title: Error when i load data from a text file in python
body: <p>I am totally new to Linux, python, and tensorflow.
  I am having a problem to get a data from a separate text file.
  Python codings are as below.</p>
  
  <pre><code>import tensorflow as tf
  import numpy as np
  
  xy=np.loadtxt('train.txt',unpack=True, dtype='float32')
  
  x_data=xy[0:-1]
  y_data=xy[-1];
  
  print 'x',x_data
  print 'y',y_data
  </code></pre>
  
  <p>and error messages are as below.</p>
  
  <pre><code>root@bu-R470-R420:/home/bu# source ~/tensorflow/bin/activate
  tensorflow)root@bu-R470-R420:/home/bu# python -m tensorflow.linearLoad
  Traceback (most recent call last):
   File "/usr/lib/python2.7/runpy.py", line 162, 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 "/root/tensorflow/lib/python2.7/site-packages/tensorflow/linearLoad.py", line 5, in &lt;module&gt;
      xy=np.loadtxt('train.txt',unpack=True, dtype='float32')
    File "/root/tensorflow/local/lib/python2.7/site-packages/numpy/lib/npyio.py", line 803, in loadtxt
      fh = iter(open(fname, 'U'))
  IOError: [Errno 2] No such file or directory: 'train.txt'
  (tensorflow)root@bu-R470-R420:/home/bu# 
  </code></pre>
  
  <p>Since i have been using Windows OS, Coding in  Linux is a quite nightmare.
  Please help me out.</p>