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Physical AI models learn real-world tasks from data that connects what a system senses and what it is asked to do with the physical actions that follow. For a robot, a useful example typically pairs a view of its surroundings and a task instruction with the robot’s action or state. Broader task coverage may come from demonstrations involving different objects, settings, and robot types; web or simulation data can complement those examples, but neither replaces evidence that the model’s behavior works in the intended physical setting.

The essential data: observation, task, and action

A learning example is most useful when it records the context for a behavior and the behavior itself. For a manipulation robot, that often means a sensor observation, a description of the task, and the action taken at that moment. These elements let a model associate a scene and instruction with a physical response.

The exact data format depends on the robot and task. A camera-based arm, a mobile robot, and a healthcare robot may need different sensors, state representations, and action labels. There is no single schema that every physical-AI model must use.

Observations of the world

Images or video show what the robot can see. In the RT-1-X example documented by the Open X-Embodiment repository, the input includes an RGB image from a workspace camera. That particular example does not additionally use wrist-camera images or depth; this is a description of its interface, not a general rule for robot-learning systems. Open X-Embodiment repository

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Other applications may combine video with robot measurements. NVIDIA’s Open-H-Embodiment dataset, a healthcare-robotics collection, pairs video with kinematics. A dataset’s modalities should be chosen to match what the deployed system can sense and what its task requires.

Task instructions and context

A task string tells the model what it should do in a given observation. The RT-1-X interface uses a task string alongside the workspace image. Language can also connect visual scenes to concepts that are not fully represented by a robot’s own demonstrations.

Actions and robot state

Action labels or state-and-action sequences show what the robot did. In the RT-1-X example, the documented action space has seven gripper-movement variables covering position, orientation, and gripper opening. RT-2 uses a different, model-specific representation: it outputs discretized action tokens for such elements as continuation or termination, position and rotation changes, and gripper state. Neither representation is a universal standard; actions depend on an embodiment’s mechanics and controls. Open X-Embodiment repository Google DeepMind: RT-2

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Why diversity matters as much as dataset size

A large collection can still leave a model unprepared for the task it will face. Useful variation may include different skills, objects, environments, backgrounds, instructions, and robot embodiments. Examples across these conditions can help a model encounter more than one narrow version of a task, but a dataset’s count alone does not establish that it covers a particular deployment.

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Open X-Embodiment illustrates the scale and variety of one collaborative robotics effort. In an October 3, 2023 account, Google DeepMind reported that the project combined data from 22 robot types and 33 academic lab partners, spanning more than 500 skills, 150,000 tasks, and over one million episodes. Those figures describe that project’s collection, not a recommended minimum or a universal threshold. Google DeepMind: Scaling up learning across many different robot types

In its reported RT-1-X evaluation, Google DeepMind found a 50% average success-rate improvement over corresponding independently developed methods across five labs and five commonly used robots. This is a result from that experiment, not a guarantee that combining datasets will improve every model or task. Google DeepMind: Scaling up learning across many different robot types

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How web, robot, and simulation data can complement each other

Web and language data add semantic context

Web-scale visual and language data can teach a model concepts about objects, scenes, and instructions. RT-2 combined web and robotics data, using a vision-language model trained on web data and robot examples to connect that knowledge to actions. Its approach represents robot actions as model output tokens; the action representation is specific to the system. Google DeepMind: RT-2

Robot demonstrations ground behavior in physical action

Robot demonstrations show what happened when an action was carried out through a robot’s sensors and controls. In the RT-2 account, Google DeepMind reported collecting data with 13 robots over 17 months for the RT-1 demonstration dataset, and conducting more than 6,000 robotic trials in RT-2 experiments. These are project-specific collection and evaluation figures, not general requirements for training a physical-AI model. Google DeepMind: RT-2

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Simulation is a possible additional source

Simulation can contribute training experience, and RT-2’s reported real-world evaluation used a model trained with both simulation and real data. The cited account does not establish a general simulation-to-real data ratio or show that simulation alone is sufficient for reliable real-world behavior. Claims about transfer should therefore be tied to the particular system and evaluation.

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What the reported results do—and do not—show

Data should be assessed against the behavior and conditions that matter in deployment, not only by episode count or hours. In its RT-2 evaluation, Google DeepMind reported results on previously unseen objects, backgrounds, and environments. The project account gives a success-rate range of 32% to 62% on previously unseen scenarios and 90% on the Language Table simulation suite. Those figures are specific to RT-2’s experiments and evaluation settings; they should not be read as a general benchmark for physical-AI systems. Google DeepMind: RT-2

Healthcare robotics offers a different example of how collection choices follow a domain. NVIDIA’s Open-H-Embodiment dataset card describes a specialized collection for surgical robotics and ultrasound, with paired video and kinematics. The live card, accessed October 7, 2026, lists 750 hours, 120,000 trajectories, and 4.5 TB, and describes human, automatic or sensor-based, and synthetic collection methods. These counts concern a distinct dataset and units, so they should not be compared directly with Open X-Embodiment’s episode or task counts. The card specifies LeRobot v2.1 format, MP4 video, Parquet kinematics, JSON/JSONL metadata, and a CC-BY-4.0 license; the dataset’s specialized scope and stated license should be checked against a prospective use. NVIDIA Open-H-Embodiment dataset card

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A practical checklist for judging a dataset

Before using a dataset or planning a collection effort, compare it with the task and robot that will actually be deployed. These are practical comparison questions, not a standardized scoring rubric.

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  • Modalities and synchronization: Does it include the relevant RGB or multi-view video, depth where needed, robot state or kinematics, task text, and action labels? Are observations and actions aligned in time?
  • Task and scene coverage: Are the skills, objects, backgrounds, lighting, and environments representative of the intended use? Does the collection include variations or task combinations the robot will encounter?
  • Embodiment coverage: Which robot types, sensor placements, and action conventions appear? If the data spans multiple robots, how are their different controls represented or mapped?
  • Collection source: Were examples gathered through real-robot demonstrations, human teleoperation, automatic or sensor capture, simulation, web data, or a mixture? The source affects what behavior the examples can directly support.
  • Evaluation conditions: Are results reported for held-out tasks, objects, backgrounds, and environments, and is the behavior tested on a physical robot where relevant?
  • Data rights and intended use: Check the individual dataset’s license and collection description before reuse. The examples here do not establish a universal quality or governance standard for robot-learning data.

Dataset formats are part of the practical choice

Open X-Embodiment represents data as episodes in RLDS format and provides a Colab workflow for visualizing examples and creating training and inference batches. Its RT-1-X example also documents a particular observation and action interface, which should not be mistaken for a required format for other robots. Open X-Embodiment repository

Open-H-Embodiment illustrates a more domain-focused structure: its dataset card specifies LeRobot v2.1, with video stored as MP4, kinematics as Parquet, and metadata as JSON or JSONL. Its healthcare scope and specified license do not automatically make its data appropriate for an unrelated robot or application. NVIDIA Open-H-Embodiment dataset card

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