Transfer learning in hybrid classical-quantum neural networks

Andrea Mari; Thomas R. Bromley; Josh Izaac; Maria Schuld; Nathan Killoran

doi:10.22331/q-2020-10-09-340

Transfer learning in hybrid classical-quantum neural networks

Andrea Mari, Thomas R. Bromley, Josh Izaac, Maria Schuld, and Nathan Killoran

Xanadu, 777 Bay Street, Toronto, Ontario, Canada.

Published:	2020-10-09, volume 4, page 340
Eprint:	arXiv:1912.08278v2
Doi:	https://doi.org/10.22331/q-2020-10-09-340
Citation:	Quantum 4, 340 (2020).

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Abstract

We extend the concept of transfer learning, widely applied in modern machine learning algorithms, to the emerging context of hybrid neural networks composed of classical and quantum elements. We propose different implementations of hybrid transfer learning, but we focus mainly on the paradigm in which a pre-trained classical network is modified and augmented by a final variational quantum circuit. This approach is particularly attractive in the current era of intermediate-scale quantum technology since it allows to optimally pre-process high dimensional data (e.g., images) with any state-of-the-art classical network and to embed a select set of highly informative features into a quantum processor. We present several proof-of-concept examples of the convenient application of quantum transfer learning for image recognition and quantum state classification. We use the cross-platform software library PennyLane to experimentally test a high-resolution image classifier with two different quantum computers, respectively provided by IBM and Rigetti.

Popular summary

Transfer learning is a typical example of an artificial intelligence technique that has been originally inspired by biological intelligence. It originates from the simple observation that the knowledge acquired in a specific context can be transferred to a different area. For example, when we learn a second language we do not start from scratch, but we make use of our previous linguistic knowledge. Sometimes transfer learning is the only way to approach complex cognitive tasks, e.g., before learning quantum mechanics it is advisable to first study linear algebra. This general idea has been successfully applied also to design artificial neural networks. It has been shown that in many situations, instead of training a full network from scratch, it is more efficient to start from a pre-trained deep network and then optimize only some of the final layers for a particular task and dataset of interest. The aim of this work is to investigate the potential of the transfer learning paradigm in the context of quantum machine learning.

► BibTeX data

@article{Mari2020transferlearningin,
  doi = {10.22331/q-2020-10-09-340},
  url = {https://doi.org/10.22331/q-2020-10-09-340},
  title = {Transfer learning in hybrid classical-quantum neural networks},
  author = {Mari, Andrea and Bromley, Thomas R. and Izaac, Josh and Schuld, Maria and Killoran, Nathan},
  journal = {{Quantum}},
  issn = {2521-327X},
  publisher = {{Verein zur F{\"{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}},
  volume = {4},
  pages = {340},
  month = oct,
  year = {2020}
}

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