class_docstr: Concat CombinerFunction.
class_docstr_tok: ["Concat","CombinerFunction","."]
code: def combined_output_dim(self, output_dims):
      concat_tensor_dim = 0
      for output_dim in output_dims:
          concat_tensor_dim += output_dim
  
      return concat_tensor_dim
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import abc
  import six
  from tensor2tensor.layers import common_attention
  from tensor2tensor.layers import common_layers
  from tensor2tensor.models import transformer
  from tensor2tensor.models.neural_architecture_search import nas_layers
  from tensor2tensor.utils import contrib
  from tensor2tensor.utils import metrics
  from tensor2tensor.utils import registry
  from tensor2tensor.utils import t2t_model
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 2 for calling the ConcatCombiner obj's underlying member method code with example usage: obj.combined_output_dim(output_dims) and returns: concat_tensor_dim