KeyError：“未找到元组类型的键且不是 MultiIndex”SVM

Posted 2023-03-11

【中文标题】KeyError：“未找到元组类型的键且不是 MultiIndex”SVM

【英文标题】：KeyError: 'key of type tuple not found and not a MultiIndex' SVM

【发布时间】：2022-01-01 16:00:54

【问题描述】：

我正在尝试为我的 SVM 模型绘制和创建视觉决策边界。关于数据集和任务的一些背景知识。这是一个二元分类任务，我将新闻文章分类为假的或真实的。我想直观地看到这个决策边界。图代码 sn-p 来自这里：https://medium.com/geekculture/svm-classification-with-sklearn-svm-svc-how-to-plot-a-decision-boundary-with-margins-in-2d-space-7232cb3962c0

我尝试使用 'test_x_vectorize' 作为 x 和 y，但我会得到错误：TypeError: unhashable type: 'csr_matrix'

然后我尝试按照这个线程进行展平，但它给了我同样的问题。 TypeError: unhashable type: 'matrix'

这是我的代码：

# test/train split for X and Y

X_train, X_test, Y_train, Y_test = train_test_split(data['News'], data['Label'], test_size=0.2, random_state=21, shuffle=True)

# Creating the vectorizer using TfidfVectorizer
vectorize = TfidfVectorizer(max_features=5)
vectorize.fit(data['News'])

train_x_vectorize = vectorize.transform(X_train)
test_x_vectorize = vectorize.transform(X_test)

# Creating the SVM model
SVM = svm.SVC(C=1, kernel='linear', degree=3, gamma='auto')
SVM.fit(train_x_vectorize, Y_train)

# Predicting the accuracy on testing data
pred = SVM.predict(test_x_vectorize)

plt.figure(figsize=(10, 8))
# Plotting our two-features-space
sns.scatterplot(x=X_train[:, 0], 
                y=X_train[:, 1], 
                hue=Y_train, 
                s=8);
# Constructing a hyperplane using a formula.
w = SVM.coef_[0]           # w consists of 2 elements
b = SVM.intercept_[0]      # b consists of 1 element
x_points = np.linspace(-1, 1)    # generating x-points from -1 to 1
y_points = -(w[0] / w[1]) * x_points - b / w[1]  # getting corresponding y-points
# Plotting a red hyperplane
plt.plot(x_points, y_points, c='r');

我的回溯错误在这里：

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-8-0535339c273a> in <module>()
     30 plt.figure(figsize=(10, 8))
     31 # Plotting our two-features-space
---> 32 sns.scatterplot(x=X_train[:, 0], 
     33                 y=X_train[:, 1],
     34                 hue=Y_train,

2 frames
/usr/local/lib/python3.7/dist-packages/pandas/core/series.py in _get_values_tuple(self, key)
    954 
    955         if not isinstance(self.index, MultiIndex):
--> 956             raise KeyError("key of type tuple not found and not a MultiIndex")
    957 
    958         # If key is contained, would have returned by now

KeyError: 'key of type tuple not found and not a MultiIndex'

【问题讨论】：

错误指向哪一行？也许编辑并添加完整的错误消息

我添加了回溯错误信息。谢谢。

这里的X_train到底是什么？

X_train 是一个包含新闻文本样本的对象类型

【参考方案1】：

尝试使用

sns.scatterplot(x=X_train.iloc[:, 0], 
                y=X_train.iloc[:, 1], 
                hue=Y_train, 
                s=8);

这将指定您尝试按索引访问