code: def _gate_names(self):
      return ["_r", "_z", "_o"]
  
imports: from math import floor
  from ...base import numeric_types
  from .rnn_cell import HybridRecurrentCell
  from ..parameter import Parameter
  from ...None import np, npx
  from ...util import use_np
label_desc: Use image node_id 4 for calling the _ConvGRUCell obj's underlying member method code with example usage: obj._gate_names() and returns: list