message: Removed optional modifiers from oneof fields.
diff: @@ -309,25 +309,25 @@ message ValueProto {
  oneof value {
  // A dense tensor (or scalar).
  - optional TensorProto dense_tensor = 1;
  + TensorProto dense_tensor = 1;
  // A sparse tensor.
  - optional SparseTensorProto sparse_tensor = 2;
  + SparseTensorProto sparse_tensor = 2;
  // A tuple.
  - optional RecordProto record = 3;
  + RecordProto record = 3;
  // A sequence.
  - optional SequenceProto seq = 4;
  + SequenceProto seq = 4;
  // A union.
  - optional UnionProto union = 5;
  + UnionProto union = 5;
  // A map.
  - optional MapProto map = 6;
  + MapProto map = 6;
  // A map.
  - optional ScalarMapProto scalar_map = 7;
  + ScalarMapProto scalar_map = 7;
  }
  }
  