code: def backend(converter):
      ConverterRegistry.backends[converter.name] = converter
      if "alias_names" in converter.__dict__:
          for name in converter.alias_names:
              ConverterRegistry.backend_alias_names[
                  name
              ] = converter.name
      return converter
  
imports: import tempfile
  import warnings
  from typing import Optional, Text, Tuple
  from coremltools.converters._profile_utils import _profile
  from coremltools.converters.mil import Program
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil.types.symbolic import k_num_internal_syms, k_used_symbols
  from coremltools.models import MLModel
  from coremltools.models.model import _create_mlpackage
  from .None import ImageType, InputType
  from .mil.passes.pass_pipeline import PassPipeline, PassPipelineManager
label_desc: Use image node_id 2 for calling the ConverterRegistry obj's underlying member method code with example usage: obj.backend(converter) and returns: converter