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   -> 人工智能 -> K近邻算法 模拟sklearn调用 自定义优化Knn算法模型 ---完整代码 -> 正文阅读

[人工智能]K近邻算法 模拟sklearn调用 自定义优化Knn算法模型 ---完整代码

通过函数与欧拉距离公式实现Knn算法,再调用我们的py文件实现模拟

1.首先设置好欧拉距离公式计算个点之间距离的函数,收集它们的距离。

import numpy as np
import math
from collections import Counter
class Knn:
    def __init__(self,k):
        self.k=k
        self.x_train=None
        self.y_train=None
    def fit(self,x_train,y_train):
        self.x_train=x_train
        self.y_train=y_train
        return  self
    def predict(self,X):
        return np.array([self._predict(x) for x in X])
    def _predict(self,x):
        distance = [math.sqrt(np.sum((x3 - x) ** 2)) for x3 in self.x_train]
        knn_ = np.argsort(distance)
        knn__ = knn_[:self.k]
        knn__1 = [i for i in knn__]
        vnest = self.y_train[knn__1]
        y_sco = [i for i in vnest]
        votos=Counter(y_sco)
        fin_predict=votos.most_common()[0][0]           #获取投票数最多的选择
        return fin_predict

第一步这里的文件夹名称设置为:Knn_neighbor,此py文件名为:Knn_return

这是为了第二步导入第一步的py文件模块

?


2.设置训练集和测试集函数并打乱。

from Knn_neighbor import Knn_return as Knn
import numpy as np
class Knn_neighbor:
    def __init__(self,X,Y):
        self.x_ = X
        self.y = Y
        self.x_1 = np.array(X)
        self.y_1 = np.array(Y)
        assert len(self.x_1)>=5
        assert len(self.x_1)==len(self.y_1)
    def Knn_train(self,test_sor,k):
        a_sor=np.random.permutation(len(self.x_))    #随机打乱所有集长度的下标
        test_sor_size=int(len(self.x_)*test_sor)
        train_=a_sor[test_sor_size:]
        test_=a_sor[:test_sor_size]
        X_train=self.x_1[train_]
        Y_train=self.y_1[train_]
        X_test=self.x_1[test_]
        Y_test=self.y_1[test_]
        knn=Knn.Knn(k)
        knn.fit(x_train=X_train,y_train=Y_train)     #传入训练集
        predict_=knn.predict(X=X_test)               #传入测试集
        return Knn_neighbor.Knn_Run(self,predict_,Y_test,X_test)
    def Knn_Run(self,predict_,Y_test,X_test):
        finnally=np.sum(np.array(predict_==Y_test),dtype='int')/len(X_test)
        return f"机器学习(Knn算法) 正确判断:{np.sum(np.array(predict_==Y_test),dtype='int')}",f"错误判断:{len(Y_test)-np.sum(np.array(predict_==Y_test),dtype='int')}",f'准确率:',finnally
    def Knn_Print(self,test_sor,k):                  #test_sor:测试占总数的比例
        print(Knn_neighbor.Knn_train(self,test_sor,k))      #k:Knn算法考虑个数设置

第二步的py文件名为:Knn_train,为了第三步导入第二步的py文件模块


3.调用我们自己写好的Knn算法,并传入参数(X,Y数据集 + test_sor:测试集占的比例?+ k值:算法考虑的点个数

此处的数据集是随机生成的1000个

from Knn_neighbor import Knn_train
knn=Knn_train.Knn_neighbor(X=[[0.8658851593524342, 1.3008071123615783],
 [1.1191479114066571, 6.711049510980138],
 [2.4603235088363884, 0.5209909397075674],
 [4.923422062208561, 0.5509096018206827],
 [5.98433791114897, 6.620140676055923],
 [5.5064573818254345, 4.511000601156851],
 [4.287828101255311, 6.372596982784051],
 [7.238778437637823, 1.7393226638886916],
 [3.824348052031911, 5.777450851610036],
 [2.8004911290799237, 9.001560844429415],
 [4.872548947808035, 6.706923949363636],
 [1.4043656941060378, 4.31507410947945],
 [8.976326008388824, 7.086568909062122],
 [7.124475876849164, 3.507684361376792],
 [4.957028622673205, 4.8471692286513965],
 [1.3423176076713095, 7.7781329606732195],
 [4.329874244736862, 6.816326228159521],
 [4.606105004610125, 8.350473869147075],
 [8.114195201068837, 8.42607294216927],
 [9.314268080411033, 0.30347152857599147],
 [4.948498126452096, 5.146922199304833],
 [9.234998936228743, 7.888274726370189],
 [8.154331031514909, 7.988017953344197],
 [8.919677233015728, 7.43194661011664],
 [0.6069722419407508, 8.047638652557113],
 [5.730630352692378, 7.214881458670785],
 [2.015683957526011, 6.122105495728983],
 [5.743483681049373, 2.792799771487781],
 [5.377248938656253, 9.482936599568115],
 [6.674956763710039, 1.6701003064161468],
 [7.459856583579311, 5.158363520314895],
 [4.222102049444997, 8.622777144531495],
 [3.2671681137954645, 0.34466286120081513],
 [2.5404378420767437, 1.5708052726132726],
 [9.101444680806356, 5.039260532838482],
 [8.510783784330565, 9.288756382735064],
 [8.828703822418296, 6.465458689648587],
 [6.169476614617679, 5.9903777761416075],
 [6.478149723691269, 4.974925102349798],
 [0.6400790149410407, 4.709776540362112],
 [1.5676990912801658, 2.629935803680201],
 [7.21609254909842, 6.779141541544329],
 [9.448044034939175, 9.554672193922599],
 [8.160716633873738, 0.4054498030339171],
 [4.1382332971549864, 2.4347300200934106],
 [5.19732581659782, 2.4303144007508726],
 [8.926682503923844, 1.9259820422808283],
 [7.997062954998279, 9.601689710329435],
 [1.4510380954215019, 2.881774408258535],
 [4.277818457749411, 1.678280532735491],
 [2.1730411343389577, 6.154624297864412],
 [0.8391759616325278, 9.132874053979851],
 [6.393201283524858, 2.258211666421289],
 [4.326858835755829, 5.00722654285687],
 [6.770471728413304, 1.4186352187024065],
 [8.593796545147972, 1.348713650347162],
 [0.3923396433228221, 5.8951809979295975],
 [6.053889120490908, 1.9032404693747784],
 [5.442359561024564, 7.254818610413771e-05],
 [2.0481614873726195, 8.911904883715446],
 [3.5923127825504473, 2.5606800390693385],
 [5.465262150805565, 3.9696137383807315],
 [7.313728061887289, 3.821064172530245],
 [5.267545019269595, 4.771096736570247],
 [1.6622591232423345, 1.9812396564596757],
 [8.978282313329288, 1.9847529903012695],
 [4.309645043193985, 3.8518756917464203],
 [1.1071399060295883, 9.852770738683134],
 [0.6619825077146058, 0.23270968975591444],
 [5.5038852940787875, 0.8740136137506194],
 [9.125149756105817, 6.528971198543642],
 [0.08468097510209827, 3.0463798333072347],
 [2.675374605154517, 9.34790673606178],
 [8.899572393724233, 6.59734744459886],
 [6.597921108197156, 6.1591522161378105],
 [3.1821572471381474, 1.657841082230268],
 [4.856941034647599, 5.778704970490008],
 [9.855183953513382, 2.270022637722784],
 [5.570131384590193, 6.180077614271764],
 [0.2429361525491469, 0.7946281684749323],
 [4.041292217781188, 3.2098341506594554],
 [0.2433594161145869, 7.479287952173301],
 [4.369847041218856, 9.349686935936909],
 [5.953217058268093, 3.3075927826953078],
 [8.110835671169985, 0.18656745616397075],
 [9.921301262000796, 6.480230608117875],
 [3.24569047375989, 4.516259772281243],
 [4.5907509107764195, 9.913116098195903],
 [1.673460055654712, 6.01641239046764],
 [8.120073259134143, 0.5846918052152372],
 [1.8168619431831468, 2.1357412753323146],
 [9.248808039372529, 4.552480524526413],
 [7.620050769585728, 2.6874701281315794],
 [0.6592075475843051, 8.478610587994748],
 [9.51955744230062, 9.698125463962821],
 [8.801444261864319, 4.743498652833397],
 [4.86303721084949, 1.0466525681649474],
 [2.066234456157451, 9.559536386404009],
 [6.718468401430139, 9.593346574285178],
 [4.09627184253921, 4.344698114786469],
 [7.164106063437733, 1.9025788457701487],
 [3.7470083728852464, 6.766900068958456],
 [6.492608667908818, 8.30950551642705],
 [5.703044410907855, 1.6376935154067562],
 [9.49033725573125, 3.08274246845024],
 [0.237257765344413, 2.153959482767215],
 [7.251233349030887, 1.3869910123963602],
 [8.248847505399077, 5.477405302346052],
 [5.975791193810602, 6.187518384516099],
 [1.4341953933609042, 1.8918543628445017],
 [6.957122985924977, 3.685009530735095],
 [8.980946572124044, 6.882221574139328],
 [1.944960051050627, 0.6942059679143187],
 [6.08363534957612, 6.825068094458374],
 [8.035168920444551, 0.2711279004306111],
 [4.424786695947622, 2.281149246354831],
 [7.627588305974577, 9.367713591525131],
 [0.20573384261188488, 2.974305618936066],
 [4.937757524148358, 4.921227592738418],
 [1.1305406284225583, 6.93209472773119],
 [3.388552862704767, 6.329142249835624],
 [0.6143078116574041, 0.06291030662285313],
 [0.2288984062352062, 3.7180276473215446],
 [3.1321115165382207, 8.74475973406],
 [6.399528213941975, 0.13005397228224802],
 [2.571523719177773, 9.387676019598647],
 [2.241000864773177, 0.11086445639789333],
 [1.2271572218859017, 8.405243970350224],
 [7.478869967446685, 3.576820377993722],
 [2.785539596231531, 6.393461615625842],
 [4.08223577939553, 6.533200067896897],
 [8.805145443793963, 5.533550600748817],
 [0.035206101514927424, 3.000351220333971],
 [5.758294988440039, 4.023650146653321],
 [3.727673709538626, 7.502468634575732],
 [5.889839202548898, 3.1346605934057417],
 [5.089699514780799, 3.0004346246997593],
 [4.530826605962936, 0.8399533567995665],
 [5.1669677547098125, 8.558258498139258],
 [8.431217100420728, 3.3509712992192195],
 [5.360127012286428, 3.492440682088721],
 [6.179215724188449, 4.649593796128295],
 [6.723673849720852, 2.4330175899089337],
 [2.026012809558164, 9.135576056713669],
 [5.861674149524749, 0.4280781201737138],
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 [2.1472257767269087, 3.690838442486528],
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 [4.115516910268351, 4.186129066572865],
 [9.339480905572712, 3.990275472347821],
 [4.119287411279292, 3.1799141434709655],
 [2.390297526569416, 4.812839034524849],
 [9.9971128415671, 8.624288819783958],
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 [8.549026493896095, 7.141858604104543],
 [1.5027723272620908, 1.5914600191612938],
 [1.54191858243644, 2.6352525438344343],
 [8.781026898368541, 9.304924714569605],
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 [6.139940125625833, 5.437389042500186],
 [2.24404217543577, 3.7736423154599708],
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 [5.903035902984259, 6.481728323334348],
 [0.4440368903758063, 5.8862914466775855],
 [9.774393462028053, 2.9917338437720034],
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 [2.1499006716792635, 4.398858835545739]],Y=[0, 0, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0])
#调用Knn_Print方法
knn.Knn_Print(test_sor=0.2,k=3)

此处设置的 test_sor=0.2,k=3


4.Knn算法实现展示


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