class_docstr: Identify a reflection padding layer composed out of `slices` and `concats`.
  
  .. code-block::
  
      Input graph:
  
              ------------------------------------------------------------------------------------- |
              |                                                                                     v
      input(1, 2, 6, 8) ------> slice_by_index(begin=[0, 0, 0, 1], end=[0, 0, 0, 2]) -----> concat(axis=3) ---> out(1, 2, 6, 10)
              |                                                                                     ^
              ----------------> slice_by_index(begin=[0, 0, 0, -2], end=[0, 0, 0, -1]) -------------|
  
  
      Output graph:
  
      input(1, 2, 6, 8) -----0> pad(mode=reflect, size=[0, 0, 1, 1]) -----> out(1, 2, 6, 10)
class_docstr_tok: ["Identify","a","reflection","padding","layer","composed","out","of","`","slices","`","and","`","concats","`",".","..","code-block",":",":","Input","graph",":","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","--","-","|","|","v","input","(","1",",","2",",","6",",","8",")","--","--","--",">","slice_by_index","(","begin=","[","0",",","0",",","0",",","1","]",",","end=","[","0",",","0",",","0",",","2","]",")","--","--","-",">","concat","(","axis=3",")","--","-",">","out","(","1",",","2",",","6",",","10",")","|","^","--","--","--","--","--","--","--","--",">","slice_by_index","(","begin=","[","0",",","0",",","0",",","-2","]",",","end=","[","0",",","0",",","0",",","-1","]",")","--","--","--","--","--","--","-|","Output","graph",":","input","(","1",",","2",",","6",",","8",")","--","--","-0",">","pad","(","mode=reflect",",","size=","[","0",",","0",",","1",",","1","]",")","--","--","-",">","out","(","1",",","2",",","6",",","10",")"]
code: def _reflection_padding_block(self, block):
      for op in list(block.operations):
          self._match_pattern(op, block)
  
imports: import numpy
  from coremltools.converters.mil._deployment_compatibility import AvailableTarget
  from coremltools.converters.mil.frontend._utils import value_at
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil.block import is_current_opset_version_compatible_with
  from coremltools.converters.mil.mil.passes.graph_pass import AbstractGraphPass
  from coremltools.converters.mil.mil.passes.helper import _check_child_op_type, _check_var_scalar_value, block_context_manager
  from coremltools.converters.mil.mil.passes.pass_registry import register_pass
  from coremltools.converters.mil.mil.types.symbolic import any_symbolic
label_desc: Use image node_id 4 for calling the use_reflection_padding obj's underlying member method code with example usage: obj._reflection_padding_block(block) without return types