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metadata/schema.md

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-# Schema
-
-## Public QA fields
-
-- `item_id`: Stable public item identifier.
-- `split`: `eval` or `sft`.
-- `source`: `GM-100`, `RH20T`, `REASSEMBLE`, or `AIST-Bimanual`.
-- `source_slug`: Short source slug used in release-relative references.
-- `source_task_id`: Source-side task identifier without local paths.
-- `source_unit_type`: Split-isolation unit type, e.g. `episode` or `recording`.
-- `source_unit_id`: Public unit identifier without local paths.
-- `task_id`: Canonical paper task ID `T1` ... `T12`.
-- `task_name`: Canonical paper task name.
-- `task_type_legacy`: Legacy engineering task name when it differs from paper naming.
-- `input_type`: Public input format description.
-- `question`: Public question text.
-- `choice_A` ... `choice_F`: Flattened answer choices.
-- `answer`: Public answer label in the release schema.
-- `answer_text`: Public answer text mapped from `answer`.
-- `num_choices`: Number of non-null answer choices.
-- `num_frames`: Number of referenced frames.
-- `frame_indices_json`: JSON-encoded frame indices.
-- `display_labels_json`: JSON-encoded panel labels such as `["X", "Y"]` or `["X", "Z", "Y"]`.
-- `camera`: Source camera identifier when available.
-- `arm_type`: Source-side arm configuration tag when available.
-- `visual_ref`: Release-relative visual reference string. This is not a local filesystem path.
-- `source_episode_ref`: Release-relative source unit reference.
-- `reconstruction_key_json`: Minimal JSON payload needed to reconstruct the sample with upstream data and source-specific scripts.
-- `task_meta_in_source`: Whether source-side task metadata/context exists upstream.
-- `task_meta_public`: Always `false` in this release build. Separate structured task-meta fields are intentionally withheld.
-- `split_version`: Current split version.
-- `split_group_id`: Source-side split group identifier.
-- `builder_version`: Public builder version tag.
-- `prompt_version`: Public prompt-serialization version tag.
-- `sft_target`: SFT-only supervised target string. Present only in `processdata_sft.*`.
-
-## Notes
-
-- `T5` is equivalent to `T_progress`.
-- `T8` is equivalent to `T_temporal`.
-- `T9` is equivalent to `T_binary`.
-- `T8` is normalized into six explicit permutation choices so the public table remains flat and Parquet-friendly.
-- `T9` is normalized to `A/B` choices even when the source data originally used `X/Y`.