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From "Sean Owen (JIRA)" <>
Subject [jira] [Commented] (SPARK-9003) Add map/update function to MLlib/Vector
Date Sun, 12 Jul 2015 08:07:04 GMT


Sean Owen commented on SPARK-9003:

I think the idea was that this is not supposed to become yet another vector/matrix library,
and that you can manipulate the underlying breeze vector if needed. I don't know how strong
that convention is. The use case you show doesn't really benefit except for maybe saving a
method call; is there a case where this would be a bigger win?

> Add map/update function to MLlib/Vector
> ---------------------------------------
>                 Key: SPARK-9003
>                 URL:
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Yanbo Liang
>            Priority: Minor
> MLlib/Vector is short of map/update function 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(
> The code snippet is not elegant, we want it can implement:
> val c =
> Also currently MLlib/Matrix has implemented map/update function. I think Vector should
also has map/update.

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