What's wrong with this data_loder?

rui_zhou: <p><div class="lightbox-wrapper"><a class="lightbox" href="https://discuss.pytorch.org/uploads/default/original/3X/8/8/88d7f7a082d5686b270fd10a3fde3513811fc112.png" data-download-href="https://discuss.pytorch.org/uploads/default/88d7f7a082d5686b270fd10a3fde3513811fc112" title="bug13"><img src="https://discuss.pytorch.org/uploads/default/optimized/3X/8/8/88d7f7a082d5686b270fd10a3fde3513811fc112_2_690x264.png" alt="bug13" data-base62-sha1="jwzDUEWWbt0fpXHIafiEEnmD5nA" width="690" height="264" srcset="https://discuss.pytorch.org/uploads/default/optimized/3X/8/8/88d7f7a082d5686b270fd10a3fde3513811fc112_2_690x264.png, https://discuss.pytorch.org/uploads/default/optimized/3X/8/8/88d7f7a082d5686b270fd10a3fde3513811fc112_2_1035x396.png 1.5x, https://discuss.pytorch.org/uploads/default/original/3X/8/8/88d7f7a082d5686b270fd10a3fde3513811fc112.png 2x" data-dominant-color="F1F0F0"><div class="meta"><svg class="fa d-icon d-icon-far-image svg-icon" aria-hidden="true"><use href="#far-image"></use></svg><span class="filename">bug13</span><span class="informations">1051×403 46.5 KB</span><svg class="fa d-icon d-icon-discourse-expand svg-icon" aria-hidden="true"><use href="#discourse-expand"></use></svg></div></a></div> <img src="https://discuss.pytorch.org/uploads/default/original/3X/a/f/afae1ff9bcc7e390dd9c507b34c5615f6d90cf6f.png" alt="bug12" data-base62-sha1="p48Ckq8wSnFyRaPVxWwMffPYDHV" width="416" height="40"> <div class="lightbox-wrapper"><a class="lightbox" href="https://discuss.pytorch.org/uploads/default/original/3X/d/b/dbb89ddfa0639748d62ab7546165ec3798a36525.png" data-download-href="https://discuss.pytorch.org/uploads/default/dbb89ddfa0639748d62ab7546165ec3798a36525" title="bug11"><img src="https://discuss.pytorch.org/uploads/default/optimized/3X/d/b/dbb89ddfa0639748d62ab7546165ec3798a36525_2_690x221.png" alt="bug11" data-base62-sha1="vlK6xqsam59WgS5XDODsVgGyJj7" width="690" height="221" srcset="https://discuss.pytorch.org/uploads/default/optimized/3X/d/b/dbb89ddfa0639748d62ab7546165ec3798a36525_2_690x221.png, https://discuss.pytorch.org/uploads/default/optimized/3X/d/b/dbb89ddfa0639748d62ab7546165ec3798a36525_2_1035x331.png 1.5x, https://discuss.pytorch.org/uploads/default/original/3X/d/b/dbb89ddfa0639748d62ab7546165ec3798a36525.png 2x" data-dominant-color="F7F7F7"><div class="meta"><svg class="fa d-icon d-icon-far-image svg-icon" aria-hidden="true"><use href="#far-image"></use></svg><span class="filename">bug11</span><span class="informations">1099×353 40.6 KB</span><svg class="fa d-icon d-icon-discourse-expand svg-icon" aria-hidden="true"><use href="#discourse-expand"></use></svg></div></a></div><br>
what’s wrong with this data_loder?</p>

ptrblck: <p>It seems you might be using a 3rd party <code>DataLoader</code> implementation defined in <code>pytorch-deeplab-xception/dataloaders/__init__.py</code>, which raises the <code>NotImplementedError</code>, so should check this file and make sure this class is used as expected.</p>
<p>PS: you can post code snippets by wrapping them into three backticks ```, which makes debugging easier. <img src="https://discuss.pytorch.org/images/emoji/apple/wink.png?v=9" title=":wink:" class="emoji" alt=":wink:"></p>

rui_zhou: <p>Thanks a lot.<div class="lightbox-wrapper"><a class="lightbox" href="https://discuss.pytorch.org/uploads/default/original/3X/5/d/5df390320508cba1d504687cfeb07e676a2f445f.jpeg" data-download-href="https://discuss.pytorch.org/uploads/default/5df390320508cba1d504687cfeb07e676a2f445f" title="bug3"><img src="https://discuss.pytorch.org/uploads/default/optimized/3X/5/d/5df390320508cba1d504687cfeb07e676a2f445f_2_670x500.jpeg" alt="bug3" data-base62-sha1="dp8eFD7L8OCfQSPmcvyf2PZCTKv" width="670" height="500" srcset="https://discuss.pytorch.org/uploads/default/optimized/3X/5/d/5df390320508cba1d504687cfeb07e676a2f445f_2_670x500.jpeg, https://discuss.pytorch.org/uploads/default/optimized/3X/5/d/5df390320508cba1d504687cfeb07e676a2f445f_2_1005x750.jpeg 1.5x, https://discuss.pytorch.org/uploads/default/original/3X/5/d/5df390320508cba1d504687cfeb07e676a2f445f.jpeg 2x" data-dominant-color="F3F3F3"><div class="meta"><svg class="fa d-icon d-icon-far-image svg-icon" aria-hidden="true"><use href="#far-image"></use></svg><span class="filename">bug3</span><span class="informations">1113×830 80.2 KB</span><svg class="fa d-icon d-icon-discourse-expand svg-icon" aria-hidden="true"><use href="#discourse-expand"></use></svg></div></a></div> It’s this one, but why the data can not loaded in?</p>

ptrblck: <p>Could you post an executable code snippet, so that we could take a look, please?</p>