我尝试可视化多个逻辑回归,但出现上述错误。
我正在练习kaggle的red wine quality数据集。
这里是完整的追溯:
EditText date_birthday = findViewById(R.id.date_birthday);
date_birthday.requestFocus();
下面是可视化代码:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-88-230199fd3a97> in <module>
4 X1, X2 = np.meshgrid(np.arange(start = X_set[:, 0].min() - 1, stop = X_set[:, 0].max() + 1, step = 0.01),
5 np.arange(start = X_set[:, 1].min() - 1, stop = X_set[:, 1].max() + 1, step = 0.01))
----> 6 plt.contourf(X1, X2, classifier.predict(np.array([X1.ravel(), X2.ravel()]).T).reshape(X1.shape),
7 alpha = 0.75, cmap = ListedColormap(('red', 'green')))
8 plt.xlim(X1.min(), X1.max())
/usr/local/lib/python3.6/dist-packages/sklearn/linear_model/base.py in predict(self, X)
287 Predicted class label per sample.
288 """
--> 289 scores = self.decision_function(X)
290 if len(scores.shape) == 1:
291 indices = (scores > 0).astype(np.int)
/usr/local/lib/python3.6/dist-packages/sklearn/linear_model/base.py in decision_function(self, X)
268 if X.shape[1] != n_features:
269 raise ValueError("X has %d features per sample; expecting %d"
--> 270 % (X.shape[1], n_features))
271
272 scores = safe_sparse_dot(X, self.coef_.T,
ValueError: X has 2 features per sample; expecting 11
答案 0 :(得分:1)
您可以添加完整的代码来确定问题所在,但似乎该模型是使用11个特征训练的,但是现在您尝试使用2个特征进行预测。
classifier.predict(np.array([X1.ravel(), X2.ravel()]).T).reshape(X1.shape))
在这里,np.array([X1.ravel(), X2.ravel()]).T).reshape(X1.shape)
的形状在列尺寸(轴= 1)上应该与用于.fit
的训练(classifier
)的原始数组完全相同