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https://issues.apache.org/jira/browse/SPARK-9003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yanbo Liang updated SPARK-9003:
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Description:
MLlib/Vector only support foreachActive function and is short of map/update
which is inconvenience for some Vector operations.
For example:
val a = Vectors.dense(...)
If we want to compute math.log for each elements of a and get Vector as return
value, we can only code as:
val b = Vectors.dense(a.toArray.map(math.log))
or we can use "toBreeze" and make transformation with breeze API.
The code snippet is not elegant, we want it can implement:
val c = a.map(math.log)
Also currently MLlib/Matrix has implemented map/update/foreachActive function.
I think Vector should also has map/update.
was:
MLlib/Vector only support foreachActive function and is short of map/update
which is inconvenience for some Vector operations.
For example:
val a = Vectors.dense(...)
If we want to compute math.log for each elements of a and get Vector as return
value, we can only code as:
val b = Vectors.dense(a.toArray.map(math.log))
The code snippet is not elegant, we want it can implement:
val c = a.map(math.log)
Also currently MLlib/Matrix has implemented map/update/foreachActive function.
I think Vector should also has map/update.
> Add map/update function to MLlib/Vector
> ---------------------------------------
>
> Key: SPARK-9003
> URL: https://issues.apache.org/jira/browse/SPARK-9003
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Yanbo Liang
> Priority: Minor
>
> MLlib/Vector only support foreachActive function and is short of map/update
> which is inconvenience for some Vector operations.
> For example:
> val a = Vectors.dense(...)
> If we want to compute math.log for each elements of a and get Vector as
> return value, we can only code as:
> val b = Vectors.dense(a.toArray.map(math.log))
> or we can use "toBreeze" and make transformation with breeze API.
> The code snippet is not elegant, we want it can implement:
> val c = a.map(math.log)
> Also currently MLlib/Matrix has implemented map/update/foreachActive
> function. I think Vector should also has map/update.
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