add API paddle.linalg.lu/lu_unpack

[zhiboniu]

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add API paddle.linalg.lu

拆成三个小的子pr合入：
lu_op正向：
#38559

lu_op反向：
#38616

lu API/lu_unpack op/API:
#38617

        import paddle 

        x = paddle.to_tensor([[1.0, 2.0], [3.0, 4.0], [5.0, 6.0]]).astype('float64')
        lu,p,info = paddle.linalg.lu(x, get_infos=True)

        '''
        >>> lu:
        Tensor(shape=[3, 2], dtype=float64, place=CUDAPlace(0), stop_gradient=True,
            [[5.        , 6.        ],
                [0.20000000, 0.80000000],
                [0.60000000, 0.50000000]])
        >>> p
        Tensor(shape=[2], dtype=int32, place=CUDAPlace(0), stop_gradient=True,
            [3, 3])
        >>> info
        Tensor(shape=[], dtype=int32, place=CUDAPlace(0), stop_gradient=True,
            0)
        '''

        P,L,U = paddle.linalg.lu_unpack(lu,p)

        '''
        >>> P
        (Tensor(shape=[3, 3], dtype=float64, place=CUDAPlace(0), stop_gradient=True,
        [[0., 1., 0.],
        [0., 0., 1.],
        [1., 0., 0.]]), 
        >>> L
        Tensor(shape=[3, 2], dtype=float64, place=CUDAPlace(0), stop_gradient=True,
        [[1.        , 0.        ],
        [0.20000000, 1.        ],
        [0.60000000, 0.50000000]]), 
        >>> U
        Tensor(shape=[2, 2], dtype=float64, place=CUDAPlace(0), stop_gradient=True,
        [[5.        , 6.        ],
        [0.        , 0.80000000]]))
        '''

[paddle-bot-old]

Thanks for your contribution!
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[TCChenlong]

LGTM

[paddle-bot-old]

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