code: def expand_f0(f0_frame, hop_length, method="interpolation"):
      """Expand f0 to output wave length.
  
      Args:
          f0_frame (Tensor): Input tensor (B, 1, frame_len).
          hop_length (Tensor): Hop length.
          method (str): Method to expand f0. Choose either 'interpolation' or 'repeat'.
  
      Returns:
          Tensor: Output tensor (B, 1, wav_len).
  
      """
      frame_length = f0_frame.size(2)
      signal_length = frame_length * hop_length
      if method == "interpolation":
          f0_sample = F.interpolate(
              f0_frame,
              size=signal_length,
              mode="linear",
              align_corners=False,
          )
      elif method == "repeat":
          f0_sample = f0_frame.repeat_interleave(hop_length, dim=2)[
              :signal_length
          ]
      else:
          raise ValueError(
              "Invalid method. Choose either 'interpolation' or 'repeat'."
          )
      f0_sample = f0_sample.squeeze()[
          :signal_length
      ]  # Remove extra dimensions and trim to signal_length
      return f0_sample
  
label_desc: Use image node_id 1 for calling a global function with example usage: expand_f0(f0_frame, hop_length, method) and returns: f0_sample