feat(bokeh): implement pdp-basic

[github-actions]

Implementation: pdp-basic - bokeh

Implements the bokeh version of pdp-basic.

File: plots/pdp-basic/implementations/bokeh.py

Parent Issue: #2922

---

🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

The plot displays a Partial Dependence Plot with a blue line showing the average partial dependence (centered at zero) across Feature X₀ values ranging from 0 to 1. A light blue shaded band represents the 80% confidence interval around the main line. The curve shows a characteristic sigmoid-like pattern: starting low around -4 to -8 at low feature values, rising steeply through the middle range, and plateauing around +1.5 at higher values. A yellow rug plot at the bottom shows the distribution of training data points. The title "pdp-basic · bokeh · pyplots.ai" appears at the top left. A dashed horizontal reference line at y=0 helps interpret relative effects. The legend in the bottom right shows "80% CI", "Average PD", and "Data Distribution". The background is a light gray (#fafafa) with dashed grid lines.

Quality Score: 91/100

Criteria Checklist

Visual Quality (36/40 pts)

• VQ-01: Text Legibility (10/10) - Title, axis labels, and tick marks are all clearly readable with appropriately scaled font sizes for the 4800x2700 canvas
• VQ-02: No Overlap (8/8) - No overlapping text elements anywhere in the plot
• VQ-03: Element Visibility (7/8) - Line width and confidence band are well-sized; rug plot marks could be slightly more prominent
• VQ-04: Color Accessibility (5/5) - Blue (#306998) and yellow (#FFD43B) provide excellent contrast and are colorblind-safe
• VQ-05: Layout Balance (5/5) - Plot fills canvas well with balanced margins
• VQ-06: Axis Labels (1/2) - Labels are descriptive ("Feature X₀ Value", "Partial Dependence (centered)") but lack units
• VQ-07: Grid & Legend (0/2) - Legend placement in bottom-right corner is partially obscured/cramped and could overlap with data in other scenarios

Spec Compliance (25/25 pts)

• SC-01: Plot Type (8/8) - Correct PDP line plot implementation
• SC-02: Data Mapping (5/5) - Feature values on X-axis, partial dependence on Y-axis as specified
• SC-03: Required Features (5/5) - Includes confidence band, rug plot for data distribution, and centering at zero as noted in spec
• SC-04: Data Range (3/3) - All data visible within axes
• SC-05: Legend Accuracy (2/2) - Legend correctly identifies all three elements
• SC-06: Title Format (2/2) - Correctly formatted as "pdp-basic · bokeh · pyplots.ai"

Data Quality (18/20 pts)

• DQ-01: Feature Coverage (7/8) - Shows non-linear relationship well; could benefit from showing a feature with different relationship type
• DQ-02: Realistic Context (7/7) - Uses sklearn's Friedman Add workflow diagram for new prototype discovery #1 dataset with GradientBoostingRegressor - a real ML interpretability scenario
• DQ-03: Appropriate Scale (4/5) - Values are reasonable for a regression problem, though feature range [0,1] is somewhat narrow

Code Quality (9/10 pts)

• CQ-01: KISS Structure (3/3) - Clean linear flow: imports → data → model → plot → save
• CQ-02: Reproducibility (3/3) - Uses np.random.seed(42) and random_state=42
• CQ-03: Clean Imports (2/2) - All imports are used
• CQ-04: No Deprecated API (1/1) - Uses current sklearn and bokeh APIs
• CQ-05: Output Correct (0/1) - Saves as 'plot.png' correctly

Library Features (3/5 pts)

• LF-01: Uses distinctive library features (3/5) - Good use of Band for confidence interval and Span for reference line, ColumnDataSource for data management; could leverage more Bokeh-specific features like hover tooltips

Strengths

• Excellent implementation of all spec requirements including confidence band, rug plot, and zero-centering
• Uses real ML workflow with sklearn's partial_dependence function and GradientBoostingRegressor
• Clean, well-structured code with proper reproducibility (random seeds)
• Good use of Bokeh's Band model for the confidence interval visualization
• Appropriate text scaling for the 4800x2700 canvas size

Weaknesses

• Legend placement in bottom-right could be improved; "top_right" or "top_left" would be safer
• Axis labels lack units (though partial dependence is unitless, could add context like "standardized units")

Verdict: APPROVED