title: import xgboost in python causes error
body: <p>I successfully installed xgboost but when I import it I get the problem as given below. I can't figure out the problem.</p>
  
  <pre><code>    &gt;&gt; import xgboost as xgb
      Traceback (most recent call last):
      File "&lt;stdin&gt;", line 1, in &lt;module&gt;
      File "/home/deploy/anaconda3/lib/python3.5/site-packages/xgboost/__init__.py", line 11, in &lt;module&gt; from 
      .core import DMatrix, Booster
      File "/home/deploy/anaconda3/lib/python3.5/site-packages/xgboost/core.py", line 112, in &lt;module&gt;
      _LIB = _load_lib()
      File "/home/deploy/anaconda3/lib/python3.5/site-packages/xgboost/core.py", line 106, in _load_lib
      lib = ctypes.cdll.LoadLibrary(lib_path[0])
      File "/home/deploy/anaconda3/lib/python3.5/ctypes/__init__.py", line 425, in LoadLibrary
      return self._dlltype(name)
      File "/home/deploy/anaconda3/lib/python3.5/ctypes/__init__.py", line 347, in __init__
      self._handle = _dlopen(self._name, mode)
      OSError: /home/deploy/anaconda3/lib/python3.5/site-packages/xgboost/./lib/libxgboost.so: invalid ELF header
  </code></pre>