message: Add shape propagation for ctcbeamsearchdecoder, it does not do anything since we don't know the outputs until the value is really evaluated.
diff: @@ -2420,6 +2420,10 @@ void ProcessMatrixSetDiagOperator(Model* model, MatrixSetDiagOperator* op) {
  ProcessMatrixSetDiagOperator(model,
  static_cast<MatrixSetDiagOperator*>(op));
  break;
  + case OperatorType::kCTCBeamSearchDecoder:
  + // The sizes of the outputs are only known in runtime based on the input.
  + // Ignore shape progapation here and defer that to the interpreter.
  + break;
  default:
  // Unimplemented, another graph transformation should drop it.
  LOG(FATAL) << "Unhandled operator type " << OperatorTypeName(op->type);
  