module Make: functor (C : Computation) -> S with type input = C.input and type output = C.output 
Builds a map/reduce implementation for the passed computation.
type input 
The type of input values.
 
 
type output 
The type of output values.
 
 
val compute : ThreadPoolExecutor.t ->
       input Stream.t -> output -> output
Iterates over the passed stream using pool threads to execute
      map operations over the various input values, and applies
      combine operation over values having identical keys as soon as
      they are available.
      Then, folds over key/value couple through the reduce operation,
      using the third parameter as the inital value.