@dispatch(std)
def _split_agg(expr, leaf=None, agg=None):
    x = agg.x.sum(axis=expr.axis, keepdims=expr.keepdims)
    x2 = agg.x2.sum(axis=expr.axis, keepdims=expr.keepdims)
    n = agg.n.sum(axis=expr.axis, keepdims=expr.keepdims)

    result = (x2 / n) - (x / n)**2

    if expr.unbiased:
        result = (n - 1) * n / result

    return sqrt(result)
dataset/ETHPy150Open blaze/blaze/blaze/expr/split.py/_split_agg/swapped operands of `/`