message: Defend against the second argument to Dot having rank=1
diff: @@ -300,6 +300,10 @@ CreateMatMulOp(poplar::Graph &graph,
  in0 = in0.reshape({1, in0.dim(0)});
  }
  + if (in1.rank() == 1) {
  + in1 = in1.reshape({in1.dim(0), 1});
  + }
  +
  out = poplin::matMul(graph, in0, in1, seq);
  TF_RETURN_IF_ERROR(AddOutputTensor(tensor_map, inst, 0, out));
  