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Scheduler Update

Author:Cynthia @ August 7th, 2007 Leave a Comment

I visited ECEC today, and they said everything had been working fine since Javier fixed the screen problem.

However, there seems to be some sort of problem with the MetaController. It seems that the base scheduler (SchedulerAsobo) has been running since the 31st, and the MetaController has not been running and switching between it and the learning controller. I am looking into the problem.

Screen Problem

Author:movellan @ August 7th, 2007 Leave a Comment

I visited room 1 at 9:30 am. Apparently asobo’s screen had been red since about 11:00 the day before. Everything was working but the screen was just red. Very likely the cause was heat. Denise said that children had put behind asobo and one of them was obstructing the fan.

I soft-restarted the windows and mac boxes and boot up the rubios modules for the experiment.

Asobo OK after weekend

Author:movellan @ August 6th, 2007 Leave a Comment

I checked asobo at 12:00 am from the lab using the console utility. All systems appeared to be functional.

Predictive State Representations (Lab Metting: Eric Wiewiora)

Author:nick @ August 6th, 2007 Leave a Comment

For our lab meeting this week, we will have Eric Wiewiora speaking to us about some research that he has been following and thinks is very promising for reinforcement learning.

Eric is a student of Gary Cottrell’s, and is the local expert on the current sate of the Reinforcement Learning literature.

As background, he recommends reading:
http://www.eecs.umich.edu/~baveja/Papers/uai2004psr.pdf
http://www.cs.cmu.edu/~ggordon/mrosen-ggordon-thrun.tpsr-icml2004.pdf

The first one is a good motivation, and it is light on math.  The second is a bit more technical, but it demonstrates one algorithm he’ll be talking about.

Abstract: Predictive State Representations

Predictive State Representations (PSRs) have shown a great deal of promise for building models of dynamic environments. PSRs are at least as powerful as Partially Observable Markov Decision Processes (POMDP) and Hidden Markov Models (HMM), but do not suffer from many of their shortcomings.
PSRs model a system based only on observables, and not hidden, latent states. Because of this, a PSR can be learned without falling into local optima.

In spite of these advantages, learning good parameters for a PSR has remained a challenge. This problem can clearly be seen when experimentally comparing state-of-the-art PSR learning algorithms to other standard methods for sequence prediction. I’ll explore the implications of these results, and what can be done to address this shortcoming.

Article about the Robotics Group at Microsoft

Author:movellan @ August 6th, 2007 Leave a Comment

Interesting IEEE Spectrum article about the Microsoft effort on Robotics.

Morning Visit

Author:movellan @ August 3rd, 2007 Leave a Comment

Visited Room 1 at about 10 am. All systems functional and I could use Console2. I started the MIDI module but it was not responsive and also I could not kill it via the console. MIDI is not supposed to be part of this experiment so we shall be ok.

ECEC Update

Author:Cynthia @ August 2nd, 2007 Leave a Comment

I was talking to Tammy at ECEC today, and she said the kids really like playing with and touching Asobo’s head and hands.  She also said that Rhys has been really into playing with him.

Morning Visit

Author:movellan @ August 2nd, 2007 Leave a Comment

Visited Room 1 at 9:00 am. The room was empty but all systems appeared to be operational. However I cant access asobo using Console2.

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