test_means = - grid.cv_results_[ 'mean_test_score' ] n_Cs = len(Cs) plt.plot(np.log10(Cs), test_means) #最佳超参数 best_C = grid.best_params_['C'] plt.axvline(np.log10(best_C), color='r', ls='--') plt.legend() plt.xlabel( 'log(C)' ) plt.ylabel( 'logloss' ) pl

这段代码的作用是将一个包含不同参数组合的网格搜索结果中，每个参数组合对应的测试分数的平均值取反后，绘制在以对数为单位的横坐标轴上的折线图中。参数 Cs 是一个参数列表，表示模型中的参数值。代码中的 n_Cs 表示 Cs 列表的长度。

相关问题

绘制训练集和测试集的真实值和预测值图像 train_predict_plot = np.empty_like(data_scaled) train_predict_plot[:, :] = np.nan train_predict_plot[time_steps:len(train_predict) + time_steps, :] = train_predict test_predict_plot = np.empty_like(data_scaled) test_predict_plot[:, :] = np.nan test_predict_plot[len(train_predict) + time_steps * 2 + 1:len(data_scaled) - 1, :] = test_predict plt.figure(figsize=(10, 6)) plt.plot(scaler.inverse_transform(data_scaled)) plt.plot(train_predict_plot) plt.plot(test_predict_plot) plt.legend(['True', 'Train Predict', 'Test Predict']) plt.xlabel('Time/h') plt.ylabel('kwh') plt.show(改写以上代码，使得训练集部分和测试集部分分别绘制在两张图上

下面是改写后的代码，将训练集和测试集的真实值和预测值分别绘制在两张图上：

train_predict_plot = np.empty_like(data_scaled)
train_predict_plot[:, :] = np.nan
train_predict_plot[time_steps:len(train_predict) + time_steps, :] = train_predict

test_predict_plot = np.empty_like(data_scaled)
test_predict_plot[:, :] = np.nan
test_predict_plot[len(train_predict) + time_steps * 2 + 1:len(data_scaled) - 1, :] = test_predict

# 绘制训练集部分真实值和预测值图像
plt.figure(figsize=(10, 6))
plt.plot(scaler.inverse_transform(data_scaled[:len(train_predict)]))
plt.plot(train_predict_plot[:len(train_predict)])
plt.legend(['True', 'Train Predict'])
plt.xlabel('Time/h')
plt.ylabel('kwh')
plt.title('Training Set')
plt.show()

# 绘制测试集部分真实值和预测值图像
plt.figure(figsize=(10, 6))
plt.plot(scaler.inverse_transform(data_scaled[len(train_predict) + time_steps * 2 + 1:]))
plt.plot(test_predict_plot[len(train_predict) + time_steps * 2 + 1:])
plt.legend(['True', 'Test Predict'])
plt.xlabel('Time/h')
plt.ylabel('kwh')
plt.title('Test Set')
plt.show()

import pandas as pd import numpy as np import matplotlib.pyplot as plt import statsmodels.api as sm from arch import arch_model # 读取数据 data = pd.read_csv('三个-负标准化-二分.csv', index_col=0, parse_dates=True) data = data[['F4']] data = data.dropna() # 拆分训练集和测试集 train_data = data[:'2022-06-15'] test_data = data['2022-06-16':] # ARIMA模型 arima_model = sm.tsa.ARIMA(train_data, order=(10, 1, 0)).fit() # GARCH模型 garch_model = arch_model(arima_model.resid, vol='GARCH', p=1, q=1).fit() # 预测 forecast_mean = arima_model.forecast(steps=len(test_data))[0] forecast_vol = garch_model.forecast(horizon=len(test_data)) # 计算置信区间 forecast_upper = forecast_mean + 1.96 * forecast_vol.mean forecast_lower = forecast_mean - 1.96 * forecast_vol.mean # 绘制预测结果 plt.plot(test_data.index, test_data.values, label='Actual') plt.plot(test_data.index, forecast_mean, label='Forecast') plt.fill_between(test_data.index, forecast_upper, forecast_lower, color='gray', alpha=0.2) plt.legend() plt.show() # 数据检验 resid = arima_model.resid / garch_model.conditional_volatility sm.stats.acorr_ljungbox(resid, lags=[10])这段代码的问题

这段代码的主要问题是在导入模块时没有使用正确的语法，应该在每行语句之间添加换行符。另外，最后一行代码没有输出检验结果。正确的代码应该是这样的：

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import statsmodels.api as sm
from arch import arch_model

# 读取数据
data = pd.read_csv('三个-负标准化-二分.csv', index_col=0, parse_dates=True)
data = data[['F4']]
data = data.dropna()

# 拆分训练集和测试集
train_data = data[:'2022-06-15']
test_data = data['2022-06-16':]

# ARIMA模型
arima_model = sm.tsa.ARIMA(train_data, order=(10, 1, 0)).fit()

# GARCH模型
garch_model = arch_model(arima_model.resid, vol='GARCH', p=1, q=1).fit()

# 预测
forecast_mean = arima_model.forecast(steps=len(test_data))[0]
forecast_vol = garch_model.forecast(horizon=len(test_data))

# 计算置信区间
forecast_upper = forecast_mean + 1.96 * forecast_vol.mean
forecast_lower = forecast_mean - 1.96 * forecast_vol.mean

# 绘制预测结果
plt.plot(test_data.index, test_data.values, label='Actual')
plt.plot(test_data.index, forecast_mean, label='Forecast')
plt.fill_between(test_data.index, forecast_upper, forecast_lower, color='gray', alpha=0.2)
plt.legend()
plt.show()

# 数据检验
resid = arima_model.resid / garch_model.conditional_volatility
lb_test = sm.stats.acorr_ljungbox(resid, lags=[10])
print(lb_test)

这样修改后，代码就可以正常执行了。