code: def __init__(self, **kwargs):
      super(transform_concat, self).__init__(**kwargs)
      self.axis_var = self.op.inputs["axis"]
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from coremltools.converters.mil.mil.passes.pass_registry import register_pass
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil.var import Var
  import logging
  import numpy
  import copy
  from collections import defaultdict
label_desc: Use image node_id 1 to create a new transform_concat object from inherited base classes: transform_axis_update_ops with example: obj = transform_concat()