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[fsmt] deal with -100 indices in decoder ids #18592

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Aug 12, 2022
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[fsmt] deal with -100 indices in decoder ids #18592

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[fsmt] deal with -100 indices in decoder ids
stas00 Aug 12, 2022
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stas00 Aug 12, 2022
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4 changes: 4 additions & 0 deletions src/transformers/models/fsmt/modeling_fsmt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -372,6 +372,10 @@ def _check_shapes(shape_1, shape2):

def shift_tokens_right(input_ids, pad_token_id):
"""Shift input ids one token to the right, and wrap the last non pad token (usually <eos>)."""

# replace possible -100 values in labels by `pad_token_id`
input_ids.masked_fill_(input_ids == -100, pad_token_id)

prev_output_tokens = input_ids.clone()
index_of_eos = (input_ids.ne(pad_token_id).sum(dim=1) - 1).unsqueeze(-1)
prev_output_tokens[:, 0] = input_ids.gather(1, index_of_eos).squeeze()
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