Re: Spark ML Pipeline inaccessible types
Thanks Peter,
I ended up doing something similar. I however consider both the approaches
you mentioned bad practices which is why I was looking for a solution
directly supported by the current code.
I can work with that now, but it does not seem to be the proper solution.
Regards,
Martin
-- Původní zpráva --
Od: Peter Rudenko petro.rude...@gmail.com
Komu: zapletal-mar...@email.cz, Sean Owen so...@cloudera.com
Datum: 25. 3. 2015 13:28:38
Předmět: Re: Spark ML Pipeline inaccessible types
Hi Martin, here’s 2 possibilities to overcome this:
1) Put your logic into org.apache.spark package in your project - then
everything would be accessible.
2) Dirty trick:
spanspanobject/span spanSparkVector/span
spanspanextends/span/span spanHashingTF/span {/span
spanspanval/span spanVectorUDT/span:/span spanDataType/span =
outputDataType
}
then you can do like this:
spanStructType/span(spanvectorTypeColumn/span,
spanSparkVector/span.spanVectorUDT/span, spanfalse/span))
Thanks,
Peter Rudenko
On 2015-03-25 13:14, zapletal-mar...@email.cz
(mailto:zapletal-mar...@email.cz) wrote:
Sean,
thanks for your response. I am familiar with NoSuchMethodException in
general, but I think it is not the case this time. The code actually
attempts to get parameter by name using val m = this.getClass.getMethodName
(paramName).
This may be a bug, but it is only a side effect caused by the real problem I
am facing. My issue is that VectorUDT is not accessible by user code and
therefore it is not possible to use custom ML pipeline with the existing
Predictors (see the last two paragraphs in my first email).
Best Regards,
Martin
-- Původní zpráva --
Od: Sean Owen so...@cloudera.com(mailto:so...@cloudera.com)
Komu: zapletal-mar...@email.cz(mailto:zapletal-mar...@email.cz)
Datum: 25. 3. 2015 11:05:54
Předmět: Re: Spark ML Pipeline inaccessible types
NoSuchMethodError in general means that your runtime and compile-time
environments are different. I think you need to first make sure you
don't have mismatching versions of Spark.
On Wed, Mar 25, 2015 at 11:00 AM, zapletal-mar...@email.cz
(mailto:zapletal-mar...@email.cz) wrote:
Hi,
I have started implementing a machine learning pipeline using Spark 1.3.0
and the new pipelining API and DataFrames. I got to a point where I have
my
training data set prepared using a sequence of Transformers, but I am
struggling to actually train a model and use it for predictions.
I am getting a java.lang.NoSuchMethodException:
org.apache.spark.ml.regression.LinearRegression.myFeaturesColumnName()
exception thrown at checkInputColumn method in Params trait when using a
Predictor (LinearRegression in my case, but that should not matter). This
looks like a bug - the exception is thrown when executing getParam
(colName)
when the require(actualDataType.equals(datatype), ...) requirement is not
met so the expected requirement failed exception is not thrown and is
hidden
by the unexpected NoSuchMethodException instead. I can raise a bug if this
really is an issue and I am not using something incorrectly.
The problem I am facing however is that the Predictor expects features to
have VectorUDT type as defined in Predictor class (protected def
featuresDataType: DataType = new VectorUDT). But since this type is
private[spark] my Transformer can not prepare features with this type
which
then correctly results in the exception above when I use a different type.
Is there a way to define a custom Pipeline that would be able to use the
existing Predictors without having to bypass the access modifiers or
reimplement something or is the pipelining API not yet expected to be used
in this way?
Thanks,
Martin
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Re: Spark ML Pipeline inaccessible types
Sean, thanks for your response. I am familiar with NoSuchMethodException in general, but I think it is not the case this time. The code actually attempts to get parameter by name using val m = this.getClass.getMethodName (paramName). This may be a bug, but it is only a side effect caused by the real problem I am facing. My issue is that VectorUDT is not accessible by user code and therefore it is not possible to use custom ML pipeline with the existing Predictors (see the last two paragraphs in my first email). Best Regards, Martin -- Původní zpráva -- Od: Sean Owen so...@cloudera.com Komu: zapletal-mar...@email.cz Datum: 25. 3. 2015 11:05:54 Předmět: Re: Spark ML Pipeline inaccessible types NoSuchMethodError in general means that your runtime and compile-time environments are different. I think you need to first make sure you don't have mismatching versions of Spark. On Wed, Mar 25, 2015 at 11:00 AM, zapletal-mar...@email.cz wrote: Hi, I have started implementing a machine learning pipeline using Spark 1.3.0 and the new pipelining API and DataFrames. I got to a point where I have my training data set prepared using a sequence of Transformers, but I am struggling to actually train a model and use it for predictions. I am getting a java.lang.NoSuchMethodException: org.apache.spark.ml.regression.LinearRegression.myFeaturesColumnName() exception thrown at checkInputColumn method in Params trait when using a Predictor (LinearRegression in my case, but that should not matter). This looks like a bug - the exception is thrown when executing getParam (colName) when the require(actualDataType.equals(datatype), ...) requirement is not met so the expected requirement failed exception is not thrown and is hidden by the unexpected NoSuchMethodException instead. I can raise a bug if this really is an issue and I am not using something incorrectly. The problem I am facing however is that the Predictor expects features to have VectorUDT type as defined in Predictor class (protected def featuresDataType: DataType = new VectorUDT). But since this type is private[spark] my Transformer can not prepare features with this type which then correctly results in the exception above when I use a different type. Is there a way to define a custom Pipeline that would be able to use the existing Predictors without having to bypass the access modifiers or reimplement something or is the pipelining API not yet expected to be used in this way? Thanks, Martin - To unsubscribe, e-mail: user-unsubscr...@spark.apache.org For additional commands, e-mail: user-h...@spark.apache.org
Spark ML Pipeline inaccessible types
Hi, I have started implementing a machine learning pipeline using Spark 1.3.0 and the new pipelining API and DataFrames. I got to a point where I have my training data set prepared using a sequence of Transformers, but I am struggling to actually train a model and use it for predictions. I am getting a java.lang.NoSuchMethodException: org.apache.spark.ml. regression.LinearRegression.myFeaturesColumnName() exception thrown at checkInputColumn method in Params trait when using a Predictor ( LinearRegression in my case, but that should not matter). This looks like a bug - the exception is thrown when executing getParam(colName) when the require(actualDataType.equals(datatype), ...) requirement is not met so the expected requirement failed exception is not thrown and is hidden by the unexpected NoSuchMethodException instead. I can raise a bug if this really is an issue and I am not using something incorrectly. The problem I am facing however is that the Predictor expects features to have VectorUDT type as defined in Predictor class (protected def featuresDataType: DataType = new VectorUDT). But since this type is private [spark] my Transformer can not prepare features with this type which then correctly results in the exception above when I use a different type. Is there a way to define a custom Pipeline that would be able to use the existing Predictors without having to bypass the access modifiers or reimplement something or is the pipelining API not yet expected to be used in this way? Thanks, Martin
