message: Log all valid visible cuda gpu id in one line.
diff: @@ -1297,9 +1297,15 @@ Status BaseGPUDeviceFactory::GetValidDeviceIds(
  "TF_MIN_GPU_MULTIPROCESSOR_COUNT.";
  continue;
  }
  - LOG(INFO) << "Adding visible gpu device " << visible_gpu_id;
  ids->push_back(visible_gpu_id);
  }
  + if (!ids->empty()) {
  + std::vector<int> raw_ids(ids->size());
  + std::transform(ids->begin(), ids->end(), raw_ids.begin(),
  + [](CudaGpuId id) -> int { return id.value(); });
  + LOG(INFO) << "Adding visible gpu devices: "
  + << str_util::Join(raw_ids, ", ");
  + }
  return Status::OK();
  }
  