VNT Part 4.1: Use vnt_size instead of Base.size

[mhauru]

Addresses https://github.com/TuringLang/DynamicPPL.jl/pull/1180/changes/BASE..4eb33e931853d55400cf6b897bf97f485d6016bd#r2629188957

[github-actions]

Benchmark Report

• this PR's head: cacd42690cda43d1efd01535077eac183418ea3e
• base branch: bb22bc3b7133f1a1f905fcd7c0332ec14154ca7d

Computer Information

Julia Version 1.11.8
Commit cf1da5e20e3 (2025-11-06 17:49 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × AMD EPYC 7763 64-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver3)
Threads: 1 default, 0 interactive, 1 GC (on 4 virtual cores)

Benchmark Results

┌───────────────────────┬───────┬─────────────┬───────────────────┬────────┬───────────────────────────────┬────────────────────────────┬─────────────────────────────────┐
│                       │       │             │                   │        │       t(eval) / t(ref)        │     t(grad) / t(eval)      │        t(grad) / t(ref)         │
│                       │       │             │                   │        │ ─────────┬──────────┬──────── │ ───────┬─────────┬──────── │ ──────────┬───────────┬──────── │
│                 Model │   Dim │  AD Backend │           VarInfo │ Linked │     base │  this PR │ speedup │   base │ this PR │ speedup │      base │   this PR │ speedup │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼──────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│               Dynamic │    10 │    mooncake │             typed │   true │   394.51 │   367.48 │    1.07 │   9.16 │   10.43 │    0.88 │   3613.89 │   3834.05 │    0.94 │
│                   LDA │    12 │ reversediff │             typed │   true │  2666.49 │  2599.85 │    1.03 │   5.09 │    5.22 │    0.97 │  13578.05 │  13583.46 │    1.00 │
│   Loop univariate 10k │ 10000 │    mooncake │             typed │   true │ 60093.34 │ 65941.79 │    0.91 │   5.67 │    5.70 │    0.99 │ 340462.80 │ 376143.57 │    0.91 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼──────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│    Loop univariate 1k │  1000 │    mooncake │             typed │   true │  6023.72 │  5863.78 │    1.03 │   5.65 │    5.87 │    0.96 │  34024.27 │  34409.09 │    0.99 │
│      Multivariate 10k │ 10000 │    mooncake │             typed │   true │ 32470.82 │ 32269.54 │    1.01 │  10.23 │   10.17 │    1.01 │ 332184.69 │ 328128.66 │    1.01 │
│       Multivariate 1k │  1000 │    mooncake │             typed │   true │  3621.95 │  3588.14 │    1.01 │   9.37 │   12.94 │    0.72 │  33923.69 │  46423.98 │    0.73 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼──────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│ Simple assume observe │     1 │ forwarddiff │             typed │  false │     2.62 │     2.66 │    0.99 │   3.86 │    3.91 │    0.99 │     10.12 │     10.38 │    0.98 │
│           Smorgasbord │   201 │ forwarddiff │             typed │  false │  1100.35 │  1084.55 │    1.01 │ 137.12 │  132.49 │    1.03 │ 150877.11 │ 143695.40 │    1.05 │
│           Smorgasbord │   201 │ forwarddiff │       simple_dict │   true │      err │      err │     err │    err │     err │     err │       err │       err │     err │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼──────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│           Smorgasbord │   201 │ forwarddiff │ simple_namedtuple │   true │      err │      err │     err │    err │     err │     err │       err │       err │     err │
│           Smorgasbord │   201 │      enzyme │             typed │   true │  1515.68 │  1481.08 │    1.02 │   7.30 │    6.78 │    1.08 │  11059.65 │  10042.37 │    1.10 │
│           Smorgasbord │   201 │    mooncake │             typed │   true │  1514.10 │  1475.35 │    1.03 │   5.72 │    5.80 │    0.99 │   8653.69 │   8549.77 │    1.01 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼──────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│           Smorgasbord │   201 │ reversediff │             typed │   true │  1501.98 │  1488.95 │    1.01 │ 102.44 │  102.67 │    1.00 │ 153863.75 │ 152865.47 │    1.01 │
│           Smorgasbord │   201 │ forwarddiff │      typed_vector │   true │  1519.43 │  1485.77 │    1.02 │  71.95 │   63.71 │    1.13 │ 109317.81 │  94654.45 │    1.15 │
│           Smorgasbord │   201 │ forwarddiff │           untyped │   true │  1501.98 │  1479.00 │    1.02 │  63.37 │   72.25 │    0.88 │  95185.18 │ 106856.62 │    0.89 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼──────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│           Smorgasbord │   201 │ forwarddiff │    untyped_vector │   true │  1482.95 │  1487.36 │    1.00 │  62.57 │   67.77 │    0.92 │  92792.11 │ 100805.56 │    0.92 │
│              Submodel │     1 │    mooncake │             typed │   true │     3.38 │     3.26 │    1.04 │  10.62 │   10.92 │    0.97 │     35.86 │     35.59 │    1.01 │
└───────────────────────┴───────┴─────────────┴───────────────────┴────────┴──────────┴──────────┴─────────┴────────┴─────────┴─────────┴───────────┴───────────┴─────────┘

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.62%. Comparing base (c917266) to head (cacd426).
⚠️ Report is 11 commits behind head on mhauru/vnt-for-fastldf.

Additional details and impacted files

@@                    Coverage Diff                     @@
##           mhauru/vnt-for-fastldf    #1191      +/-   ##
==========================================================
+ Coverage                   80.56%   80.62%   +0.06%     
==========================================================
  Files                          42       42              
  Lines                        4527     4522       -5     
==========================================================
- Hits                         3647     3646       -1     
+ Misses                        880      876       -4     

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[github-actions]

DynamicPPL.jl documentation for PR #1191 is available at:
https://TuringLang.github.io/DynamicPPL.jl/previews/PR1191/