code: def event_shape(self) -> Tuple:
      return ()
  
file_path: gluonts/src/gluonts/torch/distributions/negative_binomial.py
imports: from typing import Dict, Optional, Tuple, Union
  import torch
  import torch.nn.functional
  from torch.distributions import Distribution
  from torch.distributions import NegativeBinomial
  from gluonts.util import lazy_property
  from scipy.stats import nbinom
  from .distribution_output import DistributionOutput
label_desc: Use image node_id 4 for calling the NegativeBinomialOutput obj's underlying member method code with example usage: obj.event_shape() and returns: 