AbstractTensorInterface* tensor) = 0;
  virtual Status SetAttrStringList(const char* attr_name,
                                   const void* const* values,
                                   const size_t* lengths, int num_values) = 0;
  virtual Status SetAttrStringList(const char* attr_name,
                                   absl::Span<string const> values);

                             size_t length) override;
  Status SetAttrTensor(const char* attr_name,
                       AbstractTensorInterface* tensor) override;
  Status SetAttrStringList(const char* attr_name, const void* const* values,
                           const size_t* lengths, int num_values) override;
  Status SetAttrFloatList(const char* attr_name, const float* values,

                                    AbstractTensorInterface* tensor) {
  return tensorflow::errors::Unimplemented(
      "SetAttrTensor has not been implemented yet.");
}
Status TapeOperation::SetAttrStringList(const char* attr_name,
                                        const void* const* values,
                                        const size_t* lengths, int num_values) {
  std::vector<StringPiece> v(num_values);

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

                     AbstractTensorInterface* tensor,
                     ForwardOperation* forward_op_) {
  return tensorflow::errors::Unimplemented(
      "SetAttrTensor has not been implemented yet.");
}
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.");
  }
  Status SetAttrStringList(const char* attr_name, const void* const* values,
                           const size_t* lengths, int num_values) override {
    if (strcmp(attr_name, tensorflow::kColocationAttrName) == 0) {

                        const std::vector<string>& list) {
    std::unique_ptr<const void*[]> list_ptrs;
    std::unique_ptr<size_t[]> list_lens;
    StringVectorToArrays(list, &list_ptrs, &list_lens);
    TF_SetAttrStringList(desc, tensorflow::kColocationAttrName, list_ptrs.get(),
                         list_lens.get(), list.size());
  }

  void SetViaProto(TF_OperationDescription* desc,

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;
  }
}

// `values` and `lengths` each must have lengths `num_values`.
// `values[i]` must point to a string of length `lengths[i]` bytes.
TF_CAPI_EXPORT extern void TF_SetAttrStringList(TF_OperationDescription* desc,
                                                const char* attr_name,
                                                const void* const* values,

                      const void* value, size_t length) {
  tensorflow::StringPiece s(static_cast<const char*>(value), length);
  desc->node_builder.Attr(attr_name, s);
}

void TF_SetAttrStringList(TF_OperationDescription* desc, const char* attr_name,
                          const void* const* values, const size_t* lengths,
                          int num_values) {