将所有输入的PObject合并成一个PObject(tuple)。 除返回值类型及输入类型都全是PObject外, 结果与 :func:`bigflow.transforms.cartesian(self, *pvalues, **options) ` 相同。 Args: *pobjects (PObject) 待操作PObjects。所有输入都必须是PObject. Returns: PObj
(*pobjects, **options)
source not stored for this graph (policy: none)
no outgoing calls