message: Fix tensor which changed to scalar with changes to poplar::Tensor::index()
diff: @@ -73,7 +73,7 @@ template<typename T> \
  class NAME : public Vertex { \
  public: \
  Input<Vector<T>> a; \
  - Input<Vector<T>> b; \
  + Input<T> b; \
  Output<Vector<T>> out; \
  T initval; \
  \
  @@ -85,7 +85,7 @@ public: \
  } \
  } \
  for (unsigned i = 0; i < out.size(); ++i) { \
  - out[i] = (i == selected) ? b[0] : initval; \
  + out[i] = (i == selected) ? b : initval; \
  } \
  return true; \
  } \
  