Zhe, there are way too many changes in this diff file for anyone to track and debug.
I suggest you start with a clean gr-trellis and change JUST one block (say the viterbi_combined) and see if this change propagates in python and grc as you expect. You can also post this change to the list for further feedback (together with the SIMPLEST possible grc example that indicates the problem.) best, Achilleas
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