Created by: SniperZhao

新建了一个python文件，照抄了新手入门的线性回归代码。 运行该python的时候得到错误：

I0622 17:05:55.289027  8472 Util.cpp:166] commandline:  --use_gpu=False 
I0622 17:05:55.294421  8472 GradientMachine.cpp:85] Initing parameters..
I0622 17:05:55.294454  8472 GradientMachine.cpp:92] Init parameters done.
Traceback (most recent call last):
  File "lienerRegression.py", line 61, in <module>
    num_passes=100)
  File "/home/zhaoyuan/002.tools/paddleV2/python27/lib/python2.7/site-packages/paddle/v2/trainer.py", line 153, in train
    in_args = feeder(data_batch)
  File "/home/zhaoyuan/002.tools/paddleV2/python27/lib/python2.7/site-packages/py_paddle/dataprovider_converter.py", line 278, in __call__
    return self.convert(dat, argument)
  File "/home/zhaoyuan/002.tools/paddleV2/python27/lib/python2.7/site-packages/paddle/v2/data_feeder.py", line 134, in convert
    return DataProviderConverter.convert(self, reorder_data(dat), argument)
  File "/home/zhaoyuan/002.tools/paddleV2/python27/lib/python2.7/site-packages/py_paddle/dataprovider_converter.py", line 263, in convert
    scanner.pre_scan(each_step)
  File "/home/zhaoyuan/002.tools/paddleV2/python27/lib/python2.7/site-packages/py_paddle/dataprovider_converter.py", line 112, in pre_scan
    self.__dim__ = reduce(lambda x, y: x * y, self.__shape__)
TypeError: reduce() of empty sequence with no initial value