In [30]: da.from_array(np.random.randn(2, 3), chunks=(2, 3)).argmin().compute()
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-30-43e4bf57492f> in <module>()
----> 1 da.from_array(np.random.randn(2, 3), chunks=(2, 3)).argmin().compute()

/Users/shoyer/conda/envs/xarray-dev/lib/python3.5/site-packages/dask/array/core.py in argmin(self, axis, split_every)
   1146     def argmin(self, axis=None, split_every=None):
   1147         from .reductions import argmin
-> 1148         return argmin(self, axis=axis, split_every=split_every)
   1149
   1150     @wraps(np.argmax)

/Users/shoyer/conda/envs/xarray-dev/lib/python3.5/site-packages/dask/array/reductions.py in _(a, axis, split_every)
    457     @wraps(argfunc)
    458     def _(a, axis=None, split_every=None):
--> 459         if axis < 0:
    460             axis = a.ndim + axis
    461         return reduction(a, chunk, agg, axis=axis, dtype='i8',