class_docstr: Importer class to create the backend module.
class_docstr_tok: ["Importer","class","to","create","the","backend","module","."]
code: def _import_backend(backend_name):
      try:
          return importlib.import_module(
              f"geomstats._backend.{backend_name}"
          )
      except ModuleNotFoundError:
          raise RuntimeError(f"Unknown backend '{backend_name}'")
  
file_path: geomstats/geomstats/_backend/__init__.py
imports: import importlib
  import logging
  import os
  import sys
  import types
  import geomstats._backend._common
label_desc: Use image node_id 2 for calling the BackendImporter obj's underlying member method code with example usage: obj._import_backend(backend_name) and returns: importlib