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期刊图片复现|Python绘制平行坐标轴图展示机器模型超参数优化结果

  • 2026-07-01 05:03:55
期刊图片复现|Python绘制平行坐标轴图展示机器模型超参数优化结果

代码绘制成果展示

论文:Interpretable machine learning-assisted strategy for predicting the mechanical properties of hydroxyl-terminated polyether binders

论文原图
此图展示了机器学习模型的超参数组合与最终测试集决定系数之间的多维映射关系。图中最右侧的颜色条和纵轴表明,模型性能从低到高被分别映射为从深蓝色到深红色的渐变色,即红色线条代表具有高R2得分的模型配置。通过这些红色线条的轨迹可以明显观察到,取得最优性能的超参数组合通常倾向于选择较低的学习率 learning_rate以及较浅的树深度max_depthmin_samples_split的取值分布相对宽泛,而n_estimators则多流向中高值以确保模型获得充分的拟合。这种方式为我们在后续缩小参数搜索空间、进行更精细的模型调优提供了非常明确且有价值的指导方向。
仿图
多种配色

代码解释

第一部分

库的导入以及字体设置
# =========================================================================================# ====================================== 1. 环境设置 =======================================# =========================================================================================import numpy as npimport pandas as pdimport matplotlib.pyplot as pltimport matplotlib.path as mpathimport matplotlib.patches as mpatches

第二部分

颜色库
# =========================================================================================# ======================================2.颜色库=======================================# =========================================================================================COLOR_SCHEMES = {    1: ['#003366''#0066AA''#6699CC''#AACCFF''#E0F0F0''#FFE5D0''#FFB080''#EE6644''#AA0022'],}

第三部分

绘图函数:数据准备与画布创建
# =========================================================================================# ======================================3.绘图函数=======================================# =========================================================================================def plot_hyperparameter_optimization(df, scheme_id):    df_norm = (df - df.min()) / (df.max() - df.min())  #归一化处理,统一映射在0到1的y轴空间上    cols = df.columns  #提取列名作为x轴的垂线    x_coords = np.arange(len(cols))  #生成X轴坐标    #创建画布    fig, ax = plt.subplots(figsize=(146))    colors = COLOR_SCHEMES.get(scheme_id, COLOR_SCHEMES[1])  #提取配色方案    custom_cmap = LinearSegmentedColormap.from_list('custom_scheme', colors)  #创建渐变色    norm = plt.Normalize(df['R-squared_test'].min(), df['R-squared_test'].max())  #映射

第四部分

绘图函数:绘制平滑连线
    #遍历每一次结果    for i in range(len(df)):        y_vals = df_norm.iloc[i].values  # 提取超参数和结果        color = custom_cmap(norm(df['R-squared_test'].iloc[i]))  #获取具体的颜色        verts = []  #贝塞尔曲线的顶点列表        codes = []  #路径指令列表                verts.append(p0)  #添加最初起点坐标                codes.append(mpath.Path.MOVETO)  #移动画笔至此指令        path = mpath.Path(verts, codes)  #生成路径对象        #创建曲线        patch = mpatches.PathPatch(path,facecolor='none',edgecolor=color,lw=1.2,alpha=0.2)        ax.add_patch(patch)  #绘制在子图上

第五部分

绘图函数:绘制坐标轴、刻度线与文本标签
    #坐标轴刻度间隔    step_dict = {        'n_estimators'30,        'learning_rate'0.05,        'max_depth'1,        'min_samples_split'1    }        else:  #R2            ticks_positions = np.linspace(017)  #划分刻度位置            ticks_values = np.linspace(min_val, max_val, 7)  #划分刻度位置数值        #遍历对应的Y轴相对高度与数值刻度        for pos, val in zip(ticks_positions, ticks_values):            #格式化处理刻度            if col == 'learning_rate':                label = f"{val:.2f}"            elif col == 'R-squared_test':                label = f"{val:.4f}"            else:                label = f"{int(np.round(val))}"            #添加文本标注            ax.text(i - 0.02,  #x                    pos,  #y                    label,  #文本                    va='center',  #水平                    ha='right',  #垂直                    fontsize=10,  #大小                    zorder=4)  #层

第六部分

绘图函数:刻度调整,边框设置,颜色条设置,绘图结果保存
    ax.set_xticks(x_coords)  #X轴刻度    ax.set_xticklabels(cols, fontsize=12)  #X轴刻度标注    ax.set_yticks([])  #y轴刻度    ax.set_xlim(0len(cols) - 1)  #x轴范围    ax.set_ylim(01)  #y轴范围    #添加颜色条    cbar = fig.colorbar(sm,ax=ax,pad=0.01,aspect=40)    cbar.ax.tick_params(labelsize=11)  #设置颜色条刻度标注    #子图编号    ax.set_title("(A)",#文本                 loc='left',#位置                 fontsize=18,#字体大小                 fontweight='bold',#加粗                 pad=15)  #间隔

第七部分

执行部分:读取数据,提取特征和目标变量。构建超参数网格字典。实例化并运行GridSearchCV。提取每一次参数组合和其对应的测试得分,调用绘图函数进行绘图。
# =========================================================================================# ======================================4.执行部分=======================================# =========================================================================================if __name__ == "__main__":    df_raw = pd.read_excel(r'data.xlsx')  #读取原始数据    X = df_raw.drop(columns=['Target_ER'])  #特征    y = df_raw['Target_ER']  #目标    #超参数    param_grid = {        'n_estimators'list(range(5030030)),        'learning_rate': [0.050.10.150.20.250.30.350.40.45],        'max_depth'list(range(5131)),        'min_samples_split'list(range(5131))    }    #是否批量绘图    plot_all = True    if plot_all:        for i in COLOR_SCHEMES.keys():            plot_hyperparameter_optimization(df_results, scheme_id=i)    else:        target_scheme = 20        plot_hyperparameter_optimization(df_results, scheme_id=target_scheme) #(注:您结尾的多余符号在此已修复)

如何应用到你自己的数据

1.设置原始数据的保存路径,执行部分:

df_raw = pd.read_excel(r'data.xlsx')  #读取原始数据

2.分离特征数据与目标数据,执行部分:

X = df_raw.drop(columns=['Target_ER'])  #特征y = df_raw['Target_ER']  #目标

3.设置超参数,执行部分:

param_grid = {    'n_estimators'list(range(5030030)),    'learning_rate': [0.050.10.150.20.250.30.350.40.45],    'max_depth'list(range(5131)),    'min_samples_split'list(range(5131))}

4.设置是否进行批量绘图,执行部分:

plot_all = True

5.设置绘图结果的保存地址,绘图函数部分:

plt.savefig(fr'results_{scheme_id}.png', dpi=300,bbox_inches='tight')

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  1. CONNECT:[ UseTime:0.000692s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000836s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000347s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000465s ]
  6. SELECT * FROM `set` [ RunTime:0.000189s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000548s ]
  8. SELECT * FROM `article` WHERE `id` = 492477 LIMIT 1 [ RunTime:0.000965s ]
  9. UPDATE `article` SET `lasttime` = 1783096007 WHERE `id` = 492477 [ RunTime:0.017770s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000337s ]
  11. SELECT * FROM `article` WHERE `id` < 492477 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000584s ]
  12. SELECT * FROM `article` WHERE `id` > 492477 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000494s ]
  13. SELECT * FROM `article` WHERE `id` < 492477 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004639s ]
  14. SELECT * FROM `article` WHERE `id` < 492477 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002878s ]
  15. SELECT * FROM `article` WHERE `id` < 492477 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003740s ]
0.103154s