message: Explicitly say in comments that new function only updates execution device if it has not yet specified in graf_def
diff: @@ -900,7 +900,9 @@ TF_CAPI_EXPORT extern void TF_DeleteImportGraphDefOptions(
  TF_CAPI_EXPORT extern void TF_ImportGraphDefOptionsSetPrefix(
  TF_ImportGraphDefOptions* opts, const char* prefix);
  -// Set default execution device for the nodes in the `graph_def` that will be imported into `graph`.
  +// Set default execution device for the nodes in the `graph_def`
  +// if it has not been explicitly specified for operation already,
  +// it will be imported into `graph` then.
  // `device` is copied and has no lifetime requirements.
  TF_CAPI_EXPORT extern void TF_ImportGraphDefOptionsSetDefaultDevice(
  TF_ImportGraphDefOptions* opts, const char* device);
  