human
Solve the following python programming problem given the following code:
def expect_dimensions(**dimensions) : 
    "
    Preprocessing decorator that verifies inputs are numpy arrays with a
    specific dimensionality.

    Usage
    -----
    >>> from numpy import array
    >>> @expect_dimensions(x=1, y=2)
    ... def foo(x, y):
    ...    return x[0] + y[0, 0]
    ...
    >>> foo(array([1, 1]), array([[1, 1], [2, 2]]))
    2
    >>> foo(array([1, 1], array([1, 1])))
    Traceback (most recent call last):
       ...
    TypeError: foo() expected a 2-D array for argument 'y', but got a 1-D array instead.  # noqa
    " 
    def _expect_dimension(expected_ndim) : 
        def _check(func, argname, argvalue) : 
            funcname = _qualified_name (func) 
            actual_ndim = argvalue.ndim 
            if (actual_ndim != expected_ndim) : 
                if (actual_ndim == 0) : 
                    actual_repr = 'scalar' 
else : 
                    actual_repr = ('%d-D array' % actual_ndim) 
raise ValueError ('{func}() expected a {expected:d}-D array for argument {argname!r}, but got a {actual} instead.'.format (func = funcname, expected = expected_ndim, argname = argname, actual = actual_repr)) 
return argvalue 
return _check 
return preprocess (** valmap (<MASK>, dimensions)) 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def _expect_dimension(