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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
7735 changed files with 38060 additions and 199180 deletions
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60
Task/Diversity-prediction-theorem/Ada/diversity-prediction-theorem.ada
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with Ada.Text_IO;
with Ada.Command_Line;
procedure Diversity_Prediction is
type Real is new Float;
type Real_Array is array (Positive range <>) of Real;
package Real_IO is new Ada.Text_Io.Float_IO (Real);
use Ada.Text_IO, Ada.Command_Line, Real_IO;
function Mean (Data : Real_Array) return Real is
Sum : Real := 0.0;
begin
for V of Data loop
Sum := Sum + V;
end loop;
return Sum / Real (Data'Length);
end Mean;
function Variance (Reference : Real; Data : Real_Array) return Real is
Res : Real_Array (Data'Range);
begin
for A in Data'Range loop
Res (A) := (Reference - Data (A)) ** 2;
end loop;
return Mean (Res);
end Variance;
procedure Diversity (Truth : Real; Estimates : Real_Array)
is
Average : constant Real := Mean (Estimates);
Average_Error : constant Real := Variance (Truth, Estimates);
Crowd_Error : constant Real := (Truth - Average) ** 2;
Diversity : constant Real := Variance (Average, Estimates);
begin
Real_IO.Default_Exp := 0;
Real_IO.Default_Aft := 5;
Put ("average-error : "); Put (Average_Error); New_Line;
Put ("crowd-error : "); Put (Crowd_Error); New_Line;
Put ("diversity : "); Put (Diversity); New_Line;
end Diversity;
begin
if Argument_Count <= 1 then
Put_Line ("Usage: diversity_prediction <truth> <data_1> <data_2> ...");
return;
end if;
declare
Truth : constant Real := Real'Value (Argument (1));
Estimates : Real_Array (2 .. Argument_Count);
begin
for A in 2 .. Argument_Count loop
Estimates (A) := Real'Value (Argument (A));
end loop;
Diversity (Truth, Estimates);
end;
end Diversity_Prediction;