message: Register "Snapshot" op inserted by Grappler arithmetic optimization. For (mostly) pure XLA graphs, this op is identical to "Identity".
diff: @@ -40,6 +40,7 @@ REGISTER_XLA_OP(Name("Identity").CompilationOnly(), IdentityOp);
  REGISTER_XLA_OP(Name("IdentityN").CompilationOnly(), IdentityOp);
  REGISTER_XLA_OP(Name("PreventGradient"), IdentityOp);
  REGISTER_XLA_OP(Name("StopGradient"), IdentityOp);
  +REGISTER_XLA_OP(Name("Snapshot"), IdentityOp);
  } // namespace
  } // namespace tensorflow
  