
Daniel D. Lee
Associate Professor, ESE
Research Interests
Machine Learning Algorithms: Why
is it that if computers have gotten so much faster and cheaper,
they have not become any better at understanding what we want them
to do? Some of the tasks we take for granted such as vision and
language are still too difficult for the fastest supercomputers
to handle. To us, a picture may be worth a thousand words, but to
a machine it's just a seemingly random jumble of numbers. How can
we get machines to intelligently process this kind of information?
Algorithms that mimic the way biological brains compute and learn
may be the answer. I believe that in order for computers to sense
and respond intelligently to our actions, they need to be endowed
with the fundamental ability to adapt and learn from experience.
But with data-intensive, multimodal inputs such as audio and video,
many computational algorithms suffer from information overload.
It is very difficult to detect the important features to attend
to and to learn from. The theoretical research in my lab is focused
on the problem of extracting the underlying key features from such
data.
Current Projects
Representative Publications
A
kernel view of the dimensionality reduction of manifolds
J. H. Ham, D. D. Lee, and S. Mika, and B. Schoelkopf
Proceedings of the International Conference on Machine Learning
(2004).
Nonnegative
deconvolution for time of arrival estimation
Y. Lin, D. D. Lee and L. K. Saul
International Conference on Acoustics, Speech, and Signal
Processing (2004).
Short-term memory in orthogonal neural networks
O. L. White, D. D. Lee and H. Sompolinsky
Phys. Rev. Lett. 92, 148102 (2004).
Spontaneous eye movements in goldfish: oculomotor integrator performance,
plasticity, and dependence on visual feedback
B. D. Mensh, E. Aksay, D. D. Lee, H. S. Seung and D. W. Tank
Vision Research 44, 711-726 (2004).
Learning
high dimensional correspondences with low dimensional manifolds
J. H. Ham, D. D. Lee, and L. K. Saul
Proceedings of the ICML 2003 Workshop on The Continuum from
Labeled to Unlabeled Data in Machine Learning and Data Mining,
34-41 (2003).
Equilibrium properties of temporally asymmetric Hebbian plasticity
J. Rubin, D. D. Lee and H. Sompolinsky,
Phys. Rev. Lett 86, 364 (2001).
Stability
of the memory of eye position in a recurrent network of conductance-based
model neurons
H. S. Seung, D. D. Lee, B. Y. Reis, D. W. Tank
Neuron 26, 259 (2000).
The
manifold ways of perception
H. S. Seung and D. D. Lee,
Science 290, 2268-2269 (2000).
Learning
the parts of objects with nonnegative matrix factorization
D. D. Lee and H. S. Seung,
Nature 401, 788 (1999).
Teaching
- ESE
350 - Embedded Systems/Microcontroller Lab
- ESE 650 - Learning
in Robotics
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Contact Information
| Office:
| 330 Moore GRW
|
| Phone:
| 215-898-8112
|
| Fax:
| 215-573-2068
|
| Email:
| ddlee at host cis.upenn.edu
|
| Mail:
| Electrical and Systems Engineering
University of Pennsylvania
200 South 33rd Street
Philadelphia, PA 19104
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