update projects

projects/codes/SoftActorCritic/env_wrapper.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+# coding=utf-8
+'''
+Author: JiangJi
+Email: johnjim0816@gmail.com
+Date: 2021-04-29 12:52:11
+LastEditor: JiangJi
+LastEditTime: 2021-12-22 15:36:36
+Discription: 
+Environment: 
+'''
+import gym
+import numpy as np
+
+class NormalizedActions(gym.ActionWrapper):
+    def action(self, action):
+        low  = self.action_space.low
+        high = self.action_space.high
+        
+        action = low + (action + 1.0) * 0.5 * (high - low)
+        action = np.clip(action, low, high)
+        
+        return action
+
+    def reverse_action(self, action):
+        low  = self.action_space.low
+        high = self.action_space.high
+        action = 2 * (action - low) / (high - low) - 1
+        action = np.clip(action, low, high)
+        return action