message: Add a small comment
diff: @@ -68,6 +68,9 @@ class NGraphEncapsulateOp : public tf::OpKernel {
  // d-tor
  }
  + // TODO(amprocte): this needs to be made thread-safe (compilation cache, and
  + // our use of the freshness-tracking stuff probably means we can only execute
  + // one instance at a time).
  void Compute(tf::OpKernelContext* ctx) override {
  // Get the inputs
  std::vector<tf::TensorShape> input_shapes;
  