// GCS. Specified in MB (e.g. "16" = 16 x 1024 x 1024 = 16777216 bytes).
constexpr char kBlockSize[] = "GCS_READ_CACHE_BLOCK_SIZE_MB";
constexpr size_t kDefaultBlockSize = 64 * 1024 * 1024;
// The environment variable that overrides the max size of the LRU cache of
// blocks read from GCS. Specified in MB.
constexpr char kMaxCacheSize[] = "GCS_READ_CACHE_MAX_SIZE_MB";
constexpr size_t kDefaultMaxCacheSize = 0;

    auto virtual_devices =
        gpu_options->mutable_experimental()->add_virtual_devices();
    for (int i = 0; i < num_virtual_gpus; ++i) {
      virtual_devices->add_memory_limit_mb(200);
    }
  }
  return server_def;
}

TFE_TensorHandle* CreateVarHandle(TFE_Context* ctx,
                                  const tensorflow::string& device_name,

        methods.
*   TensorFlow Debugger (tfdbg) CLI: fix an issue in which the TensorBoard
    Debugger Plugin could not handle total source file size exceeding gRPC
    message size limit (4 MB).
*   `tf.contrib`:
    *   `tf.contrib.framework.zero_initializer` supports ResourceVariable.
    *   Adding "constrained_optimization" to tensorflow/contrib.
*   Other:
    *   Add GCS Configuration Ops.