infer.py

# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import argparse
import os
import subprocess
from typing import List
from typing import Optional
from typing import Union

import kaldi_io
import numpy as np
import paddle
from kaldiio import WriteHelper
from paddlespeech.s2t.frontend.featurizer.text_featurizer import TextFeaturizer
from paddlespeech.s2t.utils.dynamic_import import dynamic_import
from paddlespeech.s2t.utils.utility import UpdateConfig
from yacs.config import CfgNode

from ..executor import BaseExecutor
from ..utils import cli_register
from ..utils import download_and_decompress
from ..utils import logger
from ..utils import MODEL_HOME

__all__ = ["STExecutor"]

pretrained_models = {
    "fat_st_ted_en_zh": {
        "url":
        "https://paddlespeech.bj.bcebos.com/s2t/ted_en_zh/st1/fat_st_mtl.model.tar.gz",
        "md5":
        "210b8eacc390d9965334fa8e96c49a13",
        "cfg_path":
        "conf/transformer_mtl_noam.yaml",
        "ckpt_path":
        "exp/transformer_mtl_noam/checkpoints/fat_st_ted_en_zh",
    }
}

model_alias = {"fat_st": "paddlespeech.s2t.models.u2_st:U2STModel"}

kaldi_bins = {
    "url":
    "https://paddlespeech.bj.bcebos.com/s2t/ted_en_zh/st1/kaldi_bins.tar.gz",
    "md5":
    "c0682303b3f3393dbf6ed4c4e35a53eb",
}


@cli_register(
    name="paddlespeech.st", description="Speech translation infer command.")
class STExecutor(BaseExecutor):
    def __init__(self):
        super(STExecutor, self).__init__()

        self.parser = argparse.ArgumentParser(
            prog="paddlespeech.st", add_help=True)
        self.parser.add_argument(
            "--input", type=str, required=True, help="Audio file to translate.")
        self.parser.add_argument(
            "--model",
            type=str,
            default="fat_st",
            help="Choose model type of st task.")
        self.parser.add_argument(
            "--lang",
            type=str,
            default="ted_en_zh",
            help="Choose model language.")
        self.parser.add_argument(
            "--config",
            type=str,
            default=None,
            help="Config of st task. Use deault config when it is None.")
        self.parser.add_argument(
            "--ckpt_path",
            type=str,
            default=None,
            help="Checkpoint file of model.")
        self.parser.add_argument(
            "--device",
            type=str,
            default=paddle.get_device(),
            help="Choose device to execute model inference.")

    def _get_pretrained_path(self, tag: str) -> os.PathLike:
        """
            Download and returns pretrained resources path of current task.
        """
        assert tag in pretrained_models, "Can not find pretrained resources of {}.".format(
            tag)

        res_path = os.path.join(MODEL_HOME, tag)
        decompressed_path = download_and_decompress(pretrained_models[tag],
                                                    res_path)
        decompressed_path = os.path.abspath(decompressed_path)
        logger.info(
            "Use pretrained model stored in: {}".format(decompressed_path))

        return decompressed_path

    def _set_kaldi_bins(self) -> os.PathLike:
        """
            Download and returns kaldi_bins resources path of current task.
        """
        decompressed_path = download_and_decompress(kaldi_bins, MODEL_HOME)
        decompressed_path = os.path.abspath(decompressed_path)
        logger.info("Kaldi_bins stored in: {}".format(decompressed_path))
        os.environ['LD_LIBRARY_PATH'] += f':{decompressed_path}'
        os.environ["PATH"] += f":{decompressed_path}"
        return decompressed_path

    def _init_from_path(self,
                        model_type: str="fat_st",
                        lang: str="zh",
                        cfg_path: Optional[os.PathLike]=None,
                        ckpt_path: Optional[os.PathLike]=None):
        """
            Init model and other resources from a specific path.
        """
        if cfg_path is None or ckpt_path is None:
            tag = model_type + "_" + lang
            res_path = self._get_pretrained_path(tag)
            self.cfg_path = os.path.join(res_path,
                                         pretrained_models[tag]["cfg_path"])
            self.ckpt_path = os.path.join(res_path,
                                          pretrained_models[tag]["ckpt_path"])
            logger.info(res_path)
            logger.info(self.cfg_path)
            logger.info(self.ckpt_path)
        else:
            self.cfg_path = os.path.abspath(cfg_path)
            self.ckpt_path = os.path.abspath(ckpt_path)
            res_path = os.path.dirname(
                os.path.dirname(os.path.abspath(self.cfg_path)))

        #Init body.
        self.config = CfgNode(new_allowed=True)
        self.config.merge_from_file(self.cfg_path)
        self.config.decoding.decoding_method = "fullsentence"

        with UpdateConfig(self.config):
            self.config.collator.vocab_filepath = os.path.join(
                res_path, self.config.collator.vocab_filepath)
            self.config.collator.cmvn_path = os.path.join(
                res_path, self.config.collator.cmvn_path)
            self.config.collator.spm_model_prefix = os.path.join(
                res_path, self.config.collator.spm_model_prefix)
            self.text_feature = TextFeaturizer(
                unit_type=self.config.collator.unit_type,
                vocab_filepath=self.config.collator.vocab_filepath,
                spm_model_prefix=self.config.collator.spm_model_prefix)
            self.config.model.input_dim = self.config.collator.feat_dim
            self.config.model.output_dim = self.text_feature.vocab_size

        model_conf = self.config.model
        logger.info(model_conf)
        model_class = dynamic_import(model_type, model_alias)
        self.model = model_class.from_config(model_conf)
        self.model.eval()

        # load model
        params_path = self.ckpt_path + ".pdparams"
        model_dict = paddle.load(params_path)
        self.model.set_state_dict(model_dict)

        # set kaldi bins
        self._set_kaldi_bins()

    def preprocess(self, wav_file: Union[str, os.PathLike], model_type: str):
        """
            Input preprocess and return paddle.Tensor stored in self.input.
            Input content can be a file(wav).
        """
        audio_file = os.path.abspath(wav_file)
        logger.info("Preprocess audio_file:" + audio_file)

        if model_type == "fat_st":
            cmvn = self.config.collator.cmvn_path
            utt_name = "_tmp"

            # Get the object for feature extraction
            fbank_extract_command = [
                "compute-fbank-feats", "--num-mel-bins=80", "--verbose=2",
                "--sample-frequency=16000", "scp:-", "ark:-"
            ]
            fbank_extract_process = subprocess.Popen(
                fbank_extract_command,
                stdin=subprocess.PIPE,
                stdout=subprocess.PIPE)
            fbank_extract_process.stdin.write(
                f"{utt_name} {wav_file}".encode("utf8"))
            fbank_extract_process.stdin.close()
            fbank_feat = dict(
                kaldi_io.read_mat_ark(fbank_extract_process.stdout))[utt_name]

            extract_command = ["compute-kaldi-pitch-feats", "scp:-", "ark:-"]
            pitch_extract_process = subprocess.Popen(
                extract_command, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
            pitch_extract_process.stdin.write(
                f"{utt_name} {wav_file}".encode("utf8"))
            process_command = ["process-kaldi-pitch-feats", "ark:", "ark:-"]
            pitch_process = subprocess.Popen(
                process_command,
                stdin=pitch_extract_process.stdout,
                stdout=subprocess.PIPE)
            pitch_extract_process.stdin.close()
            pitch_feat = dict(
                kaldi_io.read_mat_ark(pitch_process.stdout))[utt_name]
            concated_feat = np.concatenate((fbank_feat, pitch_feat), axis=1)
            raw_feat = f"{utt_name}.raw"
            with WriteHelper(
                    f"ark,scp:{raw_feat}.ark,{raw_feat}.scp") as writer:
                writer(utt_name, concated_feat)
            cmvn_command = [
                "apply-cmvn", "--norm-vars=true", cmvn, f"scp:{raw_feat}.scp",
                "ark:-"
            ]
            cmvn_process = subprocess.Popen(
                cmvn_command, stdout=subprocess.PIPE)
            process_command = [
                "copy-feats", "--compress=true", "ark:-", "ark:-"
            ]
            process = subprocess.Popen(
                process_command,
                stdin=cmvn_process.stdout,
                stdout=subprocess.PIPE)
            norm_feat = dict(kaldi_io.read_mat_ark(process.stdout))[utt_name]
            self.audio = paddle.to_tensor(norm_feat).unsqueeze(0)
            self.audio_len = paddle.to_tensor(
                self.audio.shape[1], dtype="int64")
            logger.info(f"audio feat shape: {self.audio.shape}")
        else:
            raise ValueError("Wrong model type.")

    @paddle.no_grad()
    def infer(self, model_type: str):
        """
            Model inference and result stored in self.output.
        """
        cfg = self.config.decoding
        audio = self.audio
        audio_len = self.audio_len
        if model_type == "fat_st":
            hyps = self.model.decode(
                audio,
                audio_len,
                text_feature=self.text_feature,
                decoding_method=cfg.decoding_method,
                lang_model_path=None,
                beam_alpha=cfg.alpha,
                beam_beta=cfg.beta,
                beam_size=cfg.beam_size,
                cutoff_prob=cfg.cutoff_prob,
                cutoff_top_n=cfg.cutoff_top_n,
                num_processes=cfg.num_proc_bsearch,
                ctc_weight=cfg.ctc_weight,
                word_reward=cfg.word_reward,
                decoding_chunk_size=cfg.decoding_chunk_size,
                num_decoding_left_chunks=cfg.num_decoding_left_chunks,
                simulate_streaming=cfg.simulate_streaming)
            self.result_transcripts = hyps
        else:
            raise ValueError("Wrong model type.")

    def postprocess(self, model_type: str) -> Union[str, os.PathLike]:
        """
            Output postprocess and return human-readable results such as texts and audio files.
        """
        if model_type == "fat_st":
            return self.result_transcripts
        else:
            raise ValueError("Wrong model type.")

    def execute(self, argv: List[str]) -> bool:
        """
            Command line entry.
        """
        parser_args = self.parser.parse_args(argv)

        model = parser_args.model
        lang = parser_args.lang
        config = parser_args.config
        ckpt_path = parser_args.ckpt_path
        audio_file = parser_args.input
        device = parser_args.device

        try:
            res = self(model, lang, config, ckpt_path, audio_file, device)
            logger.info('ST Result: {}'.format(res))
            return True
        except Exception as e:
            print(e)
            return False

    def __call__(self, model, lang, config, ckpt_path, audio_file, device):
        """
            Python API to call an executor.
        """
        audio_file = os.path.abspath(audio_file)
        paddle.set_device(device)
        self._init_from_path(model, lang, config, ckpt_path)
        self.preprocess(audio_file, model)
        self.infer(model)
        res = self.postprocess(model)

        return res