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Fix topp sampling issues #882

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Fix topp sampling issues #882

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3 changes: 2 additions & 1 deletion fairseq/search.py
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Original file line number Diff line number Diff line change
Expand Up @@ -202,7 +202,8 @@ def _sample_topp(self, lprobs):
# note that mask was computed by 'lt'. One more word needs to be included
# so that the cumulative probability mass can exceed p.
cumsum_mask = mask.cumsum(dim=2)
last_included = cumsum_mask[:, :, :1]
last_included = cumsum_mask[:, :, -1:]
last_included.clamp_(0, mask.size()[2] - 1)
mask = mask.scatter_(2, last_included, 1)

# truncate unnecessary dims.
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