I have the following test failures: you should use `assert_array_almost_equal` instead:

```
======================================================================
FAIL: Check fast dot blas wrapper function
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/Users/ogrisel/code/scikit-learn/sklearn/utils/tests/test_extmath.py", line 295, in test_fast_dot
    assert_array_equal(C, C_)
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/testing/utils.py", line 719, in assert_array_equal
    verbose=verbose, header='Arrays are not equal')
  File "/usr/local/Cellar/python/2.7.5/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/testing/utils.py", line 645, in assert_array_compare
    raise AssertionError(msg)
AssertionError:
Arrays are not equal

(mismatch 50.0%)
 x: array([[ 2.51309336,  3.09625551],
       [ 3.20171644,  3.40308068]])
 y: array([[ 2.51309336,  3.09625551],
       [ 3.20171644,  3.40308068]])
```