0cDataloader\u4f20\u51fa\u7684\u6570\u636e\u662f\u5426\u987a\u5e8f\u76f8\u540c<\/strong><\/p>\n\n\n\n
drop_last: \u5f53\u6570\u636e\u91cf\u4e0d\u88abbatch_size\u6574\u9664\u65f6\uff0c\u4f59\u4e0b\u7684\u6570\u636e\u662f\u5426\u4fdd\u7559\uff08\u82e5\u4fdd\u7559\uff0c\u5219\u6700\u540e\u4e00\u6b21\u7684\u6570\u636e\u91cf\u4e0d\u8db3batch_size\uff09<\/strong><\/p>\n\n\n\n
\u7a0b\u5e8f\u6267\u884c\u5173\u952e\u6d41\u7a0b:<\/p>\n\n\n\n
\u5728for data in test_loader: \u5904\uff0c\u6bcf\u6b21\u90fd\u4f1a\u4ecetest_loader\u4e2d\u53d6\u51fa1\u4e2a\u7ed9data\uff0c\u800c\u7ed9data\u7684\u8fd9\u4e2a\u6570\u636e\u53c8\u5305\u542b\u4e8648\u5f20\u56fe\u7247\u4ee5\u53ca\u56fe\u7247\u7684target\u6807\u7b7e\u3002<\/p>\n\n\n\n
\u5f53\u6211\u4eec\u7528imgs, targets = data\u7684\u65f6\u5019\uff0c\u6211\u4eec\u63d0\u53d6\u51fa\u4e86\u8fd948\u5f20\u56fe\u7247\u5230imgs\uff0c\u5728\u901a\u8fc7add_images()\u6dfb\u52a0\u5230\u6211\u4eec\u7684tensorboard<\/p>\n\n\n\n
\u6700\u5916\u9762\u7684for\u5faa\u73af\u7528\u4e8e\u770b\u770bshuffle\u7684\u4f5c\u7528<\/p>\n\n\n\n
shuffle=True<\/p>\n\n\n\n
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\u56fe5<\/figcaption><\/figure><\/div>\n\n\n\n
shuffle=False<\/p>\n\n\n\n
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\u56fe6<\/figcaption><\/figure><\/div>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u9879\u76ee\u5168\u6e90\u7801\u53ca\u6570\u636e\u96c6:http:\/\/netdisk.…<\/p>\n","protected":false},"author":1,"featured_media":156,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[10,12,2],"tags":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/scutvk.cn\/wp-content\/uploads\/2021\/10\/image-26.png","_links":{"self":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts\/149"}],"collection":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=149"}],"version-history":[{"count":3,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts\/149\/revisions"}],"predecessor-version":[{"id":167,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/posts\/149\/revisions\/167"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=\/wp\/v2\/media\/156"}],"wp:attachment":[{"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=149"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=149"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scutvk.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=149"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}