/// <summary>
/// 最急降下法で最適な位置を計算する
/// </summary>
/// <param name="currentTable"></param>
/// <param name="beforeRuleTable"></param>
/// <param name="afterRuleTable"></param>
/// <param name="changes"></param>
private void DescentMethod(IVRiscuitObjectSet currentTable, IVRiscuitObjectSet beforeTable, IVRiscuitObjectSet afterRuleTable, IVRiscuitObjectSet beforeRuleTable)
{
var limit = 100;
var beforeScore = 0.0f;
var beforec = new VRiscuitObjectSet(beforeTable);
var currentc = new VRiscuitObjectSet(currentTable);
var parameters = currentc.ToParameters();
var firstParam = currentc.ToParameters();
var beforeDelta = new float[parameters.Length];
Func <float[], float> func = delegate(float[] param)
{
(currentc as IVRiscuitObjectSet).SetParameter(param);
var scores = RuleManager.CalcAppliedFieldScore(currentc, beforec, afterRuleTable, beforeRuleTable, (this as IRule).RuleScoreCoefficient);
return(scores[0] / scores[1]);
};
var alpha = _paramLength;
var f = 0.001; // scoreの変動がこの値以下になったら終わり
for (int i = 0; i < limit; i++)
{
var score = func(parameters);
// var message = String.Format("{0}: {1}, {2}, {3}, {5}, {6}, {7} => {4} points", i, parameters[0], parameters[1], parameters[2], score, parameters[3], parameters[4], parameters[5]);
//Debug.Log(message);
// Debug.Log("alpha = " + alpha);
if (Mathf.Abs(beforeScore - score) <= f && i != 0)
{
// 終了
break;
}
beforeScore = score;
var delta = Differential(func, parameters);
delta = NormalizeArray(delta);
// deltaの中に0の要素があったら、beforeDeltaをもとに前回の変更を半分もとに戻す
// その場合次のbeforeDeltaは
// 同時にbeforeDeltaの更新
for (int di = 0; di < delta.Length; di++)
{
if (delta[di] == 0)
{
delta[di] = -(beforeDelta[di] / 2);
beforeDelta[di] /= 2;
}
else
{
beforeDelta[di] = delta[di];
}
}
// Debug.Log("delta = " + delta.Skip(1).Aggregate(delta[0].ToString(), (acc, next) => acc + ", " + next.ToString()));
for (int j = 0; j < parameters.Length; j++)
{
parameters[j] += delta[j] * alpha;
}
// Debug.Log("parameter = " + parameters.Skip(1).Aggregate(parameters[0].ToString(), (acc, next) => acc + ", " + next.ToString()));
alpha *= Mathf.Max((float)Math.Exp(-alpha), 0.1f);
}
// オブジェクトの生成、削除がある場合には、1fで動かす
// そうでない場合には、１秒かけて動かすように調整する
if (!isGenerateOrDeleteObject)
{
var len = firstParam.Length;
var d = new float[len];
for (int i = 0; i < len; i++)
{
var di = parameters[i] - firstParam[i];
// 細かい部分を四捨五入, 秒間スピードに変更
di = ((float)Math.Round(di, 1)) * Time.deltaTime;
parameters[i] = firstParam[i] + di;
}
}
currentTable.SetParameter(parameters);
}