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#ifndef SINGA_UTILS_MKLDNN_UTILS_H_
#define SINGA_UTILS_MKLDNN_UTILS_H_

namespace singa {

using namespace dnnl;

inline dnnl::memory::format_tag get_dnnl_format_tag(const Tensor &x) {
  memory::format_tag format_tag_;
  switch (x.nDim()) {
    case 1: {
      format_tag_ = memory::format_tag::a;
      break;
    }
    case 2: {
      format_tag_ = memory::format_tag::ab;
      break;
    }
    case 3: {
      format_tag_ = memory::format_tag::abc;
      break;
    }
    case 4: {
      format_tag_ = memory::format_tag::abcd;
      break;
    }
    default: {
      LOG(FATAL) << x.nDim() << " dim is not supported";
    }
  }
  return format_tag_;
}
}  // namespace singa
#endif  // SINGA_UTILS_MKLDNN_UTILS_H_