code: def gru(n_input, hidden_size):
      return nn.GRU(
          n_input * hidden_size, hidden_size, batch_first=True
      )
  
imports: import math
  import librosa
  import numpy
  import torch
  import torch.fft
  import torch.nn
  from scipy.signal import get_window
label_desc: Use image node_id 11 for calling a global function with example usage: gru(n_input, hidden_size) and returns: nn