Why I get the X_train_std is not defined

[vokoyo]

May I know why I get the error message -

NameError: name 'X_train_std' is not defined

 
from sklearn.linear_model import LogisticRegression
 
lr = LogisticRegression(C=1000.0, random_state=0)
lr.fit(X_train_std, y_train)
 
plot_decision_regions(X_combined_std,
                      y_combined, classifier=lr,
                      test_idx=range(105,150))
 
plt.xlabel('petal length [standardized]')
plt.ylabel('petal width [standardized]')
plt.legend(loc='upper left')
plt.tight_layout()
 
plt.show()
 
lr.predict_proba(X_test_std[0,:])
 
weights, params = [], []
for c in np.arange(-5, 5):
    lr = LogisticRegression(C=10**c, random_state=0)
    lr.fit(X_train_std, y_train)
    weights.append(lr.coef_[1])
    params.append(10**c)
weights = np.array(weights)
plt.plot(params, weights[:, 0],
         label='petal length')
plt.plot(params, weights[:, 1], linestyle='--',
         label='petal width')
plt.ylabel('weight coefficient')
plt.xlabel('C')
plt.legend(loc='upper left')
plt.xscale('log')
plt.show()
 

[dwblas]

Where do you define it?

[vokoyo]

Look carefully -





from sklearn.model_selection import train_test_split