RL實踐1——值迭代求解隨機策略
阿新 • • 發佈:2020-09-02
RL實踐1——值迭代求解隨機策略
參考自葉強《強化學習》第三講,方格世界—— 使用 動態規劃 求解隨機策略
動態規劃的使用條件時MDP已知,在簡單遊戲中,這個條件時顯然成立的
使用Value iteration的方法求解每個狀態的價值函式,迭代收斂之後,對應最優策略生成。
問題定義
從方格狀態走到終止狀態(灰色標記)
Python程式碼及註釋
值得注意的是,知乎原版的註釋是錯誤的,採用的是同步更新
有三個trick可以加快運算速度(對於大規模問題)
- in-place DP:新值直接替換舊值,只儲存一個v(s),
- 非同步更新,提高效率
- 缺點:更新順序影響收斂性
- Prioritised sweeping:state的影響力排序
- 比較貝爾曼誤差絕對值,大的更新,小的忽略
- Real-time DP:遍歷過的才更新
- 省去了agent 未遍歷的狀態s,對於稀疏任務效率提升極大
# 狀態集合 states = [i for i in range(16)] # 價值集合 values = [0 for _ in range(16)] # 動作集: actions = ["n", "e", "s", "w"] # 動作字典: ds_actions = {"n": -4, "e": 1, "s": 4, "w": -1} # 衰減率 gamma = 1.00 # 定義MDP def nextState(s, a): next_state = s if (s%4 == 0 and a == "w") or (s<4 and a == "n") or \ ((s+1)%4 == 0 and a == "e") or (s > 11 and a == "s"): pass else: ds = ds_actions[a] next_state = s + ds return next_state # 定義獎勵 def rewardOf(s): return 0 if s in [0, 15] else -1 # 判斷是否結束 def isTerminateState(s): return s in [0, 15] # 獲取所有可能的next state 集合 def getSuccessors(s): successors = [] if isTerminateState(s): return successors for a in actions: next_state = nextState(s, a) # if s != next_state: successors.append(next_state) return successors # 更新當前位置的價值函式 def updateValue(s): sucessors = getSuccessors(s) newValue = 0 # values[s] num = 4 # len(successors) reward = rewardOf(s) for next_state in sucessors: newValue += 1.00 / num * (reward + gamma * values[next_state]) return newValue # 列印所有狀態對應價值函式 def printValue(v): for i in range(16): print('{0:>6.2f}'.format(v[i]), end=" ") if (i + 1) % 4 == 0: print("") print() # 一次迭代 # 這裡採用的是同步更新,不是非同步更新。建立了newvalues陣列,遍歷過states後,統一更新global values def performOneIteration(): newValues = [0 for _ in range(16)] for s in states: newValues[s] = updateValue(s) global values values = newValues printValue(values)
# 主函式
def main():
max_iterate_times = 160
cur_iterate_times = 0
while cur_iterate_times <= max_iterate_times:
print("Iterate No.{0}".format(cur_iterate_times))
performOneIteration()
cur_iterate_times += 1
printValue(values)
if __name__ == '__main__': main()
運算結果如下
Iterate No.0
0.00 -1.00 -1.00 -1.00
-1.00 -1.00 -1.00 -1.00
-1.00 -1.00 -1.00 -1.00
-1.00 -1.00 -1.00 0.00
Iterate No.1
0.00 -1.75 -2.00 -2.00
-1.75 -2.00 -2.00 -2.00
-2.00 -2.00 -2.00 -1.75
-2.00 -2.00 -1.75 0.00
Iterate No.2
0.00 -2.44 -2.94 -3.00
-2.44 -2.88 -3.00 -2.94
-2.94 -3.00 -2.88 -2.44
-3.00 -2.94 -2.44 0.00
Iterate No.3
0.00 -3.06 -3.84 -3.97
-3.06 -3.72 -3.91 -3.84
-3.84 -3.91 -3.72 -3.06
-3.97 -3.84 -3.06 0.00
Iterate No.4
0.00 -3.66 -4.70 -4.91
-3.66 -4.48 -4.78 -4.70
-4.70 -4.78 -4.48 -3.66
-4.91 -4.70 -3.66 0.00
Iterate No.5
0.00 -4.21 -5.51 -5.80
-4.21 -5.22 -5.59 -5.51
-5.51 -5.59 -5.22 -4.21
-5.80 -5.51 -4.21 0.00
Iterate No.6
0.00 -4.73 -6.28 -6.66
-4.73 -5.90 -6.36 -6.28
-6.28 -6.36 -5.90 -4.73
-6.66 -6.28 -4.73 0.00
Iterate No.7
0.00 -5.23 -7.01 -7.47
-5.23 -6.55 -7.09 -7.01
-7.01 -7.09 -6.55 -5.23
-7.47 -7.01 -5.23 0.00
Iterate No.8
0.00 -5.70 -7.70 -8.24
-5.70 -7.16 -7.78 -7.70
-7.70 -7.78 -7.16 -5.70
-8.24 -7.70 -5.70 0.00
Iterate No.9
0.00 -6.14 -8.35 -8.97
-6.14 -7.74 -8.43 -8.35
-8.35 -8.43 -7.74 -6.14
-8.97 -8.35 -6.14 0.00
Iterate No.10
0.00 -6.56 -8.97 -9.66
-6.56 -8.28 -9.04 -8.97
-8.97 -9.04 -8.28 -6.56
-9.66 -8.97 -6.56 0.00
Iterate No.11
0.00 -6.95 -9.56 -10.32
-6.95 -8.80 -9.63 -9.56
-9.56 -9.63 -8.80 -6.95
-10.32 -9.56 -6.95 0.00
Iterate No.12
0.00 -7.33 -10.11 -10.94
-7.33 -9.29 -10.18 -10.11
-10.11 -10.18 -9.29 -7.33
-10.94 -10.11 -7.33 0.00
Iterate No.13
0.00 -7.68 -10.64 -11.53
-7.68 -9.75 -10.70 -10.64
-10.64 -10.70 -9.75 -7.68
-11.53 -10.64 -7.68 0.00
Iterate No.14
0.00 -8.02 -11.14 -12.08
-8.02 -10.19 -11.20 -11.14
-11.14 -11.20 -10.19 -8.02
-12.08 -11.14 -8.02 0.00
Iterate No.15
0.00 -8.34 -11.61 -12.61
-8.34 -10.61 -11.66 -11.61
-11.61 -11.66 -10.61 -8.34
-12.61 -11.61 -8.34 0.00
Iterate No.16
0.00 -8.64 -12.06 -13.11
-8.64 -11.00 -12.11 -12.06
-12.06 -12.11 -11.00 -8.64
-13.11 -12.06 -8.64 0.00
Iterate No.17
0.00 -8.92 -12.48 -13.58
-8.92 -11.37 -12.53 -12.48
-12.48 -12.53 -11.37 -8.92
-13.58 -12.48 -8.92 0.00
Iterate No.18
0.00 -9.19 -12.88 -14.03
-9.19 -11.73 -12.93 -12.88
-12.88 -12.93 -11.73 -9.19
-14.03 -12.88 -9.19 0.00
Iterate No.19
0.00 -9.45 -13.26 -14.45
-9.45 -12.06 -13.30 -13.26
-13.26 -13.30 -12.06 -9.45
-14.45 -13.26 -9.45 0.00
Iterate No.20
0.00 -9.69 -13.62 -14.86
-9.69 -12.38 -13.66 -13.62
-13.62 -13.66 -12.38 -9.69
-14.86 -13.62 -9.69 0.00
Iterate No.21
0.00 -9.92 -13.96 -15.24
-9.92 -12.67 -14.00 -13.96
-13.96 -14.00 -12.67 -9.92
-15.24 -13.96 -9.92 0.00
Iterate No.22
0.00 -10.14 -14.28 -15.60
-10.14 -12.96 -14.32 -14.28
-14.28 -14.32 -12.96 -10.14
-15.60 -14.28 -10.14 0.00
Iterate No.23
0.00 -10.34 -14.58 -15.94
-10.34 -13.23 -14.62 -14.58
-14.58 -14.62 -13.23 -10.34
-15.94 -14.58 -10.34 0.00
Iterate No.24
0.00 -10.54 -14.87 -16.26
-10.54 -13.48 -14.90 -14.87
-14.87 -14.90 -13.48 -10.54
-16.26 -14.87 -10.54 0.00
Iterate No.25
0.00 -10.72 -15.14 -16.56
-10.72 -13.72 -15.17 -15.14
-15.14 -15.17 -13.72 -10.72
-16.56 -15.14 -10.72 0.00
Iterate No.26
0.00 -10.90 -15.40 -16.85
-10.90 -13.95 -15.43 -15.40
-15.40 -15.43 -13.95 -10.90
-16.85 -15.40 -10.90 0.00
Iterate No.27
0.00 -11.06 -15.65 -17.13
-11.06 -14.16 -15.67 -15.65
-15.65 -15.67 -14.16 -11.06
-17.13 -15.65 -11.06 0.00
Iterate No.28
0.00 -11.22 -15.88 -17.39
-11.22 -14.37 -15.90 -15.88
-15.88 -15.90 -14.37 -11.22
-17.39 -15.88 -11.22 0.00
Iterate No.29
0.00 -11.37 -16.10 -17.63
-11.37 -14.56 -16.12 -16.10
-16.10 -16.12 -14.56 -11.37
-17.63 -16.10 -11.37 0.00
Iterate No.30
0.00 -11.51 -16.30 -17.86
-11.51 -14.74 -16.33 -16.30
-16.30 -16.33 -14.74 -11.51
-17.86 -16.30 -11.51 0.00
Iterate No.31
0.00 -11.64 -16.50 -18.08
-11.64 -14.92 -16.52 -16.50
-16.50 -16.52 -14.92 -11.64
-18.08 -16.50 -11.64 0.00
Iterate No.32
0.00 -11.76 -16.69 -18.29
-11.76 -15.08 -16.71 -16.69
-16.69 -16.71 -15.08 -11.76
-18.29 -16.69 -11.76 0.00
Iterate No.33
0.00 -11.88 -16.86 -18.49
-11.88 -15.24 -16.88 -16.86
-16.86 -16.88 -15.24 -11.88
-18.49 -16.86 -11.88 0.00
Iterate No.34
0.00 -12.00 -17.03 -18.68
-12.00 -15.38 -17.05 -17.03
-17.03 -17.05 -15.38 -12.00
-18.68 -17.03 -12.00 0.00
Iterate No.35
0.00 -12.10 -17.19 -18.85
-12.10 -15.52 -17.21 -17.19
-17.19 -17.21 -15.52 -12.10
-18.85 -17.19 -12.10 0.00
Iterate No.36
0.00 -12.20 -17.34 -19.02
-12.20 -15.65 -17.36 -17.34
-17.34 -17.36 -15.65 -12.20
-19.02 -17.34 -12.20 0.00
Iterate No.37
0.00 -12.30 -17.48 -19.18
-12.30 -15.78 -17.50 -17.48
-17.48 -17.50 -15.78 -12.30
-19.18 -17.48 -12.30 0.00
Iterate No.38
0.00 -12.39 -17.61 -19.33
-12.39 -15.90 -17.63 -17.61
-17.61 -17.63 -15.90 -12.39
-19.33 -17.61 -12.39 0.00
Iterate No.39
0.00 -12.47 -17.74 -19.47
-12.47 -16.01 -17.76 -17.74
-17.74 -17.76 -16.01 -12.47
-19.47 -17.74 -12.47 0.00
Iterate No.40
0.00 -12.56 -17.86 -19.61
-12.56 -16.12 -17.87 -17.86
-17.86 -17.87 -16.12 -12.56
-19.61 -17.86 -12.56 0.00
Iterate No.41
0.00 -12.63 -17.97 -19.73
-12.63 -16.22 -17.99 -17.97
-17.97 -17.99 -16.22 -12.63
-19.73 -17.97 -12.63 0.00
Iterate No.42
0.00 -12.71 -18.08 -19.85
-12.71 -16.31 -18.09 -18.08
-18.08 -18.09 -16.31 -12.71
-19.85 -18.08 -12.71 0.00
Iterate No.43
0.00 -12.77 -18.18 -19.97
-12.77 -16.40 -18.20 -18.18
-18.18 -18.20 -16.40 -12.77
-19.97 -18.18 -12.77 0.00
Iterate No.44
0.00 -12.84 -18.28 -20.08
-12.84 -16.49 -18.29 -18.28
-18.28 -18.29 -16.49 -12.84
-20.08 -18.28 -12.84 0.00
Iterate No.45
0.00 -12.90 -18.37 -20.18
-12.90 -16.57 -18.38 -18.37
-18.37 -18.38 -16.57 -12.90
-20.18 -18.37 -12.90 0.00
Iterate No.46
0.00 -12.96 -18.46 -20.28
-12.96 -16.64 -18.47 -18.46
-18.46 -18.47 -16.64 -12.96
-20.28 -18.46 -12.96 0.00
Iterate No.47
0.00 -13.02 -18.54 -20.37
-13.02 -16.71 -18.55 -18.54
-18.54 -18.55 -16.71 -13.02
-20.37 -18.54 -13.02 0.00
Iterate No.48
0.00 -13.07 -18.62 -20.45
-13.07 -16.78 -18.63 -18.62
-18.62 -18.63 -16.78 -13.07
-20.45 -18.62 -13.07 0.00
Iterate No.49
0.00 -13.12 -18.69 -20.54
-13.12 -16.85 -18.70 -18.69
-18.69 -18.70 -16.85 -13.12
-20.54 -18.69 -13.12 0.00
Iterate No.50
0.00 -13.16 -18.76 -20.61
-13.16 -16.91 -18.77 -18.76
-18.76 -18.77 -16.91 -13.16
-20.61 -18.76 -13.16 0.00
Iterate No.51
0.00 -13.21 -18.83 -20.69
-13.21 -16.97 -18.84 -18.83
-18.83 -18.84 -16.97 -13.21
-20.69 -18.83 -13.21 0.00
Iterate No.52
0.00 -13.25 -18.89 -20.76
-13.25 -17.02 -18.90 -18.89
-18.89 -18.90 -17.02 -13.25
-20.76 -18.89 -13.25 0.00
Iterate No.53
0.00 -13.29 -18.95 -20.82
-13.29 -17.07 -18.96 -18.95
-18.95 -18.96 -17.07 -13.29
-20.82 -18.95 -13.29 0.00
Iterate No.54
0.00 -13.33 -19.00 -20.89
-13.33 -17.12 -19.01 -19.00
-19.00 -19.01 -17.12 -13.33
-20.89 -19.00 -13.33 0.00
Iterate No.55
0.00 -13.36 -19.06 -20.95
-13.36 -17.17 -19.06 -19.06
-19.06 -19.06 -17.17 -13.36
-20.95 -19.06 -13.36 0.00
Iterate No.56
0.00 -13.40 -19.11 -21.00
-13.40 -17.21 -19.11 -19.11
-19.11 -19.11 -17.21 -13.40
-21.00 -19.11 -13.40 0.00
Iterate No.57
0.00 -13.43 -19.16 -21.05
-13.43 -17.26 -19.16 -19.16
-19.16 -19.16 -17.26 -13.43
-21.05 -19.16 -13.43 0.00
Iterate No.58
0.00 -13.46 -19.20 -21.10
-13.46 -17.30 -19.21 -19.20
-19.20 -19.21 -17.30 -13.46
-21.10 -19.20 -13.46 0.00
Iterate No.59
0.00 -13.49 -19.24 -21.15
-13.49 -17.33 -19.25 -19.24
-19.24 -19.25 -17.33 -13.49
-21.15 -19.24 -13.49 0.00
Iterate No.60
0.00 -13.52 -19.28 -21.20
-13.52 -17.37 -19.29 -19.28
-19.28 -19.29 -17.37 -13.52
-21.20 -19.28 -13.52 0.00
Iterate No.61
0.00 -13.54 -19.32 -21.24
-13.54 -17.40 -19.33 -19.32
-19.32 -19.33 -17.40 -13.54
-21.24 -19.32 -13.54 0.00
Iterate No.62
0.00 -13.57 -19.36 -21.28
-13.57 -17.43 -19.36 -19.36
-19.36 -19.36 -17.43 -13.57
-21.28 -19.36 -13.57 0.00
Iterate No.63
0.00 -13.59 -19.39 -21.32
-13.59 -17.46 -19.40 -19.39
-19.39 -19.40 -17.46 -13.59
-21.32 -19.39 -13.59 0.00
Iterate No.64
0.00 -13.61 -19.42 -21.36
-13.61 -17.49 -19.43 -19.42
-19.42 -19.43 -17.49 -13.61
-21.36 -19.42 -13.61 0.00
Iterate No.65
0.00 -13.63 -19.45 -21.39
-13.63 -17.52 -19.46 -19.45
-19.45 -19.46 -17.52 -13.63
-21.39 -19.45 -13.63 0.00
Iterate No.66
0.00 -13.65 -19.48 -21.42
-13.65 -17.54 -19.49 -19.48
-19.48 -19.49 -17.54 -13.65
-21.42 -19.48 -13.65 0.00
Iterate No.67
0.00 -13.67 -19.51 -21.45
-13.67 -17.57 -19.51 -19.51
-19.51 -19.51 -17.57 -13.67
-21.45 -19.51 -13.67 0.00
Iterate No.68
0.00 -13.69 -19.54 -21.48
-13.69 -17.59 -19.54 -19.54
-19.54 -19.54 -17.59 -13.69
-21.48 -19.54 -13.69 0.00
Iterate No.69
0.00 -13.70 -19.56 -21.51
-13.70 -17.61 -19.56 -19.56
-19.56 -19.56 -17.61 -13.70
-21.51 -19.56 -13.70 0.00
Iterate No.70
0.00 -13.72 -19.58 -21.54
-13.72 -17.63 -19.59 -19.58
-19.58 -19.59 -17.63 -13.72
-21.54 -19.58 -13.72 0.00
Iterate No.71
0.00 -13.73 -19.61 -21.56
-13.73 -17.65 -19.61 -19.61
-19.61 -19.61 -17.65 -13.73
-21.56 -19.61 -13.73 0.00
Iterate No.72
0.00 -13.75 -19.63 -21.58
-13.75 -17.67 -19.63 -19.63
-19.63 -19.63 -17.67 -13.75
-21.58 -19.63 -13.75 0.00
Iterate No.73
0.00 -13.76 -19.65 -21.61
-13.76 -17.69 -19.65 -19.65
-19.65 -19.65 -17.69 -13.76
-21.61 -19.65 -13.76 0.00
Iterate No.74
0.00 -13.77 -19.67 -21.63
-13.77 -17.71 -19.67 -19.67
-19.67 -19.67 -17.71 -13.77
-21.63 -19.67 -13.77 0.00
Iterate No.75
0.00 -13.79 -19.68 -21.65
-13.79 -17.72 -19.69 -19.68
-19.68 -19.69 -17.72 -13.79
-21.65 -19.68 -13.79 0.00
Iterate No.76
0.00 -13.80 -19.70 -21.67
-13.80 -17.74 -19.70 -19.70
-19.70 -19.70 -17.74 -13.80
-21.67 -19.70 -13.80 0.00
Iterate No.77
0.00 -13.81 -19.72 -21.68
-13.81 -17.75 -19.72 -19.72
-19.72 -19.72 -17.75 -13.81
-21.68 -19.72 -13.81 0.00
Iterate No.78
0.00 -13.82 -19.73 -21.70
-13.82 -17.76 -19.73 -19.73
-19.73 -19.73 -17.76 -13.82
-21.70 -19.73 -13.82 0.00
Iterate No.79
0.00 -13.83 -19.75 -21.72
-13.83 -17.78 -19.75 -19.75
-19.75 -19.75 -17.78 -13.83
-21.72 -19.75 -13.83 0.00
Iterate No.80
0.00 -13.84 -19.76 -21.73
-13.84 -17.79 -19.76 -19.76
-19.76 -19.76 -17.79 -13.84
-21.73 -19.76 -13.84 0.00
Iterate No.81
0.00 -13.85 -19.77 -21.75
-13.85 -17.80 -19.77 -19.77
-19.77 -19.77 -17.80 -13.85
-21.75 -19.77 -13.85 0.00
Iterate No.82
0.00 -13.85 -19.78 -21.76
-13.85 -17.81 -19.79 -19.78
-19.78 -19.79 -17.81 -13.85
-21.76 -19.78 -13.85 0.00
Iterate No.83
0.00 -13.86 -19.80 -21.77
-13.86 -17.82 -19.80 -19.80
-19.80 -19.80 -17.82 -13.86
-21.77 -19.80 -13.86 0.00
Iterate No.84
0.00 -13.87 -19.81 -21.78
-13.87 -17.83 -19.81 -19.81
-19.81 -19.81 -17.83 -13.87
-21.78 -19.81 -13.87 0.00
Iterate No.85
0.00 -13.88 -19.82 -21.80
-13.88 -17.84 -19.82 -19.82
-19.82 -19.82 -17.84 -13.88
-21.80 -19.82 -13.88 0.00
Iterate No.86
0.00 -13.88 -19.83 -21.81
-13.88 -17.85 -19.83 -19.83
-19.83 -19.83 -17.85 -13.88
-21.81 -19.83 -13.88 0.00
Iterate No.87
0.00 -13.89 -19.84 -21.82
-13.89 -17.86 -19.84 -19.84
-19.84 -19.84 -17.86 -13.89
-21.82 -19.84 -13.89 0.00
Iterate No.88
0.00 -13.90 -19.84 -21.83
-13.90 -17.86 -19.85 -19.84
-19.84 -19.85 -17.86 -13.90
-21.83 -19.84 -13.90 0.00
Iterate No.89
0.00 -13.90 -19.85 -21.84
-13.90 -17.87 -19.85 -19.85
-19.85 -19.85 -17.87 -13.90
-21.84 -19.85 -13.90 0.00
Iterate No.90
0.00 -13.91 -19.86 -21.84
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