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Fix k2 build topo helper #6887

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merged 2 commits into from
Jun 20, 2023
Merged

Fix k2 build topo helper #6887

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6a8c73f
Fix k2 build topo helper: reassign modified labels attribute
artbataev Jun 20, 2023
40e241c
Prettify code
artbataev Jun 20, 2023
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8 changes: 5 additions & 3 deletions nemo/collections/asr/parts/k2/topologies.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,9 +46,11 @@ def build_topo(name: str, tokens: List[int], blank_num: int, with_self_loops: bo
else:
raise ValueError(f"Unknown topo name: {name}")
if blank_num != 0:
blank_mask = ans.labels == 0
ans.labels[(ans.labels != -1) & (ans.labels <= blank_num)] -= 1
ans.labels[blank_mask] = blank_num
labels = ans.labels
blank_mask = labels == 0
labels[(labels != -1) & (labels <= blank_num)] -= 1
labels[blank_mask] = blank_num
ans.labels = labels # force update ans.labels property to notify FSA about modifications, required by k2
ans = k2.arc_sort(ans)
return ans

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