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Task2Vec: Task Embedding for Meta-Learning

Achille, Alessandro and Lam, Michael and Tewari, Rahul and Ravichandran, Avinash and Maji, Subhransu and Fowlkes, Charless and Soatto, Stefano and Perona, Pietro (2019) Task2Vec: Task Embedding for Meta-Learning. . (Unpublished) http://resolver.caltech.edu/CaltechAUTHORS:20190327-085927491

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Abstract

We introduce a method to provide vectorial representations of visual classification tasks which can be used to reason about the nature of those tasks and their relations. Given a dataset with ground-truth labels and a loss function defined over those labels, we process images through a "probe network" and compute an embedding based on estimates of the Fisher information matrix associated with the probe network parameters. This provides a fixed-dimensional embedding of the task that is independent of details such as the number of classes and does not require any understanding of the class label semantics. We demonstrate that this embedding is capable of predicting task similarities that match our intuition about semantic and taxonomic relations between different visual tasks (e.g., tasks based on classifying different types of plants are similar) We also demonstrate the practical value of this framework for the meta-task of selecting a pre-trained feature extractor for a new task. We present a simple meta-learning framework for learning a metric on embeddings that is capable of predicting which feature extractors will perform well. Selecting a feature extractor with task embedding obtains a performance close to the best available feature extractor, while costing substantially less than exhaustively training and evaluating on all available feature extractors.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1902.03545arXivDiscussion Paper
ORCID:
AuthorORCID
Fowlkes, Charless0000-0002-2990-1780
Perona, Pietro0000-0002-7583-5809
Record Number:CaltechAUTHORS:20190327-085927491
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190327-085927491
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94203
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:27 Mar 2019 16:21
Last Modified:27 Mar 2019 16:21

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