add data_generator ut

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

+#   Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+import paddle
+import unittest
+import paddle.distributed.fleet as fleet
+
+
+class MyMultiSlotDataGenerator(fleet.MultiSlotDataGenerator):
+    def generate_sample(self, line):
+        def data_iter():
+            for i in range(100):
+                yield ("words", [1, 2, 3, 4]), ("label", [0])
+
+        return data_iter
+
+
+class MyMultiSlotStringDataGenerator(fleet.MultiSlotStringDataGenerator):
+    def generate_sample(self, line):
+        def data_iter():
+            for i in range(100):
+                yield ("words", ["1", "2", "3", "4"]), ("label", ["0"])
+
+        return data_iter
+
+
+class TestMultiSlotDataGenerator(unittest.TestCase):
+    def test_MultiSlotDataGenerator_basic(self):
+        my_ms_dg = MyMultiSlotDataGenerator()
+        my_ms_dg.run_from_memory()
+
+
+class TestMultiSlotStringDataGenerator(unittest.TestCase):
+    def test_MyMultiSlotStringDataGenerator_basic(self):
+        my_mss_dg = MyMultiSlotStringDataGenerator()
+        my_mss_dg.run_from_memory()
+
+
+if __name__ == '__main__':
+    unittest.main()