GetComputeNodeInputNum

size_t GetComputeNodeInputNum() const

// 假设已存在KernelContext *context
auto extend_context = reinterpret_cast<ExtendedKernelContext *>(context);
for (size_t idx = 0; idx < extend_context->GetComputeNodeInputNum(); ++idx) {
  auto input_td = extend_context->GetInputDesc(idx);
  // ...
}