void check_tensor()

in src/torch_ucc.cpp [136:148]


void check_tensor(const std::vector<at::Tensor>& tensors) {
  if (tensors.size() != 1) {
    throw std::runtime_error("ProcessGroupUCC takes 1 tensor");
  }
  if (!tensors[0].is_contiguous()) {
    throw std::runtime_error(
        "ProcessGroupUCC input tensor has to be contiguous");
  }
  if (tensors[0].is_sparse()) {
    throw std::runtime_error("ProcessGroupUCC input tensor has to be dense");
  }
  // TODO: check cuda case
}