code: def setUpClass(cls):  # pylint: disable=g-missing-super-call
      cls._gpu_available = test_util.is_gpu_available()
  
imports: import itertools
  import numpy
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops.linalg.sparse import sparse_csr_matrix_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the CSRSparseMatrixTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types