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Update PreSamplex.add_combine_node() to avoid adding the trivial combination#311

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Update PreSamplex.add_combine_node() to avoid adding the trivial combination#311
ihincks wants to merge 2 commits intomainfrom
remove-useless-combine

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@ihincks ihincks commented Feb 23, 2026 •
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AI tool use: claude opus 4.6

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ihincks
ihincks commented Feb 23, 2026
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samplomatic/samplex/nodes/inject_noise_node.py

import numpy as np
from qiskit.quantum_info import PauliLindbladMap

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@ihincks ihincks Feb 23, 2026

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unrelated to this PR, not sure how it got past pre-commit

joshuasn
joshuasn previously approved these changes Feb 23, 2026
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nice, lgtm

@joshuasn joshuasn dismissed their stale review February 23, 2026 21:35

didn't look at timings closely..

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ihincks commented Feb 23, 2026

so better, but not crazy

  ┌───────────────────────────┬───────────┬───────────┬─────────────────┐
  │          Metric           │   main    │  branch   │      delta      │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Node counts               │           │           │                 │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Total nodes               │ 1,565     │ 1,149     │ -416 (-27%)     │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ SliceRegisterNode         │ 626       │ 210       │ -416 (-66%)     │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Evaluation nodes          │ 1,354     │ 938       │ -416 (-31%)     │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Evaluation streams        │ 13        │ 9         │ -4 (-31%)       │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Sampling/Collection/other │ unchanged │ unchanged │                 │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Serialization             │           │           │                 │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Serialized size           │ 5,288 KB  │ 5,187 KB  │ -101 KB (-1.9%) │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Serialize time            │ 500 ms    │ 454 ms    │ -46 ms (-9%)    │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Timings                   │           │           │                 │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Build time                │ 4,488 ms  │ 4,556 ms  │ +68 ms (~noise) │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Sample time (100 rand)    │ 225 ms    │ 212 ms    │ -13 ms (-6%)    │
  ├───────────────────────────┼───────────┼───────────┼─────────────────┤
  │ Per randomization         │ 2.25 ms   │ 2.12 ms   │ -0.13 ms (-6%)  │
  └───────────────────────────┴───────────┴───────────┴─────────────────┘

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joshuasn commented Feb 25, 2026

@ihincks still a good improvement, lgtm

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