code: def _describe_style(which_styles):
      """Returns a string describing a linear combination of styles."""
  
      def _format(v):
          formatted = str(int(round(v * 1000.0)))
          while len(formatted) < 3:
              formatted = "0" + formatted
          return formatted
  
      values = []
      for k in sorted(which_styles.keys()):
          values.append("%s_%s" % (k, _format(which_styles[k])))
      return "_".join(values)
  
file_path: magenta/magenta/models/image_stylization/image_stylization_transform.py
imports: import ast
  import os
  from magenta.models.image_stylization import image_utils
  from magenta.models.image_stylization import model
  from magenta.models.image_stylization import ops
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 2 for calling a global function with example usage: _describe_style(which_styles) and returns: str, formatted