kaggle練習 手寫體識別

# -*- coding: utf-8 -*-

"""created on sun apr 22 10:25:14 2018
@author: zhangsh
"""import csv
import numpy as np
from sklearn.neighbors import kneighborsclassifier
# list 轉化為 array陣列
def listtoarray(datalist):
m = len(datalist) # 獲取 list 的長度
dataarray = np.zeros((1,m))
for i in range(m):
dataarray[0,i] = int(datalist[i])
return dataarray
# 將彩色轉換為黑白，歸一化。將非0灰度值轉化為1
def datanormalize(data):
m, n = data.shape
for i in range(m):
for j in range(n):
if data[i,j] != 0: 
data[i,j] = 1
return data
# 匯入訓練集
def loadtraindataset():
traindata = 
trainlabel = 
index = 0
with open('train.csv','r') as file:
readcsv = csv.reader(file)
for line in readcsv:
if index == 0 : # 去掉第一行，第一行為說明行
n = len(line) # 一行的長度
index += 1
continue
index += 1
traindata.extend(line[1:])
file.close()
index = index - 1
n = n - 1
trainlabelarray = listtoarray(trainlabel).reshape((index,1))
traindataarray = listtoarray(traindata).reshape((index,n))
return datanormalize(traindataarray), trainlabelarray
# 匯入測試集
def loadtestdataset():
testdata = 
index = 0
with open('test.csv','r') as file:
readcsv = csv.reader(file)
for line in readcsv:
if index == 0: # 去掉第一行
n = len(line) 
index += 1
continue
index += 1
testdata.extend(line[:])
file.close()
index = index - 1 
testdataarray = listtoarray(testdata).reshape((index,n))
return datanormalize(testdataarray)
# 建立模型訓練，並測試
def knnclassifier():
trainingdata, traininglabel = loadtraindataset() # 載入訓練集
testingdata = loadtestdataset() # 載入測試集
testresult = # 建立乙個列表儲存測試結果
print(testingdata.shape)
knn = kneighborsclassifier(algorithm = 'ball_tree') # 建立knn模型
knn.fit(trainingdata, traininglabel) # 訓練模型
i = 1
for line in testingdata: 
predictlabel = knn.predict(line.reshape((1,-1)))
print('**第%d條資料' %i)
i+=1
with open('result.csv','w',newline='') as file: 
writer=csv.writer(file)
writer.writerows(testresult)
if __name__ == "__main__":
knnclassifier()

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