Github user keypointt commented on the issue:
https://github.com/apache/spark/pull/14447
hi @mengxr , could you please tell me how to debug R wrapper? Thanks a lot
I tried to read documentation and google, but cannot figure it out myself.
From SparkR console, the error message is too vague as below, and I tried to
`tail -f` spark logs but no error messages, and also I tried to create a
`RWrapperSuite` but the class is private and cannot be accessed.
```
> model <- spark.mlp(irisDF, ~ Sepal_Length + Sepal_Width + Petal_Length +
Petal_Width, blockSize=128, initialWeights=seq(1, 9, by = 2), layers=3,
solver='LBFGS', seed=1234L, maxIter=100, tol=0.5, stepSize=1)
16/08/01 17:16:38 ERROR RBackendHandler: fit on
org.apache.spark.ml.r.MultilayerPerceptronClassifierWrapper failed
Error in invokeJava(isStatic = TRUE, className, methodName, ...) :
In addition: Warning message:
In if (is.na(object)) { :
the condition has length > 1 and only the first element will be used
```
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