Fix lint issues (#6204)

official/resnet/estimator_cifar_benchmark.py

@@ -106,6 +106,7 @@ class EstimatorCifar10BenchmarkTests(tf.test.Benchmark):
     self._run_and_report_benchmark()
 
   def _run_and_report_benchmark(self):
+    """Executes benchmark and reports result."""
     start_time_sec = time.time()
     stats = cifar_main.run_cifar(flags.FLAGS)
     wall_time_sec = time.time() - start_time_sec

official/resnet/keras/keras_imagenet_benchmark.py

@@ -67,6 +67,7 @@ class Resnet50KerasAccuracy(keras_benchmark.KerasBenchmark):
     self._run_and_report_benchmark()
 
   def benchmark_8_gpu_bfc_allocator(self):
+    """Restricts CPU memory allocation."""
     self._setup()
     FLAGS.num_gpus = 8
     FLAGS.enable_eager = True