text: Title: device-side assert triggered at /opt/conda/conda-bld/pytorch_1535493744281/work/aten/src/THC/generic/THCStorage.cpp:36
  Body: I use the training code supplied without changing.But it shows this error.
  I have found blogs for this error and known it mainly because the label computing loss may have  negative value.
  But I download the VID dataset in the official web and use the applied code to change it  to JSON.
  Why there is still this error ?