code: def event_shape(self) -> Tuple:
      return ()
  
imports: from typing import Dict, List, Optional, Tuple, cast
  import torch
  import torch.nn.functional
  from torch.distributions import AffineTransform, TransformedDistribution
  from gluonts.core.component import validated
  from .distribution_output import DistributionOutput
label_desc: Use image node_id 4 for calling the PiecewiseLinearOutput obj's underlying member method code with example usage: obj.event_shape() and returns: 