[SPARK-14644][ML][PYSPARK] Turn Binary param into a shared param

[holdenk]

What changes were proposed in this pull request?

Change the binary param into a shared param.

How was this patch tested?

Existing unit tests

[SparkQA]

Test build #55872 has finished for PR 12404 at commit edbd652.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class CountVectorizer(JavaEstimator, HasBinary, HasInputCol, HasOutputCol, JavaMLReadable,
  • class HashingTF(JavaTransformer, HasBinary, HasInputCol, HasOutputCol, HasNumFeatures,

[rxin]

how come this didn't fail our style checker? did we break the pep8 checker?

[holdenk]

From toxi.ini we've excluded cloudpickle.py,heapq3.py, and shared.py, we've also done similar exclusions on the Scala side for the auto generated params.

[MLnick]

Hey @holdenk, in #12079 (comment) and #12308 (comment), we decided to keep them separate for now, since the doc for binary in CountVectorizer mentions that the binarization occurs after minTF is applied. In HashingTF this doesn't apply as there is no minTF parameter.

So unless we can easily have different doc string, I think it might be best to not separate out binary into a shared param yet. We could look at adding minTF semantics to hashingTF, in which case it would then make a lot of sense to have this as a shared param.

[holdenk]

So I thought the unified doc string of:

If true, all non zero results are set to 1. This is useful for discrete probabilistic models that model binary events rather than integer counts. Default False.

might make sense in the two cases where we are using it (since minTF is described as a filter). If you think this isn't clear enough with the minTF case on HashingTF I'm happy to close it for now and revisit if we add minTF to CountVectorizer.

[MLnick]

ah - sorry I missed that. Ok, yeah this makes sense if we unify the doc string appropriately. Perhaps something like If true, all non-zero counts (after any filters are applied) ...?

[holdenk]

Sure that sounds like a clearer docstring :)

[jkbradley]

I prefer to keep them separate. There isn't much benefit to combining 2 instances, and the doc becomes a bit less clear.

[MLnick]

Fair enough. We can revisit if more estimators use the param, or if we add
minTF to HashingTF.
On Fri, 15 Apr 2016 at 22:54, jkbradley notifications@github.com wrote:

I prefer to keep them separate. There isn't much benefit to combining 2
instances, and the doc becomes a bit less clear.

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#12404 (comment)

[holdenk]

Sounds good if people prefer to keep them separate I'll close this out.

[SparkQA]

Test build #55961 has finished for PR 12404 at commit b702e72.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.