code: def isnat(obj):
      """
      Check if a value is np.NaT.
      """
      if obj.dtype.kind not in ("m", "M"):
          raise ValueError("%s is not a numpy datetime or timedelta")
      return obj.view(int64_dtype) == iNaT
  
imports: from collections import OrderedDict
  from datetime import datetime
  from distutils.version import StrictVersion
  from warnings import catch_warnings, filterwarnings
  import six
  import numpy
  from numpy import array_equal, broadcast, busday_count, datetime64, diff, dtype, empty, flatnonzero, hstack, isnan, nan, vectorize, where
  from numpy.lib.stride_tricks import as_strided
  from toolz import flip
label_desc: Use image node_id 10 for calling a global function with example usage: isnat(obj) and returns: unknown