Missing human annotation for validation image 58c970f287de7333 about dataset

[rkrasin]

@krikru missing human annotations for some images in the validation set is not much of a special case. I tried to raise a point that we need to reduce the number of such cases, and quite possibly it has been made (if you say, it's just one image)

As for the missing Thumbnail300KURL, it's also kind of normal as Flickr does not provide such thumbnails for some images and also some images (in general) might not be from Flickr. In train set, there are 204380 images with missing Thumbnail300KURL. For them, just use OriginalURL and resize, if needed.