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Posted to reviews@spark.apache.org by "zhengruifeng (via GitHub)" <gi...@apache.org> on 2026/09/10 05:44:21 UTC
[PR] [SPARK-59397][ML] Reduce serialized size of mllib Word2VecModel [spark]
zhengruifeng opened a new pull request, #58688:
URL: https://github.com/apache/spark/pull/58688
### What changes were proposed in this pull request?
This PR reduces the serialized size of `mllib`'s `Word2VecModel` by:
- computing `numWords` and `vectorSize` from the model data instead of storing them;
- removing the derived `wordList` cache and iterating over `wordIndex` when finding synonyms;
- making the lazily computed word-vector inverse norms transient.
### Why are the changes needed?
These values are derived from `wordIndex` and `wordVectors`. Storing them in the serialized model
duplicates data, including an array containing the full vocabulary, and increases the pressure from
shipping models between the Spark Connect server and executors.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Existing Word2Vec tests:
```
build/sbt 'mllib/testOnly *Word2VecSuite'
```
The run passed 19 tests with no failures. No new tests were added because this is an internal
representation refactor covered by the existing synonym, Java API, and model persistence tests.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: OpenAI Codex (GPT-5)
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Re: [PR] [SPARK-59397][ML] Reduce serialized size of mllib Word2VecModel [spark]
Posted by "zhengruifeng (via GitHub)" <gi...@apache.org>.
zhengruifeng commented on PR #58688:
URL: https://github.com/apache/spark/pull/58688#issuecomment-5616715117
**Merge Summary:**
- merged into master https://github.com/apache/spark/commit/505aff3786d0cf5bc17f574468da22e2eb9503e0
- merged into branch-4.x https://github.com/apache/spark/commit/29eed0a08afc1e75ee52ce4d8b5fc83d1c70dd09
*Posted by `merge_spark_pr.py`*
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Re: [PR] [SPARK-59397][ML] Reduce serialized size of mllib Word2VecModel [spark]
Posted by "zhengruifeng (via GitHub)" <gi...@apache.org>.
zhengruifeng closed pull request #58688: [SPARK-59397][ML] Reduce serialized size of mllib Word2VecModel
URL: https://github.com/apache/spark/pull/58688
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