µTVM StaticRT CodeGen

This project contains a code generator that produces static C NN inference deployment code targeting tiny micro-controllers (TinyML) as replacement for other µTVM runtimes. This tools generates a runtime, which statically executes the compiled model. This reduces the overhead in terms of code size and execution time compared to having a dynamic on-device runtime.

Requirements

• Install required system packages
• Install required python packages
• Clone TVM
• Apply patches in tvm_patches/
• Build TVM

For detailed commands see CI Config.

Building

The generator is a conventional CMake project.

mkdir build && cd build
cmake ..
cmake --build .

Usage

• Point python to the TVM installation:

  export PYTHONPATH=../tvm/python:${PYTHONPATH}
  

• Generate a graph.json, params.bin and kernels.c file for your model with µTVM. A complete example is shown in this µTVM example script.

• Inspect kernels.c and determine the required workspace size by looking at the TVMBackendAllocWorkspace calls and picking the largest used byte size. If there are no calls, the size should be zero.

• Execute the µTVM StaticRT CodeGen:

  ./utvm_staticrt_codegen graph.json params.bin staticrt.c $WORKSPACE_SIZE
  

• Now the kernels.c and staticrt.c can be compiled together with some calling code into a complete application. An example is given in examples/target_src/.

For detailed commands see example full flow script.