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From Simone Robutti <simone.robu...@radicalbit.io>
Subject Re: env.fromElements produces TypeInformation error
Date Sat, 04 Jun 2016 17:38:42 GMT
I'm not sure if this is the solution and I don't have the possibility to
try right now, but you should move the case class "State" definition
outside the abstract class.

2016-06-04 17:34 GMT+02:00 Dan Drewes <drewes@campus.tu-berlin.de>:

>
> Hi,
>
> compiling the code:
>
> def minimize(f: DF, init: T): T = {
>
>   //create execution environment  val env = ExecutionEnvironment.getExecutionEnvironment
>
>   val initialstate = initialState(f, init)
>   val iterativestate= env.fromElements(initialstate).iterate(10000) {
>     iterationInput: DataSet[State] =>
>       val result = iterationInput.map {
>         oldstate => computeNextState(adjustedFun, oldstate)
>       }
>       result
>   }
> }
>
> object IterationsFirstOrderMinimizer {  case class State[+T, +ConvergenceInfo, +History]
(x: T,
>                                                    value: Double, grad: T,
>                                                    adjustedValue: Double, adjustedGradient:
T,
>                                                    iter: Int,
>                                                    initialAdjVal: Double,
>                                                    history: History,
>                                                    convergenceInfo: ConvergenceInfo,
>                                                    searchFailed: Boolean = false) {
>   }
>
> ... fails with the error: could not find implicit value for evidence
> parameter of type
> org.apache.flink.api.common.typeinfo.TypeInformation[IterationsFirstOrderMinimizer.this.State]
>     val iterativestate= env.fromElements(initialState(f,
> init)).iterate(10000) {                                         ^ Google
> only told me to import org.apache.flink.api.scala._     which i do. The
> other suggested solution for generic methods (
> https://ci.apache.org/projects/flink/flink-docs-master/internals/types_serialization.html)
> does also not apply because it's the fromElements call that produces the
> error. I am very new to Flink and Scala and because I don't know if the
> code I posted above is enough to say what I'm doing wrong, you can find the
> complete scala file attached. Thanks in advance for any ideas and hints.
> Best, Dan
>
>
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