code: def testMnistTrain(self, strategy):
      accuracy = mnist_train.main(strategy)
      self.assertGreater(accuracy, 0.7, "accuracy sanity check")
  
file_path: tensorflow-upstream/tensorflow/compiler/mlir/tfr/examples/mnist/mnist_train_test.py
imports: from absl.testing import parameterized
  from tensorflow.compiler.mlir.tfr.examples.mnist import mnist_train
  from tensorflow.python.distribute import combinations
  from tensorflow.python.distribute import strategy_combinations
  from tensorflow.python.distribute import test_util
  from tensorflow.python.framework import test_util
label_desc: Use image node_id 1 for calling the MnistTrainTest obj's underlying member method code with example usage: obj.testMnistTrain(strategy) without return types