relay to tir without any schedule

get_lowered_tir.py

"""
  target "lwc" is custom lwc, with only definition, and without any implementation.
"""
def get_lowered_tir(mod):
    """
      Argument
      ========
      mod : IRModule that contains RelayOp only 
      
      Returns
      ========
      ret : IRModule that contains TIR only
    """
    LowerTE = tvm._ffi.get_global_func("relay.tec.LowerTE")
    host_target = tvm.target.Target("llvm")
    prim_target = tvm.target.Target("lwc", host=host_target)
    ctxt = tvm.transform.PassContext()
    config = tvm.target.make_compilation_config(ctxt, prim_target)
    mod = tvm.relay.transform.PlanDevices(config)(mod)
    mod = tvm.relay.transform.FuseOps(fuse_opt_level=0)(mod)
    mod = tvm.relay.transform.InferType()(mod)
    mod = LowerTE("default", config)(mod)
    return mod