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Fix nbest decoding for online partial lattice #1280

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Apr 23, 2024
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Fix nbest decoding for online partial lattice #1280

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5 changes: 5 additions & 0 deletions k2/csrc/intersect_dense_pruned.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -381,6 +381,11 @@ class MultiGraphDenseIntersectPruned {
ArcInfo old_ai = arcs_data[old_idx012];
// Only 1 state (the final state) in next frame, so idx1 is always 0.
old_ai.u.dest_info_state_idx1 = 0;
// The final arcs we are adding for online decoding partial should not
// map to any real arc in a_fsas.
// We add these final arcs for the purpose of making the partial lattice
// a valid Fsa.
old_ai.a_fsas_arc_idx012 = -1;
new_arcs_data[new_idx012] = old_ai;
});

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