code: def init_hidden(self, device, batch_size=1):
      return torch.zeros(1, batch_size, self.hidden_size, device=device)
  
file_path: lightwood/lightwood/encoder/time_series/helpers/rnn_helpers.py
imports: import torch
  import torch.nn
  import numpy
  from lightwood.helpers.torch import LightwoodAutocast
label_desc: Use image node_id 3 for calling the DecoderRNNNumerical obj's underlying member method code with example usage: obj.init_hidden(device, batch_size) and returns: torch