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Frequently Asked Questions

Who invented RL?

RL FAQ
There is plenty of blame here to go around. Minsky, Bellman, Howard, Andreae, Werbos, Barto, Sutton, Watkins... All played important or early roles. See the history from the Sutton and Barto text.
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Who is R.L.?

The Unofficial Kevin and Kell FAQ
R.L. was Kell's boss at HerdThinners, Inc. He may be a wolf; he's only seen as fangs and hands. He is 'fifty-ish'. While he is an adept manager and savage predator, he is not particularly computer-literate. He is another secret sufferer from Domestication, a malady and secret that he shares with Kell and Rudy. His predecessor at HerdThinners was named 'L.D.'. R.L. is married to Angelique, Kevin's ex.
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How does RL relate to Neuroscience?

RL FAQ
Ideally, the ideas of reinforcement learning could constitute part of a computational theory of what the brain is doing and why. A number of links have been drawn between reinforcement learning and neuroscience, beginning with early models of classical conditioning based on temporal-difference learning (see Barto and Sutton, 1982; Sutton and Barto, 1981, 1990; Moore et al., 1986), and continuing through work on foraging and prediction learning (see Montague et al.
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How does RL relate to behaviorism?

RL FAQ
Formally, RL is unrelated to behaviorism, or at least to the aspects of behaviorism that are widely viewed as undesireable. Behaviorism has been disparaged for focusing exclusively on behavior, refusing to consider what was going on inside the head of the subject. RL of course is all about the algorithms and processes going on inside the agent. For example, we often consider the construction of internal models of the environment within the agent, which is far outside the scope of behaviorism.
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featherhawk essences * Answers to Frequently Asked Questions
Flower essences were first developed in the 1930's by the English physician, Edward Bach. Dr. Bach was a classically trained physician who became a pioneer in understanding the relationship of emotions to the health of body and mind. Today we call this the "body/mind connection." You can also use the tongue-twister, "psychoneuroimmunology." He observed that many physical diseases could be directly related to a person's mental attitude.
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Pyranha Insecticides Inc. / Frequently Asked Questions
Carl Cunningham, Pyranha Incorporated’s founder created and patented the first automatic misting system in 1972 for the control of flies in horse barns and called it SprayMaster™ . More than three decades later the basic SprayMaster™ design is still the model for all misting systems in the market.
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Who invented RESPeRATE?

Lower Blood Pressure with RESPeRATE - FAQ
Dr. Benjamin Gavish, InterCure's Founder and Chief Scientific Officer, patented and developed a fundamental method of affecting biological rhythms and respiration with external rhythms such as melody, which led to the development of RESPeRATE, the company's first product.
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Who invented aerogel?

Stardust - Frequently Asked Questions
Aerogel was first made in the 1930s by Samuel S. Kistler, who obtained several patents for making a variety of aerogel, including silica, alumina, chromia, tin and carbon.
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When was the call invented?

Cass Creek International
Cass Creek Calls have been on the drawing board for over 10 years. The unique features of the call set it apart from other calls. The patent was filed in the spring of 2002, having both a national and international patent pending.
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Untitled Document
acoustical engineer wanted to test the timing accuracy of professional musicians. He put a metronome beat at a slow pace into headphones ? 54 beats per minute ? slower than the slowest paced music, Baroque ? and had them tap hand and foot sensors for a computer to measure how accurate they were to "perfect timing." He was able to measure with high precision - to the ten thousands of a second ahead and behind the perfect beat.
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How does RL relate to Neuro-Dynamic Programming?

RL FAQ
To a first approximation, Reinforcement Learning and Neuro-Dynamic Programming are synonomous. The name "reinforcement learning" came from psychology (although psychologists rarely use exactly this term) and dates back to the eary days of cybernetics. For example, Marvin Minsky used this term in his 1954 thesis, and Barto and Sutton revived it in the early 1980's.
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How does RL relate to the psychology of animal behavior?

RL FAQ
Broadly speaking, RL works as a pretty good model of instrumental learning, though a detailed argument for this has never been publically made (the closest to this is probably Barto, Sutton and Watkins, 1990). On the other hand, the links between classical (or Pavlovian) conditioning and temporal-difference (TD) learning (one of the central elements of RL) are close and widely acknowledged (see Sutton and Barto, 1990).
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How does RL relate to genetic algorithms?

RL FAQ
Most work with genetic algorithms simulates evolution, not learning during an individual's life, and because of this is very different from work in RL. That having been said, there are two provisos. First, there is a large body of work on classifier systems that uses or is closely related to genetic algorithms. This work is concerned with learning during a single agent's lifetime (using GAs to organize the components of the agent's mind) and is in fact RL research.
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My state and/or action space is huge! Can I still apply RL?

RL FAQ
Function approximation" refers to the use of a parameterized functional form to represent the value function (and/or the policy), as opposed to a simple table. A table is able to represent the value of each state separately, without confusion, interaction, or generalization with the value of any other state. In typical problems, however, there are far too many states to learn or represent their values individually; instead we have to generalize from observed to states to new, unobserved ones.
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Is RL just trial-and-error learning, or does it include planning?

RL FAQ
Modern reinforcement learning concerns both trial-and-error learning without a model of the environment, and deliberative planning with a model. By "a model" here we mean a model of the dynamics of the environment. In the simplest case, this means just an estimate of the state-transition probabilities and expected immediate rewards of the environment. In general it means any predictions about the environment's future behavior conditional on the agent's behavior.
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What advantages does RL offer in Operations Research problems?

RL FAQ
Using function approximation, RL can apply to much larger state spaces than classical sequential optimization techniques such as dynamic programming. In addition, using simulations (sampling), RL can apply to systems that are too large or complicated to explicitly enumerate the next-state transition probabilities.
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Most RL work assumes the action space is discrete; what about continuous actions?

RL FAQ
It is true that most RL work has considered discrete action spaces, but this was usually done for convenience, not as an essential limitation of the ideas; and there are exceptions. Nevertheless, it is often not obvious how to extend RL methods to continuous, or even large discrete, action spaces. The key problem is that RL methods typically involve a max or sum over elements of the action space, which is not feasible if the space is large or infinite.
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I am doing RL with a backpropagation neural network and it doesn't work; what should I do?

RL FAQ
It is a common error to use a backpropagation neural network as the function approximator in one's first experiments with reinforcement learning, which almost always leads to an unsatisfying failure. The primary reason for the failure is that backpropation is fairly tricky to use effectively, doubly so in an online application like reinforcement learning.
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Who invented essences?

Flower Remedies Vibrational Essences - The World Wide Essenc...
Vibrational essences are a part of ancient wisdom, and have been found in aboriginal cultures throughout the world. The 16th century master physician and herbalist Paracelsus also used essences. The best-known essence maker of the modern world is the English physician Dr. Edward Bach. He re-invented essences in the 1930's, creating the popular Bach Flower Remedies. They are used widely throughout the world. In the past 15 years or so, many new essences companies were founded all over the world.
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Question: Who invented Decompression Therapy?

Irving Texas Leader for Decompression Therapy & Back Pai...
Answer:It was developed by Dr. Allen Dyer, a world-renowned medical researcher who invented the cardiac defibrillator that went around the globe to revive heart attack victims. Dr. Dyer holds an M.D., a Ph.D. and a pharmaceutical degree. He is the former deputy minister with the Ministry of Health in Ontario, Canada.
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WHEN WERE BALLOONS INVENTED?

FAQ
Balloons have been around for centuries.  The modern latex balloon that we are familiar with was invented in New England during the Great Depression. A chemical engineer named Neil Tillotson was attempting to make inner tubes using liquid latex, which was a new product.  He was having no luck.  In his frustration is cut out a cat's head and dipped it in the latex.  When it dried he found that he had a cat head.
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Who invented geocaching?

Buxley's Geocaching Waypoint - Frequently Asked Questions
The first cache was placed by Dave Ulmer near Portland, Oregon on May 3rd, 2000. Three days later, two people who had read about the cache on the sci.geo.satellite-nav newsgroup found the cache and entered their names in its log: geocaching was born! You are welcome to link to any of my pages from your web site but please do not place copies of this site's maps on your own web page. Geocache data has been gathered from geocaching.com, navicache.com, and other sources. We thank them all!
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Who invented Preterism?

Frequently Asked Questions - Preterism.com -- English
Answer: The short answer is Jesus Christ; Jesus (followed by all his disciples) was the one teaching a first-century Second Coming. The long answer is that Preterism has always been a minor voice throughout Church history. Church fathers like Eusebius of Caesarea, St. John Chrysostom, St. Basil the Great and many others were either Preterists or showed strong Preteristic tendencies.
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Another seller claims he invented it. What are the facts?

eBay Store - Best Buy By Far: FAQ
Microdermabrasion products of microfiber are one of the hottest items on eBay for one simple reason. ? They work, and they work extraordinarily well. ? For that reason there are many sellers promoting microfiber products.
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How and why was the piano invented?

The Piano Education Page - Piano Frequently Asked Questions ...
The mechanical genius Bartolomeo Cristofori invented the piano around 1700. The name piano is actually a shortened version of the Italian term pianoforte, meaning soft-loud, and referring to the fact that the pianoforte could produce sound volume covering a much larger range than its predecessors, the harpsichord and clavichord.
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