Delete mq2007 dataset. (#28995)

* Fix en doc for rnn.py. test=document_fix

* Delete mq2007 dataset.

python/paddle/dataset/__init__.py

@@ -24,7 +24,6 @@ import paddle.dataset.conll05
 import paddle.dataset.uci_housing
 import paddle.dataset.wmt14
 import paddle.dataset.wmt16
-import paddle.dataset.mq2007
 import paddle.dataset.flowers
 import paddle.dataset.voc2012
 import paddle.dataset.image

python/paddle/dataset/tests/mq2007_test.py

@@ -1,35 +0,0 @@
-# Copyright (c) 2016 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
-# limitations under the License.
-
-from __future__ import print_function
-
-import paddle.dataset.mq2007
-import unittest
-
-
-class TestMQ2007(unittest.TestCase):
-    def test_pairwise(self):
-        for label, query_left, query_right in paddle.dataset.mq2007.test(
-                format="pairwise"):
-            self.assertEqual(query_left.shape(), (46, ))
-            self.assertEqual(query_right.shape(), (46, ))
-
-    def test_listwise(self):
-        for label_array, query_array in paddle.dataset.mq2007.test(
-                format="listwise"):
-            self.assertEqual(len(label_array), len(query_array))
-
-
-if __name__ == "__main__":
-    unittest.main()