code: def setUpClass(cls):
      super(CSRSparseMatrixGradTest, cls).setUpClass()
      cls._gpu_available = test_util.is_gpu_available()
  
file_path: tensorflow/tensorflow/python/kernel_tests/linalg/sparse/csr_sparse_matrix_sparse_mat_mul_grad_test.py
imports: import itertools
  import numpy
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradient_checker
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops.linalg.sparse import sparse_csr_matrix_grad
  from tensorflow.python.ops.linalg.sparse import sparse_csr_matrix_ops
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 1 for calling the CSRSparseMatrixGradTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types