Given two separately refcounted objects, how can you arrange for each of them to stay live so long as the other is live? Why doesn't just having a strong-strong or strong-weak reference between the two objects work? What is object resurrection in CPython? What's a finalizer and why does it make things more complicated? How does Python GC work?Further reading.<ul><li>PyObject preservation PR <a href="https://github.com/pytorch/pytorch/pull/56017">https://github.com/pytorch/pytorch/pull/56017</a></li><li>Sam Gross's original PoC, which works fine if the two objects in question are both PyObjects <a href="https://github.com/colesbury/refcount/">https://github.com/colesbury/refcount/</a></li><li>PEP 442 Safe object finalization <a href="https://www.python.org/dev/peps/pep-0442/">https://www.python.org/dev/peps/pep-0442/</a></li><li>Essential reading about Python GC <a href="https://devguide.python.org/garbage_collector/">https://devguide.python.org/garbage_collector/</a></li></ul>

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The PyTorch Developer Podcast is a place for the PyTorch dev team to do bite sized (10-20 min) topics about all sorts of internal development topics in PyTorch.