code: def _has_docstring(f):
      return (
          hasattr(f, "__doc__")
          and isinstance(f.__doc__, str)
          and f.__doc__
      )
  
imports: import funcsigs
  import numpy
  import tensorflow.compat.v2
  from trax.tf_numpy.numpy_impl import arrays
  from trax.tf_numpy.numpy_impl import dtypes
label_desc: Use image node_id 9 for calling a global function with example usage: _has_docstring(f) and returns: unknown