class_docstr: Extend Glow for video.
docstr: Get a conditional prior distribution on the top latent.
code: def cond_top_dist(self, cond_latents):
      """Get a conditional prior distribution on the top latent."""
      prior_dist = self.top_cond_prior("conditional", cond_latents)
      return prior_dist.loc, prior_dist.scale
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import numpy
  from six.moves import range
  from tensor2tensor.layers import common_layers
  from tensor2tensor.layers import common_video
  from tensor2tensor.layers import modalities
  from tensor2tensor.models.research import glow
  from tensor2tensor.models.research import glow_ops
  from tensor2tensor.utils import contrib
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
  import tensorflow_probability
label_desc: Use image node_id 8 for calling the NextFrameGlow obj's underlying member method code with example usage: obj.cond_top_dist(cond_latents) and returns: prior_dist,  prior_dist