TransformerDecoder
class paddle.nn. TransformerDecoder ( decoder_layer, num_layers, norm=None ) [源代码]
Transformer解码器
Transformer解码器由多个Transformer解码器层(TransformerDecoderLayer
)叠加组成的。
参数:
decoder_layer (Layer) -
TransformerDecoderLayer
的一个实例,作为Transformer解码器的第一层,其他层将根据它的配置进行构建。num_layers (int) -
TransformerDecoderLayer
层的叠加数量。norm (LayerNorm,可选) - 层标准化(Layer Normalization)。如果提供该参数,将对解码器的最后一层的输出进行层标准化。
代码示例:
import paddle
from paddle.nn import TransformerDecoderLayer, TransformerDecoder
# decoder input: [batch_size, tgt_len, d_model]
dec_input = paddle.rand((2, 4, 128))
# encoder output: [batch_size, src_len, d_model]
enc_output = paddle.rand((2, 6, 128))
# self attention mask: [batch_size, n_head, tgt_len, tgt_len]
self_attn_mask = paddle.rand((2, 2, 4, 4))
# cross attention mask: [batch_size, n_head, tgt_len, src_len]
cross_attn_mask = paddle.rand((2, 2, 4, 6))
decoder_layer = TransformerDecoderLayer(128, 2, 512)
decoder = TransformerDecoder(decoder_layer, 2)
output = decoder(dec_input,
enc_output,
self_attn_mask,
cross_attn_mask) # [2, 4, 128]