最小二次方时序差分学习
原文地址：
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LSTD
Bradtke and Barto (1996). Linear least-squares algorithms for temporal difference learning.
Geramifard et al (2006). Incremental Least-Squares Temporal Difference Learning.
Szepesv ́ari (2009). Algorithms for Reinforcement Learning.
LSTD(λ)
Boyan (2002). Technical Update: Least-Squares Temporal Difference Learning.
Gehring et al (2016). Incremental Truncated LSTD.
Off-policy LSTD(λ)
Yu (2010). Convergence of Least Squares Temporal Difference Methods Under General Conditions.