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[8.16] [ML] Fix deberta tokenizer bug caused by bug in normalizer (#117189) #117256

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[8.16] [ML] Fix deberta tokenizer bug caused by bug in normalizer (#117189) #117256

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5 changes: 5 additions & 0 deletions docs/changelog/117189.yaml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
pr: 117189
summary: Fix deberta tokenizer bug caused by bug in normalizer
area: Machine Learning
type: bug
issues: []
2 changes: 1 addition & 1 deletion ...ava/org/elasticsearch/xpack/ml/inference/nlp/tokenizers/PrecompiledCharMapNormalizer.java
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Expand Up @@ -194,7 +194,7 @@ Reader normalize(CharSequence str) {
if (charDelta < 0) {
// normalised form is shorter
int lastDiff = getLastCumulativeDiff();
addOffCorrectMap(normalizedCharPos, lastDiff + charDelta);
addOffCorrectMap(normalizedCharPos, lastDiff - charDelta);
} else if (charDelta > 0) {
// inserted chars, add the offset in the output stream
int lastDiff = getLastCumulativeDiff();
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14 changes: 14 additions & 0 deletions ...est/java/org/elasticsearch/xpack/ml/inference/nlp/tokenizers/DebertaV2TokenizerTests.java
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Expand Up @@ -94,6 +94,20 @@ public void testTokenize() throws IOException {
}
}

public void testTokenizeWithHiddenControlCharacters() throws IOException {
try (
DebertaV2Tokenizer tokenizer = DebertaV2Tokenizer.builder(
TEST_CASE_VOCAB,
TEST_CASE_SCORES,
new DebertaV2Tokenization(false, false, null, Tokenization.Truncate.NONE, -1)
).build()
) {
TokenizationResult.Tokens tokenization = tokenizer.tokenize("\u009F\u008Fz", Tokenization.Truncate.NONE, -1, 0, null).get(0);
assertThat(tokenStrings(tokenization.tokens().get(0)), contains("▁", "z"));

}
}

public void testSurrogatePair() throws IOException {
try (
DebertaV2Tokenizer tokenizer = DebertaV2Tokenizer.builder(
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