def ensemble(train_features, train_labels, test_features, test_labels):
print("\n\nEnsemble")
print(
"===================================================================")
ks = [1, 3, 5]
for k in ks:
print("k = ", k)
m_knn = knc(n_neighbors=k)
parameters = {'kernel': ('linear', 'rbf'), 'C': [1, 10]}
svr = svm.SVC(probability=True)
m_svm = GridSearchCV(svr, parameters).fit(train_features, train_labels)
m_mlp = MLPClassifier(max_iter=1000)
clf1 = VotingClassifier(estimators=[('knn', m_knn), ('svm', m_svm),
('mpl', m_mlp)],
voting='hard')
clf2 = VotingClassifier(estimators=[('knn', m_knn), ('svm', m_svm),
('mpl', m_mlp)],
voting='soft')
clf1.fit(train_features, train_labels)
clf2.fit(train_features, train_labels)
result1 = clf1.predict(test_features)
result2 = clf2.predict(test_features)
printResult(test_labels, result)
printResult(test_labels, result)
print(
"===================================================================")
def model_data(training_data):
dtc = DecisionTreeClassifier(random_state=9, min_samples_split=5)
dtc.fit(training_data['data'], training_data['result'])
nn = MLPClassifier(solver='lbfgs',
alpha=1e-5,
hidden_layer_sizes=(5, 2),
random_state=1)
nn.fit(training_data['data'], training_data['result'])
svc = SVC(C=100, kernel="linear")
svc.fit(training_data['data'], training_data['result'])
rfc = RFC(n_estimators=10,
criterion='entropy',
max_depth=10,
min_samples_split=5,
bootstrap='true',
random_state=None)
rfc.fit(training_data['data'], training_data['result'])
knc_map = knc(n_neighbors=15, weights='distance')
knc_map.fit(training_data['data'], training_data['result'])
gbc_map = gbc(n_estimators=150, verbose=0)
gbc_map.fit(training_data['data'], training_data['result'])
return {
'Decision Tree Classifier': dtc,
'Neural Networks': nn,
'Support Vector Machines': svc,
'Random Forest Classification': rfc,
'k Nearest Neighbours': knc_map,
'Gradient Boosting Classifier': gbc_map
}
def voxelizePart(grid, scale, translate, dims, cloud, labels, partId,
outputPath):
bbmin = np.min(cloud, axis=0)
bbmax = np.max(cloud, axis=0)
center = 0.5 * (bbmax - bbmin)
w1s = np.where(grid == 1)
grid_xyz = [[x, y, z] for x, y, z in zip(w1s[0], w1s[1], w1s[2])]
grid_xyz = np.array(grid_xyz)
grid_xyz_sc = []
for p in grid_xyz:
trans_p = [0, 0, 0]
trans_p[0] = scale * ((1 / scale) * center[0] - 0.5 + float(
(p[0] + 0.5) / dims)) + translate[0]
trans_p[1] = scale * ((1 / scale) * center[1] - 0.5 + float(
(p[1] + 0.5) / dims)) + translate[1]
trans_p[2] = scale * ((1 / scale) * center[2] - 0.5 + float(
(p[2] + 0.5) / dims)) + translate[2]
grid_xyz_sc.append(trans_p)
grid_xyz_sc = np.array(grid_xyz_sc)
#grid_xyz_sc is now in the same coordinate frame as the point-cloud
clf = knc(n_neighbors=1)
clf.fit(cloud, labels)
voxelLabels = clf.predict(grid_xyz_sc)
partIndices = voxelLabels == partId
partVoxelIndices = grid_xyz[partIndices, :]
partvox = np.zeros((dims, dims, dims, 1))
partvox[partVoxelIndices[:, 0], partVoxelIndices[:, 2],
partVoxelIndices[:, 1], 0] = 1
partvox = partvox.astype('int')
partbinvox = binvox_rw.Voxels(partvox, (dims, dims, dims), [0, 0, 0], 1,
'xzy')
partname = 'model_' + str(partId) + '.binvox'
binvox_rw.write(partbinvox, open(os.path.join(outputPath, partname), 'wb'))
def bias_variance(data, nbrs, bootstrap=10):
result_dict = {}
for bootsrap_num in bootstrap:
train, test = split(data)
classifier = knc(n_neighbors=nbrs)
coordinates_train, labels_train = train[:, :2], train[:, -2]
classifier.fit(coordinates_train, labels_train)
for instance in test:
coordinates_test = instance[:2]
pred = classifier.predict(coordinates_test)
result_dict[instance[:-1]].append(pred)
def runAlgo(filename):
# Read a given dataset to csv and then run it through six different
# classifiers. 3 Normal classifiers and 3 ensembles
print(filename)
d, t = load_csv(filename)
runModel("Decision Tree", tree.DecisionTreeClassifier(), d, t)
runModel("KNearesest Ne", knc(), d, t)
runModel("Neural Networ", MLPClassifier(hidden_layer_sizes=(30,30,30)), d, t)
runModel("Bagging ", BaggingClassifier(tree.DecisionTreeClassifier(), max_samples=0.9, max_features=0.9), d, t)
runModel("Random Forest", RandomForestClassifier(n_estimators=100), d, t)
runModel("AdaBoost ", AdaBoostClassifier(n_estimators=100), d, t)
def bias_variance(data, nbrs, bootstrap=10):
result_dict = {}
for bootsrap_num in bootstrap:
train, test = split(data)
classifier = knc(n_neighbors=nbrs)
coordinates_train, labels_train = train[:, :2], train[:, -2]
classifier.fit(coordinates_train, labels_train)
for instance in test:
coordinates_test = instance[:2]
pred = classifier.predict(coordinates_test)
result_dict[instance[:-1]].append(pred)
def knn(f_train,l_train,f_test):
from sklearn.neighbors import KNeighborsClassifier as knc
import time
clf=knc(n_neighbors=3)
start_time=time.time()
clf.fit(f_train,l_train)
print("Training Time: %s seconds"%(time.time()-start_time))
start_time=time.time()
pre=clf.predict(f_test)
print("Predicting Time: %s seconds"%(time.time()-start_time))
return pre
def handwritingClassTestSKL():
#测试集的Labels
hwLabels = []
#返回trainingDigits目录下的文件名
trainingFileList = listdir("trainingDigits")
#返回文件夹下文件的个数
m = len(trainingFileList)
#初始化训练的Mat矩阵,测试集
trainingMat = np.zeros((m, 1024))
#从文件名中解析出训练集的类别
for i in range(m):
#获得文件的名字
fileNameStr = trainingFileList[i]
#fileStr = fileNameStr.split('.')[0]
#获得分类的数字
classNumStr = int(fileNameStr.split('_')[0])
#将获得的类别添加到hwLabels中
hwLabels.append(classNumStr)
#将每一个文件的1x1024数据存储到trainingMat矩阵中
trainingMat[i, :] = img2vector("trainingDigits/%s" % fileNameStr)
"""
SK-learn method
"""
#构建kNN分类器
neigh = knc(n_neighbors=3, algorithm='auto')
#拟合模型, trainingMat为测试矩阵,hwLabels为对应的标签
neigh.fit(trainingMat, hwLabels)
#返回testDigits目录下的文件列表
testFileList = listdir("testDigits")
#错误检测计数
errorCount = 0.0
#测试数据的数量
mTest = len(testFileList)
#从文件中解析出测试集的类别并进行分类测试
for i in range(mTest):
#获得文件的名字
fileNameStr = testFileList[i]
#fileStr = fileNameStr.split('.')[0]
#获得分类的数字
classNumStr = int(fileNameStr.split('_')[0])
#获得测试集的1x1024向量,用于训练
vectorUnderTest = img2vector("testDigits/%s" % fileNameStr)
#获得预测结果
#classifierResult = classify0(vectorUnderTest, trainingMat, hwLabels, 3)
classifierResult = neigh.predict(vectorUnderTest)
print("the classifier came back with: %d, the real answer is: %d" %
(classifierResult, classNumStr))
if (classifierResult != classNumStr): errorCount += 1.0
print("\n the total number of errors is: %d" % errorCount)
print("\n the total error rate is: %100.2f%%" %
(errorCount / float(mTest) * 100))
def run(menu, value):
dataset = Dataset(menu.getValue("d") + ".data")
percent = int(menu.getValue("p")) / 100
nNeighbors = int(menu.getValue("k"))
algorithm = menu.getValue("a")
te_data, tr_data, te_target, tr_target = ms.train_test_split(
dataset.data, dataset.target, test_size=percent)
classifier = Classifier(nNeighbors) if algorithm == "Quade" else knc(
n_neighbors=nNeighbors)
classifier.fit(tr_data, tr_target)
predicted_target = classifier.predict(te_data)
print("Accuracy of Algorithm:", accuracy(te_target, predicted_target))
def knn_function(train_features, train_labels, test_features, test_labels):
print("\n\nKNN")
print(
"===================================================================")
ks = [1, 3, 5]
for k in ks:
knn = knc(n_neighbors=k)
knn.fit(train_features, train_labels)
result = knn.predict(test_features)
print("k = ", k)
printResult(test_labels, result)
print(
"===================================================================")
def train_model_knc (features, labels) :
# Scaling is very important for distance based classifiers
scaler = StandardScaler()
clf_knc = knc()
# Transforms are applied exactly in the order specified
estimators = [('sscaler', scaler), ('knc', clf_knc)]
# p = 2 corresponds to Euclidean distance, p = 1 corresponds to Manhattan distance
params_dict = {'knc__n_neighbors': [5, 8, 10, 15, 20, 25, 30], 'knc__weights':['uniform', 'distance'], 'knc__p': [1, 2]}
clf = GridSearchCV(Pipeline(estimators), params_dict, scoring = 'roc_auc', cv = 5)
clf.fit(features, labels)
print ("Best estimator: ", clf.best_estimator_)
print ("Best best scores: %.4f" %(clf.best_score_))
#print ("Best grid scores: ", clf.grid_scores_)
return clf
def make_prediction_grid(points, outcomes, limits, steps=1, k=5):
(x_min, x_max, y_min, y_max) = limits
xs = np.arange(x_min, x_max, steps)
ys = np.arange(y_min, y_max, steps)
knn = knc(n_neighbors=k)
knn.fit(points, outcomes)
(xx, yy) = np.meshgrid(xs, ys)
prediction_grid = np.zeros(xx.shape, dtype=int)
for i, x in enumerate(xs):
for j, y in enumerate(ys):
p = np.array([x, y])
prediction_grid[j, i] = knn.predict([p])[0]
return (xx, yy, prediction_grid)
def covid_knn(trainfile, testfile, process_rank):
with open(trainfile) as covidfile:
cases = pd.read_csv(covidfile, index_col="id")
with open(testfile) as casefile:
tests = pd.read_csv(casefile, index_col="id")
features = ['age', 'bmi', 'HbA1c']
cases = normalizeDF(cases, features)
features.append('resp_disease')
X = cases[features].values
y = cases['death_risk'].values
# split the dataset
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.2,
random_state=0)
# knn classification
classifier = knc(n_neighbors=6)
classifier.fit(X_train, y_train)
y_pred = classifier.predict(X_test)
# knn testing with input files
tests = normalizeDF(tests, features)
Z = tests[features].values
Z_pred = classifier.predict(Z)
print("The predictions for: " + testfile)
print(Z_pred)
if process_rank == 0:
accuracy = acc(y_test, y_pred) * 100
print("Accuracy of the model is: ")
print(accuracy)
from time import time
from split import data_split
X_train, X_test, Y_train, Y_test = data_split()
from sklearn.neighbors import KNeighborsClassifier as knc
t0 = time()
clf = knc(n_neighbors=20)
clf.fit(X_train, Y_train)
print("Training Time: " + str(round(time() - t0, 3)) + "s")
t1 = time()
pred = clf.predict(X_test)
print("Testing Time: " + str(round(time() - t1, 3)) + "s")
from sklearn.metrics import accuracy_score
print(accuracy_score(Y_test, pred))
model.fit( X , y ) X_test = [ row[ :-1 ] for row in test_data ] y_real = [ row[ -1 ] for row in test_data ] y_pred = model.predict( X_test ) print report( y_real , y_pred ) tp = lambda x : 1 if x == 'spam' else 0 real = [ tp( v ) for v in y_real ] pred = [ tp( v ) for v in y_pred ] print mean_absolute_error( real , pred ) print mean_squared_error( real , pred ) if __name__ == '__main__' : if len( sys.argv ) > 2 : train_fpath , test_fpath = sys.argv[ 1: ] train_data = import_csv( train_fpath ) test_data = import_csv( test_fpath ) ''' DECISION TREE ''' cf = dtc( criterion = 'gini' , max_depth = 50 ) classify( cf , train_data , test_data , 'decision_tree' ) ''' NEAREST NEIGHBORS ''' cf = knc( n_neighbors = 1 , metric = 'hamming' ) classify( cf , train_data , test_data , 'knearest_neighbors' ) ''' NAIVE BAYES ''' cf = mnb( alpha = 100.0 ) classify( cf , train_data , test_data , 'naive_bayes' ) else : print "Usage python %s [train_csv_file] [test_csv_file]" % sys.argv[ 0 ]
test_data = np.array(test)
print("CONVERTED TO NUMPY ...")
print()
print("SPLITTING TRAIN DATA ...")
print()
features = []
target = []
#obtaining categories in target
target = train['Category'].values
features = train_data[0:, 1:5]
model = knc(n_neighbors = 9)
#model = knc(n_neighbors = 9, n_jobs = -1)
#
print('TRAINING THE MODEL USING...', model)
print()
print('MODELLING DATA...')
#splitting into train and target variables
print()
model.fit(features,target)
print('MODELLING DONE...')
print()
print('PREDICTING TEST SET...')
from sklearn.preprocessing import StandardScaler as ss
df = pd.read_csv('Social_Network_Ads.csv')
#sns.scatterplot(df['EstimatedSalary'],df['Purchased'])
df.drop('User ID', inplace=True, axis=1)
#print(df.info())
gen = pd.get_dummies(df['Gender'], drop_first=True)
df.drop('Gender', inplace=True, axis=1)
#print(gen.head())
dff = pd.concat([df, gen], axis=1)
#print(dff.info())
x = dff.drop('Purchased', axis=1)
y = dff['Purchased']
print(y.head())
sss = ss()
xx = sss.fit_transform(x)
xtrain, xtest, ytrain, ytest = train_test_split(xx,
y,
test_size=0.3,
random_state=101)
cm = knc(n_neighbors=3)
cm.fit(xtrain, ytrain)
pdata = cm.predict(xtest)
creport = cr(ytest, pdata)
print(creport)
y = train_data['Survived']
X = train_data.drop(['Survived'], axis=1)
# # ML
# In[ ]:
from sklearn.tree import DecisionTreeClassifier as dtc
model1 = dtc()
model1.fit(X, y)
from sklearn.neighbors import KNeighborsClassifier as knc
model2 = knc(n_neighbors=5)
model2.fit(X, y)
from sklearn.svm import SVC
model4 = SVC(C=1.0, kernel='rbf', degree=3)
model4.fit(X, y)
from sklearn.ensemble import RandomForestClassifier as rfc
model3 = rfc(n_estimators=100,
max_depth=3,
max_features=0.5,
min_samples_leaf=32)
model3.fit(X, y)
def classify(s):
import pandas as pd
import numpy
import pandas_montecarlo
from scipy.stats import shapiro, kruskal, f_oneway
from sklearn.ensemble import RandomForestClassifier as rfc
from sklearn.neighbors import KNeighborsClassifier as knc
from sklearn.svm import SVC as svc
from sklearn.linear_model import LogisticRegression as lgr
## RandomForest Classifier with monte carlo simulated training set
numpy.random.seed(s)
#df = pd.read_csv("mc_test_data.csv")
#df = pd.read_csv("rndf_filt_data.csv")
df = pd.read_csv("data.csv")
#random forest selected the following columns as most predictive
df = df[['diagnosis','area_worst','concave points_mean','concave points_worst','perimeter_worst','radius_worst']]
#print(df.head())
#df = df.drop(["id","Unnamed: 32"],axis=1)
#df = df.drop(["Unnamed: 0"],axis=1)
df = df.replace({'diagnosis': "M"}, 1)
df = df.replace({'diagnosis': "B"}, 0)
#split dataset for mc seed and testing
df_mc, df = numpy.split(df, [int(.7*len(df))])
#split dataset by class
#df_1 = pd.read_csv("mc_data_M.csv").drop(["Unnamed: 0"],axis=1)
#df_0 = pd.read_csv("mc_data_B.csv").drop(["Unnamed: 0"],axis=1)
df_1 = df_mc.loc[df_mc.diagnosis==1]
df_0 = df_mc.loc[df_mc.diagnosis==0]
df_1 = df_1.drop(["diagnosis"],axis=1)
df_0 = df_0.drop(["diagnosis"],axis=1)
#simulate class 0 data
mc_sim_df_0 = pd.DataFrame()
mc_sim_df_0['diagnosis']= ['0'] * len(df_0.index)
for col in df_0.columns:
col_sim = df_0[col].montecarlo(sims = 2, bust = 0, goal = 0).data
col_sim = col_sim.drop(["original"],axis = 1)
for col2 in col_sim.columns:
mc_sim_df_0[col]=col_sim[col2]
#if(shapiro(mc_sim_df_1[col])[1]>0.05):
#print(kruskal(mc_sim_df_1[col],df_1[col]))
#else:
#print(f_oneway(mc_sim_df_1[col],df_1[col]))
#simulate class 1 data
mc_sim_df_1 = pd.DataFrame()
mc_sim_df_1['diagnosis']= ['1'] * len(df_1.index)
for col in df_1.columns:
col_sim = df_1[col].montecarlo(sims = 2, bust = 0, goal = 0).data
col_sim = col_sim.drop(["original"],axis = 1)
for col2 in col_sim.columns:
mc_sim_df_1[col]=col_sim[col2]
#if(shapiro(mc_sim_df_1[col])[1]>0.05):
#print(kruskal(mc_sim_df_1[col],df_1[col]))
#else:
#print(f_oneway(mc_sim_df_1[col],df_1[col]))
#diag = mc_sim_df_1.append(mc_sim_df_0)['diagnosis']
mc_sim_df = mc_sim_df_1.append(mc_sim_df_0)
#shuffling dataframe for good luck
#mc_sim_df = mc_sim_df.sample(frac=1)
#mc_sim_df['diagnosis']=diag
mc_sim_df.head(20)
#values formatted
labels = df["diagnosis"]
df = df.drop("diagnosis",axis=1)
dfDev, dfTes = numpy.split(df, [int(.7*len(df))])
DDev, DTes = numpy.split(labels, [int(.7*len(labels))])
#DTrn = mc_sim_df['diagnosis']
#dfTrn = mc_sim_df.drop(['diagnosis'], axis = 1)
DTrn = df_mc['diagnosis']
dfTrn = df_mc.drop(['diagnosis'], axis = 1)
scores = []
#run model and test
#randomforest
model = rfc()
model = model.fit(dfTrn.values,DTrn)
pd = model.predict(dfDev)
hit = 0
for i in range(len(pd)):
if(int(pd[i])==int(DDev.iloc[i])):
hit+=1
scores.append(hit/len(pd))
#knn
model = knc()
model = model.fit(dfTrn.values,DTrn)
pd = model.predict(dfDev)
hit = 0
for i in range(len(pd)):
if(int(pd[i])==int(DDev.iloc[i])):
hit+=1
scores.append(hit/len(pd))
#svc
model = svc(kernel="linear")
model = model.fit(dfTrn.values,DTrn)
pd = model.predict(dfDev)
hit = 0
for i in range(len(pd)):
if(int(pd[i])==int(DDev.iloc[i])):
hit+=1
scores.append(hit/len(pd))
#svc
model = svc(kernel="rbf")
model = model.fit(dfTrn.values,DTrn)
pd = model.predict(dfDev)
hit = 0
for i in range(len(pd)):
if(int(pd[i])==int(DDev.iloc[i])):
hit+=1
scores.append(hit/len(pd))
#logistic regression
model = lgr()
model = model.fit(dfTrn.values,DTrn)
pd = model.predict(dfDev)
hit = 0
for i in range(len(pd)):
if(int(pd[i])==int(DDev.iloc[i])):
hit+=1
scores.append(hit/len(pd))
return scores
df.dropna(thresh=8, inplace=True)
df.shape #players=1130
#set missings to 0
df.fillna(value=0, inplace=True)
df.isnull().sum()
#set explanatory and response variables
explanatory = [
col for col in df.columns if col not in ['playerid', 'inducted', 'year']
]
df_exp = df[explanatory]
df_res = df.inducted
#KNN
knn = knc(p=2) #specify Euclidean distance
param_grid = dict(n_neighbors=range(1, 30, 2)) #set up grid for results
kn_accuracy = gscv(knn, param_grid, cv=10,
scoring='accuracy').fit(df_exp, df_res)
param_grid = dict(n_neighbors=range(1, 30, 2)) #set up grid for results
kn_f1 = gscv(knn, param_grid, cv=10, scoring='f1').fit(df_exp, df_res)
param_grid = dict(n_neighbors=range(1, 30, 2)) #set up grid for results
kn_auc = gscv(knn, param_grid, cv=10, scoring='roc_auc').fit(df_exp, df_res)
#Naive Bayes
nb = mnb()
nb_accuracy = cvs(nb, df_exp, df_res, cv=10, scoring='accuracy')
nb_f1 = cvs(nbclass, df_exp, df_res, cv=10, scoring='f1')
sex = 'F'
scaler = StandardScaler()
data_partial = data[data['Sex'] == sex].drop('Sex', axis=1)
# corr_matrix_f, corr_matrix_m = data_f.corr(), data_m.corr()
# plot_corr_matrices(corr_matrix_f, corr_matrix_m)
y = data_partial['EmoState']
X = scaler.fit_transform(data_partial.drop('EmoState', axis=1))
X_train, X_test, y_train, y_test = train_test_split(X,
y,
test_size=0.3,
random_state=71)
models = (('DTC', dtc()), ('SVM', svc(C=10)), ('KNN', knc(n_neighbors=10)),
('SGDC', sgdc()), ('GNBC', gnbc()), ('MLPC',
mlpc(max_iter=1000,
learning_rate='adaptive')))
results = []
names = []
seed = 13
scoring = 'accuracy'
for name, model in models:
kfold = model_selection.KFold(n_splits=10, random_state=seed, shuffle=True)
cv_results = model_selection.cross_val_score(model,
X_train,
y_train,
cv=kfold,
scoring=scoring)
y,
test_size=0.3,
random_state=0)
train_x.head()
train_y.head()
test_x.head()
test_y.head()
# KNN using sklearn
# Importing Knn algorithm from sklearn.neighbors
from sklearn.neighbors import KNeighborsClassifier as knc
# for 3 nearest neighbours
neighbour = knc(n_neighbors=3)
# Fitting with training data
neighbour.fit(train_x, train_y)
# train accuracy
train_acc = np.mean(neighbour.predict(train_x) == train_y)
train_acc # 95.71%
# test accuracy
test_acc = np.mean(neighbour.predict(test_x) == test_y)
test_acc # 93.55%
# for 5 nearest neighbours
neighbour = knc(n_neighbors=5)
import sys import sklearn from classifier_utils import * from sklearn.neighbors import KNeighborsClassifier as knc if __name__ == '__main__' : if len( sys.argv ) > 3 : infilepath , k , dist = sys.argv[ 1: ] data = import_csv( infilepath ) cf = knc( n_neighbors = int( k ) , metric = dist ) stats = cross_validation( data , cf ) print "PARAMS: K=%s , metric=%s" % ( k , dist ) print_stats( stats ) else : print "Usage python %s [csv_file] [neighbors] [distance]" % sys.argv[ 0 ]
b = pd.read_csv('ft.csv',index_col=0)
b = np.array(b)
valid_data = valid_data * b.T
test_data = test_data * b.T
train_data = train_data * b.T
k = 101
nbs = 92
c = np.argsort(b,axis = 0)
for k in range(1,k,1):
d = c[-k:-1,0]
print d
d = list(d)
d.append(c[-1,0])
td = train_data[:,d]
tsd = test_data[:,d]
vld = valid_data[:,d]
#train_data = train_data[0:100,:]
#train_class = train_class[0:100]
for nb in range(91,nbs,1):
clf = knc(n_neighbors = nb)
clf.fit(td,train_class)
print
print k,nb
print 'scr'
print clf.score(tsd,test_class)
sns.countplot(zoo['animal name']) from sklearn.model_selection import train_test_split train,test = train_test_split(zoo,test_size=0.2) train.head() train.shape test.shape from sklearn.neighbors import KNeighborsClassifier as knc neigh = knc(n_neighbors = 3) neigh neigh.fit(train.iloc[:,2:17],train.iloc[:,17]) train_acc = np.mean(neigh.predict(train.iloc[:,2:17])==train.iloc[:,17]) train_acc test_acc = np.mean(neigh.predict(test.iloc[:,2:17])==test.iloc[:,17]) test_acc neigh1 = knc(n_neighbors = 5)
def knn(test_mode=False, custom_data=False):
results = {
'test': {
'accuracy': None,
'confusion': None
},
'train': {
'accuracy': [],
'confusion': []
},
'best_model': None,
'best_acc': 0
}
settings = {
'cv_iter': 100,
'cv_score': 'accuracy',
'n_cv': 3,
'n_folds': 10,
'n_samples': 2000,
}
if test_mode:
settings['n_samples'] = 100
data_path = os.path.join(
Path(__file__).resolve().parents[2], 'data', 'processed')
if custom_data:
data = np.load(os.path.join(data_path, 'vectors.npy'))
X = data.item()['data']
y = data.item()['labels']
X_train = X[:60000, :]
X_test = X[60000:, :]
y_train = y[:60000]
y_test = y[60000:]
del X, y, data
metric = cosine
else:
train_data = os.path.join(data_path, 'training.pt')
test_data = os.path.join(data_path, 'test.pt')
X_train, y_train = convert_ds_to_np(train_data)
X_test, y_test = convert_ds_to_np(train_data)
metric = 'euclidean'
X_train = X_train[:settings['n_samples'], :]
y_train = y_train[:settings['n_samples']]
X_test = X_test[:settings['n_samples'], :]
y_test = y_test[:settings['n_samples']]
# model set up using pipeline for randomized CV
clf = knc(metric=metric, algorithm='brute')
cv_opts = {'n_neighbors': randint(2, 10)}
model = RandomizedSearchCV(clf,
cv_opts,
n_jobs=-1,
n_iter=settings['cv_iter'],
cv=settings['n_cv'],
scoring=settings['cv_score'])
kf = StratifiedKFold(n_splits=settings['n_folds'], shuffle=True)
for i, (train_idx, valid_idx) in enumerate(kf.split(X_train, y_train)):
X_trn = X_train[train_idx]
X_vld = X_train[valid_idx]
y_trn = y_train[train_idx]
y_vld = y_train[valid_idx]
model.fit(X_trn, y_trn)
y_pred = model.predict(X_vld)
this_acc = accuracy_score(y_pred, y_vld)
results['train']['accuracy'].append(this_acc)
results['train']['confusion'].append(confusion_matrix(y_pred, y_vld))
print('[{}/{}]: this={} : best={}'.format(i + 1, settings['n_folds'],
this_acc,
results['best_acc']))
if this_acc > results['best_acc']:
results['best_acc'] = this_acc
results['best_model'] = copy(model)
# get test performance with best model:
y_pred = results['best_model'].predict(X_test)
results['test']['accuracy'] = accuracy_score(y_pred, y_test)
results['test']['confusion'] = confusion_matrix(y_pred, y_test)
return (results)
output.append(-1)
elif x > -0.5 and x < 0.5:
output.append(0)
#%%
data_ml = pd.DataFrame(data2_norm_gen)
data_ml1 = data_ml.drop(['missed_book', "date"], axis=1)
from sklearn.model_selection import train_test_split as tts
x_train1, x_test1, y_train1, y_test1 = tts(data_ml1, output)
from sklearn.neighbors import KNeighborsClassifier as knc
cla = knc()
cla.fit(x_train1, y_train1)
pred = cla.predict(x_test1)
from sklearn.metrics import accuracy_score as ac
acc = ac(y_test1, pred)
#%% Plotting hexbin for data 2 and patterns
day_section = []
for i in data2.hour:
if i >= 0 and i < 3:
# Import required libraries
from sklearn import datasets
from sklearn.model_selection import train_test_split
from sklearn.neighbors import KNeighborsClassifier as knc
from sklearn import metrics
import numpy as np
# Load dataset
iris = datasets.load_iris()
# Feature and label differentiation
x = iris.data
y = iris.target
# Set initial K value
k = 3
# Checks from 3 - 23 to assess best fit K value for the model.
# Iterates through KNN model creation to find best fit.
while k < 23:
x_train, x_test, y_train, y_test = train_test_split(
x, y,
test_size=0.2) # 0.2 value changed to 0.3 to test 30% test size also
knn = knc(n_neighbors=k)
knn.fit(x_train, y_train)
test_prediction = knn.predict(x_test)
accuracy = metrics.accuracy_score(y_test, test_prediction)
print(k, "=", accuracy)
k += 2
# Code run through 10 times with test_size set to 0.2 and a further 10 times with test_size set to 0.3
# Results saved to tables. See Images/k_values.PNG
y = []
for line in infile:
y += [line]
infile.close()
#Get X and Y
train_x = pd.DataFrame(data)
train_y = pd.Series(y)
##########################################################################
#kNN
from sklearn.neighbors import KNeighborsClassifier as knc
from sklearn.metrics import confusion_matrix as cm
#set up and fit
neigh = knc()
neigh.fit(train_x, train_y)
#Test the training set
train_pred = neigh.predict(train_x)
#confusion matrix
confusion = cm(train_y, train_pred)
fun = lambda x: x / sum(x)
cm_perc = np.apply_along_axis(fun, 1, confusion)
# array([[0.60714286, 0.15079365, 0.15873016, 0.08333333],
# [0.09896907, 0.78762887, 0.06597938, 0.04742268],
# [0.21988528, 0.12810707, 0.56978967, 0.08221797],
# [0.23360656, 0.17213115, 0.23155738, 0.36270492]])
import pandas as pd
import sklearn.cross_validation as cv
from sklearn.neighbors import KNeighborsClassifier as knc
from sklearn.preprocessing import scale
df = pd.read_csv('wine.data', index_col=None)
target = df[df.columns[0]]
x = df.drop(df.columns[0], axis=1)
kf = cv.KFold(len(df.index), n_folds=5, shuffle=True, random_state=42)
unscaled_result = list()
for i in xrange(1, 50):
cs_result = cv.cross_val_score(knc(n_neighbors=i), X=x, y=target, cv=kf)
unscaled_result.append(cs_result.mean())
max_unscaled = max(unscaled_result)
print unscaled_result.index(max_unscaled) + 1
print max_unscaled
scaled_x = scale(X=x)
scaled_result = list()
for i in xrange(1, 50):
cs_result = cv.cross_val_score(knc(n_neighbors=i),
X=scaled_x,
y=target,
cv=kf)
scaled_result.append(cs_result.mean())
max_scaled = max(scaled_result)
print scaled_result.index(max_scaled) + 1
print max_scaled
#drop 27 players where all B/P/F stats are missing df.dropna(thresh=8, inplace=True) df.shape #players=1130 #set missings to 0 df.fillna(value=0, inplace=True) df.isnull().sum() #set explanatory and response variables explanatory = [col for col in df.columns if col not in ['playerid', 'inducted','year']] df_exp = df[explanatory] df_res = df.inducted #KNN knn=knc(p = 2) #specify Euclidean distance param_grid = dict(n_neighbors=range(1,30, 2)) #set up grid for results kn_accuracy=gscv(knn, param_grid, cv=10, scoring='accuracy').fit(df_exp, df_res) param_grid = dict(n_neighbors=range(1,30, 2)) #set up grid for results kn_f1=gscv(knn, param_grid, cv=10, scoring='f1').fit(df_exp, df_res) param_grid = dict(n_neighbors=range(1,30, 2)) #set up grid for results kn_auc=gscv(knn, param_grid, cv=10, scoring='roc_auc').fit(df_exp, df_res) #Naive Bayes nb = mnb() nb_accuracy = cvs(nb, df_exp, df_res, cv=10, scoring='accuracy') nb_f1 = cvs(nbclass, df_exp, df_res, cv=10, scoring='f1') nb_auc = cvs(nbclass, df_exp, df_res, cv=10, scoring='roc_auc')
sns.heatmap(cm, annot=True)
plt.xlabel('Predicted')
plt.ylabel('Truth')
print(classification_report(y_test, y_pred))
#applying k-fold cross validation
from sklearn.model_selection import cross_val_score as cvs
accuracies = cvs(estimator=classifier,X=x_train,y=y_train,cv=10)
print(accuracies.mean())
print(accuracies.std())
"""K-NN"""
from sklearn.neighbors import KNeighborsClassifier as knc
classifier=knc(n_neighbors=10,metric='minkowski',p=2)
classifier.fit(x_train, y_train)
#predicting the test set results
y_pred=classifier.predict(x_test)
from sklearn.metrics import confusion_matrix, classification_report
cm=confusion_matrix(y_test, y_pred)
plt.figure(figsize = (5,5))
sns.heatmap(cm, annot=True)
plt.xlabel('Predicted')
plt.ylabel('Truth')
print(classification_report(y_test, y_pred))
valid_class = np.ravel(np.array(valid_class))
print train_data.shape
print test_data.shape
print valid_data.shape
'''
b = pd.read_csv('ft.csv',index_col=0)
b = np.array(b)
valid_data = valid_data * b.T
test_data = test_data * b.T
train_data = train_data * b.T
'''
#train_data = train_data[0:100,:]
#train_class = train_class[0:100]
svc = knc()
nb = range(31,52,5)
svm_parameters = {'n_neighbors':nb}
clf = gsc(svc, svm_parameters)
clf.fit(train_data,train_class)
print clf.grid_scores_
print clf.best_score_
print clf.best_estimator_
print clf.best_params_
import numpy as np
from sklearn.neighbors import KNeighborsClassifier as knc
from sklearn.metrics import accuracy_score
from time import time
X = np.array([[2, 5], [3, 6], [1, 7], [1, 2], [4, 3], [6, 8], [7, 3], [6, 1],
[8, 7], [9, 3]])
Y = np.array([1, 1, 1, 1, 1, 2, 2, 2, 2, 2])
startTime = time()
clf = knc(n_neighbors=3)
clf.fit(X, Y)
pred = clf.predict([[0, 1]])
print(pred)
testX = np.array([[1, 9], [3, 1], [4, 7], [6, 5], [5, 5], [7, 9]])
testY = np.array([1, 1, 1, 2, 2, 2])
pred = clf.predict(testX)
print("Accuracy ",
accuracy_score(testY, pred) * 100)
print("Time ", round(time() - startTime, 3), "sec")
dict(zip(range(nodes_n), [[it] for it in dm.index])))
names = dict(zip(range(nodes_n), dm.index))
G = nx.relabel_nodes(G, names)
mst = nx.minimum_spanning_tree(G)
mst_json = json_graph.node_link_data(mst)
for each in mst_json['links']:
each['type'] = 'mst'
#mst_json['links'] = []
# if you uncomment upper line, this will also display MST lines or it will only display KNN line.
# KNN part
# KNN config
nearest_num = 1
###
M = knc(weights='distance', metric='precomputed')
M.fit(dm.values.tolist(), list(dm.index))
query_dict = {}
for _idx, name in enumerate(mst_json['nodes']):
name = name['id']
query_dict[name] = _idx
for _idx, name in enumerate(list(dm.index)):
temp = M.kneighbors(np.array(dm.values.tolist()[_idx]).reshape(1, -1),
n_neighbors=nearest_num + 1)
for num in range(nearest_num):
links = {
'source': query_dict[name],
'target': query_dict[list(dm.index)[temp[1][0][num + 1]]],
'weight': temp[0][0][num + 1],
G, {_i: list(distance.columns)[_i]
for _i in range(len(G.nodes()))})
# Above graph it isn't have any labels. we need to assign its.
mst_G = nx.mst.minimum_spanning_tree(G)
# generate a new graph which is MST version of ori G.
for edge in mst_G.edges():
draw_data.append(
go.Scatter(
x=[vals[names.index(edge[0]), 0], vals[names.index(edge[1]), 0]],
y=[vals[names.index(edge[0]), 1], vals[names.index(edge[1]), 1]],
mode='lines',
showlegend=False,
line=dict(color=MST_color, width=MST_width)))
# KNN
M = knc(n_neighbors=3, weights='distance', metric='precomputed')
M.fit(distance.values.tolist(), list(distance.index))
# same as before, Model doen't have any label, so below if using whole row to represent sample.
for _idx in range(len(names)):
temp = M.kneighbors(distance.values.tolist()[_idx], n_neighbors=2)[1]
# 2 is mean choose closest one sample, total is 2, but need to consider itself is the nearest.
# temp is a complex structure object.
# last [1:] mean except itself, left -> right is distance nearest -> far.
for _x in temp[0][1:]:
if type(dot_color) == list:
current_color = dot_color[_idx]
else:
current_color = ['#000000']
draw_data.append(
#XTRAINN=np.array(XTRAINN)
#
#xtr,xts,ytr,yts=train_test_split(XTRAINN,Y=YTRAINN,test_size=0.2,random_state=1)
#svc_op.fit(xtrain2,ytrain2)
#acc=[]
#acc=cvs(estimator=svc_op,X=xts,y=yts,cv=3)
#acc.mean()
#
y_stpred_svc=svc_op.predict(xtest2)
#KNN
from sklearn.neighbors import KNeighborsClassifier as knc
knn=knc()
param=[{'n_neighbors':[240,250,230],'p':[2],'metric':['minkowski']}]
gs_knn=GridSearchCV(estimator=knn,param_grid=param,verbose=5,n_jobs=-1,cv=10)
gs_knn.fit(xtrain2,ytrain2)#try later.....this skips fitting on kfold data
gs_knn.best_params_
gs_knn.best_score_
knnf=knc(n_neighbors=230 ,p=2 ,metric='minkowski')
knnf.fit(xtrain2,ytrain2)
200=59.82
300-59.881
250-59.94
#knnf.fit(xtrain2,ytrain2)