code: def __len__(self):
      return 0
  
imports: import math
  import numpy
  from numpy.core.numerictypes import find_common_type
  from numpy.core.numeric import ScalarType
  from numpy.lib.index_tricks import ndindex
  from ..None import datasource
  from ..core import Tensor
  from ..base import ndim
  from ..merge import concatenate
label_desc: Use image node_id 3 for calling the AxisConcatenator obj's underlying member method code with example usage: obj.__len__() and returns: int