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我試圖在python中進行交叉驗證。我的數據庫大小爲31x9。我想將矩陣拆分爲大小爲28和3的矩陣以進行評估。而且在測試矩陣中,我想將最後兩列替換爲零。我的代碼如下:正確的交叉驗證和python中的矩陣處理
def printme(training):
train_list = []
test_list = []
num_folds = 10
subset_size = len(training)/num_folds
for i in range(num_folds):
testing_this_round = training[i*subset_size:][:subset_size]
training_this_round = training[:i*subset_size] + training[(i+1)*subset_size:]
train_list.append(training_this_round)
new_test = testing_this_round
new_test[0][8] = 0
new_test[1][8] = 0
new_test[2][8] = 0
new_test[0][7] = 0
new_test[1][7] = 0
new_test[2][7] = 0
test_list.append(new_test)
return train_list, test_list
的交叉驗證似乎正常工作,但是當我試圖讓測試矩陣等於零的最後兩個columsn,我entounted問題。看來我的代碼也影響訓練矩陣。我怎樣才能克服這個問題?在返回的矩陣train_list和test_list中,最後兩列都被更改爲零。