refactor: simplify unittest function

Author: chenwhql

python/paddle/fluid/tests/unittests/test_memory_usage.py

@@ -19,7 +19,7 @@
 import unittest
 
 
-def train_simulator(use_cuda, test_batch_size=10):
+def train_simulator(test_batch_size=10):
     if test_batch_size <= 0:
         raise ValueError("batch_size should be a positive integeral value, "
                          "but got batch_size={}".format(test_batch_size))
@@ -34,14 +34,7 @@ def train_simulator(use_cuda, test_batch_size=10):
     sgd_optimizer = fluid.optimizer.SGD(learning_rate=0.001)
     sgd_optimizer.minimize(avg_cost)
 
-    train_reader = paddle.batch(
-        paddle.reader.shuffle(
-            paddle.dataset.uci_housing.train(), buf_size=500),
-        batch_size=test_batch_size)
-
-    place = fluid.CUDAPlace(0) if use_cuda else fluid.CPUPlace()
-    exe = fluid.Executor(place)
-
+    # Calculate memory usage in current network config 
     lower_usage, upper_usage, unit = fluid.contrib.memory_usage(
         fluid.default_main_program(), batch_size=test_batch_size)
 
@@ -50,21 +43,17 @@ def train_simulator(use_cuda, test_batch_size=10):
 
 
 class TestMemoryUsage(unittest.TestCase):
-    def test_cpu(self):
-        with self.program_scope_guard():
-            train_simulator(use_cuda=False)
-
-    def test_cpu_with_unit_KB(self):
+    def test_with_unit_B(self):
         with self.program_scope_guard():
-            train_simulator(use_cuda=False, test_batch_size=1000)
+            train_simulator()
 
-    def test_cpu_with_unit_MB(self):
+    def test_with_unit_KB(self):
         with self.program_scope_guard():
-            train_simulator(use_cuda=False, test_batch_size=100000)
+            train_simulator(test_batch_size=1000)
 
-    def test_cuda(self):
+    def test_with_unit_MB(self):
         with self.program_scope_guard():
-            train_simulator(use_cuda=True)
+            train_simulator(test_batch_size=100000)
 
     @contextlib.contextmanager
     def program_scope_guard(self):