{
  "device": "NVIDIA GB10",
  "compute_capability": "SM121",
  "torch": "2.9.1+cu130",
  "attention": "sage2",
  "resolution": [1344, 768],
  "frames": 124,
  "packed_tokens": 37810,
  "seed": 440420,
  "feature_flag": "H3_SAGE_QKV_LAYOUT=strided_nhd",
  "dataflow": {
    "qkv_input": "projection-strided NHD views with no Q/K/V materialization",
    "qk_transform": "in-place Comfy Kitchen RMSNorm and RoPE on strided views",
    "attention_output": "contiguous Sage2 NHD reshaped as a token-major view for out_proj",
    "removed_copies_per_block": 4
  },
  "isolated_attention_layout": {
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    "strided_nhd_mean_seconds": 0.2602574324118905,
    "speedup": 1.167117314490817,
    "max_abs_difference": 0.0,
    "mean_abs_difference": 0.0
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  "real_block_results": [
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      "block": 0,
      "hnd_p50_seconds": 0.4870640740264207,
      "strided_nhd_p50_seconds": 0.4714779225178063,
      "speedup": 1.0330580728475696,
      "max_abs_difference": 0.0
    },
    {
      "block": 24,
      "hnd_p50_seconds": 0.4879330809926614,
      "strided_nhd_p50_seconds": 0.4716692080255598,
      "speedup": 1.034481523683056,
      "max_abs_difference": 0.0
    },
    {
      "block": 49,
      "hnd_p50_seconds": 0.48766444699140266,
      "strided_nhd_p50_seconds": 0.47158038747147657,
      "speedup": 1.0341067184879458,
      "max_abs_difference": 0.0
    }
  ],
  "sampling_2_step": {
    "hnd_seconds": 52.49690314201871,
    "strided_nhd_seconds": 50.95522483601235,
    "speedup": 1.0302555490819223,
    "checksums": [-276716.375, 727.1075439453125],
    "peak_allocated_bytes_saved": 1185838592,
    "peak_reserved_bytes_saved": 2036334592
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  "sampling_12_step": {
    "component1_hnd_seconds": 301.04568115097936,
    "strided_nhd_seconds": 290.2269145210157,
    "speedup": 1.0372769239814257,
    "latency_reduction": 0.03593729226940101,
    "checksums": [-91481.7890625, 678.401611328125],
    "cumulative_reduction_vs_unfused_310_11_second_baseline": 0.06411616431876277
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  "nsight_block_recapture": {
    "tool": "Nsight Systems 2025.3.2",
    "hnd_kernel_launches": 53,
    "strided_nhd_kernel_launches": 49,
    "removed_kernel_launches": 4,
    "removed_kernels": "three Q/K/V transpose-contiguous copies and one attention-output transpose-contiguous copy",
    "large_bf16_layout_copy_instances_after": 0
  },
  "validation": {
    "isolated_attention": "bit-exact",
    "blocks_0_24_49": "bit-exact",
    "full_50_block_two_step_trajectory": "identical video and audio checksums",
    "canonical_12_step_trajectory": "identical video and audio checksums",
    "deployed_tests": "34 passed"
  },
  "source_artifacts": [
    "benchmarks/gb10-sage-strided-nhd-contract-1344x768-124f-seed440420.json",
    "benchmarks/gb10-sage-strided-nhd-blocks-1344x768-124f-seed440420.json",
    "benchmarks/gb10-component2-layout-hnd-2step.json",
    "benchmarks/gb10-component2-layout-strided-nhd-2step.json",
    "benchmarks/gb10-component2-layout-strided-nhd-12step.json"
  ]
}