The Kotwel Knowledge Base

Ideas for building better data products.

Practical articles on data quality, human insight, AI systems, and the flywheels that turn learning into durable advantage.

16 published articles Written for learners, builders, and decision-makers
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Concept Learning Methods Cách phần thưởng biến trải nghiệm của robot thành một chính sách điều khiển, vì sao dữ liệu ngoại tuyến và mô phỏng giúp giảm chi phí tương tác phần cứng, và những chỗ học tăng cường vẫn thất bại trước tín hiệu thành công mơ hồ.

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16 articles found

IMU

What an inertial measurement unit measures across acceleration and angular velocity, why bias and integration make its stream drift, and where timing, calibration, and cross-sensor evidence determine whether the data can be trusted.

ROS 2

What the middleware underneath most robotics stacks actually provides, why a recorded bag carries three different clocks and none of them is the sensor's own, and where a training corpus loses its coordinate frames on the way out of ROS 2.

ABC-130k

What ABC-130k records per teleoperated episode, why its two station hardware variants complicate pooling the corpus for training, and how its separable annotation file works as a provenance pattern for a recording distributed in its native MCAP container.

Synthetic Data for Robotics

What a generated episode contains once its pixels or its actions come from a model rather than a sensor, why the mixing ratio against real data decides whether co-training helps, and where a corpus stops recording which episodes were measured.

Whole-Body Teleoperation

How a human operator's motion becomes a humanoid robot's joint commands, why VR headsets, IMU suits and optical motion capture each measure a different slice of the body, and why the resulting recording is usually the controller's output rather than the operator's raw intent.

Egocentric Data

Where a camera attached to the actor changes what a recording can assert, what a single head turn does to an object's identity in the labels, and why the rule for frame exits has to be written before annotation starts.

Cross-modal Alignment

What has to hold before two modalities agree on which of their parts refer to the same thing, why a robot policy scores highly on instructions it is actively contradicting, and where that correspondence comes from the labeling rather than the architecture.

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