GitHub user MLnick opened a pull request:
https://github.com/apache/spark/pull/12762
[SPARK-14891][ML] Add schema validation for ALS
This PR adds schema validation to `ml`'s ALS and ALSModel. Currently, no
schema validation was performed as `transformSchema` was never called in
`ALS.fit` or `ALSModel.transform`. Furthermore, due to no schema validation, if
users passed in Long (or Float etc) ids, they would be silently cast to Int
with no warning or error thrown.
With this PR, ALS now supports all numeric types for `user`, `item`, and
`rating` columns. The rating column is cast to `Float` and the user and item
cols are cast to `Int` (as is the case currently) - however for user/item, the
cast throws an error if the value is outside integer range. Behavior for rating
col is unchanged (as it is not an issue).
## How was this patch tested?
New test cases in `ALSSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/MLnick/spark SPARK-14891-als-validate-schema
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12762.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #12762
----
commit c21d5a0afd756a023c8f1e85018f9438cdff3ad6
Author: Nick Pentreath <[email protected]>
Date: 2016-04-28T11:49:16Z
Intial work
commit e5860cd08a18b93abecd9bbc786316517629ec91
Author: Nick Pentreath <[email protected]>
Date: 2016-04-28T13:47:45Z
Improve tests and add transform test cases + small cleanup
commit c5f3e1a095dd80add219848f92d3c2b7667fbaa3
Author: Nick Pentreath <[email protected]>
Date: 2016-04-28T14:12:54Z
revert small erroneous addition
commit 73ea0b62f1c0ae6a9897ec83f5c8dfedea86f3f9
Author: Nick Pentreath <[email protected]>
Date: 2016-04-28T18:47:41Z
user/item col param docs
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