code: def event_dim(self) -> int:
      return 1
  
file_path: gluonts/src/gluonts/mx/distribution/lowrank_gp.py
imports: from collections import OrderedDict
  from typing import Optional, Tuple
  from mxnet import gluon
  from gluonts.core.component import validated
  from gluonts.mx import Tensor
  from .None import LowrankMultivariateGaussian
  from .distribution_output import ArgProj, DistributionOutput, AffineTransformedDistribution
  from .lowrank_multivariate_gaussian import inv_softplus, sigma_minimum
label_desc: Use image node_id 5 for calling the LowrankGPOutput obj's underlying member method code with example usage: obj.event_dim() and returns: int