Remove vector_getranges, vector_getrange, and getranges

[penelopeysm]

All of these functions were used to identify which part of a flattened parameter vector belonged to a particular VarName. In a happy coincidence, it turned out that I reinvented this wheel as part of FastLDF, so we can now get rid of these and just directly check the LDF's internal fields (not ideal, but it's contained within DPPL so not too bad, and I'm not keen to expose a public interface to this NT + Dict hydra).

[github-actions]

Benchmark Report

• this PR's head: e0cdf631864d95eee8709dd5dd033535627cd96a
• base branch: 5962903c27b58879b6f861cbcc2b1790a641d2ad

Computer Information

Julia Version 1.11.7
Commit f2b3dbda30a (2025-09-08 12:10 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 │   339.53 │    393.45 │    0.86 │  11.32 │    9.21 │    1.23 │   3843.77 │   3622.50 │    1.06 │
│                   LDA │    12 │ reversediff │             typed │   true │  2428.99 │   2643.22 │    0.92 │   5.09 │    4.95 │    1.03 │  12366.76 │  13090.53 │    0.94 │
│   Loop univariate 10k │ 10000 │    mooncake │             typed │   true │ 97155.58 │ 105054.39 │    0.92 │   3.83 │    3.90 │    0.98 │ 371698.07 │ 409458.16 │    0.91 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼───────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│    Loop univariate 1k │  1000 │    mooncake │             typed │   true │  7168.15 │   8110.99 │    0.88 │   4.87 │    4.67 │    1.04 │  34943.90 │  37846.66 │    0.92 │
│      Multivariate 10k │ 10000 │    mooncake │             typed │   true │ 30642.91 │  32172.73 │    0.95 │   9.93 │   10.18 │    0.98 │ 304405.60 │ 327610.99 │    0.93 │
│       Multivariate 1k │  1000 │    mooncake │             typed │   true │  3349.07 │   3580.07 │    0.94 │   9.30 │    9.25 │    1.01 │  31143.60 │  33118.15 │    0.94 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼───────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│ Simple assume observe │     1 │ forwarddiff │             typed │  false │     2.55 │      2.72 │    0.94 │   3.88 │    3.99 │    0.97 │      9.89 │     10.86 │    0.91 │
│           Smorgasbord │   201 │ forwarddiff │             typed │  false │  1114.38 │   1208.02 │    0.92 │ 123.48 │  127.29 │    0.97 │ 137602.48 │ 153771.54 │    0.89 │
│           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 │  1558.73 │   1676.66 │    0.93 │   6.92 │    5.80 │    1.19 │  10780.45 │   9726.13 │    1.11 │
│           Smorgasbord │   201 │    mooncake │             typed │   true │  1997.83 │   1696.38 │    1.18 │   4.11 │    5.37 │    0.76 │   8202.58 │   9108.97 │    0.90 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼───────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│           Smorgasbord │   201 │ reversediff │             typed │   true │  1696.20 │   1670.30 │    1.02 │  81.49 │   89.84 │    0.91 │ 138229.66 │ 150067.01 │    0.92 │
│           Smorgasbord │   201 │ forwarddiff │      typed_vector │   true │  1549.35 │   1673.52 │    0.93 │  58.27 │   54.39 │    1.07 │  90276.01 │  91023.23 │    0.99 │
│           Smorgasbord │   201 │ forwarddiff │           untyped │   true │  1542.13 │   1663.30 │    0.93 │  60.67 │   59.97 │    1.01 │  93567.18 │  99744.93 │    0.94 │
├───────────────────────┼───────┼─────────────┼───────────────────┼────────┼──────────┼───────────┼─────────┼────────┼─────────┼─────────┼───────────┼───────────┼─────────┤
│           Smorgasbord │   201 │ forwarddiff │    untyped_vector │   true │  1545.01 │   1671.95 │    0.92 │  59.69 │   58.38 │    1.02 │  92219.62 │  97607.78 │    0.94 │
│              Submodel │     1 │    mooncake │             typed │   true │     6.96 │      7.10 │    0.98 │   5.00 │    5.25 │    0.95 │     34.79 │     37.31 │    0.93 │
└───────────────────────┴───────┴─────────────┴───────────────────┴────────┴──────────┴───────────┴─────────┴────────┴─────────┴─────────┴───────────┴───────────┴─────────┘

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.95%. Comparing base (5962903) to head (e0cdf63).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/DynamicPPLMarginalLogDensitiesExt.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1175       +/-   ##
===========================================
+ Coverage   35.34%   78.95%   +43.60%     
===========================================
  Files          41       41               
  Lines        3907     3896       -11     
===========================================
+ Hits         1381     3076     +1695     
+ Misses       2526      820     -1706     

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[mhauru]

Looks good if tests pass