title: import nltk does not work
body: <p>So I just downloaded <code>nltk</code> module from the website and installed it. But when I run <code>import nltk</code> on the python console, I am getting this error. Can anybody help me? I've searched online for this error but to no avail.</p>
  
  <pre><code>&gt;&gt;&gt; import nltk
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/local/lib/python2.7/dist-packages/nltk/__init__.py", line 128, in &lt;module&gt;
      from nltk.chunk import *
    File "/usr/local/lib/python2.7/dist-packages/nltk/chunk/__init__.py", line 157, in &lt;module&gt;
      from nltk.chunk.api import ChunkParserI
    File "/usr/local/lib/python2.7/dist-packages/nltk/chunk/api.py", line 13, in &lt;module&gt;
      from nltk.parse import ParserI
    File "/usr/local/lib/python2.7/dist-packages/nltk/parse/__init__.py", line 79, in &lt;module&gt;
      from nltk.parse.transitionparser import TransitionParser
    File "/usr/local/lib/python2.7/dist-packages/nltk/parse/transitionparser.py", line 21, in &lt;module&gt;
      from sklearn.datasets import load_svmlight_file
    File "/home/jaydeep/.local/lib/python2.7/site-packages/sklearn/__init__.py", line 57, in &lt;module&gt;
      from .base import clone
    File "/home/jaydeep/.local/lib/python2.7/site-packages/sklearn/base.py", line 11, in &lt;module&gt;
      from .utils.fixes import signature
    File "/home/jaydeep/.local/lib/python2.7/site-packages/sklearn/utils/__init__.py", line 10, in &lt;module&gt;
      from .murmurhash import murmurhash3_32
    File "numpy.pxd", line 155, in init sklearn.utils.murmurhash (sklearn/utils/murmurhash.c:5029)
  **ValueError: numpy.dtype has the wrong size, try recompiling**
  </code></pre>
  
  <p>I have tried reinstalling both <code>numpy</code> and <code>nltk</code> but I still get the same error</p>