Question

在Accord框架中，KD树中的最近邻居遇到麻烦。

我有以下代码：

        Dim pointList As New List(Of Double())

    pointList.Add({1.46939327461431, 0.728514297626614, 0.611199911110152})
    pointList.Add({1.29616291008733, 0.715801752689344, 0.76567439368152})
    pointList.Add({1.21998918620861, 0.714409383988963, 0.624730329395141})
    pointList.Add({1.40033932275504, 0.837025245715406, 1.41604934632078})
    pointList.Add({1.30264996956905, 1.27968341310233, 1.27632592090544})
    pointList.Add({1.25685958475519, 0.789886517499592, 0.778997383833871})
    pointList.Add({0.764351117156931, 1.2470180631204, 1.08164987755654})
    pointList.Add({1.34663911274196, 1.44441179931612, 1.09005587026757})
    pointList.Add({0.869899807222235, 0.597165790809216, 0.675122144359106})
    pointList.Add({0.562320470292234, 1.33413629676582, 1.38153502250285})
    pointList.Add({0.97461478445286, 0.660162336721388, 1.09912310227134})
    pointList.Add({0.669855892884259, 1.27075839972262, 0.818628838025211})
    pointList.Add({0.764710954287365, 1.39133804754551, 1.11929873503679})
    pointList.Add({0.782382040627924, 1.21912260024516, 1.34580185198657})
    pointList.Add({1.36869464864441, 0.848445415993126, 1.22253001356577})
    pointList.Add({0.620546528532536, 1.22197895901718, 0.820606748519882})
    pointList.Add({1.17416007469763, 1.49776753070633, 0.532315387936957})
    pointList.Add({1.05021874503986, 1.21665051789072, 0.649302920270058})
    pointList.Add({1.09174472241809, 1.23229029263019, 0.916774281520864})
    pointList.Add({1.45883823612704, 1.0997149335696, 1.35632498089295})
    pointList.Add({2.97155494008615, 3.01953923740247, 2.70901488969513})
    pointList.Add({3.11206042666745, 2.64570926816952, 2.93426987723382})
    pointList.Add({2.69997433997831, 3.21066411895657, 2.65891902388905})
    pointList.Add({3.36155274149625, 3.14215415932562, 3.35617956399353})
    pointList.Add({3.05323570716861, 3.39666004066799, 2.56521646117696})
    pointList.Add({3.04334440892472, 2.93170442205242, 3.29259333216362})
    pointList.Add({2.83571388272942, 3.47374025854163, 3.48463520112399})
    pointList.Add({2.50888367106954, 3.07418111562898, 2.64570009782945})
    pointList.Add({3.15226279076008, 2.75025250495814, 3.00843798147578})
    pointList.Add({2.95821265593467, 3.11752142253449, 3.02171111394064})
    pointList.Add({2.66071004287717, 2.94412783824948, 3.19547025759234})
    pointList.Add({3.21605800684465, 3.2694710758628, 3.48450254875554})
    pointList.Add({3.34954229884519, 3.31347474485585, 3.15606355294825})
    pointList.Add({3.42331147061332, 3.03778835755942, 3.08440740773763})
    pointList.Add({3.45596302599724, 3.24599918759845, 2.59356922624118})
    pointList.Add({3.22593834176523, 3.27319241757686, 2.50651309915885})
    pointList.Add({2.848410415644, 2.76083476656012, 2.52695199319587})
    pointList.Add({3.31350316599623, 2.90990497151616, 3.13164772902983})
    pointList.Add({3.23849937268619, 2.81275726707495, 2.70824045540564})
    pointList.Add({3.27010402897502, 2.50554763932174, 2.89074370855214})
    pointList.Add({6.03171604366068, 6.2369863658183, 6.46052767137455})
    pointList.Add({6.21868609107726, 6.60324675344064, 6.0760255188223})
    pointList.Add({6.68347083745324, 6.38958336177638, 6.51876646431921})
    pointList.Add({6.02590336125965, 6.29314605198953, 6.87721088428824})
    pointList.Add({6.28273404197246, 6.49501950640024, 6.3082468027405})
    pointList.Add({6.08005800815136, 6.26345301557321, 6.28448164273499})
    pointList.Add({6.34407817456128, 6.72248530698692, 6.71923154146295})
    pointList.Add({6.22222319986778, 6.40555911096642, 6.52567583570522})
    pointList.Add({6.41064679354086, 6.1233007580428, 6.98013242023898})
    pointList.Add({6.32178331420294, 6.97241177046298, 6.29296629210209})
    pointList.Add({6.0501377402065, 6.06212921598852, 6.48671837639896})
    pointList.Add({6.25690273546385, 6.37864156635787, 6.50668821102947})
    pointList.Add({6.9068586336927, 6.81987015929395, 6.66927897353305})
    pointList.Add({6.80226723171158, 6.34029718742271, 6.53200446803696})
    pointList.Add({6.46162490340446, 6.65813834100971, 6.0618085860513})
    pointList.Add({6.54163382082062, 6.72005185247703, 6.11382541233568})
    pointList.Add({6.3269358376417, 6.84327085039352, 6.91845836975826})
    pointList.Add({6.07847962725181, 6.43149550206036, 6.6411765986094})
    pointList.Add({6.29041807273645, 6.25503712894561, 6.90024238715934})
    pointList.Add({6.46479653452691, 6.45717092332963, 6.06954748288729})

    Dim test = pointList.ToArray

    ' To create a tree from a set of points, we use
    Dim tree = KDTree.FromData(Of Integer)(pointList.ToArray)

    Dim query = New Double() {6, 6, 6}
    Dim radius As Double = 2.0

    ' Locate all nearby points within an Euclidean distance of 1.5
    ' (answer should be a single point located at position (5,4))
    '
    Dim result As KDTreeNodeCollection(Of KDTreeNode(Of Integer)) = tree.Nearest(query, radius)

问题是我根据设置的半径值获得了一定数量的节点。就像该方法将我放置在radius参数中的任何内容并将其转换为整数并返回该数量的点。

我期望的是特定半径内的所有点。上面的案例中，如果我使用6、6、6作为搜索点，并且半径为2，由于将会有大约20个点位于6、6、6左右，因此我希望可以得到大约20个点。相反，我得到了两个最接近的点。

在文档中记录了两种具有相同签名的不同方法。这使我感到困惑。

Documentation for Accord KD tree

KDTreeBase(Of TNode) . Nearest Method (Double() , Double)

和

KDTreeBase(Of TNode) . Nearest Method (Double() , Double)

我在做什么错了？

编辑：当我使用文档中的示例时：

    Dim points =
{
    New Double() { 2, 3 },
    New Double() { 5, 4 },
    New Double() { 9, 6 },
    New Double() { 4, 7 },
    New Double() { 8, 1 },
    New Double() { 7, 2 }
}

' To create a tree from a set of points, we use
Dim tree = KDTree.FromData(Of Integer)(points)

' Now we can manually navigate the tree
Dim node = tree.Root.Left.Right

' Or traverse it automatically
For Each n As KDTreeNode(Of Integer) In tree
    Dim location = n.Position
    Console.WriteLine(location.Length)
Next

' Given a query point, we can also query for other
' points which are near this point within a radius
'
Dim query = New Double() {5, 3}

' Locate all nearby points within an Euclidean distance of 1.5
' (answer should be a single point located at position (5,4))
'
Dim result = tree.Nearest(query, radius:=1.5)

' We can also use alternate distance functions
tree.Distance = Function(a, b) Accord.Math.Distance.Manhattan(a, b)

' And also query for a fixed number of neighbor points
' (answer should be the points at (5,4), (7,2), (2,3))
'
Dim neighbors = tree.Nearest(query, neighbors:=3)

我在网上收到一个错误：昏暗的结果= tree.Nearest（query，radius：= 1.5）

说：

“半径”不是“公共重载函数Nearest（位置为Double（），邻居为Integer）和KDTreeNodeCollection（Of KDTreeNode（Of Integer））”的参数。

就像VB.NET在参数列表中没有看到半径或距离为double类型的两种方法一样。

Accord.net KD-Tree最近邻居问题

0 个答案: