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期刊图片复现|Python绘制相关性热图+特征重要性柱状图组合图

  • 2026-06-30 20:11:35
期刊图片复现|Python绘制相关性热图+特征重要性柱状图组合图

代码绘制成果展示

论文:Alloy design integrating natural language processing and machine learning: breakthrough development of low-cost,high-performance Ni-based single-crystal superalloys

论文原图

此图将相关性分析与随机森林模型的特征重要性排序结合在一起,共同揭示了决定目标Y的关键特征。在相关性矩阵中,通过热图和椭圆斜率展示了各特征与目标之间的线性统计联系。又通过随机森林算法进一步量化了这些因素对Y的实际贡献度/特征重要性。之所以将这两种分析结合起来是因为仅靠成分间的简单线性关系无法精确捕捉复杂的非线性影响 。因此,引入机器学习的特征重要性分析可以从更高维度证明,某特征能显著提升对目标的预测精度 

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 pandas as pdimport matplotlib.pyplot as pltimport numpy as npfrom matplotlib.patches import Ellipse

第二部分

设置颜色库
# =========================================================================================# ====================================== 2. 颜色库 =======================================# =========================================================================================COLOR_SCHEMES = {    1: #00A8A, #9BD89, '#FDFF5', '#FFBB9}

第三部分

绘图函数:创建画布以及左上角相关性的热图框架
# =========================================================================================# ====================================== 3. 绘图函数 =======================================# =========================================================================================def plot_figure(corr_matrix, sorted_features, sorted_importances, scheme_idx, show_plot=False):    scheme_colors = COLOR_SCHEMES.get(scheme_idx, COLOR_SCHEMES[1])  # 提取配色方案    # 创建画布    fig = plt.figure(figsize=(1210))    fig.patch.set_facecolor('white')  # 主图背景色    ax1 = fig.add_axes([0.320.400.550.55])  # 添加第一个子图    # 设置边框显示、粗细    ax1.spines['top'].set_visible(True)    ax1.spines['right'].set_visible(True)    ax1.spines['top'].set_linewidth(1.5)    ax1.spines['right'].set_linewidth(1.5)    ax1.spines['bottom'].set_visible(False)    ax1.spines['left'].set_visible(False)

第四部分

绘图函数:开始绘制上热图的特征名称、相关系数、椭圆形等
    # 遍历相关矩阵行    for i in range(n):        # 遍历列                ax1.add_patch(ell)  # 加到子图上                # 极小值                if abs(r) < 0.005:                    text_str = "0"                else:  # 格式化                    text_str = f"{r:.2f}"                    if text_str == "-0.00":                        text_str = "0"                text_color = 'white' if r < -0.7 else 'black'  # 依据背景色的深浅反转字体颜色                # 添加文本                ax1.text(j,  # x                         i,  # y                         text_str,  # 文本                         ha='center',  # 水平                         va='center',  # 垂直                         fontsize=8.5,  # 大小                         color=text_color)  # 颜色

第五部分

绘图函数:绘制特征重要性柱状图
    # 添加第二个子图绘制重要性柱状图    ax2 = fig.add_axes([0.30.370.500.45])    ax2.set_facecolor('none')  # 背景色    bar_colors = custom_cmap(np.linspace(01len(sorted_importances)))  # 生成一组颜色用作柱子的颜色    # 绘制柱状图    bars = ax2.bar(sorted_features,  # x特征名                   sorted_importances,  # y特征重要性分数                   color=bar_colors,  # 颜色                   edgecolor='black',  # 边框色                   linewidth=0.8,  # 边框线宽                   width=0.6)  # 柱子宽    # 设置轴标注加粗    for label in ax2.get_xticklabels():        label.set_fontweight('bold')    for label in ax2.get_yticklabels():        label.set_fontweight('bold')    # 设置边框    ax2.spines['top'].set_visible(False)    ax2.spines['right'].set_visible(False)    ax2.spines['bottom'].set_linewidth(1.5)    ax2.spines['left'].set_linewidth(1.5)

第六部分

执行部分:包括数据读取、相关性分析、数据划分、标准化处理、网格搜索、模型评估、重要性分析、绘图等
# =========================================================================================# ====================================== 4. 执行部分 =======================================# =========================================================================================if __name__ == "__main__":    file_path = r"data.xlsx"  # 原始数据    df = pd.read_excel(file_path)  # 读取数据    corr_matrix = df.corr()  # 相关性分析    X = df.drop(columns=['Creep life'])  #特征    y = df['Creep life']  #目标    rf_base = RandomForestRegressor(random_state=42)    grid_search = GridSearchCV(estimator=rf_base, param_grid=param_grid,cv=5, scoring='r2', n_jobs=-1, verbose=2)    grid_search.fit(X_train_scaled, y_train)  #拟合网格搜索    best_rf_model = grid_search.best_estimator_  #获取最佳模型    #预测与评估    y_train_pred = best_rf_model.predict(X_train_scaled)        plot_figure(corr_matrix, sorted_features, sorted_importances, scheme_idx=TARGET_SCHEME, show_plot=True)

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:

file_path = r"data.xlsx"  # 原始数据

2.划分数据集,执行部分:

X = df.drop(columns=['Creep life'])  #特征y = df['Creep life']  #目标

3.设置超参数,执行部分:

param_grid = {    'n_estimators'range(100600100),    'max_depth'range(1112),}

4.设置是否要进行批量绘图,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"{scheme_idx}.png", dpi=300,bbox_inches='tight', facecolor='white')

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  1. CONNECT:[ UseTime:0.001151s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001500s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000777s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.035951s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001613s ]
  6. SELECT * FROM `set` [ RunTime:0.000627s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001631s ]
  8. SELECT * FROM `article` WHERE `id` = 492673 LIMIT 1 [ RunTime:0.001169s ]
  9. UPDATE `article` SET `lasttime` = 1783087092 WHERE `id` = 492673 [ RunTime:0.040478s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003235s ]
  11. SELECT * FROM `article` WHERE `id` < 492673 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.015626s ]
  12. SELECT * FROM `article` WHERE `id` > 492673 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000586s ]
  13. SELECT * FROM `article` WHERE `id` < 492673 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006894s ]
  14. SELECT * FROM `article` WHERE `id` < 492673 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003348s ]
  15. SELECT * FROM `article` WHERE `id` < 492673 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.017047s ]
0.281177s