public static string ShowKeyBondCollEx(KeyBondColl <string, string> objKeyBondColl, List <string> objKeyWordList, int nLinkTopCount, bool bIsOrderbyDesc = true, string splitChar = "\t", string spaceChar = "\r")
{
StringBuilder sb = new StringBuilder();
sb.AppendLine(String.Format("[{0}]{1}|{2}|{3}|{4}", "词项", "遗忘词频", "总词频", "词权重", "成熟度"));
sb.AppendLine("=============================================");
StringBuilder sbkey = new StringBuilder();
HashSet <KeyItemMDL <string> > objBufferSet = new HashSet <KeyItemMDL <string> >();
foreach (string keyword in objKeyWordList)
{
if (String.IsNullOrWhiteSpace(keyword))
{
continue;
}
if (!objKeyBondColl.Contains(keyword))
{
continue;
}
if (sbkey.Length > 0)
{
sbkey.Append("、");
}
sbkey.Append(keyword);
KeyBondMDL <string, string> bond = objKeyBondColl[keyword];
if (objBufferSet.Count <= 0)
{
objBufferSet.UnionWith(bond.LinkColl);
}
else
{
HashSet <KeyItemMDL <string> > buffer = new HashSet <KeyItemMDL <string> >();
foreach (KeyItemMDL <string> mdl in objBufferSet)
{
if (bond.LinkColl.Contains(mdl.Key))
{
buffer.Add(mdl);
}
}
objBufferSet = new HashSet <KeyItemMDL <string> >(buffer);
}
}
KeyItemColl <string> objBufferColl = new KeyItemColl <string>();
foreach (KeyItemMDL <string> mdl in objBufferSet)
{
if (!objBufferColl.Contains(mdl.Key))
{
objBufferColl.Add(mdl);
}
}
sb.AppendLine();
sb.AppendLine(String.Format("【{0}】", sbkey));
sb.Append(KeyItemHelper.ShowKeyItemColl(objBufferColl, nLinkTopCount, false, bIsOrderbyDesc, false, splitChar, spaceChar));
return(sb.ToString());
}
public static double CalcRemeberValue <T>(T key, KeyItemColl <T> objMemoryItemColl)
{
if (objMemoryItemColl.Contains(key))
{
return(MemoryDAL.CalcRemeberValue(objMemoryItemColl.Parameter.TotalOffset - objMemoryItemColl[key].UpdateOffset, objMemoryItemColl.Parameter));
}
return(0);
}
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>
/// 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 Dictionary <string, HashSet <int> > GetKeyWingMatchedList(List <string> objKeyList, KeyItemColl <string> objKeyWordColl, KeyBondColl <string, string> objKeyCloudColl, KeyBondColl <string, string> objKeyWingColl, string splitChar = "\t", int nRadiusSize = 7)
{
HashSet <int> objKeyPosSet = new HashSet <int>();
Dictionary <int, Dictionary <int, double> > objPosWeightDict = new Dictionary <int, Dictionary <int, double> >();
#region 获得每个索引位对应的关联位置的关联系数
for (int k = 0; k < objKeyList.Count; k++)
{
objKeyPosSet.Add(k);
objPosWeightDict.Add(k, new Dictionary <int, double>());
string keyTail = objKeyList[k];
for (int t = 1; t <= nRadiusSize; t++)
{
int nPos = k - t;
if (nPos < 0)
{
break;
}
string keyHead = objKeyList[nPos];
if (objPosWeightDict.ContainsKey(nPos))
{
//double dRelateValue= KeyBondHelper.CalcBondRelateValue(keyHead,keyTail,objKeyCloudColl);
// if (KeyBondHelper. GetRandomNumber(0,dRelateValue) > KeyBondHelper.GetRandomNumber(0,Math.E))
// {
// objPosWeightDict[nPos].Add(k,dRelateValue);
// objPosWeightDict[k].Add(nPos,dRelateValue);
// }
if (KeyBondHelper.IsBondValid(keyHead, keyTail, objKeyCloudColl))
{
double dLinkValidCount = KeyBondHelper.CalcTailValidCount(keyHead, keyTail, objKeyCloudColl);
objPosWeightDict[nPos].Add(k, dLinkValidCount);
objPosWeightDict[k].Add(nPos, dLinkValidCount);
}
}
}
}
#endregion
Dictionary <string, HashSet <int> > objKeyPosDict = new Dictionary <string, HashSet <int> >();
#region 将位置转换为词翼
foreach (KeyValuePair <int, Dictionary <int, double> > pair in objPosWeightDict)
{
SortedSet <int> objPosWingSet = new SortedSet <int>();
objPosWingSet.Add(pair.Key);
IOrderedEnumerable <KeyValuePair <int, double> > buffer = pair.Value.OrderByDescending(x => x.Value);
foreach (KeyValuePair <int, double> kvp in buffer)
{
StringBuilder sb = new StringBuilder();
int nLastPos = -1;
foreach (int pos in objPosWingSet)
{
if (pos - nLastPos > 1)
{
sb.Append(splitChar);
}
sb.Append(objKeyList[pos]);
nLastPos = pos;
}
if (nLastPos + 1 < objKeyList.Count)
{
sb.Append(splitChar);
}
string keywing = sb.ToString();
if (!objKeyPosDict.ContainsKey(keywing))
{
objKeyPosDict.Add(keywing, new HashSet <int>());
}
objKeyPosDict[keywing].UnionWith(objPosWingSet);
objPosWingSet.Add(kvp.Key);
}
}
#endregion
Dictionary <string, double> objKeyWeightDict = new Dictionary <string, double>();
Dictionary <string, HashSet <int> > objKeyPosExDict = new Dictionary <string, HashSet <int> >();
double dLogTotalCount = Math.Log(1.0 / (1.0 - MemoryDAL.CalcRemeberValue(1, objKeyWordColl.Parameter)));
#region 获得库中存在的词翼，同时累计匹配词的权重
foreach (KeyValuePair <string, HashSet <int> > pair in objKeyPosDict)
{
string keywing = pair.Key;
foreach (int pos in pair.Value)
{
string keyword = objKeyList[pos];
double dKeyWordValidCount = objKeyWordColl.Contains(keyword) ? KeyItemHelper.CalcValidCount(keyword, objKeyWordColl) + 1 : 1;
double dKeyWordWeight = dLogTotalCount - Math.Log(dKeyWordValidCount);
if (objKeyWingColl.Contains(keyword))
{
if (objKeyWingColl[keyword].LinkColl.Contains(keywing))
{
if (!objKeyWeightDict.ContainsKey(keywing))
{
objKeyWeightDict.Add(keywing, dKeyWordWeight);
}
else
{
objKeyWeightDict[keywing] += dKeyWordWeight;
}
if (!objKeyPosExDict.ContainsKey(keywing))
{
objKeyPosExDict.Add(keywing, new HashSet <int>());
}
objKeyPosExDict[keywing].Add(pos);
}
}
}
}
#endregion
Dictionary <string, HashSet <int> > dict = new Dictionary <string, HashSet <int> >();
#region 获得最佳匹配词翼
foreach (KeyValuePair <string, double> pair in objKeyWeightDict.OrderByDescending(x => x.Value))
{
if (objKeyPosSet.Count <= 0)
{
break;
}
if (!objKeyPosSet.Any(x => objKeyPosExDict[pair.Key].Contains(x)))
{
continue;
}
if (!dict.ContainsKey(pair.Key))
{
dict.Add(pair.Key, objKeyPosExDict[pair.Key]);
}
objKeyPosSet.RemoveWhere(x => objKeyPosExDict[pair.Key].Contains(x));
}
#endregion
return(dict);
}