kddcup2015

kddcup2015,二分类，课程逃课预测。写了好久了，突然想起简单整理一下，以备后需。

step1，预处理，利用numpy和pandas库，数值化特征，简单而优雅

#!/usr/bin/env python
# coding=utf-8

import pickle
import pandas as pd
import numpy as np


source_dict={'server':0,'browser':1}
event_dict = {"problem":5,"video":3,"access":1,"wiki":4,"discussion":6,"navigate":2,"page_close":0}


def gen_time_dict():
    rng = pd.date_range('2013-10-27','2014-08-01')
    time_dict = pd.Series(np.arange(len(rng)),index=rng)
    fw = open('data/time_dict.csv','w')
    pickle.dump(time_dict,fw)
    return time_dict


def gen_courseid_dict():
    df = pd.read_csv('data/date.csv',usecols=[0])
    course_map = pd.factorize(df.course_id)[1]
    course_dict = dict(zip(course_map,range(len(course_map))))
    fw = open('data/course_idTrain2.csv','w')
    pickle.dump(course_dict,fw)
    print "course_dict done"
    return course_dict


def gen_object_dict():
    df = pd.read_csv('data/log_train.csv',usecols=[4])
    obj_map = pd.factorize(df.object)[1]
    obj_dict = dict(zip(obj_map,range(len(obj_map))))
    
    df2 = pd.read_csv('data/test/log_test.csv',usecols=[4])
    obj_map2 = pd.factorize(df2.object)[1]
    diff = [w for w in obj_map2 if w not in obj_map]
    obj_dict2 =dict(zip(diff,np.arange(len(obj_map),len(obj_map)+len(diff))))
    
    obj_dict.update(obj_dict2)
    fw = open('data/object_pkl.csv','w')
    pickle.dump(obj_dict,fw)
    print "obj_dict done.."
    return obj_dict


def time_map(x):
    x = x[:10]
    return time_dict[x]


def obj_map(x):
    return obj_dict[x]


def course_map(x):
    return course_dict[x]

time_dict = gen_time_dict()
course_dict= gen_courseid_dict()
obj_dict= gen_object_dict()



def log_trainData():
    print "read log_train.csv "
    df1 = pd.read_csv('data/log_train.csv',converters={1:time_map,4:obj_map})
    print df1.head()
    
    df1.source = df1.source.map(lambda x:source_dict[x])
    df1.event = df1.event.map(lambda x:event_dict[x])
    print df1.head()
    print df1.tail()
    df1.to_csv('data/log_trainData.csv',index=False)
    

def course_Data():
    df2 = pd.read_csv('data/enrollment_train.csv',usecols=[0,2],converters={2:course_map})
    df3 = pd.read_csv('data/date.csv',converters={0:course_map,1:time_map,2:time_map})
    df4 = pd.merge(df2,df3,on='course_id',how='outer')
    df4 = df4.sort_index(by='enrollment_id')
    print df4.tail(10)
    df4.to_csv("data/course_Trainpkl.csv",index=False)

    df1 = pd.read_csv('data/test/enrollment_test.csv',usecols=[0,2],converters={2:course_map})
    df4 = pd.merge(df1,df3)
    df4 = df4.sort_index(by='enrollment_id')
    print df4.tail(10)
    df4.to_csv("data/test/course_Testpkl.csv",index=False)



def log_testData():
    print "read log_test.csv "
    df1 = pd.read_csv('data/test/log_test.csv',converters={1:time_map,4:obj_map})
    print df1.tail(10)
    df1.source = df1.source.map(lambda x:source_dict[x])
    df1.event = df1.event.map(lambda x:event_dict[x])
    print df1.tail(10)
    df1.to_csv('data/test/log_testData.csv',index=False)

log_trainData()
log_testData()
course_Data()

 

2. 使用各种机器学习方法进行建模，预测

#!/usr/bin/env python
# coding=utf-8

import numpy as np
import pandas as pd
from sklearn.ensemble import GradientBoostingClassifier
from sklearn import preprocessing
from sklearn.metrics import roc_auc_score
from sklearn.cross_validation import train_test_split
from sklearn.grid_search import GridSearchCV
from sklearn.svm import SVC 
import pickle


debug=True
if debug:
    N=5000
else:
    N = 20000


class DropOutPredict(object):

    course_dict={}
    def __init__(self):
        print "welcom kdd2015 contest, jkmiao@526588996"

        fr = open("data/coursePkl.pkl")
        self.course_dict = pickle.load(fr)

    def datestr2num(s):
        return pd.to_datetime(s)


    def norm_res(self,x):
        if x<0.0001:
            x=0
        elif x>0.98:
            x=1.0
        return x
    
    def norm_course(self,c):
        return self.course_dict[c]

    def loadTrainData(self):
        df1 = pd.read_csv('./data/log_train.csv',usecols=[0,2,3,4])
        df1.source=pd.factorize(df1.source)[0]
        df1.event=pd.factorize(df1.event)[0]
        df1.object=pd.factorize(df1.object)[0]
        
        gp = df1.groupby("enrollment_id")
        gp2 = df1.groupby(["enrollment_id","source"])

        df2 = pd.read_csv('data/enrollment_train.csv',usecols=[2])
        df2.course_id=pd.factorize(df2.course_id)[0]

        df3 = pd.read_csv('data/truth_train.csv',usecols=[1],names=["drop"])
        data = df1.pivot_table("source",rows="enrollment_id",cols="event",aggfunc="count",fill_value=0)
        
        data["browser"] = gp2.event.count().unstack()[0]
        data["server"] = gp2.event.count().unstack()[1]
        data["course_id"]=df2.course_id
        data["cnt"] = gp.event.count()
        data["std"] = gp.object.std()
        data["var"] =gp.event.var()
        data["mean"] =gp.event.mean()
        data = data.fillna(0)
        print data.head()
        X = data.values
        y = np.ravel(df3["drop"])
        return X,y



    def loadTestData(self):
        df1 = pd.read_csv('data/test/log_test.csv',usecols=[0,2,3,4])
        df1.source = pd.factorize(df1.source)[0]
        df1.event = pd.factorize(df1.event)[0]
        df1.object = pd.factorize(df1.object)[0]
           
        gp = df1.groupby("enrollment_id")
        gp2 = df1.groupby(["enrollment_id","source"])

        df2 = pd.read_csv("data/test/enrollment_test.csv",usecols=[2])
        df2.course_id = pd.factorize(df2.course_id)[0]

        data = df1.pivot_table("source",rows="enrollment_id",cols="event",aggfunc="count",fill_value=0)
        
        data["browser"] = gp2.event.count().unstack()[0]
        data["server"] = gp2.event.count().unstack()[1]
        data["course_id"] = df2.course_id
        data["cnt"] = gp.event.count()
        data["std"] = gp.object.std()
        data["var"] = gp.event.var()
        data["mean"] = gp.event.mean()
        data = data.fillna(0)
        print "test data head():...\n",data.head()
        test = data.values
        return test

    
    def gbdt_clf(self,x_train,x_test,y_train,y_test,test):
        clf = GradientBoostingClassifier(n_estimators=450,learning_rate=0.1,random_state=20)
        clf.fit(x_train,y_train)
        y_pred = clf.predict_proba(x_test)[:,1]
        
        scores = roc_auc_score(y_test,y_pred)
        print "gbdt_clf  scores ... ",scores
        pred = clf.predict_proba(test)[:,1]
        print pred[:5]
        self.saveResult(pred,"data/test/gbdt_clf.csv")


    def svc_clf(self,x_train,x_test,y_train,y_test,test):
        tuned_parameters = [{'kernel':['poly'],'C':[10,500,1200]},
                            {'kernel':['linear'],'C':[200,500,800]}]
        clf = GridSearchCV(SVC(probability=True),tuned_parameters,cv=5,scoring="roc_auc")
        
        # clf = svm.SVC(C=2.0,kernel="rbf",probability=True,random_state=42)
        clf.fit(x_train,y_train)
        print "Best parameters set found : "
        print clf.best_params_

        y_pred = clf.predict_proba(x_test)[:,1]
        scores = roc_auc_score(y_test,y_pred)
        print "svm clf scores...",scores
        pred = clf.predict_proba(test)[:,1]
        self.saveResult(pred,"data/test/svc_res"+str(scores)+".csv")
        return pred[:5]


    def saveResult(self,pred,fileName):
        enrollment_test = pd.read_csv('./data/test/enrollment_test.csv',usecols=[0])
        enrollment_test['drop'] = pred 
        res = enrollment_test[['enrollment_id','drop']];
        print "***"*30
        print res.head()
        res.to_csv(fileName,index=False,header=False)
        


    def drop_predict(self):
        print "loading train data..."
        X,y = self.loadTrainData()
       
        x_train,x_test,y_train,y_test = train_test_split(X,y,test_size=0.23,random_state=20)
        print "loading test data..."
        test = self.loadTestData()
        
        print "moding gbdt_clf..."
        self.gbdt_clf(x_train,x_test,y_train,y_test,test)
        
        x_train,x_test,y_train,y_test = train_test_split(X,y,test_size=0.2,random_state=28)
        print "moding svm_clf ..."
        self.svc_clf(x_train,x_test,y_train,y_test,test)
   
    def em_result(self):
       print "ensemable results..."
       df_gbdt = pd.read_csv("data/test/gbdt_res.csv",header=None,names=["id","drop1"])
       df_svm = pd.read_csv("data/test/svc_res.csv",header=None,usecols=[1],names=["id","drop2"])
       # df_knn = pd.read_csv("data/test/knn_res.csv",header=None,usecols=[1],names=["id","drop3"])
       
       # df_ex1 = pd.read_csv("data/test/gbdt_clf0.861831055542.csv",header=None,usecols=[1],names=["drop4"])
       # df_ex2 = pd.read_csv("data/test/gbdt_clf0.863249041131.csv",header=None,usecols=[1],names=["drop5"])

       # final result
       # df = pd.concat([df_gbdt,df_svm,df_knn,df_ex1,df_ex2],axis=1)
       # df["drop"] = df["drop1"]*0.4+df["drop2"]*0.2+df["drop3"]*0.2+df["drop4"]*0.1+df["drop5"]*0.1
       
       df = pd.concat([df_gbdt,df_svm],axis=1)
       df["drop"] = df.drop1*0.7+df.drop2*0.3
       df["drop"] = map(lambda x:self.norm_res(x),df["drop"])
       print df.head()
       # df.drop(["drop1","drop2","drop3","drop4","drop5"],axis=1,inplace=True)
       df.drop(["drop1","drop2"],axis=1,inplace=True)
       print df.head()
       df.to_csv("data/test/em_res.csv",header=False,index=False)
       


if __name__ == '__main__':
    drop = DropOutPredict()
    drop.drop_predict()
    drop.em_result()
    print "done."  # 准确率召回率AOC值可达84%左右

3， 继续特征工程，加强提取特征，AOC值接近89%

#!/usr/bin/env python
# coding=utf-8

import numpy as np
import pandas as pd
import cPickle as pickle

from sklearn import svm
from sklearn import linear_model
from sklearn.ensemble import RandomForestClassifier
from sklearn.ensemble import GradientBoostingClassifier
from sklearn.preprocessing import scale

from sklearn.cross_validation import train_test_split
from sklearn.metrics import roc_auc_score



def norm( x ):
    if x<0.000001:
        x=0
    elif x>0.96:
        x=1
    return x

def last_time(x):
    return x.max()-x.min()

def loadTrainData():
    df1 = pd.read_csv('data/log_trainData.csv')
    print df1.head()
    print df1.tail()
    df2 = pd.read_csv('data/truth_train.csv',header=None,usecols=[1],names=["drop"])
    df3 = pd.read_csv('data/course_Trainpkl.csv',usecols=[1,2,3])
    
    
    gp = df1.groupby("enrollment_id")

    data = df1.pivot_table("source",rows='enrollment_id',cols="event",aggfunc='count',fill_value=0)
    
    eventdf = gp.event.describe().unstack()

    timedf = gp.time.describe().unstack()
    timedf.drop('count',axis=1)

    sourcedf = gp.source.describe().unstack()
    sourcedf.drop(['count','min','max'],axis=1)

    objectdf = gp.object.describe().unstack()
    objectdf.drop(['count'],axis=1)
    
    # 并连"特征表"
    data = pd.concat([data,eventdf],axis=1)
    data = pd.concat([data,timedf],axis=1)
    data = pd.concat([data,sourcedf],axis=1)
    data = pd.concat([data,objectdf],axis=1)
    
    # 课程特征，持续时间，id号，从？天到？天
    data['dtime'] = gp.time.apply(last_time)
    data["course_id"] = df3["course_id"].values
    data["from"] = df3["from"].values
    data["to"] = df3["to"].values
    
    # 最大最小值规范化，并未什么提升
    # X = MinMaxScaler().fit_transform(X)
    print "origin data: "
    print data.tail() 
    data = data.fillna(0)
    data.to_csv('data/trainData.csv',index=False)
    X = data.values 
    # 去均值后规范化
    X = scale(X)
    # fw = open("data/train/trainData.pkl",'w')
    # pickle.dump(X,fw)
    y = np.ravel(df2['drop'])   
    print "y: ",y[:5]
    return X,y

def loadTestData():
    df1 = pd.read_csv('data/test/log_testData.csv')
    print df1.head()
    df3 = pd.read_csv('data/test/course_Testpkl.csv',usecols=[1,2,3])

    gp = df1.groupby("enrollment_id")

    data = df1.pivot_table("source",rows='enrollment_id',cols="event",aggfunc='count',fill_value=0)
    
    eventdf = gp.event.describe().unstack()

    timedf = gp.time.describe().unstack()
    timedf.drop('count',axis=1)

    sourcedf = gp.source.describe().unstack()
    sourcedf.drop(['count','min','max'],axis=1)

    objectdf = gp.object.describe().unstack()
    objectdf.drop(['count'],axis=1)

    data = pd.concat([data,eventdf],axis=1)
    data = pd.concat([data,timedf],axis=1)
    data = pd.concat([data,sourcedf],axis=1)
    data = pd.concat([data,objectdf],axis=1)

    data['dtime'] = gp.time.apply(last_time)
    data["course_id"] = df3["course_id"].values
    data["from"] = df3["from"].values
    data["to"] = df3["to"].values
    
    # data["cnt"]=gp.size()
    # data["eventstd"] = gp.event.std()
    # data['eventmean'] = gp.event.mean()
    # data['eventmdeian'] = gp.event.median()
    # data['equantile0.25'] = gp.event.quantile(0.25)
    # data['equantile0.75'] = gp.event.quantile(0.75)
    # data['equantilemad'] = gp.event.mad()
    
    print "test data: "
    print data.tail(10)
    data = data.fillna(0)
    # 写入文件，以备后需，直接读取
    data.to_csv('data/test/testData.csv',index=False)
    
    # 也可以直接生成序列化文件
    # fw = open("data/test/testData.pkl",'w')
    # pickle.dump(data,fw)

    test = data.values
    # test = MinMaxScaler().fit_transform(test)
    test = scale(test)
    return test


def svc_clf(x_train,x_test,y_train,y_test,test):
    clf = svm.SVC(kernel='linear',probability=True,random_state=42)
    clf.fit(x_train,y_train)
    y_pred= clf.predict_proba(x_test)[:,1]
    scores = roc_auc_score(y_test,y_pred) # 必须test值写在前面，否则报错
    print "svm scores:...",scores
    pred = clf.predict_proba(test)[:,1]
    saveResult(pred,'data/test/svc_res.csv')


def lr_clf(x_train,x_test,y_train,y_test,test):
    clf = linear_model.LogisticRegression()
    clf.fit(x_train,y_train)
    y_pred = clf.predict_proba(x_test)[:,1]
    scores= roc_auc_score(y_test,y_pred)
    print "lr_clf scores: ",scores
    
    y_pred = map(norm,y_pred)
    score2 = roc_auc_score(y_test,y_pred)
    print "after nomailzied score ... ",score2
    
    pred = clf.predict_proba(test)[:,1]
    saveResult(pred,'data/test/lr_res.csv')

def rf_clf(x_train,x_test,y_train,y_test,test):
    clf = RandomForestClassifier(n_estimators=100)
    clf.fit(x_train,x_train)
    y_pred = clf.predict_proba(x_test)[:,1]
    scores = roc_auc_score(y_test,y_pred)
    pred = clf.predict(test)[:,1]
    print "rf_scores: ",scores
    saveResult(pred,'./data/test/rf_res.csv')


def  gbdt_clf(x_train,x_test,y_train,y_test,test):
    clf = GradientBoostingClassifier(n_estimators=500)
    clf.fit(x_train,y_train)
    y_pred=clf.predict_proba(x_test)[:,1]
    scores = roc_auc_score(y_test,y_pred)
    pred = clf.predict_proba(test)[:,1]
    print "gbdt_clf scores: ",scores
    saveResult(pred,'data/test/gbdt_clf'+str(scores)+'.csv')


def saveResult(pred,fileName):
    # 获取用户id号
    df = pd.read_csv('data/test/enrollment_test.csv',usecols=[0])
    # 加上预测值
    df['drop'] = pred
    print df.head()
    # 写入提交文件
    df.to_csv(fileName,index=False,header=False)

# 将较好的几个结果ensemble一下
def em_res():
    df = pd.read_csv("data/test/gbdt_res.csv",header=None,names=["id","drop"])
    df1 = pd.read_csv("data/test/gbdt_clf0.875919444048.csv",header=None,usecols=[1],names=["drop1"])
    df2 = pd.read_csv("data/test/final_res.csv",header=None,usecols=[1],names=["drop2"])
    df["drop"]  =df["drop"]*0.5+ df1["drop1"]*0.2+df2["drop2"]*0.3
    df["drop"] = df["drop"]
    df.to_csv("data/test/final_res.csv",index=None,header=None)

# 后续使用时，直接读取，加快速度
def loadPickleTrainData():
    df1 = pd.read_csv('data/trainData.csv')
    print df1.head()
    X = df1.values
    # X = scale(X)
    fr2 = open("data/train/trainLabel.txt")
    y = pickle.load(fr2)
    return X,y


def loadPickleTestData():
    df1 = pd.read_csv('data/test/testData.csv')
    test = df1.values
    # test = scale(test)
    return test


def dropPredict():
    em_res()
    print "loading train data..."
    X,y = loadPickleTrainData()
    # X,y = loadTrainData()

    print "loading test data... "
    test = loadPickleTestData()
    # test = loadTestData()

    print "\nmodeling lr..."
    x_train,x_test,y_train,y_test = train_test_split(X,y,test_size=0.31,random_state=148)
    lr_clf(x_train,x_test,y_train,y_test,test)
    
    x_train,x_test,y_train,y_test = train_test_split(X,y,test_size=0.28,random_state=151)
    print "\nmodeling rf..."
    # rf_clf(x_train,x_test,y_train,y_test,test)

    print "\nmodeling gbdt..."
    gbdt_clf(x_train,x_test,y_train,y_test,test)

    print "\nmodeling svm..."
    svc_clf(x_train,x_test,y_train,y_test,test)


if __name__ =="__main__":
    print "start>>>"
    dropPredict()
    print "done"