code: def event_shape(self) -> Tuple:
      return (self.dim,)
  
imports: import math
  from typing import Optional, Tuple
  import numpy
  from mxnet import gluon
  from gluonts.core.component import validated
  from gluonts.mx import Tensor
  from .distribution import Distribution, _sample_multiple, getF
  from .distribution_output import ArgProj, DistributionOutput, AffineTransformedDistribution
label_desc: Use image node_id 5 for calling the LowrankMultivariateGaussianOutput obj's underlying member method code with example usage: obj.event_shape() and returns: self