Using `RTMB:::Term` and sparse_hessian_compress together

[James-Thorson-NOAA]

It appears that RTMB:::Term(.) calls RTMB:::getPositiveHessian, which scans the tape for "TermOp1" operations. However, when using TMB::config( tmbad.sparse_hessian_compress = TRUE, DLL="RTMB" ) to compress the Hessian (i.e., save memory), it then labels the repeated elements as atomic functions, so RTMB:::getPositiveHessian no longer works.

Is there any way to call the machinery of tmbad.sparse_hessian_compress on a built tape, i.e., after executing RTMB:::getPositiveHessian, so that these two features could be done together on the same model?

[kaskr]

I can confirm that the two features do not work when combined, and it's not easy to fix (although it might be if the memory explosion comes from terms that are not marked with Term()). Leaving this open.