message: Fix comment to reflect actual logic.
diff: @@ -191,11 +191,11 @@ class PartitionGraphIntoIndependentNodeSubsetsImpl {
  std::vector<NodeSubset>* node_subsets_;
  std::vector<NodeSubset::Type> node_type_;
  // Maps from tensor index to the epoch in which it is assigned. Also special
  - // negative values of kEpochNotAssigned if not assigned, kEpochNotReady if it
  - // is an input or constant.
  + // negative values of kEpochNotReady if not assigned, kEpochAlwaysReady if it
  + // is an input to the whole model or a constant that has no dependencies.
  std::vector<int> tensor_epochs_;
  // Maps from tensor index to the epoch in which it is assigned. Also special
  - // negative values of kEpochNotAssigned if not assigned.
  + // negative values of kEpochNotReady if not assigned.
  std::vector<int> node_epochs_;
  };
  