Why do we need to upsampling the image to 224?

[nmpn]

Hi,

Can you please tell me why do we need to upsampling to 224 in preprocess stage?

torch_img = F.upsample(torch_img, size=(224, 224), mode='bilinear', align_corners=False)

I used my own model and if I don't upsample to 224,224, the results seem not correct.

Thank you.

[PeterKim1]

Hello. I do not make this code, but i know your question's answer.

Because alexnet, vgg, resnet, densenet, squeezenet is Pretrained model, and this models trained at ImageNet.

ImageNet data's resolution is 224x224, so input shape must be 224x224.

If you don't want to upsample your data, you need to train models from scratch, can't use pretrained model.

[nmpn]

Hi,

Thanks for your response.

I’m using my own model, not the pre-trained one. If I don’t upsample, the results look incorrect, hence my question.

On 9 May 2021, at 13:45, @.*** wrote:



Hello. I do not make this code, but i know your question's answer.

Because alexnet, vgg, resnet, densenet, squeezenet is Pretrained model, and this models trained at ImageNet.

ImageNet data's resolution is 224x224, so input shape must be 224x224.

If you don't want to upsample your data, you need to train models from scratch, can't use pretrained model.

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