I wanted to find out if the ARM NN supports the ARM Mali 400 MP2 .
Hi Fatima, The ARM Mali-400 GPU has no support for OpenCL so it will not work with the 'GPU' backend of ArmNN.
ArmNN uses the OpenCL configuration of Arm's Compute Library for GPU acceleration. You can find out the hardware and driver requirements of it here: https://arm-software.github.io/ComputeLibrary/latest/#S3_8_cl_requirements
All the best,