SBDataset downloads fails because train_noval.txt is no more available at the specified url about vision HOT 3 OPEN

Thank you for the suggested PR.

In the meantime, I contacted Bharath to let him know the file was not available anymore. Apparently, he found the file and expects to put it online again pretty soon ;

I will let you know.

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Thanks for the report @jeremyfix , I can reproduce the issue.

You're right that it's related to the download of train_noval.txt. I'm getting a 403 Forbidden error and I'm being redirected to https://www.cs.cornell.edu/~bharathh/.

If this file can be found somewhere else, please let me know.

This specific file is only needed when image_set="train_noval", but right now it is being downloaded unconditionally. What we can do as a temporary measure is to only download it when image_set="train_noval", this way image_set="train" and image_set="val" should still work.

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The train_noval.txt file has been remade available by Bharath so that the URL https://www.cs.cornell.edu/~bharathh/train_noval.txt now allows to download this file.

So the first thing we can plan to do is to replace the train_noval.txt url by https://www.cs.cornell.edu/~bharathh/train_noval.txt

Unfortunately, this is not yet the end of the story. The script now fails at L79 with download_and_extract_archive(self.url, self.root, filename=self.filename, md5=self.md5) because the URL https://www2.eecs.berkeley.edu/Research/Projects/CS/vision/grouping/semantic_contours/benchmark.tgz leads to a 404.

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