Hi qun,
As per my understanding of the question 'in-place optimization' is a memory optimization technique that uses a single buffer, that is, the same memory to store the input and output data. Every time there is an intermediary output value in the algorithm, the same buffer is overwritten to store this value. This technique optimizes the memory usage and generates code that uses very less memory.
You can refer to the following documentation for a better understanding of the question:
Thanks
