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 <dre...@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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