code: def sum_over_features(self):
      return self._sum_over_features
  
imports: import numpy
  from ....None import opcodes
  from ....core import recursive_tile
  from ....serialization.serializables import KeyField, BoolField
  from ....tensor.core import TensorOrder
  from ....tensor.arithmetic import abs
  from ....tensor.spatial.distance import cdist
  from ....tensor.array_utils import as_same_device, device
  from ....utils import ensure_own_data
  from .core import PairwiseDistances
label_desc: Use image node_id 4 for calling the ManhattanDistances obj's underlying member method code with example usage: obj.sum_over_features() and returns: self