import numpy as np import pandas as pd from sklearn.svm import SVC from sklearn.datasets import load_iris data = load_iris() X = data['data'] y = data['target'] X = X[y != 2, 0:2] y = y[y != 2] X -= np.mean(X, axis=0) X /= np.std(X, axis=0, ddof=1) m = len(X) data = int(0.8 * m) X_train, X_test = np.split(X, [data]) y_train, y_test = np.split(y, [data]) model_svm = SVC(C=1.0, kernel='linear') model_svm.fit(X_train, y_train) Accuracy = model_svm.score(X_test, y_test) print('Linear Accuracy = ', Accuracy) X_test_h = model_svm.predict(X_test)
时间: 2024-04-17 22:25:59 浏览: 177
您好!根据您提供的代码,您正在使用支持向量机(SVM)模型对鸢尾花数据集进行分类。您已经将数据集加载并进行了一些预处理操作,接下来您使用线性核函数训练了一个SVM模型,并计算了在测试集上的准确率。
现在,您似乎想要使用模型对测试集中的样本进行预测。根据代码,您可以通过以下方式来实现:
```python
X_test_h = model_svm.predict(X_test)
```
这将使用训练好的SVM模型对测试集中的样本进行预测,并将预测结果存储在`X_test_h`中。请注意,这里的命名`X_test_h`可能会让人感到困惑,因为它的名字中包含了"h",但实际上它是存储预测结果的变量。
如果您有任何其他问题,请随时告诉我!
相关问题
在Python中想运行from sklearn.model_selection import train_test_split from sklearn.decomposition import PCA import pandas as pd from sklearn import svm import numpy as np import math import matplotlib.pyplot as plt import matplotlib as mpl from matplotlib import colors from sklearn.model_selection import train_test_split from sklearn import datasets from matplotlib.colors import ListedColormap from sklearn.svm import SVC from sklearn.preprocessing import StandardScaler from sklearn.model_selection import StratifiedShuffleSplit,StratifiedKFold from sklearn.model_selection import GridSearchCV from sklearn.model_selection import GridSearchCV, LeaveOneOut, cross_val_predict from sklearn.model_selection import KFold from sklearn.linear_model import LogisticRegression from sklearn.naive_bayes import GaussianNB from sklearn.neighbors import KNeighborsClassifier from sklearn import svm from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import roc_auc_score from sklearn.metrics import roc_auc_score import math import datetime import multiprocessing as mp from sklearn.ensemble import StackingClassifier from sklearn.pipeline import make_pipeline from sklearn.svm import LinearSVC import random怎么操作
要在Python中运行这些代码,你需要确保已经安装了相应的包。大多数包都可以使用`pip`进行安装。
首先,在命令行中运行以下命令来安装所需的包:
```bash
pip install scikit-learn pandas matplotlib numpy
```
然后,在你的Python脚本中导入所需的库:
```python
from sklearn.model_selection import train_test_split
from sklearn.decomposition import PCA
import pandas as pd
from sklearn import svm
import numpy as np
import math
import matplotlib.pyplot as plt
import matplotlib as mpl
from matplotlib import colors
from sklearn.model_selection import train_test_split
from sklearn import datasets
from matplotlib.colors import ListedColormap
from sklearn.svm import SVC
from sklearn.preprocessing import StandardScaler
from sklearn.model_selection import StratifiedShuffleSplit, StratifiedKFold
from sklearn.model_selection import GridSearchCV
from sklearn.model_selection import GridSearchCV, LeaveOneOut, cross_val_predict
from sklearn.model_selection import KFold
from sklearn.linear_model import LogisticRegression
from sklearn.naive_bayes import GaussianNB
from sklearn.neighbors import KNeighborsClassifier
from sklearn.tree import DecisionTreeClassifier
from sklearn.ensemble import RandomForestClassifier
from sklearn.metrics import roc_auc_score
import datetime
import multiprocessing as mp
from sklearn.ensemble import StackingClassifier
from sklearn.pipeline import make_pipeline
from sklearn.svm import LinearSVC
import random
```
请确保在运行这些代码之前,已经安装了所需的Python库。如果遇到任何问题,请确保已正确安装这些库,并且版本与代码兼容。
import numpy as np import pandas as pd from sklearn.svm import SVC from sklearn.datasets import load_iris data = load_iris() X = data['data'] y = data['target'] X = X[y != 2, 0:2] y = y[y != 2] X -= np.mean(X, axis=0) X /= np.std(X, axis=0, ddof=1) m = len(X) data = int(0.8 * m) X_train, X_test = np.split(X, [data]) y_train, y_test = np.split(y, [data]) model_svm = SVC(C=1.0, kernel='linear') model_svm.fit(X_train, y_train) Accuracy = model_svm.score(X_test, y_test) print('Linear Accuracy = ', Accuracy) X_test_h = model_svm.predict(X_test) 解释
这段代码是一个简单的支持向量机(SVM)分类器的示例。它使用了scikit-learn库中的SVC类来构建一个线性核的SVM模型,并使用iris数据集进行训练和测试。
首先,导入了必要的库,包括numpy、pandas、sklearn.svm和sklearn.datasets。然后,通过调用load_iris函数加载iris数据集,并将数据集分为特征向量X和目标向量y。
接下来,通过过滤掉目标向量中的类别2,将数据集限定为两个类别,并选择了前两个特征作为输入特征(X)。
然后,对输入特征进行标准化处理,通过减去均值并除以标准差来使所有特征具有相同的尺度。
接着,计算数据集的长度m,并将80%的数据用于训练,20%用于测试,通过np.split函数将数据集分割为训练集和测试集,并分割相应的目标向量。
然后,创建一个SVC对象model_svm,设置C参数为1.0并选择线性核函数。
接下来,使用训练集拟合模型,即调用model_svm的fit方法,并计算模型在测试集上的准确率,通过调用model_svm的score方法。
最后,使用训练好的模型对测试集进行预测,通过调用model_svm的predict方法,并将预测结果存储在变量X_test_h中。
你可以通过打印Accuracy来查看模型在测试集上的准确率。
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