public static KeyBondMDL <T, L> UpdateKeyBondColl <T, L>(T head, L tail, KeyBondColl <T, L> objKeyBondColl, OffsetWeightMDL objHeadWeightMDL, OffsetWeightMDL objTailWeightMDL)
{
if (!objKeyBondColl.Contains(head))
{
KeyBondMDL <T, L> bond = new KeyBondMDL <T, L>();
bond.KeyItem.Key = head;
bond.KeyItem.UpdateOffset = objKeyBondColl.Parameter.TotalOffset;
bond.LinkColl.Parameter.ContainerSize = objKeyBondColl.Parameter.ContainerSize;
bond.LinkColl.Parameter.Threshold = objKeyBondColl.Parameter.Threshold;
objKeyBondColl.Add(bond);
}
KeyItemMDL <T> mdl = objKeyBondColl[head].KeyItem;
mdl.ValidCount = objHeadWeightMDL.Weight + mdl.ValidCount * MemoryDAL.CalcRemeberValue(objKeyBondColl.Parameter.TotalOffset - mdl.UpdateOffset, objKeyBondColl.Parameter);
mdl.TotalCount = objHeadWeightMDL.Weight + mdl.TotalCount * MemoryDAL.CalcRemeberValue(1, objKeyBondColl.Parameter);
mdl.UpdateOffset = objKeyBondColl.Parameter.TotalOffset;
KeyItemColl <L> objLinkColl = objKeyBondColl[head].LinkColl;
if (objTailWeightMDL.Offset < 0)
{
//继承主计数
objLinkColl.Parameter.TotalOffset = objKeyBondColl.Parameter.TotalOffset;
objTailWeightMDL.Offset = 0;
}
KeyItemDAL.UpdateKeyItemColl(tail, objLinkColl, objTailWeightMDL);
objKeyBondColl.Parameter.TotalValidCount = objHeadWeightMDL.Weight + objKeyBondColl.Parameter.TotalValidCount * MemoryDAL.CalcRemeberValue(objHeadWeightMDL.Offset, objKeyBondColl.Parameter);
objKeyBondColl.Parameter.TotalOffset += objHeadWeightMDL.Offset;
return(objKeyBondColl[head]);
}
/// <summary>
/// 使用互信息计算关联系数
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="keyHead"></param>
/// <param name="keyTail"></param>
/// <param name="objKeyBondColl"></param>
/// <returns></returns>
public static double CalcBondRelateValueByPMI <T>(T keyHead, T keyTail, KeyBondColl <T, T> objKeyBondColl)
{
////分别获得相邻单项的频次
//double dHeadValidCount = objKeyBondColl.Contains(keyHead) ? 1 + objKeyBondColl[keyHead].KeyItem.ValidCount * CalcRemeberValue<T,T>(keyHead,objKeyBondColl) : 1;
//double dTailValidCount = objKeyBondColl.Contains(keyTail) ? 1 + objKeyBondColl[keyTail].KeyItem.ValidCount * CalcRemeberValue<T,T>(keyTail,objKeyBondColl) : 1;
//double dTotalValidCount = 1 + 1.0 / ( 1 - MemoryDAL.CalcRemeberValue(1,objKeyBondColl.Parameter) );
////获得相邻项共现的频次
//KeyItemColl<T> objLinkColl = objKeyBondColl.Contains(keyHead) ? objKeyBondColl[keyHead].LinkColl : new KeyItemColl<T>();
//KeyItemMDL<T> mdl = objLinkColl.Contains(keyTail) ? objLinkColl[keyTail] : new KeyItemMDL<T>();
//double dShareValidCount = 1 + mdl.ValidCount * KeyItemHelper.CalcRemeberValue(mdl,objLinkColl);
//double dShareTotalCount = objKeyBondColl.Contains(keyHead) ? 1 + objKeyBondColl[keyHead].KeyItem.TotalCount : 1;
//if (!objKeyBondColl.Contains(keyHead) || !objKeyBondColl.Contains(keyTail)) return 0;
//if (!objKeyBondColl[keyHead].LinkColl.Contains(keyTail)) return 0;
if (!objKeyBondColl.Contains(keyHead) || !objKeyBondColl.Contains(keyTail))
{
return(0);
}
if (!objKeyBondColl[keyHead].LinkColl.Contains(keyTail))
{
return(0);
}
//分别获得相邻单项的频次
double dHeadValidCount = objKeyBondColl[keyHead].KeyItem.ValidCount * CalcRemeberValue <T, T>(keyHead, objKeyBondColl);
double dTailValidCount = objKeyBondColl[keyTail].KeyItem.ValidCount * CalcRemeberValue <T, T>(keyTail, objKeyBondColl);
if (dHeadValidCount < objKeyBondColl.Parameter.Threshold || dTailValidCount < objKeyBondColl.Parameter.Threshold)
{
return(0);
}
double dTotalValidCount = objKeyBondColl.Parameter.TotalValidCount;// 1.0 / (1 - MemoryDAL.CalcRemeberValue(1, objKeyBondColl.Parameter));
//获得相邻项共现的频次
KeyItemColl <T> objLinkColl = objKeyBondColl[keyHead].LinkColl;
KeyItemMDL <T> mdl = objLinkColl[keyTail];
double dShareValidCount = mdl.ValidCount * KeyItemHelper.CalcRemeberValue(mdl, objLinkColl);
double dShareTotalCount = objLinkColl.Parameter.TotalValidCount;
if (dShareTotalCount < objLinkColl.Parameter.Threshold || dShareValidCount < objLinkColl.Parameter.Threshold)
{
return(0);
}
//P(AB)=P(B|A)*P(A)
//result=P(AB)/(P(A)*P(B))=P(B|A)/P(B)
return((dShareValidCount / dShareTotalCount) / (dTailValidCount / dTotalValidCount));
}
public static double CalcBondRelateValueWithLaplace <T>(T keyHead, T keyTail, KeyBondColl <T, T> objKeyBondColl)
{
//分别获得相邻单项的频次
double dHeadValidCount = objKeyBondColl.Contains(keyHead) ? 1 + objKeyBondColl[keyHead].KeyItem.ValidCount * CalcRemeberValue <T, T>(keyHead, objKeyBondColl) : 1;
double dTailValidCount = objKeyBondColl.Contains(keyTail) ? 1 + objKeyBondColl[keyTail].KeyItem.ValidCount * CalcRemeberValue <T, T>(keyTail, objKeyBondColl) : 1;
double dTotalValidCount = 1 + 1.0 / (1 - MemoryDAL.CalcRemeberValue(1, objKeyBondColl.Parameter));
//获得相邻项共现的频次
KeyItemColl <T> objLinkColl = objKeyBondColl.Contains(keyHead) ? objKeyBondColl[keyHead].LinkColl : new KeyItemColl <T>();
KeyItemMDL <T> mdl = objLinkColl.Contains(keyTail) ? objLinkColl[keyTail] : new KeyItemMDL <T>();
double dShareValidCount = 1 + mdl.ValidCount * KeyItemHelper.CalcRemeberValue(mdl, objLinkColl);
double dShareTotalCount = objKeyBondColl.Contains(keyHead) ? 1 + objKeyBondColl[keyHead].KeyItem.TotalCount : 1;
//P(AB)=P(B|A)*P(A)
//result=P(AB)/(P(A)*P(B))=P(B|A)/P(B)
return((dShareValidCount / dShareTotalCount) / (dTailValidCount / dTotalValidCount));
}
/// <summary>
/// 当关键项列表发生时，获取关联项一次都不发生时的概率对数，以及包含的关键项
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="L"></typeparam>
/// <param name="objKeyList"></param>
/// <param name="objMemoryBondColl"></param>
/// <param name="objLinkProbDict">注：此处存放的是相关项一次都不发生的概率的对数</param>
/// <param name="objLinkKeyDict"></param>
public static void UpdateKeyLinkDict <T, L>(List <T> objKeyList, KeyBondColl <T, L> objMemoryBondColl, Dictionary <L, double> objLinkProbDict, Dictionary <L, List <T> > objLinkKeyDict, Dictionary <L, List <int> > objLinkPosDict)
{
for (int k = 0; k < objKeyList.Count; k++)
{
T key = objKeyList[k];
if (!objMemoryBondColl.Contains(key))
{
continue;
}
KeyItemMDL <T> objKeyMDL = objMemoryBondColl[key].KeyItem;
KeyItemColl <L> objLinkColl = objMemoryBondColl[key].LinkColl;
double dKeyValidCount = /* objKeyMDL.ValidCount * */ objKeyMDL.TotalCount * CalcRemeberValue <T, L>(objKeyMDL.Key, objMemoryBondColl);
if (dKeyValidCount < objMemoryBondColl.Parameter.Threshold)
{
continue;
}
foreach (KeyItemMDL <L> link in objLinkColl)
{
double dLinkValidCount = link.ValidCount * CalcRemeberValue <L>(link, objLinkColl);
if (!objLinkProbDict.ContainsKey(link.Key))
{
objLinkProbDict.Add(link.Key, 0);
}
double dLinkProb = dLinkValidCount / dKeyValidCount;
objLinkProbDict[link.Key] += dLinkProb >= 1 ? 0 : Math.Log(1 - dLinkProb); //不发生的概率
if (!objLinkKeyDict.ContainsKey(link.Key))
{
objLinkKeyDict.Add(link.Key, new List <T>());
}
objLinkKeyDict[link.Key].Add(objKeyMDL.Key);
if (!objLinkPosDict.ContainsKey(link.Key))
{
objLinkPosDict.Add(link.Key, new List <int>());
}
objLinkPosDict[link.Key].Add(k);
}
}
}
/// <summary>
/// 使用平均信息熵计算关联
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="keyHead"></param>
/// <param name="keyTail"></param>
/// <param name="objKeyBondColl"></param>
/// <returns></returns>
public static double CalcBondRelateValueByAverageEntropy <T>(T keyHead, T keyTail, KeyBondColl <T, T> objKeyBondColl)
{
if (!objKeyBondColl.Contains(keyHead) || !objKeyBondColl.Contains(keyTail))
{
return(0);
}
if (!objKeyBondColl[keyHead].LinkColl.Contains(keyTail))
{
return(0);
}
//分别获得相邻单项的频次
double dHeadValidCount = objKeyBondColl[keyHead].KeyItem.ValidCount * CalcRemeberValue <T, T>(keyHead, objKeyBondColl);
double dTailValidCount = objKeyBondColl[keyTail].KeyItem.ValidCount * CalcRemeberValue <T, T>(keyTail, objKeyBondColl);
if (dHeadValidCount < objKeyBondColl.Parameter.Threshold || dTailValidCount < objKeyBondColl.Parameter.Threshold)
{
return(0);
}
//获得相邻项共现的频次
KeyItemColl <T> objLinkColl = objKeyBondColl[keyHead].LinkColl;
KeyItemMDL <T> mdl = objLinkColl[keyTail];
double dShareValidCount = mdl.ValidCount * KeyItemHelper.CalcRemeberValue(mdl, objLinkColl);
double dShareTotalCount = objLinkColl.Parameter.TotalValidCount;
if (dShareTotalCount < objLinkColl.Parameter.Threshold || dShareValidCount < objLinkColl.Parameter.Threshold)
{
return(0);
}
double dEuler = 0.5772156649;
double dKeywordCount = objKeyBondColl[keyHead].LinkColl.Count;
double dAverageEntropy = Math.Log(dKeywordCount) + dEuler - 1;
double dKeywordEntropy = (dKeywordCount * dShareValidCount / dShareTotalCount) * (Math.Log(dShareTotalCount) - Math.Log(dShareValidCount));
return(dKeywordEntropy - dAverageEntropy);
}
public static KeyBondColl <T, L> ClearKeyBondColl <T, L>(KeyBondColl <T, L> objKeyBondColl, bool bIsParentTotalOffset = true)
{
double dTotalVaildCount = objKeyBondColl.Parameter.TotalValidCount + 1;// 1.0 / ( 1.0 - MemoryDAL.CalcRemeberValue(1,objKeyBondColl.Parameter) );
KeyBondColl <T, L> objResultColl = new KeyBondColl <T, L>();
objResultColl.Parameter = objKeyBondColl.Parameter;
objResultColl.Parameter.Entropy = 0;
double dClearValidCount = 0;
foreach (KeyBondMDL <T, L> bond in objKeyBondColl)
{
KeyItemMDL <T> mdl = bond.KeyItem;
double dRemeberValue = mdl.ValidCount * MemoryDAL.CalcRemeberValue(objKeyBondColl.Parameter.TotalOffset - mdl.UpdateOffset, objKeyBondColl.Parameter);
if (dRemeberValue > objKeyBondColl.Parameter.Threshold)
{
mdl.ValidCount = dRemeberValue;
mdl.UpdateOffset = 0;
if (!objResultColl.Contains(mdl.Key))
{
dClearValidCount += mdl.ValidCount;
double dProb = mdl.ValidCount / dTotalVaildCount;
objKeyBondColl.Parameter.Entropy += -dProb *Math.Log(dProb);
if (bIsParentTotalOffset)
{
bond.LinkColl.Parameter.TotalOffset = objKeyBondColl.Parameter.TotalOffset;
}
bond.LinkColl = KeyItemDAL.ClearKeyItemColl <L>(bond.LinkColl);
objResultColl.Add(bond);
}
}
}
objResultColl.Parameter.TotalOffset = 0;
objResultColl.Parameter.TotalValidCount = dClearValidCount;
return(objResultColl);
}
/// <summary>
/// 分词（同时自动维护词典）
/// </summary>
/// <param name="text">待分词文本</param>
/// <param name="objCharBondColl">邻键集合（用于生成词库）</param>
/// <param name="objKeyWordColl">词库</param>
/// <param name="maxWordLen">最大词长（建议：细粒度为4、粗粒度为7）</param>
/// <param name="bUpdateCharBondColl">是否同时更新邻键集合</param>
/// <param name="bUpdateKeyWordColl">是否同时更新词库</param>
/// <param name="nRadiusSize">有效键半径</param>
/// <returns>返回分词结果</returns>
public static List <string> Segment(string text, KeyBondColl <string, string> objCharBondColl, KeyItemColl <string> objKeyWordColl, int maxWordLen = 7, bool bUpdateCharBondColl = true, bool bUpdateKeyWordColl = true, int nRadiusSize = 7)
{
if (String.IsNullOrEmpty(text))
{
return(new List <string>());
}
if (maxWordLen <= 0)
{
maxWordLen = text.Length;
}
//总词频
double dLogTotalCount = Math.Log(objKeyWordColl.Parameter.TotalValidCount + 1);// Math.Log(1.0 / ( 1.0 - MemoryDAL.CalcRemeberValue(1,objKeyWordColl.Parameter) ) );// Math.Log(objKeyWordColl.Sum(x =>x.VaildCount* KeyWordBLL.CalcRemeberValue<string>(x.Key,objKeyWordColl)));//
Dictionary <int, List <string> > objKeyWordBufferDict = new Dictionary <int, List <string> >();
Dictionary <int, double> objKeyWordValueDict = new Dictionary <int, double>();
for (int k = 0; k < text.Length; k++)
{
List <string> objKeyWordList = new List <string>();
double dKeyWordValue = 0;
for (int len = 0; len < maxWordLen; len++)
{
int startpos = k - len;
if (startpos < 0)
{
break;
}
string keyword = text.Substring(startpos, len + 1);
if (len > 0 && !objKeyWordColl.Contains(keyword))
{
continue;
}
if (len > 0)
{
if (!objKeyWordColl.Contains(keyword))
{
continue;
}
double dValidCount = KeyItemHelper.CalcValidCount(keyword, objKeyWordColl);
if (dValidCount < objKeyWordColl.Parameter.Threshold)
{
continue;
}
//if (dValidCount < Math.E) continue;//经测试，原始最好
}
double dTempValue = 0;
if (objKeyWordColl.Contains(keyword))
{
KeyItemMDL <string> mdl = objKeyWordColl[keyword];
dTempValue = -(dLogTotalCount - Math.Log(KeyItemHelper.CalcValidCount(keyword, objKeyWordColl)));
}
if (objKeyWordValueDict.ContainsKey(startpos - 1))
{
dTempValue += objKeyWordValueDict[startpos - 1];
if (dKeyWordValue == 0 || dTempValue > dKeyWordValue)
{
dKeyWordValue = dTempValue;
objKeyWordList = new List <string>(objKeyWordBufferDict[startpos - 1]);
objKeyWordList.Add(keyword);
}
}
else
{
if (dKeyWordValue == 0 || dTempValue > dKeyWordValue)
{
dKeyWordValue = dTempValue;
objKeyWordList = new List <string>();
objKeyWordList.Add(keyword);
}
}
}
objKeyWordBufferDict.Add(k, objKeyWordList);
objKeyWordValueDict.Add(k, dKeyWordValue);
if (k > maxWordLen)
{
objKeyWordBufferDict.Remove(k - maxWordLen - 1);
objKeyWordValueDict.Remove(k - maxWordLen - 1);
}
}
if (bUpdateCharBondColl || bUpdateKeyWordColl)
{
KeyWordBLL.UpdateKeyWordColl(text, objKeyWordColl, maxWordLen);
}
return(objKeyWordBufferDict[text.Length - 1]);
}
public static double CalcRemeberValue <T>(KeyItemMDL <T> mdl, KeyItemColl <T> objMemoryBondColl)
{
return(MemoryDAL.CalcRemeberValue(objMemoryBondColl.Parameter.TotalOffset - mdl.UpdateOffset, objMemoryBondColl.Parameter));
}
