cupy: ModuleNotFoundError with cupy 7.1.0 installed from conda-forge

After installing cupy 7.1.0 from conda-forge, I get the following error, which is mitigated by downgrading to 7.0.0:

In [1]: import cupy as cp                                                                                                                                                                     

In [2]: a = cp.asarray([1, 2, 3])                                                                                                                                                             

In [3]: a.max()                                                                                                                                                                               
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-3-f432eed13108> in <module>
----> 1 a.max()

cupy/core/core.pyx in cupy.core.core.ndarray.max()

cupy/core/core.pyx in cupy.core.core.ndarray.max()

cupy/core/_routines_statistics.pyx in cupy.core._routines_statistics._ndarray_max()

cupy/cuda/cub.pyx in cupy.cuda.cub.cub_reduction()

ModuleNotFoundError: No module named 'cupy.core._reduction'

Thanks!