Backport fix `dr.backward_from` and `dr.forward_from` on special types

mitsuba-renderer / drjit

Dr.Jit — A Just-In-Time-Compiler for Differentiable Rendering

BSD 3-Clause "New" or "Revised" License

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Closed rtabbara closed 1 month ago

rtabbara commented 1 month ago

This was fixed in prior Dr.Jit release (PR #172). Need to ensure gradients are correctly initialized for all components