{
  "status": "rejected",
  "reason": "The exact candidate missed the 6.0 ms isolated go threshold and cannot reliably clear the 1% complete-block gate.",
  "device": "NVIDIA GB10",
  "compute_capability": "SM121",
  "candidate": "Direct strided-NHD BF16 V to Sage2 padded/permuted FP8 V preparation",
  "contract": {
    "tensor_layout": "NHD",
    "head_dimension": 128,
    "scale_max": 2.25,
    "mainloop": "unchanged SageAttention 2.2.0 SM89 INT8-QK/FP8-PV mainloop"
  },
  "correctness": {
    "sequence_lengths": [1, 31, 32, 33, 63, 64, 65, 127, 128, 129, 37760, 37761, 37810],
    "heads": 56,
    "fp8_v": "byte-exact",
    "fp32_v_scale": "byte-exact"
  },
  "canonical_isolated_timing": {
    "sequence": 37810,
    "warmup": 5,
    "iterations": 20,
    "baseline_p50_ms": 10.56272,
    "candidate_p50_ms": 6.392816,
    "preparation_improvement_percent": 39.477,
    "absolute_saving_ms": 4.169904,
    "complete_block_baseline_ms": 458.78,
    "projected_complete_block_improvement_percent": 0.909
  },
  "gate": {
    "go_p50_ms": 6.0,
    "stop_p50_ms": 6.5,
    "result": "reject after the required borderline repeat",
    "complete_block_benchmark": "skipped",
    "trajectory_validation": "skipped",
    "runtime_integration": "not attempted"
  },
  "implementation": {
    "stages": [
      "64-row per-channel BF16 absolute maxima",
      "Sage-compatible approximate-reciprocal FP32 scale finalization",
      "direct E4M3 quantization into Sage2's padded and sequence-permuted layout"
    ],
    "intermediate_bf16_transpose": "removed",
    "production_dispatch": "unchanged"
  },
  "source_artifacts": [
    "benchmarks/gb10-sage2-vprep-randomized.json",
    "benchmarks/gb10-sage2-vprep-canonical-repeat.json"
  ]
}