message: [XLA:GPU] Mark constructor explicit to comply with C++ style.
diff: @@ -29,7 +29,7 @@ namespace xla {
  class BatchNormExpander : public HloModulePass {
  public:
  // When use_fusion is set, a multi-output fusion node is created.
  - BatchNormExpander(bool rewrite_training_op = false,
  + explicit BatchNormExpander(bool rewrite_training_op = false,
  bool rewrite_inference_op = false,
  bool rewrite_grad_op = false)
  : rewrite_training_op_(rewrite_training_op),
  