diff --git a/Chapter_1 Logistic Regression/README.md b/Chapter_01 Logistic Regression/README.md similarity index 100% rename from Chapter_1 Logistic Regression/README.md rename to Chapter_01 Logistic Regression/README.md diff --git a/Chapter_1 Logistic Regression/data.txt b/Chapter_01 Logistic Regression/data.txt similarity index 100% rename from Chapter_1 Logistic Regression/data.txt rename to Chapter_01 Logistic Regression/data.txt diff --git a/Chapter_1 Logistic Regression/lr_test.py b/Chapter_01 Logistic Regression/lr_test.py similarity index 100% rename from Chapter_1 Logistic Regression/lr_test.py rename to Chapter_01 Logistic Regression/lr_test.py diff --git a/Chapter_1 Logistic Regression/lr_train.py b/Chapter_01 Logistic Regression/lr_train.py similarity index 100% rename from Chapter_1 Logistic Regression/lr_train.py rename to Chapter_01 Logistic Regression/lr_train.py diff --git a/Chapter_1 Logistic Regression/test_data b/Chapter_01 Logistic Regression/test_data similarity index 100% rename from Chapter_1 Logistic Regression/test_data rename to Chapter_01 Logistic Regression/test_data diff --git a/Chapter_2 Softmax Regression/SoftInput.txt b/Chapter_02 Softmax Regression/SoftInput.txt similarity index 100% rename from Chapter_2 Softmax Regression/SoftInput.txt rename to Chapter_02 Softmax Regression/SoftInput.txt diff --git a/Chapter_2 Softmax Regression/softmax_regression_test.py b/Chapter_02 Softmax Regression/softmax_regression_test.py similarity index 100% rename from Chapter_2 Softmax Regression/softmax_regression_test.py rename to Chapter_02 Softmax Regression/softmax_regression_test.py diff --git a/Chapter_2 Softmax Regression/softmax_regression_train.py b/Chapter_02 Softmax Regression/softmax_regression_train.py similarity index 100% rename from Chapter_2 Softmax Regression/softmax_regression_train.py rename to Chapter_02 Softmax Regression/softmax_regression_train.py diff --git a/Chapter_3 Factorization Machine/FM_test.py b/Chapter_03 Factorization Machine/FM_test.py similarity index 100% rename from Chapter_3 Factorization Machine/FM_test.py rename to Chapter_03 Factorization Machine/FM_test.py diff --git a/Chapter_3 Factorization Machine/FM_train.py b/Chapter_03 Factorization Machine/FM_train.py similarity index 100% rename from Chapter_3 Factorization Machine/FM_train.py rename to Chapter_03 Factorization Machine/FM_train.py diff --git a/Chapter_3 Factorization Machine/data.txt b/Chapter_03 Factorization Machine/data.txt similarity index 100% rename from Chapter_3 Factorization Machine/data.txt rename to Chapter_03 Factorization Machine/data.txt diff --git a/Chapter_3 Factorization Machine/test_data.txt b/Chapter_03 Factorization Machine/test_data.txt similarity index 100% rename from Chapter_3 Factorization Machine/test_data.txt rename to Chapter_03 Factorization Machine/test_data.txt diff --git a/Chapter_4 SVM/heart_scale b/Chapter_04 SVM/heart_scale similarity index 100% rename from Chapter_4 SVM/heart_scale rename to Chapter_04 SVM/heart_scale diff --git a/Chapter_4 SVM/svm.py b/Chapter_04 SVM/svm.py similarity index 100% rename from Chapter_4 SVM/svm.py rename to Chapter_04 SVM/svm.py diff --git a/Chapter_4 SVM/svm_test.py b/Chapter_04 SVM/svm_test.py similarity index 100% rename from Chapter_4 SVM/svm_test.py rename to Chapter_04 SVM/svm_test.py diff --git a/Chapter_4 SVM/svm_test_data b/Chapter_04 SVM/svm_test_data similarity index 100% rename from Chapter_4 SVM/svm_test_data rename to Chapter_04 SVM/svm_test_data diff --git a/Chapter_4 SVM/svm_train.py b/Chapter_04 SVM/svm_train.py similarity index 100% rename from Chapter_4 SVM/svm_train.py rename to Chapter_04 SVM/svm_train.py diff --git a/Chapter_5 Random Forest/data.txt b/Chapter_05 Random Forest/data.txt similarity index 100% rename from Chapter_5 Random Forest/data.txt rename to Chapter_05 Random Forest/data.txt diff --git a/Chapter_5 Random Forest/random_forests_test.py b/Chapter_05 Random Forest/random_forests_test.py similarity index 100% rename from Chapter_5 Random Forest/random_forests_test.py rename to Chapter_05 Random Forest/random_forests_test.py diff --git a/Chapter_5 Random Forest/random_forests_train.py b/Chapter_05 Random Forest/random_forests_train.py similarity index 100% rename from Chapter_5 Random Forest/random_forests_train.py rename to Chapter_05 Random Forest/random_forests_train.py diff --git a/Chapter_5 Random Forest/test_data.txt b/Chapter_05 Random Forest/test_data.txt similarity index 100% rename from Chapter_5 Random Forest/test_data.txt rename to Chapter_05 Random Forest/test_data.txt diff --git a/Chapter_5 Random Forest/tree.py b/Chapter_05 Random Forest/tree.py similarity index 100% rename from Chapter_5 Random Forest/tree.py rename to Chapter_05 Random Forest/tree.py diff --git a/Chapter_6 BP/bp_test.py b/Chapter_06 BP/bp_test.py similarity index 100% rename from Chapter_6 BP/bp_test.py rename to Chapter_06 BP/bp_test.py diff --git a/Chapter_6 BP/bp_train.py b/Chapter_06 BP/bp_train.py similarity index 100% rename from Chapter_6 BP/bp_train.py rename to Chapter_06 BP/bp_train.py diff --git a/Chapter_6 BP/data.txt b/Chapter_06 BP/data.txt similarity index 100% rename from Chapter_6 BP/data.txt rename to Chapter_06 BP/data.txt diff --git a/Chapter_7 LinearRegression/data.txt b/Chapter_07 LinearRegression/data.txt similarity index 100% rename from Chapter_7 LinearRegression/data.txt rename to Chapter_07 LinearRegression/data.txt diff --git a/Chapter_7 LinearRegression/data_test.txt b/Chapter_07 LinearRegression/data_test.txt similarity index 100% rename from Chapter_7 LinearRegression/data_test.txt rename to Chapter_07 LinearRegression/data_test.txt diff --git a/Chapter_7 LinearRegression/linear_regression_test.py b/Chapter_07 LinearRegression/linear_regression_test.py similarity index 100% rename from Chapter_7 LinearRegression/linear_regression_test.py rename to Chapter_07 LinearRegression/linear_regression_test.py diff --git a/Chapter_7 LinearRegression/linear_regression_train.py b/Chapter_07 LinearRegression/linear_regression_train.py similarity index 100% rename from Chapter_7 LinearRegression/linear_regression_train.py rename to Chapter_07 LinearRegression/linear_regression_train.py diff --git a/Chapter_7 LinearRegression/local_weight_regression.py b/Chapter_07 LinearRegression/local_weight_regression.py similarity index 100% rename from Chapter_7 LinearRegression/local_weight_regression.py rename to Chapter_07 LinearRegression/local_weight_regression.py diff --git a/Chapter_8 RidgeRegression/data.txt b/Chapter_08 RidgeRegression/data.txt similarity index 100% rename from Chapter_8 RidgeRegression/data.txt rename to Chapter_08 RidgeRegression/data.txt diff --git a/Chapter_8 RidgeRegression/data_test.txt b/Chapter_08 RidgeRegression/data_test.txt similarity index 100% rename from Chapter_8 RidgeRegression/data_test.txt rename to Chapter_08 RidgeRegression/data_test.txt diff --git a/Chapter_8 RidgeRegression/ridge_regression_test.py b/Chapter_08 RidgeRegression/ridge_regression_test.py similarity index 100% rename from Chapter_8 RidgeRegression/ridge_regression_test.py rename to Chapter_08 RidgeRegression/ridge_regression_test.py diff --git a/Chapter_8 RidgeRegression/ridge_regression_train.py b/Chapter_08 RidgeRegression/ridge_regression_train.py similarity index 100% rename from Chapter_8 RidgeRegression/ridge_regression_train.py rename to Chapter_08 RidgeRegression/ridge_regression_train.py diff --git a/Chapter_9 CART/sine.txt b/Chapter_09 CART/sine.txt similarity index 100% rename from Chapter_9 CART/sine.txt rename to Chapter_09 CART/sine.txt diff --git a/Chapter_9 CART/test_cart.py b/Chapter_09 CART/test_cart.py similarity index 100% rename from Chapter_9 CART/test_cart.py rename to Chapter_09 CART/test_cart.py diff --git a/Chapter_9 CART/train_cart.py b/Chapter_09 CART/train_cart.py similarity index 100% rename from Chapter_9 CART/train_cart.py rename to Chapter_09 CART/train_cart.py diff --git a/Chapter12_DBSCAN/data.txt b/Chapter_12_DBSCAN/data.txt similarity index 100% rename from Chapter12_DBSCAN/data.txt rename to Chapter_12_DBSCAN/data.txt diff --git a/Chapter12_DBSCAN/dbscan.py b/Chapter_12_DBSCAN/dbscan.py similarity index 100% rename from Chapter12_DBSCAN/dbscan.py rename to Chapter_12_DBSCAN/dbscan.py