code: def __lt__(self, other):
      if not isinstance(other, TensorSpec):
          return NotImplementedError
      return self.tuple() < other.tuple()
  
imports: from functools import total_ordering
  import numpy
  import tensorflow
  from tensorforce import TensorforceError, util
  from tensorforce.core.utils import tf_util
label_desc: Use image node_id 22 for calling the TensorSpec obj's underlying member method code with example usage: obj.__lt__(other) and returns: unknown, NotImplementedError