masterpieceexternal/gpt-oss-20b-lmsys-layer2-expert-traces-600k-10msps

GPT-OSS-20B LMSYS Layer-2 Expert Power Traces — 600k tokens at 10 MSPS

This dataset contains real power/current traces captured from an NVIDIA H100 PCIe system while running GPT-OSS-20B decode on LMSYS prompts. The capture target is layer 2 MoE expert execution only; earlier/later transformer work is executed off-trace to avoid wasting acquisition time.

Capture summary

• —Model: openai/gpt-oss-20b
• —Target layer: 2
• —Captured region: target_layer_experts_only
• —Prompts: LMSYS Chat, English-filtered prompt plan
• —Accepted decode tokens: 600,000
• —Prompts touched: 9,375
• —Experts per token: 4
• —Total expert windows: 2,400,000
• —Unique experts observed: 32 / 32
• —Trace sample rate: 10 MSPS
• —Samples per capture: 100,000
• —Capture duration: 10 ms
• —Trace dtype: float16
• —Trace shape: (100000,)
• —Approximate trace payload size: 120.08 GB

Layout

traces/shard_XXXXXX/step_YYYYYY.npy      # float16 power trace, shape (100000,)
records/shard_XXXXXX/step_YYYYYY.json    # per-token metadata and expert window bounds
timelines/shard_XXXXXX/...               # periodic timing/timeline artifacts
prompt_plan.jsonl                        # deterministic prompt plan used by the run
capture_meta.json                        # capture summary and expert counts
run_state.json                           # final committed run state
layer_windows.rebuilt.jsonl              # flattened expert-window index from audit

Each record contains:

• —global_step
• —prompt_plan_index
• —token_in_prompt
• —hit_experts
• —trace_file
• —trace_stats
• —layer_windows, with expert_idx, sample_start, sample_end, and millisecond boundaries
• —scope configuration including adc_freq_effective, adc_decimate, and adc_samples

Health/audit status

Final audit status:

• —committed records: 600,000
• —missing trace files: 0
• —trace dtypes: float16: 600000
• —trace shapes: (100000,): 600000
• —loaded trace sample count during audit: 1,000
• —audit warnings: 0
• —audit errors: 0

A separate visual spot check sampled early, middle, and late captures and confirmed that the annotated expert windows are inside the traces and visually aligned.

Notes

The analog chain is AC-coupled/high-pass and the installed current clamp is outside its specified flat bandwidth for MHz-scale components. Treat absolute current calibration cautiously; the main intended use is comparative classification/analysis of expert-conditioned trace structure.