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科研绘图 | 基于python绘制多模型+多指标对比环形柱状图

  • 2026-06-29 18:05:16
科研绘图 | 基于python绘制多模型+多指标对比环形柱状图

在科研论文中,模型性能对比图是展示实验结果的核心手段。常见的柱状图、雷达图虽然直观,但在呈现多个模型、多项指标时往往显得拥挤或不够美观。本文介绍一种"环形柱状图"(Radial Bar Chart)的 Python 绘制方法,利用极坐标与 matplotlib 的 barh 结合,让数据从圆心向外层层展开,视觉上更具层次感与冲击力,尤其适合机器学习模型的性能对比场景。

一、极坐标下的环形柱

核心思路是将 matplotlib 的 projection='polar'(极坐标)模式与 barh(横向柱状图)结合。barh 的 y 轴控制每个环的半径位置,x 轴(实际是角度)控制柱子的长度。inner_radius = 3.0 定义内圈半径,使圆心区域留白,营造环形感;bar_height 控制每个环的厚度;theta_values 将数值线性映射到角度范围(0 到 1.5π,约 270°),留出缺口让图表更透气。

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

df = pd.read_csv('model_metrics.csv')
labels = df['Model'].values
values = df['Accuracy'].values

colors = ['
#4E342E''#BF360C''#F57C00''#FBC02D''#DCE775''#7CB342']
N = len(labels)
bar_height = 0.65
inner_radius = 3.0
y_pos = np.arange(N) + inner_radius
max_ref = 1.1
theta_values = (values / max_ref) * (1.5 * np.pi)

fig, ax = plt.subplots(figsize=(1010), subplot_kw={'projection''polar'})
ax.set_theta_zero_location("N")
ax.set_theta_direction(-1)


二、标签对齐

极坐标中文字右对齐的实现有一个精巧的细节:极坐标下弧长 s = r × θ,要保证标签与柱子起点的物理距离恒定,θ 必须随半径 r 变化。具体公式为 angle_offset = -(固定距离 / 半径)。这样无论标签落在内圈还是外圈,与柱子的间距都完全一致,整张图的对齐感非常舒适,远比直接给每个标签设置固定 x 坐标更好。

fixed_distance_offset = 0.4# 控制标签与柱子起点的物理距离

for i, (bar, value, label) in enumerate(zip(bars, values, labels)):
    label_text = f"{label} = ({value:.3f})"
    radius = y_pos[i]
    angle_offset = - (fixed_distance_offset / radius)

    ax.text(x=angle_offset, y=radius, s=label_text,
            ha='right', va='center',
            fontsize=12, fontname='Times New Roman', color='black')

三、多子图布局:四种配色一键切换

进阶版脚本将四个指标(Accuracy、Precision、Recall、F1-Score)以 2×2 子图布局呈现在一张画布上,同时提供 Nature、Lancet、Science、用户自定义四套配色方案,通过循环自动生成四张不同风格的大图。这种设计在科研投稿时尤为实用——只需选择合适的配色包,就能快速匹配目标期刊的视觉风格,大幅提升制图效率。

color_palettes = {
'Nature_NPG': ['#3C5488''#00A087''#4DBBD5''#E64B35''#F39B7F''#8491B4'],
'Lancet': ['#00468B''#ED0000''#42B540''#0099B4''#925E9F''#FDAF91'],
'Science_AAAS': ['#374E55''#DF8F44''#00A1D5''#B24745''#79AF97''#6A6599'],
'User_Style': ['#B22222''#00468B''#228B22''#008B8B''#800080''#FA8072']
}

fig, axes = plt.subplots(22, figsize=(1515), subplot_kw={'projection''polar'})
for idx, metric in enumerate(metrics):
    ax = axes.flatten()[idx]
    values = df[metric].values
    theta_values = (values / max_ref) * (1.5 * np.pi)
    ax.barh(y_pos, theta_values, height=bar_height, color=colors[:N], align='center', left=0)

四、中心图例:多子图共用的统一图例

多子图场景下,为每个子图单独添加图例会显得冗余。更优的做法是使用 fig.legend()(而非 ax.legend())将图例置于整张画布的几何中心。关键参数是 loc='center' 配合 bbox_to_anchor=(0.5, 0.5),将图例锁定在画布正中央,同时通过 transform=fig.transFigure 确保坐标参考系是整个 Figure 而非某个子图。图例句柄的顺序需要与环的排列顺序对应反转,让最外圈模型显示在图例最上方,与视觉层次保持一致。

legend_handles = [mpatches.Patch(color=c, label=l)
for c, l in zip(reversed(current_colors), reversed(fixed_models))]

font_prop = {'family''Times New Roman''size'13}

fig.legend(handles=legend_handles,
           loc='center',
           bbox_to_anchor=(0.50.5),
           frameon=False,
           title="Model Comparison",
           title_fontsize=14,
           prop=font_prop,
           handlelength=1.5, handleheight=1.5)

plt.subplots_adjust(wspace=0.4, hspace=0.35)
plt.savefig(f'CenterLegend_{palette_name}.jpeg', dpi=600, format='jpeg', bbox_inches='tight')

五、最终结果

最终输出的图表以环形阵列展示六个模型的性能,从圆心向外依次递增,四项指标分据四个象限,中心图例统一标注模型与颜色映射关系。整套方案的优势在于:数据处理逻辑极简(只需一个排序好的 CSV)、绘图参数高度可复用(配色、子图数量均可配置)、输出质量可达期刊级别的 600 DPI。只需替换自己的 CSV 数据文件即可完整出图。

现在绘图代码都不支持免费获取了,20/篇文章。同时欢迎加入小编科研绘图VIP群,258/年,所有科研绘图相关文章代码免费获取,涵盖机器学习模型(回归和分类)的shap分析、还有各种如皮尔逊分析等相关的图,以及期刊复现图,源代码直接复制或者打开就能绘图。同时进群赠送SHAP科研分析软件5.0,且免费更新使用。VX:GISyanjiushengya!!!

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  1. CONNECT:[ UseTime:0.001146s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001627s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000759s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002426s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001400s ]
  6. SELECT * FROM `set` [ RunTime:0.013288s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001819s ]
  8. SELECT * FROM `article` WHERE `id` = 486952 LIMIT 1 [ RunTime:0.004436s ]
  9. UPDATE `article` SET `lasttime` = 1783067839 WHERE `id` = 486952 [ RunTime:0.007829s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000733s ]
  11. SELECT * FROM `article` WHERE `id` < 486952 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001283s ]
  12. SELECT * FROM `article` WHERE `id` > 486952 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001140s ]
  13. SELECT * FROM `article` WHERE `id` < 486952 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002903s ]
  14. SELECT * FROM `article` WHERE `id` < 486952 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.025444s ]
  15. SELECT * FROM `article` WHERE `id` < 486952 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.030664s ]
0.251184s