virtual absl::Status SetAttrStringList(const char* attr_name,
                                         const void* const* values,
                                         const size_t* lengths,
                                         int num_values) = 0;
  virtual absl::Status SetAttrStringList(const char* attr_name,

                                 ForwardOperation*);
absl::Status SetAttrTensor(AbstractOperation*, const char* attr_name,
                           AbstractTensorInterface* tensor, ForwardOperation*);
absl::Status SetAttrStringList(AbstractOperation*, const char* attr_name,
                               const void* const* values, const size_t* lengths,
                               int num_values, ForwardOperation*);

                           ForwardOperation* forward_op_) {
  return absl::UnimplementedError(
      "SetAttrTensor has not been implemented yet.");
}
absl::Status SetAttrStringList(AbstractOperation* op_, const char* attr_name,
                               const void* const* values, const size_t* lengths,
                               int num_values, ForwardOperation* forward_op_) {

                             AbstractTensorInterface* tensor) override {
    return tensorflow::errors::Unimplemented(
        "SetAttrTensor has not been implemented yet.");
  }
  absl::Status SetAttrStringList(const char* attr_name,
                                 const void* const* values,
                                 const size_t* lengths,
                                 int num_values) override {

void TFE_OpSetAttrStringList(TFE_Op* op, const char* attr_name,
                             const void* const* values, const size_t* lengths,
                             int num_values) {
  auto s = tensorflow::unwrap(op)->SetAttrStringList(attr_name, values, lengths,
                                                     num_values);
  if (!s.ok()) {
    LOG(WARNING) << "Unable to set attribute: " << attr_name;
  }
}