zhengruifeng opened a new pull request, #58627:
URL: https://github.com/apache/spark/pull/58627
### What changes were proposed in this pull request?
Broadcast only the word-index map and flattened word-vector array used by
`Word2VecModel.transform`, instead of broadcasting the legacy MLlib
`Word2VecModel` instance.
### Why are the changes needed?
The legacy model also contains derived fields used by synonym lookup,
including lazy caches that
may already have been initialized. These fields are not needed when
transforming sentences, but
they become part of the broadcast when the whole model is serialized.
Broadcasting the two lookup
structures directly keeps the payload limited to the state used by the
transform UDF.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Ran:
```
JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64 build/sbt \
'mllib/testOnly org.apache.spark.ml.feature.Word2VecSuite'
```
All 10 tests passed.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: OpenAI Codex (GPT-5)
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