code: def supports_multivariate(self) -> bool:
      return True
  
imports: from typing import Optional, Tuple
  import torch
  import torch.nn
  from darts.logging import raise_if
  from darts.models.forecasting.pl_forecasting_module import PLMixedCovariatesModule, io_processor
  from darts.models.forecasting.torch_forecasting_model import MixedCovariatesTorchModel
label_desc: Use image node_id 3 for calling the DLinearModel obj's underlying member method code with example usage: obj.supports_multivariate() and returns: True