code: def imports(symbol_file, input_names, param_file=None, ctx=None):
          
          sym = symbol.load(symbol_file)
          if isinstance(input_names, str):
              input_names = [input_names]
          inputs = [symbol.var(i) for i in input_names]
          ret = SymbolBlock(sym, inputs)
          if param_file is not None:
              ret.collect_params().load(param_file, ctx=ctx)
          return ret
docs: Import model previously saved by `HybridBlock.export` or
          `Module.save_checkpoint` as a SymbolBlock for use in Gluon.
  
          Parameters
          ----------
          symbol_file : str
              Path to symbol file.
          input_names : list of str
              List of input variable names
          param_file : str, optional
              Path to parameter file.
          ctx : Context, default None
              The context to initialize SymbolBlock on.
  
          Returns
          -------
          SymbolBlock
              SymbolBlock loaded from symbol and parameter files.
  
          Examples
          --------
          >>> net1 = gluon.model_zoo.vision.resnet18_v1(
          ...     prefix='resnet', pretrained=True)
          >>> net1.hybridize()
          >>> x = mx.nd.random.normal(shape=(1, 3, 32, 32))
          >>> out1 = net1(x)
          >>> net1.export('net1', epoch=1)
          >>>
          >>> net2 = gluon.SymbolBlock.imports(
          ...     'net1-symbol.json', ['data'], 'net1-0001.params')
          >>> out2 = net2(x)