rizes string into different
 classes. The API expects a Bert based TFLite model with metadata populated.

 <p>The metadata should contain the following information:

 <ul>
<li>1 input_process_unit for Wordpiece/Sentencepiece Tokenizer.
   <li>3 input tensors with names "ids", "mask" and "segment_ids".
   <li>1 output tensor of type float32[1, 2], with a optionally attached label file. If a label
       file is attached, the file should be a plain text file with one label per line, the number
       of label