gistfile1.txt

```python
def f(x):
    return np.sum(x)
grad(f)(np.eye(3))
```

```python
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-a3386d50981f> in <module>()
      1 def f(x):
      2     return np.sum(x)
----> 3 grad(f)(np.eye(3))

/Users/alexbw/Code/autograd/autograd/convenience_wrappers.py in gradfun(*args, **kwargs)
     24         args[argnum] = safe_type(args[argnum])
     25         vjp, ans = make_vjp(scalar_fun, argnum)(*args, **kwargs)
---> 26         return vjp(cast_to_same_dtype(1.0, ans))
     27 
     28     return gradfun

/Users/alexbw/Code/autograd/autograd/core.py in <lambda>(g)
     16             warnings.warn("Output seems independent of input.")
     17             return lambda g : start_node.vspace.zeros(), end_node
---> 18         return lambda g : backward_pass(g, end_node, start_node), end_node
     19     return vjp
     20 

/Users/alexbw/Code/autograd/autograd/core.py in backward_pass(g, end_node, start_node)
     39         for argnum, parent in parents:
     40             outgrad = function.vjp(argnum, cur_outgrad, node,
---> 41                                    parent.vspace, node.vspace, args, kwargs)
     42             outgrads[parent].append(outgrad)
     43             assert_vspace_match(outgrad, parent.vspace, function)

/Users/alexbw/Code/autograd/autograd/core.py in vjp(self, argnum, outgrad, ans, vs, gvs, args, kwargs)
     76     def vjp(self, argnum, outgrad, ans, vs, gvs, args, kwargs):
     77         try:
---> 78             return self.vjps[argnum](outgrad, ans, vs, gvs, *args, **kwargs)
     79         except KeyError:
     80             if self.vjps == {}:

TypeError: grad_np_sum() got an unexpected keyword argument 'dtype'
```