Merge pull request #2 from mapingshuo/sequence_pad

add sequence_pad example

Author: guru4elephant

api_examples/paddle/fluid/layers/sequence_pad.py

@@ -0,0 +1,60 @@
+# Copyright (c) 2019 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.
+
+# api: paddle.fluid.layers.sequence_pad
+# env: local
+# device: cpu
+# text: sequence-pad
+
+import paddle.fluid as fluid
+import numpy
+ 
+x = fluid.layers.data(name="question", shape=[1], dtype="int64", lod_level=1)
+ 
+# define net here
+embed = fluid.layers.embedding(input=x, size=[32, 2],
+                               param_attr=fluid.ParamAttr(name='emb.w'))
+ 
+pad_value = fluid.layers.assign(input=numpy.array([0], dtype=numpy.float32))
+z, mask = fluid.layers.sequence_pad(x=embed, pad_value=pad_value)
+ 
+place = fluid.CPUPlace()
+exe = fluid.Executor(place)
+feeder = fluid.DataFeeder(feed_list=[x], place=place)
+exe.run(fluid.default_startup_program())
+ 
+# prepare a batch of data
+data = [([0, 1, 2, 3, 3],), ([0, 1, 2],)]
+ 
+mask_out, z_out = exe.run(fluid.default_main_program(),
+                feed=feeder.feed(data),
+                fetch_list=[mask, z],
+                return_numpy=True)
+ 
+print(mask_out)
+print(z_out)
+
+#[[5]
+# [3]]
+#[[[ 0.03990805 -0.10303718]
+#  [ 0.08801201 -0.30412018]
+#  [ 0.0706093  -0.18075395]
+#  [-0.0283702   0.01683199]
+#  [-0.0283702   0.01683199]]
+ 
+# [[ 0.03990805 -0.10303718]
+#  [ 0.08801201 -0.30412018]
+#  [ 0.0706093  -0.18075395]
+#  [ 0.          0.        ]
+#  [ 0.          0.        ]]]