espnet2.slu.postencoder.transformer_postencoder.TransformerPostEncoder

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class espnet2.slu.postencoder.transformer_postencoder.TransformerPostEncoder(input_size: int, output_size: int = 256, attention_heads: int = 4, linear_units: int = 2048, num_blocks: int = 6, dropout_rate: float = 0.1, positional_dropout_rate: float = 0.1, attention_dropout_rate: float = 0.0, input_layer: str | None = 'linear', pos_enc_class=<class 'espnet.nets.pytorch_backend.transformer.embedding.PositionalEncoding'>, normalize_before: bool = True, concat_after: bool = False, positionwise_layer_type: str = 'linear', positionwise_conv_kernel_size: int = 1, padding_idx: int = -1)

Bases: AbsPostEncoder

Transformer encoder module.

• Parameters:
  • input_size – input dim
  • output_size – dimension of attention
  • attention_heads – the number of heads of multi head attention
  • linear_units – the number of units of position-wise feed forward
  • num_blocks – the number of decoder blocks
  • dropout_rate – dropout rate
  • attention_dropout_rate – dropout rate in attention
  • positional_dropout_rate – dropout rate after adding positional encoding
  • input_layer – input layer type
  • pos_enc_class – PositionalEncoding or ScaledPositionalEncoding
  • normalize_before – whether to use layer_norm before the first block
  • concat_after – whether to concat attention layer’s input and output if True, additional linear will be applied. i.e. x -> x + linear(concat(x, att(x))) if False, no additional linear will be applied. i.e. x -> x + att(x)
  • positionwise_layer_type – linear of conv1d
  • positionwise_conv_kernel_size – kernel size of positionwise conv1d layer
  • padding_idx – padding_idx for input_layer=embed

Initializes internal Module state, shared by both nn.Module and ScriptModule.

forward(xs_pad: Tensor, ilens: Tensor, prev_states: Tensor | None = None) → Tuple[Tensor, Tensor, Tensor | None]

Embed positions in tensor.

• Parameters:
  • xs_pad – input tensor (B, L, D)
  • ilens – input length (B)
  • prev_states – Not to be used now.
• Returns: position embedded tensor and mask

output_size() → int