Github user WeichenXu123 commented on the issue:
    Now I update the scala-side wapper args type as following:
    layers: Array[Int],
    seed: String
    and the seed default value currently I use "", not NULL, because the R-side 
args serializer cannot handle `as.character(NULL)` object correctly.
    another problem:
    how to test R code which contains `stop` activity ? I want to test a piece 
of R code to make sure it will call `stop` indeed.

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