TF_Status* status);

// Set an op's attribute from a serialized AttrValue protocol buffer.
//
// Analogous to TF_SetAttrValueProto for building graph operations.
TF_CAPI_EXPORT extern void TFE_OpSetAttrValueProto(const TFE_Op* op,
                                                   const char* attr_name,

// `proto` should point to a sequence of bytes of length `proto_len`
// representing a binary serialization of an AttrValue protocol
// buffer.
TF_CAPI_EXPORT extern void TF_SetAttrValueProto(TF_OperationDescription* desc,
                                                const char* attr_name,
                                                const void* proto,

    tensorflow::AttrValue attr;
    for (const string& v : list) {
      attr.mutable_list()->add_s(v);
    }
    string bytes;
    attr.SerializeToString(&bytes);
    TF_SetAttrValueProto(desc, tensorflow::kColocationAttrName, bytes.data(),
                         bytes.size(), s_);
    ASSERT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);
  }

  void VerifyCollocation(TF_Operation* op,

    Tensor v;
    status->status = TF_TensorToTensor(values[i], &v);
    t.emplace_back(v);
  }

  if (status->status.ok()) desc->node_builder.Attr(attr_name, t);
}

void TF_SetAttrValueProto(TF_OperationDescription* desc, const char* attr_name,
                          const void* proto, size_t proto_len,
                          TF_Status* status) {
  tensorflow::AttrValue attr_value;