When we first run the tf.Variable.initializer operation for a variable in a session, it is started. It is destroyed when we run the tf.Session.close operation.
The lifetime of a variable refers to the duration during which the variable exists in the memory of a program. The specific lifetime of a variable depends on its scope and storage duration.
- Scope: Scope determines where in the program a variable can be accessed. Variables can have local or global scope.
- Local variables exist only within the block of code in which they are defined (e.g., within a function). Their lifetime starts when the block is entered and ends when the block is exited.
- Global variables, on the other hand, exist throughout the entire program. Their lifetime starts when the program begins execution and ends when the program terminates.
- Storage Duration: Storage duration determines when memory is allocated for the variable and when it is deallocated.
- Variables can have static, automatic, or dynamic storage duration.
- Static variables have a fixed memory allocation throughout the program’s execution, and their lifetime is the entire runtime of the program.
- Automatic variables are allocated when the block containing them is entered and deallocated when the block is exited. Their lifetime is limited to the scope of the block.
- Dynamic variables are allocated and deallocated explicitly by the programmer and can have varying lifetimes depending on how they are managed.
- Variables can have static, automatic, or dynamic storage duration.
In summary, the correct answer would be that the lifetime of a variable depends on its scope and storage duration, ranging from the entire duration of a program’s execution for global variables to the duration of a specific block of code for local variables, with variations based on storage duration.