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# ############################################################################
# Model: E2E ASR with Transformer + wav2vec2
# Encoder: wav2vec Encoder
# Decoder: Transformer Decoder + (CTC/ATT joint) beamsearch
# Tokens: BPE with unigram
# losses: CTC + KLdiv (Label Smoothing loss)
# Training: AISHELL-1
# Authors: Jianyuan Zhong, Titouan Parcollet, Mirco Ravanelli
# ############################################################################
# Feature parameters
sample_rate: 16000
n_fft: 400
n_mels: 80
wav2vec2_hub: facebook/wav2vec2-large-100k-voxpopuli
####################### Model parameters ###########################
# Transformer
d_model: 256
nhead: 4
num_encoder_layers: 2
num_decoder_layers: 6
d_ffn: 2048
transformer_dropout: 0.1
activation: !name:torch.nn.GELU
output_neurons: 5000
vocab_size: 5000
# Outputs
blank_index: 0
label_smoothing: 0.1
pad_index: 0
bos_index: 1
eos_index: 2
unk_index: 0
# Decoding parameters
min_decode_ratio: 0.0
max_decode_ratio: 1.0
valid_search_interval: 10
valid_beam_size: 10
test_beam_size: 10
ctc_weight_decode: 0.40
############################## models ################################
wav2vec2: !new:speechbrain.lobes.models.huggingface_wav2vec.HuggingFaceWav2Vec2
source: !ref <wav2vec2_hub>
output_norm: True
freeze: True
pretrain: False # Pretraining is managed by the SpeechBrain pre-trainer.
save_path: model_checkpoints
Transformer: !new:speechbrain.lobes.models.transformer.TransformerASR.TransformerASR # yamllint disable-line rule:line-length
input_size: 1024
tgt_vocab: !ref <output_neurons>
d_model: !ref <d_model>
nhead: !ref <nhead>
num_encoder_layers: !ref <num_encoder_layers>
num_decoder_layers: !ref <num_decoder_layers>
d_ffn: !ref <d_ffn>
dropout: !ref <transformer_dropout>
activation: !ref <activation>
normalize_before: True
ctc_lin: !new:speechbrain.nnet.linear.Linear
input_size: !ref <d_model>
n_neurons: !ref <output_neurons>
seq_lin: !new:speechbrain.nnet.linear.Linear
input_size: !ref <d_model>
n_neurons: !ref <output_neurons>
tokenizer: !new:sentencepiece.SentencePieceProcessor
asr_model: !new:torch.nn.ModuleList
- [!ref <Transformer>, !ref <seq_lin>, !ref <ctc_lin>]
# Here, we extract the encoder from the Transformer model
Tencoder: !new:speechbrain.lobes.models.transformer.TransformerASR.EncoderWrapper
transformer: !ref <Transformer>
# We compose the inference (encoder) pipeline.
encoder: !new:speechbrain.nnet.containers.LengthsCapableSequential
input_shape: [null, null, !ref <n_mels>]
wav2vec2: !ref <wav2vec2>
transformer_encoder: !ref <Tencoder>
decoder: !new:speechbrain.decoders.S2STransformerBeamSearch
modules: [!ref <Transformer>, !ref <seq_lin>, !ref <ctc_lin>]
bos_index: !ref <bos_index>
eos_index: !ref <eos_index>
blank_index: !ref <blank_index>
min_decode_ratio: !ref <min_decode_ratio>
max_decode_ratio: !ref <max_decode_ratio>
beam_size: !ref <test_beam_size>
ctc_weight: !ref <ctc_weight_decode>
using_eos_threshold: False
length_normalization: True
modules:
encoder: !ref <encoder>
decoder: !ref <decoder>
log_softmax: !new:torch.nn.LogSoftmax
dim: -1
pretrainer: !new:speechbrain.utils.parameter_transfer.Pretrainer
loadables:
wav2vec2: !ref <wav2vec2>
model: !ref <asr_model>
tokenizer: !ref <tokenizer>
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