#!/usr/bin/env python3 # 2021, Carnegie Mellon University; Siddhant Arora # Apache 2.0 (http://www.apache.org/licenses/LICENSE-2.0) """Conformers PostEncoder.""" import logging from typing import Tuple import torch from typeguard import check_argument_types from espnet2.asr.postencoder.abs_postencoder import AbsPostEncoder from espnet.nets.pytorch_backend.conformer.convolution import ConvolutionModule from espnet.nets.pytorch_backend.conformer.encoder_layer import EncoderLayer from espnet.nets.pytorch_backend.nets_utils import get_activation, make_pad_mask from espnet.nets.pytorch_backend.transformer.attention import ( # noqa: H301 LegacyRelPositionMultiHeadedAttention, MultiHeadedAttention, RelPositionMultiHeadedAttention, ) from espnet.nets.pytorch_backend.transformer.embedding import ( # noqa: H301 LegacyRelPositionalEncoding, PositionalEncoding, RelPositionalEncoding, ScaledPositionalEncoding, ) from espnet.nets.pytorch_backend.transformer.layer_norm import LayerNorm from espnet.nets.pytorch_backend.transformer.multi_layer_conv import ( Conv1dLinear, MultiLayeredConv1d, ) from espnet.nets.pytorch_backend.transformer.positionwise_feed_forward import ( PositionwiseFeedForward, ) from espnet.nets.pytorch_backend.transformer.repeat import repeat class ConformerPostEncoder(AbsPostEncoder): """Hugging Face Transformers PostEncoder.""" """Conformer encoder module. Args: input_size (int): Input dimension. output_size (int): Dimension of attention. attention_heads (int): The number of heads of multi head attention. linear_units (int): The number of units of position-wise feed forward. num_blocks (int): The number of decoder blocks. dropout_rate (float): Dropout rate. attention_dropout_rate (float): Dropout rate in attention. positional_dropout_rate (float): Dropout rate after adding positional encoding. input_layer (Union[str, torch.nn.Module]): Input layer type. normalize_before (bool): Whether to use layer_norm before the first block. concat_after (bool): 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 (str): "linear", "conv1d", or "conv1d-linear". positionwise_conv_kernel_size (int): Kernel size of positionwise conv1d layer. rel_pos_type (str): Whether to use the latest relative positional encoding or the legacy one. The legacy relative positional encoding will be deprecated in the future. More Details can be found in https://github.com/espnet/espnet/pull/2816. encoder_pos_enc_layer_type (str): Encoder positional encoding layer type. encoder_attn_layer_type (str): Encoder attention layer type. activation_type (str): Encoder activation function type. macaron_style (bool): Whether to use macaron style for positionwise layer. use_cnn_module (bool): Whether to use convolution module. zero_triu (bool): Whether to zero the upper triangular part of attention matrix. cnn_module_kernel (int): Kernerl size of convolution module. padding_idx (int): Padding idx for input_layer=embed. """ def __init__( self, 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 = "linear", normalize_before: bool = True, concat_after: bool = False, positionwise_layer_type: str = "linear", positionwise_conv_kernel_size: int = 3, macaron_style: bool = False, rel_pos_type: str = "legacy", pos_enc_layer_type: str = "rel_pos", selfattention_layer_type: str = "rel_selfattn", activation_type: str = "swish", use_cnn_module: bool = True, zero_triu: bool = False, cnn_module_kernel: int = 31, padding_idx: int = -1, ): assert check_argument_types() super().__init__() self._output_size = output_size if rel_pos_type == "legacy": if pos_enc_layer_type == "rel_pos": pos_enc_layer_type = "legacy_rel_pos" if selfattention_layer_type == "rel_selfattn": selfattention_layer_type = "legacy_rel_selfattn" elif rel_pos_type == "latest": assert selfattention_layer_type != "legacy_rel_selfattn" assert pos_enc_layer_type != "legacy_rel_pos" else: raise ValueError("unknown rel_pos_type: " + rel_pos_type) activation = get_activation(activation_type) if pos_enc_layer_type == "abs_pos": pos_enc_class = PositionalEncoding elif pos_enc_layer_type == "scaled_abs_pos": pos_enc_class = ScaledPositionalEncoding elif pos_enc_layer_type == "rel_pos": assert selfattention_layer_type == "rel_selfattn" pos_enc_class = RelPositionalEncoding elif pos_enc_layer_type == "legacy_rel_pos": assert selfattention_layer_type == "legacy_rel_selfattn" pos_enc_class = LegacyRelPositionalEncoding logging.warning( "Using legacy_rel_pos and it will be deprecated in the future." ) elif pos_enc_layer_type == "None": pos_enc_class = None else: raise ValueError("unknown pos_enc_layer: " + pos_enc_layer_type) if input_layer == "linear": self.embed = torch.nn.Sequential( pos_enc_class(output_size, positional_dropout_rate), ) elif isinstance(input_layer, torch.nn.Module): self.embed = torch.nn.Sequential( input_layer, pos_enc_class(output_size, positional_dropout_rate), ) elif input_layer == "None": self.embed = None else: raise ValueError("unknown input_layer: " + input_layer) self.normalize_before = normalize_before if positionwise_layer_type == "linear": positionwise_layer = PositionwiseFeedForward positionwise_layer_args = ( output_size, linear_units, dropout_rate, activation, ) elif positionwise_layer_type == "conv1d": positionwise_layer = MultiLayeredConv1d positionwise_layer_args = ( output_size, linear_units, positionwise_conv_kernel_size, dropout_rate, ) elif positionwise_layer_type == "conv1d-linear": positionwise_layer = Conv1dLinear positionwise_layer_args = ( output_size, linear_units, positionwise_conv_kernel_size, dropout_rate, ) else: raise NotImplementedError("Support only linear or conv1d.") if selfattention_layer_type == "selfattn": encoder_selfattn_layer = MultiHeadedAttention encoder_selfattn_layer_args = ( attention_heads, output_size, attention_dropout_rate, ) elif selfattention_layer_type == "legacy_rel_selfattn": assert pos_enc_layer_type == "legacy_rel_pos" encoder_selfattn_layer = LegacyRelPositionMultiHeadedAttention encoder_selfattn_layer_args = ( attention_heads, output_size, attention_dropout_rate, ) logging.warning( "Using legacy_rel_selfattn and it will be deprecated in the future." ) elif selfattention_layer_type == "rel_selfattn": assert pos_enc_layer_type == "rel_pos" encoder_selfattn_layer = RelPositionMultiHeadedAttention encoder_selfattn_layer_args = ( attention_heads, output_size, attention_dropout_rate, zero_triu, ) else: raise ValueError("unknown encoder_attn_layer: " + selfattention_layer_type) convolution_layer = ConvolutionModule convolution_layer_args = (output_size, cnn_module_kernel, activation) self.encoders = repeat( num_blocks, lambda lnum: EncoderLayer( output_size, encoder_selfattn_layer(*encoder_selfattn_layer_args), positionwise_layer(*positionwise_layer_args), positionwise_layer(*positionwise_layer_args) if macaron_style else None, convolution_layer(*convolution_layer_args) if use_cnn_module else None, dropout_rate, normalize_before, concat_after, ), ) if self.normalize_before: self.after_norm = LayerNorm(output_size) def forward( self, input: torch.Tensor, input_lengths: torch.Tensor ) -> Tuple[torch.Tensor, torch.Tensor]: """Forward.""" xs_pad = input masks = (~make_pad_mask(input_lengths)).to(input[0].device) # print(mask) if self.embed is None: xs_pad = xs_pad else: xs_pad = self.embed(xs_pad) masks = masks.reshape(masks.shape[0], 1, masks.shape[1]) xs_pad, masks = self.encoders(xs_pad, masks) if isinstance(xs_pad, tuple): xs_pad = xs_pad[0] if self.normalize_before: xs_pad = self.after_norm(xs_pad) olens = masks.squeeze(1).sum(1) return xs_pad, olens def output_size(self) -> int: """Get the output size.""" return self._output_size