class_docstr: Packed representation of compressed tensors.
  
  This class can pack and unpack several tensor values into a single string. It
  can also optionally store a model identifier.
  
  The tensors currently must be rank 1 (vectors) and either have integer or
  string type.
code: def string(self, value):
      self._example.ParseFromString(value)
  
file_path: compression/tensorflow_compression/python/util/packed_tensors.py
imports: import tensorflow
label_desc: Use image node_id 6 for calling the PackedTensors obj's underlying member method code with example usage: obj.string(value) without return types