GEN_2_DCGAN.ipynb unzip zipurl file fail.

[zhaosongyi]

it has showed: Downloaded & Extracted https://www.dropbox.com/s/kgqofw91l8m1mk6/celeba.zip?dl=1 but excute the next cell : ... FileNotFoundError: Found no valid file for the classes celeba. Supported extensions are: .jpg, .jpeg, .png, .ppm, .bmp, .pgm, .tif, .tiff, .webp

[john-sandall]

The problem

The problem here is that torchvision.datasets.ImageFolder scans the directory provided assuming it contains subdirectories mapping to classes, containing images pertaining to those closes.

At some point, someone re-uploaded the celeba.zip generated from a folder called img_align_celeba/, so unzipping creates a folder with this name instead of putting the images into the celeba/ folder.

The next cell fails because it sees two folders, celeba/ and img_align_celeba/, treats these as distinct classes for prediction, and complains that the celeba class folder is empty of images.

Solutions

Quick fix for anyone seeing this: just add these two lines at the bottom of the DOWNLOAD IMAGES cell or in a new cell, but before the LOAD IMAGES cell.

os.rmdir('./data/celeba/')
os.rename('./data/img_align_celeba', './data/celeba')

Better fix for the notebook: no need to create the celeba directory in the first place, the folder renaming is still worth doing.