fix state values update bug in ch04/policy_eval.py #20
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cutePanda123
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Issue
The existing code has a bug where the state values(array V) is being updated within the loop. As a result, new calculated values are based on the already updated values rather than the original values from previous state. This leads to incorrect calculations.
Fix
This pull request modifies the code to create a copy of the values before performing calculations. Instead of using the updated values within the loop, the new values are now derived from the copied state, ensuring correctness.