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The current code does not work in py2 since the input string could
contain unicode string, and default encoding in ASCII in py2. Change
the method to only do encode() which convert string to byte array
when running python3.

Edit comment on folder structure to match actual folder structure.

This commit fixes `DeprecationWarning: Please use assertEqual instead.
  self.assertEquals(len(scales_to_logits), expected_num_logits[i])` deprecation warning.

Probable syntax error in line 43. Remove "function" for execution.