align

Speech Alignment

Before runing an Align example, you should refer to the ASR recipe to get the trained ASR model first:

source env.sh
bash examples/align/$dataset_name/run.sh

Core Stages(stage1-3 is ASR stages, stage4 is Align stage):

(1) Data preparation

Before you run examples/asr/$dataset_name/run.sh, you should download the coorsponding dataset and store it in examples/asr/$dataset_name/data. The script examples/asr/$dataset_name/local/prepare_data.py would generate the desired csv file decripting the dataset

(2) Data normalization

With the generated csv file, we should compute the cmvn file firstly like this

$ python athena/cmvn_main.py examples/asr/$dataset_name/configs/mpc.json examples/asr/$dataset_name/data/all.csv

(3) Acoustic model training

You can train a transformer model using json file examples/asr/$dataset_name/configs/transformer.json or train a mtl_transformer_ctc model using json file examples/asr/$dataset_name/configs/mtl_transformer.json

(4) CTC alignment

After trained a transformer model, we provide the CTC alignment method for aligning the speech and label on frame level. To use it, run

$ python athena/alignment.py examples/align/$dataset_name/configs/mtl_transformer.align.json

(5) Alignment result

The CTC alignment result of one utterance is shown below, we can see the output of ctc alignment is with time delayed