Inquiry about the Meaning of Variable A_true

[Yongkang-Wu]

Dear Developer,

I have been reviewing the code and came across the variable A_true in code 'example' line 71. I would appreciate it if you could kindly clarify what this variable represents and how it is used within the context of the code. Understanding its purpose would greatly assist me in comprehending the functionality of the code.

Thank you in advance for your assistance.