metrics=['mae', 'acc'])

As an AI language model, I can see that there is a syntax error in this code. The correct syntax should be:

metrics=['mae', 'acc']

This will create a list of evaluation metrics for a machine learning model. "mae" stands for Mean Absolute Error, which measures the average difference between predicted and actual values. "acc" stands for Accuracy, which measures the proportion of correct predictions.

相关问题

import matplotlib as mpl import matplotlib.pyplot as plt import pandas as pd from sklearn.linear_model import LinearRegression import numpy as np from sklearn.metrics import mean_absolute_error from sklearn.metrics import mean_squared_error from sklearn.metrics import r2_score mpl.rcParams['font.sans-serif']=['KaiTi'] mpl.rcParams['axes.unicode_minus']= False data=pd.read_csv('data.csv') #print(data.head) data.dropna(axis=0,how='any',inplace=True) data['单价']=data['单价'].map(lambda d:d.replace('元/平米','')) data['单价']=data['单价'].astype(float) data['总价']=data['总价'].map(lambda e:e.replace('万','')) data['总价']=data['总价'].astype(float) data['建筑面积']=data['建筑面积'].map(lambda p:p.replace('平米','')) data['建筑面积']=data['建筑面积'].astype(float) copy_d=data.copy() copy_d[['室','厅','卫']]=copy_d['户型'].str.extract('(\d+)室(\d+)厅(\d+)卫') copy_d['室']=copy_d['室'].astype(float) new_data=data[['总价','建筑面积']] new_data['室']=copy_d['室'] new_data.dropna(axis=0,how='any',inplace=True) print(new_data) new_data.loc[2583]=[None,180.00,4] data_train=new_data.loc[0:2582] x_list=['建筑面积','室'] ndata_mean=data_train.mean() ndata_std=data_train.std() data_train=(data_train-ndata_mean)/ndata_std x_train=data_train[x_list].values y_train=data_train['总价'].values svr=LinearRegression() svr.fit(x_train,y_train) x_test=((new_data[x_list]-ndata_mean[x_list])/ndata_std[x_list]).values y_test=svr.predict(x_test) print(y_test) new_data['y_pred']=y_test*ndata_std['总价']+ndata_mean['总价'] print(new_data[['总价','y_pred']]) svr_acc=svr.score(x_test,y_test)*100 svr_mae=mean_absolute_error(x_test,y_test) print(svr_mae)

在你的代码中，第 39 行出现了错误，因为 `mean_absolute_error` 函数的第二个参数应该传入真实的目标值 `y_true`，而你传入的是测试集的特征值 `x_test`。正确的代码应该是：

svr_mae = mean_absolute_error(new_data['总价'], new_data['y_pred'])

另外，第 28 行代码中的 `loc` 函数用于添加新行时应该直接写入列名对应的值，而不是使用 `None`，否则会导致类型错误。正确的代码应该是：

new_data.loc[2583] = [np.nan, 180.00, 4]

最后，第 41 行代码中的 `score` 函数用于评估模型的拟合程度，应该传入测试集的特征值 `x_test` 和真实的目标值 `new_data['总价']`，而你传入的是 `y_test`，这也是引起前面错误的原因。正确的代码应该是：

svr_acc = svr.score(x_test, new_data['总价']) * 100

import matplotlib as mpl import matplotlib.pyplot as plt import pandas as pd from sklearn.linear_model import LinearRegression import numpy as np from sklearn.metrics import mean_absolute_error from sklearn.metrics import mean_squared_error from sklearn.metrics import r2_score mpl.rcParams['font.sans-serif']=['KaiTi'] mpl.rcParams['axes.unicode_minus']= False data=pd.read_csv('data.csv') #print(data.head) data.dropna(axis=0,how='any',inplace=True) data['单价']=data['单价'].map(lambda d:d.replace('元/平米','')) data['单价']=data['单价'].astype(float) data['总价']=data['总价'].map(lambda e:e.replace('万','')) data['总价']=data['总价'].astype(float) data['建筑面积']=data['建筑面积'].map(lambda p:p.replace('平米','')) data['建筑面积']=data['建筑面积'].astype(float) copy_d=data.copy() copy_d[['室','厅','卫']]=copy_d['户型'].str.extract('(\d+)室(\d+)厅(\d+)卫') copy_d['室']=copy_d['室'].astype(float) new_data=data[['总价','建筑面积']] new_data['室']=copy_d['室'] new_data.dropna(axis=0,how='any',inplace=True) print(new_data) new_data.loc[2583]=[None,180.00,4] data_train=new_data.loc[0:2582] x_list=['建筑面积','室'] ndata_mean=data_train.mean() ndata_std=data_train.std() data_train=(data_train-ndata_mean)/ndata_std x_train=data_train[x_list].values y_train=data_train['总价'].values svr=LinearRegression() svr.fit(x_train,y_train) x_test=((new_data[x_list]-ndata_mean[x_list])/ndata_std[x_list]).values y_test=((new_data['总价']-ndata_mean['总价'])/ndata_std).values print(y_test) y_pred=svr.predict(x_test) new_data['y_pred']=y_test*ndata_std['总价']+ndata_mean['总价'] print(new_data[['总价','y_pred']]) svr_acc=svr.score(x_test,y_test)*100 svr_mae=mean_absolute_error(x_test,y_pred) print(svr_mae)

这段代码主要是使用线性回归模型对房价进行预测，其中使用了 pandas 和 sklearn 进行数据的处理和模型的建立。具体来说，代码首先读取了一个 csv 文件，并进行了一些数据清洗，然后对数据进行了特征工程，提取出了室、厅、卫等特征，并将其转化为数值类型。接着将数据集分为训练集和测试集，使用训练集对线性回归模型进行训练，最后对测试集进行预测，并计算了模型的精度和误差等指标。