IP Library › Granted Patent US 12,614,117
Granted Patent B2
US 12,614,117 · App. 18/499,909 · Granted Apr 28, 2026

Systems and methods for labeling large datasets of physiological records based on unsupervised machine learning

Inventors: Sharanya Arcot Desai (Sunnyvale, CA); Thomas K. Tcheng (Pleasant Hill, CA); Benjamin E. Shanahan (San Jose, CA)
Assignee: NeuroPace, Inc.
G06N20/00G06F9/30036G06F18/2155G06F18/22G06F18/2321G06N3/08G06V2201/031
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Quick Facts
Patent No.
US 12,614,117
App. No.
18/499,909
Granted
Apr 28, 2026
Kind
B2
Abstract

A deep learning model and dimensionality reduction are applied to each of a plurality of records of physiological information to derive a plurality of feature vectors. A similarities algorithm is applied to the plurality of feature vectors to form a plurality of clusters, each including a set of feature vectors. An output comprising information that enables a display of one or more of the plurality of clusters is provided, and a mechanism for selecting at least one feature vector within a selected cluster of the plurality of clusters is enabled. Upon selection of a feature vector, an output comprising information that enables a display of the record of physiological information corresponding to the selected feature vector is provided, and a mechanism for assigning a label to the displayed record is enabled. The assigned label is then automatically assigned to the records corresponding to the remaining feature vectors in the selected cluster.

Claims (50)

1 . A records classification processor for labeling records of electrical activity of a brain, the records classification processor comprising:

a records section module configured to select a plurality of from records stored in a database such that the records in the plurality of records of electrical activity of the brain have at least one parameter in common, where the at least one parameter in common comprises one of: time of capture of the electrical activity of the brain, date of capture of the electrical activity of the brain, area of a brain where electrical activity of the brain was sensed, and a characteristic of the electrical activity of a brain;

a feature extraction module configured to derive a plurality of multi-dimensional feature vectors from the plurality of records of electrical activity of the brain;

a feature reduction module configured to reduce the plurality of multi-dimensional feature vectors to a corresponding plurality of reduced-dimension feature vectors;

a similarities module configured to form a plurality of clusters based on the plurality of reduced-dimension feature vectors, wherein each cluster has associated therewith a set of records of electrical activity of the brain; and

a labeling module configured to enable, for at least one of the plurality of clusters:

an automatic assignment of an automatically assigned label to each record of electrical activity of the brain included in the set of records of electrical activity of the brain associated with the cluster, and

a validation of one or more of the automatically assigned labels,

wherein the labeling module validates one or more automatically-assigned labels by being configured to:

provide an output comprising information that enables a display of a record of electrical activity of the brain together with its automatically assigned label; and

enable a mechanism for confirming an accuracy of the automatically assigned label.

2 . The records classification processor of claim 1 , wherein the feature extraction module is configured to apply a deep learning model to each of the plurality of records of electrical activity of the brain to derive the plurality of multi-dimensional feature vectors.

3 . The records classification processor of claim 2 , wherein the deep learning model comprise one or more of a pretrained convolution neural network (CNN), an autoencoder, a recurrent neural network (RNN), or a deep neural network.

4 . The records classification processor of claim 1 , wherein the feature reduction module is configured to apply a dimensionality reduction process to each of the plurality of multi-dimensional feature vectors to derive the corresponding plurality of reduced-dimension feature vectors.

5 . The records classification processor of claim 4 , wherein the dimensionality reduction process is implemented through at least one of principal component analysis, t-distributed stochastic gradient descent, and t-distributed stochastic gradient neighbor embedding.

6 . The records classification processor of claim 1 , wherein the similarities module is configured to apply a clustering algorithm to the plurality of reduced-dimension feature vectors to form the plurality of clusters.

7 . The records classification processor of claim 6 , wherein the clustering algorithm comprises one of k-means clustering, spectral clustering, or a Bayesian Gaussian mixed model.

8 . The records classification processor of claim 1 , further comprising an interface configured to be coupled to a user interface to receive user inputs, and to be coupled to a display to output display information, wherein the labeling module is configured to enable an automatic assignment of a label to each record of electrical activity of the brain included in the set of records by being configured to:

provide an output to the interface comprising information that enables a display of the plurality of clusters;

enable a mechanism through the display and user interface for selecting at least one record of electrical activity of the brain associated with one of the displayed plurality of clusters;

provide an output to the interface comprising information that enables a display of the at least one selected record of electrical activity of the brain;

enable a mechanism through the display and user interface for assigning a label to the at least one displayed record of electrical activity of the brain; and

automatically assign the assigned label to the other records of electrical activity of the brain associated with the cluster that the at least one selected record of electrical activity of the brain is associated with, to create automatically-labeled records of electrical activity of the brain.

9 . The records classification processor of claim 8 , wherein the labeling module is further configured to:

confirm that a same label has been assigned to each of the at least one displayed record of electrical activity of the brain prior to automatically assigning the label to the other records of electrical activity of the brain associated with the cluster.

10 . The records classification processor of claim 1 , wherein the labeling module is further configured to enable a mechanism for assigning a different label to a record of electrical activity of the brain when the accuracy of the automatically assigned label is not confirmed for the record.

11 . The records classification processor of claim 1 , wherein the labeling module is further configured to automatically associate a record of electrical activity of the brain to an adjacent cluster in the plurality of clusters when the accuracy of the automatically assigned label for the record is not confirmed.

12 . The records classification processor of claim 11 , wherein the labeling module is configured to select the adjacent cluster based on a measure of similarity between the reduced-dimension feature vector corresponding to the record of electrical activity of the brain and centroid feature vectors of clusters surrounding the selected cluster.

13 . The records classification processor of claim 1 , wherein the labeling module is configured to validate the automatically assigned labels of records of electrical activity of the brain in an order that is determined based on a distance between each reduced-dimension feature vector corresponding to a record of electrical activity of the brain in a selected cluster and a centroid feature vector of the selected cluster.

14 . A method of labeling records of electrical activity of the brain, the method comprising:

selecting a plurality of records of electrical activity of the brain from records stored in a database such that the records in the plurality of records of electrical activity of the brain have at least one parameter in common, where the at least one parameter in common comprises one of: time of capture of the electrical activity of the brain, date of capture of the electrical activity of the brain, area of a brain where electrical activity of the brain was sensed, and a characteristic of the electrical activity of a brain;

deriving a plurality of multi-dimensional feature vectors from the plurality of records of electrical activity of the brain;

reducing the plurality of multi-dimensional feature vectors to a corresponding plurality of reduced-dimension feature vectors;

forming a plurality of clusters based on the plurality of reduced-dimension feature vectors, wherein each cluster has associated therewith a set of records of electrical activity of the brain; and

enabling, for at least one of the plurality of clusters, an automatic assignment of an automatically assigned label to each record of electrical activity of the brain included in the set of records of electrical activity of the brain associated with the cluster, and a validation of one or more of the automatically assigned labels,

wherein validating one or more automatically-assigned labels comprises:

providing an output comprising information that enables a display of a record of electrical activity of the brain together with its automatically assigned label; and

enabling a mechanism for confirming an accuracy of the automatically assigned label.

15 . The method of claim 14 , further comprising:

providing an output to an interface coupled to a user interface to receive user inputs, and to a display to output display information, the output comprising information that enables a display of the plurality of clusters;

enabling a mechanism through the display and a user interface for selecting at least one record of electrical activity of the brain associated with one of the displayed plurality of clusters;

providing an output to the interface comprising information that enables a display of the at least one selected record of electrical activity of the brain;

enabling a mechanism through the display and the user interface for assigning a label to the at least one displayed record of electrical activity of the brain; and

automatically assigning the assigned label to the other records of electrical activity of the brain associated with the cluster that the at least one selected record of electrical activity of the brain is associated with, to create automatically-labeled records of electrical activity of the brain.

16 . The method of claim 15 , further comprising:

confirming that a same label has been assigned to each of the at least one displayed record of electrical activity of the brain prior to automatically assigning the label to the other records of electrical activity of the brain associated with the cluster.

17 . The method of claim 14 , further comprising enabling a mechanism for assigning a different label to a record of electrical activity of the brain when the accuracy of the automatically assigned label is not confirmed for the record.

18 . The method of claim 14 , further comprising automatically associating a record of electrical activity of the brain to an adjacent cluster in the plurality of clusters when the accuracy of the automatically assigned label for the record is not confirmed.

19 . The method of claim 18 , further comprising selecting the adjacent cluster based on a measure of similarity between the reduced-dimension feature vector corresponding to the record of electrical activity of the brain and centroid feature vectors of clusters surrounding the selected cluster.

20 . The method of claim 14 , further comprising validating the automatically assigned labels of records of electrical activity of the brain in an order that is determined based on a distance between each reduced-dimension feature vector corresponding to a record of electrical activity of the brain in a selected cluster and a centroid feature vector of the selected cluster.

Assignments (2)
SECURITY INTEREST Recorded Jun 25, 2025
From: NEUROPACE, INC.
To: MIDCAP FUNDING IV TRUST
Reel/Frame 071712/0422 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 1, 2023
From: ARCOT DESAI, SHARANYA; TCHENG, THOMAS K.; SHANAHAN, BENJAMIN E.
To: NEUROPACE, INC.
Reel/Frame 065427/0382 →
Continuity (4)
Continuation 17948947 · Sep 20, 2022
Continuation 16796692 · Feb 20, 2020
Provisional Application 62809427 · Feb 22, 2019
Related Publication 20240062118A1 · Feb 22, 2024
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