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      "training_presentations": {
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      "update": "One full case /20 frames per optimizer update, cycling only Case1-3",
      "input": "65536x24: normalized XY, Z=0, geometry, full20-step loading history",
      "output": "65536x20 stress",
      "target_scale": 106.5266651084615,
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      "load_scale": 0.0017999999690800905,
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      "loss": "Normalized MSE over material pixels only",
      "optimizer": "AdamW, lr3e-4; inherited P02 schedule: set1e-4 after update6001,3e-5 after12001; weight_decay0, clip1",
      "precision": "FP32/TF32, no AMP",
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        30000,
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      "validation_selection": "Minimum Case4 full20-frame physical relative L2 among six fixed milestones; strict improvement, earlier tie wins; no early stopping or tuning",
      "test_policy": "Case5 evaluated only after40000; fixed40000 and preselected validation-best reported separately; never choose using test",
      "initialization": "Pure untrained P02 initial.pt byte-identical; no trained weights",
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    "scope": "Only1 validation case and1 test case; full loading history known; no causal forecasting claim",
    "time_note": "Official durations use filesystem UTC preflight-to-final-loss and final-loss-to-summary intervals. Training-process UTC includes scheduled validation and checkpoint overhead; initial setup/preflight is excluded. Raw perf_counter and CUDA-event components disagreed with UTC by about7-8% and are reference diagnostics only, not controlled speed evidence; no retrospective scaling applied. Queue wait is separate."
  },
  "scope": "Held-out-case generalization, full loading history known; TRAIN3 / validation1 / test1; fixed40000 and validation-selected checkpoints are distinct"
}