code: def generate_upper_triangle(dataframe):
      lower_triangle = dataframe["src"] >= dataframe["dst"]
      dataframe[["src", "dst"]][lower_triangle] = dataframe[
          ["dst", "src"]
      ][lower_triangle]
      return dataframe
  
imports: import gc
  import pytest
  import random
  import networkx
  import numpy
  import cupy
  import cudf
  import cugraph
  from cugraph.datasets import karate_disjoint
  from cugraph.testing import utils, SMALL_DATASETS
label_desc: Use image node_id 10 for calling a global function with example usage: generate_upper_triangle(dataframe) and returns: dataframe