Github user felixcheung commented on a diff in the pull request:
    --- Diff: R/pkg/R/mllib.R ---
    @@ -695,17 +695,15 @@ setMethod("predict", signature(object = 
     #' @note spark.mlp since 2.1.0
     setMethod("spark.mlp", signature(data = "SparkDataFrame"),
               function(data, layers, blockSize = 128, solver = "l-bfgs", 
maxIter = 100,
    -                   tol = 1E-6, stepSize = 0.03, seed = 0x7FFFFFFF) {
    +                   tol = 1E-6, stepSize = 0.03, seed = "") {
    --- End diff --
    this is a bit unusual in R, also could cause confusion as to what should be 
passed in (string? integer?) - how about we default to NULL and then check 
inside spark.mlp to map seed NULL to "" (only that)?
    also if seed is not NULL it should be coerce into integer (as.integer(seed))

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