Learning an autoencoder

Patent metadata

Field	Value
Publication number	US-10839267-B2
Application number	US-201815965123-A
Country	US
Kind code	B2
Filing date	Apr 27, 2018
Priority date	Apr 27, 2017
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A computer-implemented method for learning an autoencoder notably is provided. The method comprises providing a dataset of images. Each image includes a respective object representation. The method also comprises learning the autoencoder based on the dataset. The learning includes minimization of a reconstruction loss. The reconstruction loss includes a term that penalizes a distance for each respective image. The penalized distance is between the result of applying the autoencoder to the respective image and the set of results of applying at least part of a group of transformations to the object representation of the respective image. Such a method provides an improved solution to learn an autoencoder.

First claim

The invention claimed is:

1. A computer-implemented method for learning an autoencoder, the method comprising:
obtaining a dataset of images, each image including a respective object representation: and
learning the autoencoder based on the dataset, the learning including minimization of a reconstruction loss, the reconstruction loss including a term that penalizes for each respective image a distance between the result of applying the autoencoder to the respective image and the set of results of applying at least part of a group of transformations to the object representation of the respective image,
wherein the autoencoder is invariant with respect to at least part of the group of transformations,
wherein the autoencoder includes a transformation component configured to apply each one of the at least part of the group of transformations to the object representation of an input image, an aggregation component configured to be applied to results stemming from the transformation component, an encoding component and a decoding component, and
wherein the results stemming from the first component to which the aggregation component is configured to be applied are vectors of a same size, the aggregation component outputting a vector of the same size having for each coordinate a value equal to the maximum among the values of said coordinate for the vectors to which the aggregation component is configured to be applied.

2. The method of claim 1 , wherein the encoding component is configured be applied in parallel to each result of the transformation component.

3. The method of claim 2 , wherein the aggregation component is configured to be applied to the results of the encoding component.

4. The method of claim 1 , wherein the decoding component is configured to be applied to the result of the aggregation component.

5. The method of claim 1 , wherein the encoding component and/or the decoding component includes a convolutional neural network.

6. The method of claim 1 , wherein the images are surface occupancy 3D models, the group of transformations including translations.

7. A computer-implemented method for learning an autoencoder, the method comprising:
obtaining a dataset of images, each image including a respective object representation; and
learning the autoencoder based on the dataset, the learning including minimization of a reconstruction loss, the reconstruction loss including a term that penalizes for each respective image a distance between the result of applying the autoencoder to the respective image and the set of results of applying at least part of a group of transformations to the object representation of the respective image,
wherein the object representations are each a representation of an instance of a same class of objects, each image of the dataset having a non-oriented frame, each object representation being aligned in the non-oriented frame, the group of transformations including all rotations from one alignment in the non-oriented frame to another alignment in the non-oriented frame.

8. The method of claim 7 , wherein the autoencoder is invariant with respect to at least part of the group of transformations.

9. The method of claim 8 , wherein the autoencoder includes a transformation component configured to apply each one of the at least part of the group of transformations to the object representation of an input image, an aggregation component configured to be applied to results stemming from the transformation component, an encoding component and a decoding component.

10. The method of claim 9 , wherein the encoding component is configured be applied in parallel to each result of the transformation component.

11. The method of claim 10 , wherein the aggregation component is configured to be applied to the results of the encoding component.

12. The method of claim 9 , wherein the decoding component is configured to be applied to the result of the aggregation component.

13. The method of claim 9 , wherein the encoding component and/or the decoding component includes a convolutional neural network.

14. The method of claim 7 , wherein the images are surface occupancy 3D models, the group of transformations including translations.

15. A device comprising:
a data storage medium having recorded thereon a data structure, the data structure comprising an encoder, a decoder, and/or the whole of an autoencoder learnable according to computer-implementable instructions for learning an autoencoder, the instructions configuring a processor to:
obtain a dataset of images, each image including a respective object representation, and
learn the autoencoder based on the dataset, the learning including minimization of a reconstruction loss, the reconstruction loss including a term that penalizes for each respective image a distance between the result of applying the autoencoder to the respective image and the set of results of applying at least part of a group of transformations to the object representation of the respective image,
wherein the autoencoder is invariant with respect to at least part of the group of transformations,
wherein the autoencoder includes a transformation component configured to apply each one of the at least part of the group of transformations to the object representation of an input image, an aggregation component configured to be applied to results stemming from the transformation component, an encoding component and a decoding component, and
wherein the results stemming from the first component to which the aggregation component is configured to be applied are vectors of a same size, the aggregation component outputting a vector of the same size having for each coordinate a value equal to the maximum among the values of said coordinate for the vectors to which the aggregation component is configured to be applied.

16. The device of claim 15 , wherein the device further comprises the processor coupled to the data storage medium.

17. A device comprising:
a data storage medium having recorded thereon a data structure, the data structure comprising a computer program including instructions for learning an autoencoder, the instructions configuring a processor to:
obtain a dataset of images, each image including a respective object representation, and
learn the autoencoder based on the dataset, the learning including minimization of a reconstruction loss, the reconstruction loss including a term that penalizes for each respective image a distance between the result of applying the autoencoder to the respective image and the set of results of applying at least part of a group of transformations to the object representation of the respective image,
wherein the autoencoder is invariant with respect to at least part of the group of transformations,
wherein the autoencoder includes a transformation component configured to apply each one of the at least part of the group of transformations to the object representation of an input image, an aggregation component configured to be applied to results stemming from the transformation component, an encoding component and a decoding component, and
wherein the results stemming from the first component to which the aggregation component is configured to be applied are vectors of a same size, the aggregation component outputting a vector of the same size having for each coordinate a value equal to the maximum among the values of said coordinate for the vectors to which the aggregation component is configured to be applied.

18. The device of claim 17 , wherein the device further comprise

Assignees

• Dassault Systemes

Inventors

• Mehr Eloi
• Lieutier Andre

Classifications

• G06V30/1916

  Validation; Performance evaluation · CPC title

• G06V30/19173

  Classification techniques · CPC title

• G06V10/82

  using neural networks · CPC title

• G06F18/217

  Validation; Performance evaluation; Active pattern learning techniques · CPC title

• G06T7/30 Primary

  Determination of transform parameters for the alignment of images, i.e. image registration · CPC title