Supervised and unsupervised techniques for motion classification

An identity verification system comprising:

• computing device configured to record a sequence of motion data characterizing movements performed by a target user;
• a clustering module configured to:
• receive, from at least one sensor, a sequence of motion data characterizing movements performed by a target user, wherein the sequence of motion data is encoded as a point cloud of the motion data;
• a motion classifier module configured to:
• input the point cloud of the motion data into a machine-learned model trained based on manually labeled point clusters of a training set of motion data, wherein each labeled point cluster of the training set represents a mapping from the points in the labeled point cluster to a movement;
• identify, by the machine-learned model, a movement represented by the point cluster of the motion data based on points of the point cloud of the motion data, wherein the identification assigns a label to the point cloud describing the movement represented by the point cloud;
• and
• generate a labeled representation of the sequence of motion data comprising the label and identifying the portion of the sequence of motion data corresponding to the identified movement.

A method comprising:

• receiving, from at least one sensor, a sequence of motion data characterizing movements performed by a target user, wherein the sequence of motion data is encoded as a point cloud of the motion data;
• inputting the point cloud of the motion data into a machine-learned model trained based on manually labeled point clusters of a training set of motion data, wherein each labeled point cluster of the training set represents a mapping from the points in the labeled point cluster to a movement;
• identifying, by the machine-learned model, a movement represented by the point cloud of the motion data, wherein the identification assigns a label to the point cloud describing the movement represented by the point cloud;
• and
• generating a labeled representation of the sequence of motion data comprising the label and identifying a portion of the sequence of motion data corresponding to the identified movement.