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The overall view of planning and learning presented here has gradually developed over a number of years, in part by the authors (Sutton, 1990, 1991a, 1991b; Barto, Bradtke, and Singh, 1991, 1995; Sutton and Pinette, 1985; Barto and Sutton, 1981b), but also strongly influenced by Agre and Chapman (1990; Agre 1988), Bertsekas and Tsitsiklis (1989), Singh (1994), and others. The authors were also strongly influenced by psychological studies of latent learning (Tolman, 1932) and by psychological views of the nature of thought (e.g., Galanter and Gerstenhaber, 1956; Craik, 1943; Campbell, 1959; Dennett, 1978).
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and 9
.3
The terms direct and indirect, which we use to describe different kinds of reinforcement learning, are from the adaptive control literature (e.g., Goodwin and Sin, 1984), where they are used to make the same kind of distinction. The term system identification is used in adaptive control for what we call model learning (e.g., Goodwin and Sin, 1984; Ljung and Söderstrom, 1983; Young, 1984). The Dyna architecture is due to Sutton (1990), and the results in these sections are based on results reported there.
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Prioritized sweeping was developed simultaneously and independently by Moore and Atkeson (1993) and Peng and Williams (1993). The results in Figure 9.10 are due to Peng and Williams (1993). The results in Figure 9.11 are due to Moore and Akteson.
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This section was strongly influenced by the experiments of Singh (1994).
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For further reading on heuristic search, the reader is encouraged to consult texts and surveys such as those by Russell and Norvig (1995) and Korf (1988). Peng and Williams (1993) explored a forward focusing of backups much as is suggested in this section.