class_docstr: TODO: this is pytorch cell
  
  An operation reference to a subgraph.
  
  Example code:
  ```
      def __init__(...):
          ...
          self.cell = CustomCell(...)
          self.relu = K.layers.ReLU()
          ...
  
      def forward(...):
          ...
          x = self.cell(x)
          ...
  ```
  
  In above example, node `self.cell`'s operation is `Cell(cell_name='CustomCell')`.
  For comparison, `self.relu`'s operation is `Operation(type='ReLU')`.
  
  TODO: parameters of subgraph (see `Node` class)
  
  Attributes
  ----------
  type
      Always "_cell".
  parameters
      A dict with only one item; the key is "cell" and the value is cell's name.
  framework
      No real usage. Exists for compatibility with base class.
class_docstr_tok: ["TODO",":","this","is","pytorch","cell","An","operation","reference","to","a","subgraph",".","Example","code",":","``","`","def","__init__","(","...",")",":","...","self.cell","=","CustomCell","(","...",")","self.relu","=","K.layers.ReLU","(",")","...","def","forward","(","...",")",":","...","x","=","self.cell","(","x",")","...","``","`","In","above","example",",","node","`","self.cell","`","'s","operation","is","`","Cell","(","cell_name='CustomCell","'",")","`",".","For","comparison",",","`","self.relu","`","'s","operation","is","`","Operation","(","type='ReLU","'",")","`",".","TODO",":","parameters","of","subgraph","(","see","`","Node","`","class",")","Attributes","--","--","--","--","--","type","Always","``","_cell","''",".","parameters","A","dict","with","only","one","item",";","the","key","is","``","cell","''","and","the","value","is","cell","'s","name",".","framework","No","real","usage",".","Exists","for","compatibility","with","base","class","."]
code: def _to_class_name(self):
      # TODO: ugly, think about how to refactor this part
      return _convert_name(self.cell_name)
  
imports: from typing import Any, Dict, List, Optional, cast
  from nni.common.framework import get_default_framework
label_desc: Use image node_id 2 for calling the Cell obj's underlying member method code with example usage: obj._to_class_name() and returns: _convert_name