fix understand_sentiment_lstm.py

[chengduoZH]

• When the last batch of dataset is less than batch_size, the "understand_sentiment_lstm.py" run will go wrong.

Traceback (most recent call last):
  File "/usr/lib/python2.7/pdb.py", line 1314, in main
    pdb._runscript(mainpyfile)
  File "/usr/lib/python2.7/pdb.py", line 1233, in _runscript
    self.run(statement)
  File "/usr/lib/python2.7/bdb.py", line 400, in run
    exec cmd in globals, locals
  File "<string>", line 1, in <module>
  File "understand_sentiment_lstm.py", line 1, in <module>
    from __future__ import absolute_import
  File "understand_sentiment_lstm.py", line 163, in run_benchmark
    fetch_list=[avg_cost] + accuracy.metrics)
  File "/paddle/Paddle_release/Paddle/python/paddle/v2/fluid/executor.py", line 144, in run
    self.executor.run(program.desc, scope, 0, True)
EnforceNotMet: enforce capacity == in_size failed, 81920 != 20480
The size of Input(X) mismatches with Attr(shape). at [/paddle/Paddle_release/Paddle/paddle/operators/reshape_op.cc:51]
PaddlePaddle Call Stacks:
0       0x7f38a3bd9777p paddle::platform::EnforceNotMet::EnforceNotMet(std::__exception_ptr::exception_ptr, char const*, int) + 727
1       0x7f38a3e4500fp paddle::operators::ReshapeOp::InferShape(paddle::framework::InferShapeContext*) const + 2239
2       0x7f38a43e7d2dp paddle::framework::OperatorWithKernel::Run(paddle::framework::Scope const&, paddle::platform::DeviceContext const&) const + 573
3       0x7f38a3c83b45p paddle::framework::Executor::Run(paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool) + 613
4       0x7f38a3beff8ap void pybind11::cpp_function::initialize<pybind11::cpp_function::initialize<void, paddle::framework::Executor, paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool, pybind11::name, pybind11::is_method, pybind11::sibling>(void (paddle::framework::Executor::*)(paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool), pybind11::name const&, pybind11::is_method const&, pybind11::sibling const&)::{lambda(paddle::framework::Executor*, paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool)#1}, void, paddle::framework::Executor*, paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool, pybind11::name, pybind11::is_method, pybind11::sibling>(pybind11::cpp_function::initialize<void, paddle::framework::Executor, paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool, pybind11::name, pybind11::is_method, pybind11::sibling>(void (paddle::framework::Executor::*)(paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool), pybind11::name const&, pybind11::is_method const&, pybind11::sibling const&)::{lambda(paddle::framework::Executor*, paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool)#1}&&, void (*)(paddle::framework::Executor*, paddle::framework::ProgramDescBind const&, paddle::framework::Scope*, int, bool), pybind11::name const&, pybind11::is_method const&, pybind11::sibling const&)::{lambda(pybind11::detail::function_call&)#3}::_FUN(pybind11::detail::function_call) + 490
5       0x7f38a3bedcf4p pybind11::cpp_function::dispatcher(_object*, _object*, _object*) + 1236

• In this PR, when the size of the last batch is less than batch_size, the program ignores this batch.

if len(data) < args.batch_size : continue

• When the last batch of dataset is less than batch_size, the "understand_sentiment_dynamic_lstm.py" run will go wrong.

Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/lib/python2.7/dist-packages/yep.py", line 174, in <module>
    main()
  File "/usr/local/lib/python2.7/dist-packages/yep.py", line 148, in main
    __main__.__dict__)
  File "/paddle/benchmark_profiling/understand_sentiment_dynamic_lstm.py", line 158, in <module>
    run_benchmark(dynamic_lstm_model, args)
  File "/paddle/benchmark_profiling/understand_sentiment_dynamic_lstm.py", line 131, in run_benchmark
    label = label.reshape([args.batch_size, 1])
ValueError: cannot reshape array of size 8 into shape (32,1)

• In this PR, when the size of the last batch is less than batch_size, the program resize label to [len(data), 1].

label = label.reshape([len(data), 1])

[qingqing01]

File "/paddle/Paddle_release/Paddle/python/paddle/v2/fluid/executor.py", line 144, in run
self.executor.run(program.desc, scope, 0, True)
EnforceNotMet: enforce capacity == in_size failed, 81920 != 20480

Maybe this is a bug of operator. I do not think it needs to skip here.

[chengduoZH]

I have notified the relevant person. PaddlePaddle/Paddle#6533

[chengduoZH]

当前运行understand_sentiment_lstm.py时，如果数据集最后一个batch的样本个数少于指定的BATCH_SIZE，程序仍然会在reshape_op里面挂掉。后续会把reshape_op中shape属性作为输入，修改之后就不会存在这样的问题。