In my numpy, `linspace` doesn't accept a `dtype` option!?
```
In [7]: np.linspace(1, 10, dtype=float)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-7-8979a0b673b3> in <module>()
----> 1 np.linspace(1, 10, dtype=float)

TypeError: linspace() got an unexpected keyword argument 'dtype'

In [8]: np.__version__
Out[8]: '1.8.1'
```