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fix: fit the cdf-diff y-axis to the data, fix legends in SBC rank plots - #2173
I found these problems in the SBC rank plots while reviewing PR #2161. They were in main already.
1. cdf-diff clipped large miscalibration. The y-axis was fixed at ±0.5. The empirical CDF can differ from the uniform CDF by up to 1, so the worst-calibrated posteriors all looked the same. The axis is now symmetric and grows in steps of 0.1 to fit every curve, and the uniformity band when it is shown. It never gets smaller than ±0.5, so typical plots don't change. All subplots share one range.
2. Legends with several rank sets. When you compare methods, for example NPE and NLE, the cdf and cdf-diff subplots had no legend, and the hist legend listed the uniformity band once per rank set. All three plot types now show one legend in the first subplot: each rank set, then the band once. handles and labels in legend_kwargs still override the entries.
_sbc_rank_plot
+ ylim = _cdf_diff_ylim(ranks, band if shown) # cdf-diff only
for each rank set, for each parameter
_plot_ranks_as_cdf(..., diff, ylim)
+ legend in the first subplot: rank sets, then the band once
This helps everyone who checks calibration with sbc_rank_plot, and most of all users who compare methods side by side.
Evidence
Before (top) and after (bottom): all ranks 0 with cdf-diff, and two rank sets with cdf.
New tests in tests/plot_test.py:
All ranks 0 with cdf-diff: the deviation is about 0.9, and the axis is now (-1, 1) instead of (-0.5, 0.5).
Uniform ranks, or a hidden band wider than ±0.5: the axis stays (-0.5, 0.5).
Two rank sets, with different or equal labels: the legend lists both, then the band, for all three plot types.
Custom labels in legend_kwargs replace the entries.
I compared 48 renders against PR #2161. Only plots with two rank sets (legend) and the all-zero cdf-diff plots (axis) change. Plots with one set of ranks and small deviations are pixel-identical.
Merge Danger
Door: two-way.
Blast Radius: visual.
Only the drawn SBC rank plots change, and only in the cases above. The public sbc_rank_plot signature stays the same.
… plots
The cdf-diff plot fixed its y-axis at (-0.5, 0.5), but the empirical CDF can differ from the uniform CDF by up to 1. A badly calibrated posterior was clipped at 0.5, so the worst cases looked alike. The axis is now symmetric, at least (-0.5, 0.5), and grows in steps of 0.1 to fit every curve and the band. All subplots share it.
With more than one set of ranks, the cdf and cdf-diff subplots drew no legend, so the rank sets could not be told apart. The first subplot now has a legend, as in the hist plot.
Plots with one set of ranks and deviations below 0.5 are unchanged.
…C legends
With several rank sets, the legend listed the band between the rank sets ("NPE, expected under uniformity, NLE"), and the hist plot listed it once per rank set. The SBC legends now have one entry per label, with the band last.
…arts
`legend_kwargs` with `labels` or `handles` raised a TypeError after the legend helper passed its own handles and labels positionally. The caller's `handles` and `labels` now take precedence again.
The legend helper removed every repeated label, so two rank sets with the same label showed as one entry. It now removes repeats of the uniformity band only.
With `show_uniform_region=False`, the hidden band still widened the cdf-diff axis. The range now counts the band only when it is drawn.
The (-0.5, 0.5) floor now lives in `_cdf_diff_ylim` only; `_plot_ranks_as_cdf` takes the range from its caller.
The legend was rebuilt after every rank set, and custom `labels` in `legend_kwargs` warned about a mismatch on the intermediate legends. The final legend is unchanged.
`_cdf_diff_ylim` computes the uniformity band only when it is drawn.
No actionable comments were generated in the recent review.
Walkthrough
SBC CDF-difference plots now use symmetric y-axis limits calculated from rank curves and, when enabled, the uniformity band. Histogram and CDF plots assemble legends after plotting rank sets. The embedding padding test allows a small tolerance for float32 rounding.
Changes: SBC plotting updates
Layer / File(s)
Summary
CDF-difference range calculation sbi/analysis/plot.py, tests/plot_test.py
CDF-difference plots calculate a symmetric y-axis range from rank curves and, when enabled, the uniformity band. The range has a minimum half-width of 0.5 and increases in 0.1 increments. Tests cover large and small deviations and the effect of hiding the uniformity band.
Histogram and CDF plots assemble legends after drawing rank sets. Legends include rank-set entries and at most one uniformity-band entry. Custom legend handles or labels determine the displayed entries. Existing axis entries remain in the legend.
The embedding padding test compares batched and single-observation outputs with an absolute tolerance of 1e-6 and notes the expected float32 rounding differences.
sbi-dev/sbi#2161: Changes the same SBC CDF and CDF-difference plotting path and shared CDF helper.
sbi-dev/sbi#2119: Changes SBC rank units, CDF band values, and shared CDF helpers used by the y-limit calculation.
Suggested reviewers:bharath0153
Merge Risk: Minimal · up to e2b83
The change adjusts the appearance of SBC rank plots (y-axis range and legends) without altering the public API. No actionable merge-blocking risk remains.
Pre-merge checks: 4
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Title check
The title names both main changes in the PR: the cdf-diff y-axis fit to the data and the SBC rank plot legend fix. It is short, specific, and matches the changeset and the stated objectives. Title is …
Description check
The description covers the problem, the fix for the cdf-diff axis and legends, the new tests, the render comparison, and the merge risk. It does not follow the template closely: it has no 'Does this c…
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Check skipped because no linked issues were found for this pull request.
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Full details: Title check
Explanation
The title names both main changes in the PR: the cdf-diff y-axis fit to the data and the SBC rank plot legend fix. It is short, specific, and matches the changeset and the stated objectives. Title is concise and within normal length.
Full details: Description check
Explanation
The description covers the problem, the fix for the cdf-diff axis and legends, the new tests, the render comparison, and the merge risk. It does not follow the template closely: it has no 'Does this close any issues?' section, and the checklist and AI-assistance disclosure are missing. The core content is present, so the check passes.
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Actionable comments posted: 2
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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Inline comments:
Review comments at @sbi/analysis/plot.py:
- Line 2213: Update the legend construction around plt.legend so custom handles
supplied through legend_kwargs use their own labels when no custom labels are
provided; omit the generated labels in that case while preserving the existing
generated-label behavior otherwise. Add a handles-only regression case
confirming a custom handle retains its label.
- Around line 2209-2210: Update the entries filtering near curves and band to
identify uniformity-band artists independently of their display labels. Keep
rank curves such as those created with `ranks_labels` in `curves` even when
their label matches the uniformity label, and apply deduplication only to band
artists so the legend retains the correct rank-set entry and band color.
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Reviewing files that changed from the base of the PR and between 5394dea and 9cbd406.
Files selected for processing: 2
sbi/analysis/plot.py
tests/plot_test.py
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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.20%. Comparing base (5394dea) to head (e2b83b6). ⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.
…legend handles
The legend helper found the uniformity band by its label, so a rank set labelled "expected under uniformity" replaced the band entry and the real band was dropped. The band artists now carry a gid, and the helper finds them by it.
Custom `handles` in `legend_kwargs` got the generated labels instead of their own. With custom handles, the legend now comes from `legend_kwargs` alone.
A bar plot on axes passed to `sbc_rank_plot` adds a container to the legend handles, which has no gid. The legend helper raised an AttributeError for it; it now checks for an artist first.
…dding test
The batched and the single-observation outputs differ by up to about 2e-7 from float32 summation order. `torch.allclose` defaults to atol=1e-8, so the test failed for about 1 in 20 inputs (16 of 300 seeds locally, and once in the PR CI for Python 3.14). With atol=1e-6, 600 seeds pass for both aggregations.
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This band is drawn once per rank set and ignores show_uniform_region, so with several methods it stacks up and greys out the earlier methods' bars; could we draw it once under if ii == 0 and show_uniform_region:, as the cdf branch does?
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Could we draw the legend once after both loops (if plot_type == "hist" or num_ranks > 1: plt.sca(ax.flat[0]); _sbc_legend(legend_kwargs))? That drops the in-loop checks and the hard-to-read ii == num_ranks - 1 > 0.
…_region
The hist plot drew the uniformity band once per rank set and ignored `show_uniform_region`. With several rank sets the bands stacked and greyed out the earlier bars. The band is now drawn once, when `show_uniform_region` is set, as in the cdf plots.
The subplot legend is now drawn once after the loops, in the first subplot. Plots with one set of ranks are unchanged.
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dgedon
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Summary
I found these problems in the SBC rank plots while reviewing PR #2161. They were in
mainalready.1.
cdf-diffclipped large miscalibration. The y-axis was fixed at ±0.5. The empirical CDF can differ from the uniform CDF by up to 1, so the worst-calibrated posteriors all looked the same. The axis is now symmetric and grows in steps of 0.1 to fit every curve, and the uniformity band when it is shown. It never gets smaller than ±0.5, so typical plots don't change. All subplots share one range.2. Legends with several rank sets. When you compare methods, for example NPE and NLE, the
cdfandcdf-diffsubplots had no legend, and thehistlegend listed the uniformity band once per rank set. All three plot types now show one legend in the first subplot: each rank set, then the band once.handlesandlabelsinlegend_kwargsstill override the entries.This helps everyone who checks calibration with
sbc_rank_plot, and most of all users who compare methods side by side.Evidence
Before (top) and after (bottom): all ranks 0 with
cdf-diff, and two rank sets withcdf.New tests in
tests/plot_test.py:cdf-diff: the deviation is about 0.9, and the axis is now (-1, 1) instead of (-0.5, 0.5).labelsinlegend_kwargsreplace the entries.I compared 48 renders against PR #2161. Only plots with two rank sets (legend) and the all-zero
cdf-diffplots (axis) change. Plots with one set of ranks and small deviations are pixel-identical.Merge Danger
Door: two-way.
Blast Radius: visual.
Only the drawn SBC rank plots change, and only in the cases above. The public
sbc_rank_plotsignature stays the same.