gufunc error with whitespace in dask

gufunc.py

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/var/folders/yt/z22_f0896l74f8gs3_20vc_00000gn/T/ipykernel_88946/1449311839.py in <module>
      7     return np.linalg.inv(x)
      8 
----> 9 y = gufoo(b)

~/mambaforge/envs/py/lib/python3.9/site-packages/dask/array/gufunc.py in __call__(self, *args, **kwargs)
    659 
    660     def __call__(self, *args, **kwargs):
--> 661         return apply_gufunc(
    662             self.pyfunc,
    663             self.signature,

~/mambaforge/envs/py/lib/python3.9/site-packages/dask/array/gufunc.py in apply_gufunc(func, signature, axes, axis, keepdims, output_dtypes, output_sizes, vectorize, allow_rechunk, meta, *args, **kwargs)
    356     if vectorize:
    357         otypes = [x.dtype for x in meta] if isinstance(meta, tuple) else [meta.dtype]
--> 358         func = np.vectorize(func, signature=signature, otypes=otypes)
    359 
    360     ## Miscellaneous

~/mambaforge/envs/py/lib/python3.9/site-packages/numpy/lib/function_base.py in __init__(self, pyfunc, otypes, doc, excluded, cache, signature)
   2129 
   2130         if signature is not None:
-> 2131             self._in_and_out_core_dims = _parse_gufunc_signature(signature)
   2132         else:
   2133             self._in_and_out_core_dims = None

~/mambaforge/envs/py/lib/python3.9/site-packages/numpy/lib/function_base.py in _parse_gufunc_signature(signature)
   1865     """
   1866     if not re.match(_SIGNATURE, signature):
-> 1867         raise ValueError(
   1868             'not a valid gufunc signature: {}'.format(signature))
   1869     return tuple([tuple(re.findall(_DIMENSION_NAME, arg))

ValueError: not a valid gufunc signature: (n, n)->(n, n)