val make : measures:float array -> labels:string array -> float -> tmake ~measures ~labels run is samples of one record of run runs. labels.(i) is associated to measures.(i).
val run : t -> floatrun t is the number of runs of t.
val get_index : label:string -> t -> intget_index ~label t is the index of the measure identified by label.
val get : label:string -> t -> floatget ~label t is the recorded measure label into t.
val exists : label:string -> t -> boolexists ~label t returns true if the measure label exists into t. Otherwise, it returns false.