title: Unable to load model trained on Pytotch version 1.6.0 in Pytorch version 1.5.1
body: <p>I have recently updated my Pytorch version to <code>1.6.0</code> on my local machine to use their mixed-precision training, since then I am encountering this issue, I have tried the solution mentioned <a href="https://www.kaggle.com/c/tweet-sentiment-extraction/discussion/157695#886125" rel="noreferrer">here</a>, but it is still throwing below error.</p>
  <pre><code>RuntimeError: version_ &lt;= kMaxSupportedFileFormatVersion INTERNAL ASSERT FAILED at /opt/conda/conda-bld/pytorch_1591914880026/work/caffe2/serialize/inline_container.cc:132, please report a bug to PyTorch. Attempted to read a PyTorch file with version 4, but the maximum supported version for reading is 3. Your PyTorch installation may be too old.
  
  </code></pre>
  <p>Link to reproduce: <a href="https://www.kaggle.com/rohitsingh9990/error-reproducing-code?scriptVersionId=37468859" rel="noreferrer">https://www.kaggle.com/rohitsingh9990/error-reproducing-code?scriptVersionId=37468859</a></p>
  <p>Any help will be appreciated, thanks in advance.</p>