code: def is_complex(dtype):
      """Returns whether this is a complex floating point type."""
      return np.issubdtype(np.dtype(dtype), np.complexfloating)
  
file_path: probability/tensorflow_probability/python/internal/backend/numpy/_utils.py
imports: import functools
  import importlib
  import types
  import numpy
  from tensorflow_probability.python.internal.backend.numpy import nest
label_desc: Use image node_id 5 for calling a global function with example usage: is_complex(dtype) and returns: np