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[GitHub] [spark] ozancicek opened a new pull request #24939: [SPARK-18569][ML][R] Support RFormula arithmetic, I() and spark functions
ozancicek opened a new pull request #24939:
URL: https://github.com/apache/spark/pull/24939
## What changes were proposed in this pull request?
Added support for arithmetic expressions, use of spark functions and registered udf's inside formula so that expressions like this work as intended in `RFormula`;
`log(y) ~ a + pow(b, 2)` -> `log()` and `pow()` spark functions are used on `y` and `b`
`I(y +b) ~ a + x` -> The label term is sum of `y` and `b`
Udf's can also be used once they're registered:
```scala
val registeredUdf = spark.udf.register("plusTwo", (x: Int) => (x + 2))
val formula = new RFormula()
.setFormula("plusTwo(y) ~ a + plusTwo(b)")
val df = Seq((1, 4, 4), (2, 5, 6)).toDF("y", "a", "b")
val model = formula.fit(df)
model.transform(df).show()
+---+---+---+---------+-----+
| y| a| b| features|label|
+---+---+---+---------+-----+
| 1| 4| 4|[4.0,6.0]| 3.0|
| 2| 5| 6|[5.0,8.0]| 4.0|
+---+---+---+---------+-----+
```
Summary of changes:
- Added `EvalExprParser` trait for parsing arithmetic expressions inside formula
- Added `ExprSelector` transformer which adds columns to a dataframe using `expr` spark function
- Add `ExprSelector` and `ColumnPruner` stages for parsed arithmetic expressions.
The criteria for parsing a term as arithmetic expression is that it's inside 'I(' expression ')', or it's a function (function criteria is ascii chars + alphanumeric chars + '(' args ')' ). From parsed arithmetic expressions, features are generated using `expr` spark function, so anything that can be used with `expr` function should be valid. Due to many ways `expr` function can be used, whether the expression has a valid syntax or whether the function is defined or not is not checked, only parsing rule is balanced parentheses.
## How was this patch tested?
Unit tests to RFormulaParserSuite and RFormulaSuite
@srowen @felixcheung
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[GitHub] [spark] github-actions[bot] closed pull request #24939: [SPARK-18569][ML][R] Support RFormula arithmetic, I() and spark functions
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[GitHub] [spark] HyukjinKwon commented on pull request #24939: [SPARK-18569][ML][R] Support RFormula arithmetic, I() and spark functions
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cc @mengxr and @ericl. cc @shivaram too.
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retest this please
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retest this please
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* This patch **fails due to an unknown error code, -9**.
* This patch merges cleanly.
* This patch adds no public classes.
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We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
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We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and ask a committer to remove the Stale tag!
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