def norm_zero_one(array, dim=None):
    """
    normalizes a numpy array from 0 to 1 based in its extent

    Args:
        array (ndarray):
        dim   (int):

    Returns:
        ndarray:

    CommandLine:
        python -m utool.util_alg --test-norm_zero_one

    Example:
        >>> # ENABLE_DOCTEST
        >>> from utool.util_alg import *  # NOQA
        >>> import utool as ut
        >>> array = np.array([ 22, 1, 3, 2, 10, 42, ])
        >>> dim = None
        >>> array_norm = norm_zero_one(array, dim)
        >>> result = ut.repr2(list(array_norm), precision=3)
        >>> print(result)
        [0.512, 0.000, 0.049, 0.024, 0.220, 1.000]
    """
    if not util_type.is_float(array):
        array = array.astype(np.float32)
    array_max  = array.max(dim)
    array_min  = array.min(dim)
    array_exnt = np.subtract(array_max, array_min)
    array_norm = np.divide(np.subtract(array, array_min), array_exnt)
    return array_norm