LayerList¶

class paddle.nn. LayerList ( sublayers=None ) [source]

LayerList holds sublayers, and sublayers it contains are properly registered. Holded sublayers can be indexed like a regular python list.

Parameters

sublayers (iterable of Layer, optional) – sublayers to hold

Examples

import paddle

class MyLayer(paddle.nn.Layer):
    def __init__(self):
        super().__init__()
        self.linears = paddle.nn.LayerList(
            [paddle.nn.Linear(10, 10) for i in range(10)])

    def forward(self, x):
        # LayerList can act as an iterable, or be indexed using ints
        for i, l in enumerate(self.linears):
            x = self.linears[i // 2](x) + l(x)
        return x

append ( sublayer )

append¶

Appends a sublayer to the end of the list.

Parameters

sublayer (Layer) – sublayer to append

Examples

import paddle

linears = paddle.nn.LayerList([paddle.nn.Linear(10, 10) for i in range(10)])
another = paddle.nn.Linear(10, 10)
linears.append(another)
print(len(linears))  # 11

insert ( index, sublayer )

insert¶

Insert a sublayer before a given index in the list.

Parameters

• index (int) – index to insert.

• sublayer (Layer) – sublayer to insert

Examples

import paddle

linears = paddle.nn.LayerList([paddle.nn.Linear(10, 10) for i in range(10)])
another = paddle.nn.Linear(10, 10)
linears.insert(3, another)
print(linears[3] is another)  # True
another = paddle.nn.Linear(10, 10)
linears.insert(-1, another)
print(linears[-2] is another) # True

extend ( sublayers )

extend¶

Appends sublayers to the end of the list.

Parameters

sublayers (iterable of Layer) – iterable of sublayers to append

Examples

import paddle

linears = paddle.nn.LayerList([paddle.nn.Linear(10, 10) for i in range(10)])
another_list = paddle.nn.LayerList([paddle.nn.Linear(10, 10) for i in range(5)])
linears.extend(another_list)
print(len(linears))  # 15
print(another_list[0] is linears[10])  # True