message: Include a debug prefix on the matmul
diff: @@ -256,7 +256,7 @@ CreateMatMulOp(poplar::Graph &graph,
  in1 = in1.reshape({in1.dim(0), 1});
  }
  - out = poplin::matMul(graph, in0, in1, seq);
  + out = poplin::matMul(graph, in0, in1, seq, inst->name());
  TF_RETURN_IF_ERROR(AddOutputTensor(tensor_map, inst, 0, out));
  