docs/task-json-reference.md

# Task JSON reference

Read [one task first](../README.md#3-read-your-first-task), then use this reference to interpret its fields.

This reference covers every field observed in 61 inspected JSON examples across all 59 task-bearing directories, checked against the project appendix. It is not an exhaustive schema validation of all 773,716 tasks. An observed field is not automatically mandatory for every record.

All `Data/...` paths resolve against the extracted dataset root. Empty strings, empty lists, and the literal `"none"` are distinct recorded values. Missing fields should be handled explicitly.

## Field dictionary

| Field | Observed type | Meaning and use | Example |
|---|---|---|---|
| `metadata` | object | Task identity and source-reference information. These fields are not automatically model inputs. | `{…}` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `metadata.task_id` | string | Task identifier. Preserve the full string; do not infer paths solely from its naming pattern. | `"L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121"` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `metadata.task_level` | string | Benchmark level: Level1, Level2, or Level3. | `"Level1"` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `metadata.task_family` | string | Human-readable task family. The task map links this label to its exact directory spelling. | `"Audio-to-Motion Generation"` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `metadata.task_type` | string | Task-specific variant or constraint label (for example fast, scale_up, legs, or 2x). An empty string means no label is recorded here. Read the instruction for the actual requested behavior. | `""` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `metadata.original_video` | string | Dataset-root-relative source/reference video path. May refer to human or skeleton footage. It is not necessarily an allowed conditioning input. | `"Data/Shared/Video/Human/00065/--04DHOI32k_00009_38_121.mp4"` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `metadata.original_motion` | string | Dataset-root-relative source/reference motion path: usually a CSV directory, but a PKL file for Order/Times. | `"Data/Shared/Motion/00065/--04DHOI32k_00009_38_121"` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `metadata.duration` | number | Recorded task/source duration in seconds. Do not infer CSV row count or modified output duration from this alone; motion packages can include a hold period. | `2.803` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input` | object | Conditioning information supplied for this task. | `{…}` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.prompts` | object | Instruction strings. Use together with the modality content. | `{…}` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.prompts.general_instruction` | string | Task-level instruction describing the expected behavior. Preserved verbatim, including any output-format wording; no tokenizer or model interface is supplied here. | `"You are an advanced 3D motion generation model designed to synthesize p…` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.prompts.modifier_instruction` | string | Additional behavioral constraint, when present. Empty does not imply no constraint: it may be contained in text or spoken audio. | `""` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.modalities` | object | Level 1/2 conditioning fields. In the inspected Level 3 examples this is empty; use input.interleave.sequence instead. | `{…}` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.modalities.text` | string | Inline text condition. Empty string means no text content in this field; audio may carry the instruction. | `""` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.modalities.audios` | array | Ordered list of dataset-root-relative audio file paths. Empty list means this field supplies no audio. | `[…]` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.modalities.videos_processed` | array | Ordered list of conditioning-video paths. Order/video uses two clips whose list order is referenced by the instruction. Do not replace these with metadata.original_video. | `[…]` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.modalities.spatial_coordinates` | array | List of conditioning-file paths, not inline coordinate arrays. Rotation-to-Pose examples point to a PKL motion-conditioning pack. | `[…]` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.modalities.input_images` | array | List of image conditions. Key-frame examples use objects containing path and time; Trajectory examples use path strings. Support both forms. | `[…]` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `ground_truth` | object | Task reference/target information. Its meaning depends on the task family; it is not a conditioning input. | `{…}` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `ground_truth.motion_parameters` | string | Motion directory or file referenced by this task. Temporal-completion examples point to the missing segment; Amplitude, Speed, Direction, and Body Restrain point to the unmodified reference motion. | `"Data/Shared/Motion/00065/--04DHOI32k_00009_38_121"` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `ground_truth.rendered_video` | string | Video path recorded with the reference, or the literal string "none" when absent. Do not treat "none" as a filename. A video here is not necessarily a rendered constraint-satisfying output. | `"none"` · [JSON](../examples/tasks/L1_audio_to_motion_generation_audio_--04DHOI32k_00009_38_121.json) |
| `input.modalities.input_images[]` | object | Image-condition object; see path and time below. | `{…}` · [JSON](../examples/tasks/L1_key_frame_conditioning_human_image_--3wjNOccLY_00002_0_63.json) |
| `input.modalities.input_images[].path` | string | Key-frame image path relative to the dataset root. | `"Data/Level1/Image/HumanKeyframes/--3wjNOccLY_00002_0_63_joint0.jpg"` · [JSON](../examples/tasks/L1_key_frame_conditioning_human_image_--3wjNOccLY_00002_0_63.json) |
| `input.modalities.input_images[].time` | number | Key-frame timestamp in seconds on the source motion timeline. | `1.2` · [JSON](../examples/tasks/L1_key_frame_conditioning_human_image_--3wjNOccLY_00002_0_63.json) |
| `ground_truth.time_window` | array | Two-element [start, end] interval in seconds on the original timeline, recorded for temporal-completion targets. The referenced motion directory is already segmented. Do not crop it a second time. Endpoint-to-frame details must follow the package and evaluation code. | `[…]` · [JSON](../examples/tasks/L1_motion_interpolation_audio_--6s5bu1NRU_00008_0_463.json) |
| `ground_truth.trajectory_points` | object | Trajectory-task reference waypoints in two coordinate representations. | `{…}` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.canonical_xz_meters` | object | Named two-number [x, z] waypoints in the canonical horizontal plane, in meters. | `{…}` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.canonical_xz_meters.start` | array | Two-number start waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.canonical_xz_meters.point_1_4` | array | Two-number quarter-position waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.canonical_xz_meters.point_1_2` | array | Two-number midpoint waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.canonical_xz_meters.point_3_4` | array | Two-number three-quarter-position waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.canonical_xz_meters.end` | array | Two-number end waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.image_pixels` | object | Corresponding two-number image-coordinate waypoints in pixels. Keep the paired image; do not interpret these as meters. | `{…}` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.image_pixels.start` | array | Two-number start waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.image_pixels.point_1_4` | array | Two-number quarter-position waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.image_pixels.point_1_2` | array | Two-number midpoint waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.image_pixels.point_3_4` | array | Two-number three-quarter-position waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `ground_truth.trajectory_points.image_pixels.end` | array | Two-number end waypoint, using the coordinate representation of its parent. These names do not by themselves specify timestamps or an interpolation rule. | `[…]` · [JSON](../examples/tasks/L2_trajectory_audio_-0twpb3R9-E_00016_1345_1439_clockwise_or_counterclockwise.json) |
| `input.interleave` | object | Level 3 ordered multimodal condition and its recorded selection identifiers. | `{…}` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.seed` | integer | Recorded integer seed. Preserve as an integer; observed values can exceed signed 64-bit or JavaScript exact-integer range. Not a timing value or input asset. | `16934628329455981502` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.seed_source` | string | String identifying the recorded seed source. Preserved for traceability; not a path to download. | `"--6s5bu1NRU_00008_0_463 / L3_INTERLEAVE / v1"` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence` | array | Chronologically ordered list of modality components. Retain order and timestamps when reading. | `[…]` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[]` | object | One typed condition component. Fields depend on type; not every component has every field below. | `{…}` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].order` | integer | Zero-based position in the interleaved component sequence. | `0` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].type` | string | Component modality: text, audio, video, or image. | `"video"` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].segment_index` | integer | Zero-based motion-segment index for text/audio/video. Different from order because images may be inserted between segments. | `0` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].start_time` | number | Segment start time in seconds on the original timeline. | `0.0` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].end_time` | number | Segment end time in seconds on the original timeline. This does not specify a CSV slicing convention by itself. | `3.5` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].video_path` | string | For video components: dataset-root-relative cropped input-video path. | `"Data/Level3/Video/--6s5bu1NRU_00008_0_463_seg00.mp4"` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].boundary_after_segment` | integer | For image components: zero-based index of the segment preceding this boundary. | `0` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].timestamp` | number | For image components: boundary timestamp in seconds on the original timeline. | `3.5` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].image_path` | string | For image components: dataset-root-relative boundary-image path. | `"Data/Level3/Image/--6s5bu1NRU_00008_0_463_boundary00.jpg"` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].audio_path` | string | For audio components: dataset-root-relative spoken segment-description path. | `"Data/Level3/Audio/--6s5bu1NRU_00008_0_463_seg01.mp3"` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |
| `input.interleave.sequence[].text` | string | For text components: inline motion description. | `"The person bends slightly forward to pick up a pneumatic impact wrench,…` · [JSON](../examples/tasks/L3_interleave_--6s5bu1NRU_00008_0_463.json) |

## Task-specific interpretation

- **Temporal completion:** use the target directory and its original-timeline `time_window`; metadata can still describe the full source clip.
- **Key frames:** keep each image paired with its time. Trajectory image inputs have a different representation.
- **Order:** retain both input clips in list order. The full reference video is not a substitute for the two conditioning clips.
- **Times:** the reference PKL encodes repetitions; the recorded video may show the single source action. Do not label that video as a repeated result.
- **Amplitude / Speed / Direction / Body Restrain:** the reference motion is unmodified. The instruction specifies the requested change; the reference video is not a model result.
- **Trajectory:** use the condition image and recorded waypoints together; do not infer a coordinate transform solely from their values.
- **Level 3:** read `input.interleave.sequence` even when `input.modalities` is empty. Keep the source timeline, segment indices, and image boundaries.

## Motion files

| File | Contents |
|---|---|
| `joint_pos.csv` | 29 robot joint-position columns |
| `joint_vel.csv` | Corresponding joint velocities |
| `body_pos.csv` | Root position in world coordinates |
| `body_quat.csv` | Root orientation quaternion |
| `body_lin_vel.csv` | Root linear velocity |
| `body_ang_vel.csv` | Root angular velocity |

The G1 packages described in the appendix use six synchronized CSV files at 50 Hz. Read each CSV header and the package metadata for its conventions. The inspected full-motion package includes a one-second initial hold, so task duration alone does not determine row count. Do not infer named joint order or quaternion output order from array length. Order/Times instead reference AMASS/BABEL-linked PKL packages; Rotation-to-Pose PKL conditions are another format. These are not interchangeable.

Some released prompt wording differs across task variants (including output-format wording). Examples here preserve those strings rather than silently rewriting task definitions. Model integration and official evaluation commands will be supplied with the benchmark code.