code: def matplotlib_pyplot():
      import matplotlib  # pylint: disable=g-import-not-at-top
  
      matplotlib.use("agg")
      import matplotlib.pyplot as plt  # pylint: disable=g-import-not-at-top
  
      return plt
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import io
  import os
  import numpy
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.layers import common_layers
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import contrib
  from tensor2tensor.utils import metrics
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling a global function with example usage: matplotlib_pyplot() and returns: plt