witin_mapper is a self-developed compilation software stack for neural network mapping by Witmem. It can map the quantized neural network model to the WTM2101 MPU accelerator. It is a complete solution including RISC-V and MPU, and can complete the transformation and optimization at the operator and graph levels. The pre-training weights are arranged into the computing-memory array, and the computing-memory optimization scheme is given for the network structure and operators. Meanwhile, the operators that are not suitable for MPU operations are scheduled to be operated on the CPU to achieve the scheduling of the entire network, enabling neural network developers to run the trained algorithms on the WTM2101 chip efficiently and quickly. Greatly shorten the development cycle of model transplantation and improve the efficiency of algorithm development.