class_docstr: Checking speed on a vanilla RNN.
code: def rnn_grad(self):
      self.grad_fn(
          (self.W1, self.b1, self.Wout, self.bout),
          self.x,
          self.l,
          self.n,
      )
  
file_path: autograd/benchmarks/bench_rnn.py
imports: from autograd import grad
  import autograd.numpy
label_desc: Use image node_id 2 for calling the RNNSuite obj's underlying member method code with example usage: obj.rnn_grad() without return types