code: def event_shape(self) -> Tuple:
      return (self.dim,)
  
imports: from typing import Optional, Tuple, Type
  import numpy
  from gluonts.core.component import validated
  from gluonts.mx import Tensor
  from gluonts.mx.util import make_nd_diag
  from .distribution import Distribution, _sample_multiple, getF
  from .distribution_output import DistributionOutput
label_desc: Use image node_id 4 for calling the DirichletMultinomialOutput obj's underlying member method code with example usage: obj.event_shape() and returns: self