Python feature_namesエラー

Python feature_namesエラー

jupyternotebook上でPythonを実行しています。 リンク内容このリンク先を参考にし、機械学習においてラッパー法を適用するコードを書いています。




import pandas as pd
import numpy as np
import seaborn as sns
import matplotlib.pyplot as plt
from sklearn.model_selection import train_test_split
import sklearn 
from sklearn.neighbors import KNeighborsClassifier
from sklearn import preprocessing

pima = pd.read_csv('data3/pima.csv' )
pima = pima.replace("No",0)
pima = pima.replace("Yes",1)

knn = KNeighborsClassifier(n_neighbors=4)
from mlxtend.feature_selection import SequentialFeatureSelector as SFS
sfs1 = SFS(knn, ## 使う学習器
           k_features=3, #特徴をいくつまで選択するか
           forward=True, #Trueでforward selectionになる。Falseでback
           floating=False, #後に説明するが、forward selectionの亜種を行うためのもの。
           verbose=2, #実行時のlogをどれだけ詳しく表示するか
           scoring='accuracy', ## 評価指標
           cv=5) #クロスバリデーション

X = preprocessing.scale(pima[["npreg","glu","bp","skin","bmi","ped","age"]])
y = pima.type

sfs1 =, y)
for i in sfs1.k_feature_idx_:
    print(i,'番目 ',pima.feature_names[i])


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