sig
type input
type key
type value
type output
val compare_keys :
MapReduce.Computation.key -> MapReduce.Computation.key -> int
val map :
MapReduce.Computation.input ->
(MapReduce.Computation.key * MapReduce.Computation.value) list
val combine :
MapReduce.Computation.key ->
MapReduce.Computation.value ->
MapReduce.Computation.value -> MapReduce.Computation.value
val reduce :
MapReduce.Computation.key ->
MapReduce.Computation.value ->
MapReduce.Computation.output -> MapReduce.Computation.output
end