code: def g(self, x: np.ndarray) -> np.ndarray:
      return np.tanh(x)
  
file_path: onnx/onnx/backend/test/case/node/gru.py
imports: from typing import Any, Tuple
  import numpy
  import onnx
  from onnx.backend.test.case.base import Base
  from onnx.backend.test.case.node import expect
label_desc: Use image node_id 3 for calling the GRUHelper obj's underlying member method code with example usage: obj.g(x) and returns: np