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677 lines
27 KiB
677 lines
27 KiB
# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains U2 model."""
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import json
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import os
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import sys
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import time
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from collections import defaultdict
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from pathlib import Path
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from typing import Optional
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import numpy as np
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import paddle
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from paddle import distributed as dist
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from paddle.io import DataLoader
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from yacs.config import CfgNode
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from deepspeech.io.collator_st import KaldiPrePorocessedCollator
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from deepspeech.io.collator_st import SpeechCollator
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from deepspeech.io.collator_st import TripletKaldiPrePorocessedCollator
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from deepspeech.io.collator_st import TripletSpeechCollator
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from deepspeech.io.dataset import ManifestDataset
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from deepspeech.io.dataset import TripletManifestDataset
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from deepspeech.io.sampler import SortagradBatchSampler
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from deepspeech.io.sampler import SortagradDistributedBatchSampler
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from deepspeech.models.u2_st import U2STModel
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from deepspeech.training.gradclip import ClipGradByGlobalNormWithLog
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from deepspeech.training.scheduler import WarmupLR
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from deepspeech.training.trainer import Trainer
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from deepspeech.utils import bleu_score
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from deepspeech.utils import ctc_utils
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from deepspeech.utils import layer_tools
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from deepspeech.utils import mp_tools
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from deepspeech.utils import text_grid
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from deepspeech.utils import utility
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from deepspeech.utils.log import Log
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logger = Log(__name__).getlog()
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class U2STTrainer(Trainer):
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@classmethod
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def params(cls, config: Optional[CfgNode]=None) -> CfgNode:
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# training config
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default = CfgNode(
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dict(
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n_epoch=50, # train epochs
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log_interval=100, # steps
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accum_grad=1, # accum grad by # steps
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global_grad_clip=5.0, # the global norm clip
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))
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default.optim = 'adam'
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default.optim_conf = CfgNode(
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dict(
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lr=5e-4, # learning rate
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weight_decay=1e-6, # the coeff of weight decay
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))
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default.scheduler = 'warmuplr'
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default.scheduler_conf = CfgNode(
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dict(
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warmup_steps=25000,
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lr_decay=1.0, # learning rate decay
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))
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if config is not None:
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config.merge_from_other_cfg(default)
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return default
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def __init__(self, config, args):
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super().__init__(config, args)
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def train_batch(self, batch_index, batch_data, msg):
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train_conf = self.config.training
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start = time.time()
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utt, audio, audio_len, text, text_len = batch_data
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if isinstance(text, list) and isinstance(text_len, list):
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# joint training with ASR. Two decoding texts [translation, transcription]
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text, text_transcript = text
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text_len, text_transcript_len = text_len
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loss, st_loss, attention_loss, ctc_loss = self.model(
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audio, audio_len, text, text_len, text_transcript,
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text_transcript_len)
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else:
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loss, st_loss, attention_loss, ctc_loss = self.model(
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audio, audio_len, text, text_len)
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# loss div by `batch_size * accum_grad`
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loss /= train_conf.accum_grad
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loss.backward()
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layer_tools.print_grads(self.model, print_func=None)
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losses_np = {'loss': float(loss) * train_conf.accum_grad}
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losses_np['st_loss'] = float(st_loss)
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if attention_loss:
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losses_np['att_loss'] = float(attention_loss)
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if ctc_loss:
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losses_np['ctc_loss'] = float(ctc_loss)
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if (batch_index + 1) % train_conf.accum_grad == 0:
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self.optimizer.step()
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self.optimizer.clear_grad()
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self.lr_scheduler.step()
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self.iteration += 1
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iteration_time = time.time() - start
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if (batch_index + 1) % train_conf.log_interval == 0:
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msg += "train time: {:>.3f}s, ".format(iteration_time)
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msg += "batch size: {}, ".format(self.config.collator.batch_size)
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msg += "accum: {}, ".format(train_conf.accum_grad)
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msg += ', '.join('{}: {:>.6f}'.format(k, v)
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for k, v in losses_np.items())
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logger.info(msg)
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if dist.get_rank() == 0 and self.visualizer:
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losses_np_v = losses_np.copy()
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losses_np_v.update({"lr": self.lr_scheduler()})
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self.visualizer.add_scalars("step", losses_np_v,
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self.iteration - 1)
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@paddle.no_grad()
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def valid(self):
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self.model.eval()
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logger.info(f"Valid Total Examples: {len(self.valid_loader.dataset)}")
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valid_losses = defaultdict(list)
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num_seen_utts = 1
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total_loss = 0.0
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for i, batch in enumerate(self.valid_loader):
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utt, audio, audio_len, text, text_len = batch
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if isinstance(text, list) and isinstance(text_len, list):
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text, text_transcript = text
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text_len, text_transcript_len = text_len
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loss, st_loss, attention_loss, ctc_loss = self.model(
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audio, audio_len, text, text_len, text_transcript,
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text_transcript_len)
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else:
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loss, st_loss, attention_loss, ctc_loss = self.model(
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audio, audio_len, text, text_len)
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if paddle.isfinite(loss):
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num_utts = batch[1].shape[0]
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num_seen_utts += num_utts
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total_loss += float(st_loss) * num_utts
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valid_losses['val_loss'].append(float(st_loss))
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if attention_loss:
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valid_losses['val_att_loss'].append(float(attention_loss))
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if ctc_loss:
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valid_losses['val_ctc_loss'].append(float(ctc_loss))
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if (i + 1) % self.config.training.log_interval == 0:
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valid_dump = {k: np.mean(v) for k, v in valid_losses.items()}
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valid_dump['val_history_st_loss'] = total_loss / num_seen_utts
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# logging
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msg = f"Valid: Rank: {dist.get_rank()}, "
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msg += "epoch: {}, ".format(self.epoch)
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msg += "step: {}, ".format(self.iteration)
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msg += "batch: {}/{}, ".format(i + 1, len(self.valid_loader))
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msg += ', '.join('{}: {:>.6f}'.format(k, v)
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for k, v in valid_dump.items())
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logger.info(msg)
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logger.info('Rank {} Val info st_val_loss {}'.format(
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dist.get_rank(), total_loss / num_seen_utts))
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return total_loss, num_seen_utts
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def train(self):
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"""The training process control by step."""
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# !!!IMPORTANT!!!
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# Try to export the model by script, if fails, we should refine
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# the code to satisfy the script export requirements
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# script_model = paddle.jit.to_static(self.model)
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# script_model_path = str(self.checkpoint_dir / 'init')
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# paddle.jit.save(script_model, script_model_path)
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from_scratch = self.resume_or_scratch()
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if from_scratch:
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# save init model, i.e. 0 epoch
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self.save(tag='init')
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self.lr_scheduler.step(self.iteration)
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if self.parallel:
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self.train_loader.batch_sampler.set_epoch(self.epoch)
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logger.info(f"Train Total Examples: {len(self.train_loader.dataset)}")
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while self.epoch < self.config.training.n_epoch:
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self.model.train()
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try:
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data_start_time = time.time()
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for batch_index, batch in enumerate(self.train_loader):
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dataload_time = time.time() - data_start_time
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msg = "Train: Rank: {}, ".format(dist.get_rank())
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msg += "epoch: {}, ".format(self.epoch)
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msg += "step: {}, ".format(self.iteration)
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msg += "batch : {}/{}, ".format(batch_index + 1,
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len(self.train_loader))
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msg += "lr: {:>.8f}, ".format(self.lr_scheduler())
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msg += "data time: {:>.3f}s, ".format(dataload_time)
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self.train_batch(batch_index, batch, msg)
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data_start_time = time.time()
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except Exception as e:
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logger.error(e)
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raise e
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total_loss, num_seen_utts = self.valid()
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if dist.get_world_size() > 1:
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num_seen_utts = paddle.to_tensor(num_seen_utts)
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# the default operator in all_reduce function is sum.
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dist.all_reduce(num_seen_utts)
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total_loss = paddle.to_tensor(total_loss)
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dist.all_reduce(total_loss)
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cv_loss = total_loss / num_seen_utts
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cv_loss = float(cv_loss)
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else:
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cv_loss = total_loss / num_seen_utts
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logger.info(
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'Epoch {} Val info val_loss {}'.format(self.epoch, cv_loss))
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if self.visualizer:
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self.visualizer.add_scalars(
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'epoch', {'cv_loss': cv_loss,
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'lr': self.lr_scheduler()}, self.epoch)
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self.save(tag=self.epoch, infos={'val_loss': cv_loss})
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self.new_epoch()
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def setup_dataloader(self):
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config = self.config.clone()
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config.defrost()
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config.collator.keep_transcription_text = False
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# train/valid dataset, return token ids
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Dataset = TripletManifestDataset if config.model.model_conf.asr_weight > 0. else ManifestDataset
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config.data.manifest = config.data.train_manifest
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train_dataset = Dataset.from_config(config)
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config.data.manifest = config.data.dev_manifest
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dev_dataset = Dataset.from_config(config)
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if config.collator.raw_wav:
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if config.model.model_conf.asr_weight > 0.:
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Collator = TripletSpeechCollator
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TestCollator = SpeechCollator
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else:
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TestCollator = Collator = SpeechCollator
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# Not yet implement the mtl loader for raw_wav.
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else:
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if config.model.model_conf.asr_weight > 0.:
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Collator = TripletKaldiPrePorocessedCollator
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TestCollator = KaldiPrePorocessedCollator
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else:
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TestCollator = Collator = KaldiPrePorocessedCollator
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collate_fn_train = Collator.from_config(config)
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config.collator.augmentation_config = ""
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collate_fn_dev = Collator.from_config(config)
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if self.parallel:
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batch_sampler = SortagradDistributedBatchSampler(
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train_dataset,
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batch_size=config.collator.batch_size,
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num_replicas=None,
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rank=None,
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shuffle=True,
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drop_last=True,
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sortagrad=config.collator.sortagrad,
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shuffle_method=config.collator.shuffle_method)
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else:
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batch_sampler = SortagradBatchSampler(
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train_dataset,
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shuffle=True,
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batch_size=config.collator.batch_size,
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drop_last=True,
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sortagrad=config.collator.sortagrad,
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shuffle_method=config.collator.shuffle_method)
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self.train_loader = DataLoader(
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train_dataset,
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batch_sampler=batch_sampler,
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collate_fn=collate_fn_train,
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num_workers=config.collator.num_workers, )
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self.valid_loader = DataLoader(
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dev_dataset,
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batch_size=config.collator.batch_size,
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shuffle=False,
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drop_last=False,
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collate_fn=collate_fn_dev)
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# test dataset, return raw text
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config.data.manifest = config.data.test_manifest
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# filter test examples, will cause less examples, but no mismatch with training
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# and can use large batch size , save training time, so filter test egs now.
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# config.data.min_input_len = 0.0 # second
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# config.data.max_input_len = float('inf') # second
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# config.data.min_output_len = 0.0 # tokens
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# config.data.max_output_len = float('inf') # tokens
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# config.data.min_output_input_ratio = 0.00
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# config.data.max_output_input_ratio = float('inf')
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test_dataset = ManifestDataset.from_config(config)
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# return text ord id
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config.collator.keep_transcription_text = True
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config.collator.augmentation_config = ""
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self.test_loader = DataLoader(
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test_dataset,
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batch_size=config.decoding.batch_size,
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shuffle=False,
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drop_last=False,
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collate_fn=TestCollator.from_config(config))
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# return text token id
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config.collator.keep_transcription_text = False
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self.align_loader = DataLoader(
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test_dataset,
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batch_size=config.decoding.batch_size,
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shuffle=False,
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drop_last=False,
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collate_fn=TestCollator.from_config(config))
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logger.info("Setup train/valid/test/align Dataloader!")
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def setup_model(self):
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config = self.config
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model_conf = config.model
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model_conf.defrost()
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model_conf.input_dim = self.train_loader.collate_fn.feature_size
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model_conf.output_dim = self.train_loader.collate_fn.vocab_size
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model_conf.freeze()
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model = U2STModel.from_config(model_conf)
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if self.parallel:
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model = paddle.DataParallel(model)
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logger.info(f"{model}")
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layer_tools.print_params(model, logger.info)
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train_config = config.training
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optim_type = train_config.optim
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optim_conf = train_config.optim_conf
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scheduler_type = train_config.scheduler
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scheduler_conf = train_config.scheduler_conf
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if scheduler_type == 'expdecaylr':
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lr_scheduler = paddle.optimizer.lr.ExponentialDecay(
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learning_rate=optim_conf.lr,
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gamma=scheduler_conf.lr_decay,
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verbose=False)
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elif scheduler_type == 'warmuplr':
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lr_scheduler = WarmupLR(
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learning_rate=optim_conf.lr,
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warmup_steps=scheduler_conf.warmup_steps,
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verbose=False)
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elif scheduler_type == 'noam':
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lr_scheduler = paddle.optimizer.lr.NoamDecay(
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learning_rate=optim_conf.lr,
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d_model=model_conf.encoder_conf.output_size,
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warmup_steps=scheduler_conf.warmup_steps,
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verbose=False)
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else:
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raise ValueError(f"Not support scheduler: {scheduler_type}")
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grad_clip = ClipGradByGlobalNormWithLog(train_config.global_grad_clip)
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weight_decay = paddle.regularizer.L2Decay(optim_conf.weight_decay)
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if optim_type == 'adam':
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optimizer = paddle.optimizer.Adam(
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learning_rate=lr_scheduler,
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parameters=model.parameters(),
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weight_decay=weight_decay,
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grad_clip=grad_clip)
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else:
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raise ValueError(f"Not support optim: {optim_type}")
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self.model = model
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self.optimizer = optimizer
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self.lr_scheduler = lr_scheduler
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logger.info("Setup model/optimizer/lr_scheduler!")
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class U2STTester(U2STTrainer):
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@classmethod
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def params(cls, config: Optional[CfgNode]=None) -> CfgNode:
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# decoding config
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default = CfgNode(
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dict(
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alpha=2.5, # Coef of LM for beam search.
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beta=0.3, # Coef of WC for beam search.
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cutoff_prob=1.0, # Cutoff probability for pruning.
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cutoff_top_n=40, # Cutoff number for pruning.
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lang_model_path='models/lm/common_crawl_00.prune01111.trie.klm', # Filepath for language model.
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decoding_method='attention', # Decoding method. Options: 'attention', 'ctc_greedy_search',
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# 'ctc_prefix_beam_search', 'attention_rescoring'
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error_rate_type='bleu', # Error rate type for evaluation. Options `bleu`, 'char_bleu'
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num_proc_bsearch=8, # # of CPUs for beam search.
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beam_size=10, # Beam search width.
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batch_size=16, # decoding batch size
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ctc_weight=0.0, # ctc weight for attention rescoring decode mode.
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decoding_chunk_size=-1, # decoding chunk size. Defaults to -1.
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# <0: for decoding, use full chunk.
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# >0: for decoding, use fixed chunk size as set.
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# 0: used for training, it's prohibited here.
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num_decoding_left_chunks=-1, # number of left chunks for decoding. Defaults to -1.
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simulate_streaming=False, # simulate streaming inference. Defaults to False.
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))
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if config is not None:
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config.merge_from_other_cfg(default)
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return default
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def __init__(self, config, args):
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super().__init__(config, args)
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def ordid2token(self, texts, texts_len):
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""" ord() id to chr() chr """
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trans = []
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for text, n in zip(texts, texts_len):
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n = n.numpy().item()
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ids = text[:n]
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trans.append(''.join([chr(i) for i in ids]))
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return trans
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def compute_translation_metrics(self,
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utts,
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audio,
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audio_len,
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texts,
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texts_len,
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bleu_func,
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fout=None):
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cfg = self.config.decoding
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len_refs, num_ins = 0, 0
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start_time = time.time()
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text_feature = self.test_loader.collate_fn.text_feature
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refs = [
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"".join(chr(t) for t in text[:text_len])
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for text, text_len in zip(texts, texts_len)
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]
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# from IPython import embed
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# import os
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# embed()
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# os._exit(0)
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hyps = self.model.decode(
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audio,
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audio_len,
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text_feature=text_feature,
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decoding_method=cfg.decoding_method,
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lang_model_path=cfg.lang_model_path,
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beam_alpha=cfg.alpha,
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beam_beta=cfg.beta,
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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,
|
|
decoding_chunk_size=cfg.decoding_chunk_size,
|
|
num_decoding_left_chunks=cfg.num_decoding_left_chunks,
|
|
simulate_streaming=cfg.simulate_streaming)
|
|
decode_time = time.time() - start_time
|
|
|
|
for utt, target, result in zip(utts, refs, hyps):
|
|
len_refs += len(target.split())
|
|
num_ins += 1
|
|
if fout:
|
|
fout.write(utt + " " + result + "\n")
|
|
logger.info("\nReference: %s\nHypothesis: %s" % (target, result))
|
|
logger.info("One example BLEU = %s" %
|
|
(bleu_func([result], [[target]]).prec_str))
|
|
|
|
return dict(
|
|
hyps=hyps,
|
|
refs=refs,
|
|
bleu=bleu_func(hyps, [refs]).score,
|
|
len_refs=len_refs,
|
|
num_ins=num_ins, # num examples
|
|
num_frames=audio_len.sum().numpy().item(),
|
|
decode_time=decode_time)
|
|
|
|
@mp_tools.rank_zero_only
|
|
@paddle.no_grad()
|
|
def test(self):
|
|
assert self.args.result_file
|
|
self.model.eval()
|
|
logger.info(f"Test Total Examples: {len(self.test_loader.dataset)}")
|
|
|
|
cfg = self.config.decoding
|
|
bleu_func = bleu_score.char_bleu if cfg.error_rate_type == 'char-bleu' else bleu_score.bleu
|
|
|
|
stride_ms = self.test_loader.collate_fn.stride_ms
|
|
hyps, refs = [], []
|
|
len_refs, num_ins = 0, 0
|
|
num_frames = 0.0
|
|
num_time = 0.0
|
|
with open(self.args.result_file, 'w') as fout:
|
|
for i, batch in enumerate(self.test_loader):
|
|
metrics = self.compute_translation_metrics(
|
|
*batch, bleu_func=bleu_func, fout=fout)
|
|
hyps += metrics['hyps']
|
|
refs += metrics['refs']
|
|
bleu = metrics['bleu']
|
|
num_frames += metrics['num_frames']
|
|
num_time += metrics["decode_time"]
|
|
len_refs += metrics['len_refs']
|
|
num_ins += metrics['num_ins']
|
|
rtf = num_time / (num_frames * stride_ms)
|
|
logger.info("RTF: %f, BELU (%d) = %f" % (rtf, num_ins, bleu))
|
|
|
|
rtf = num_time / (num_frames * stride_ms)
|
|
msg = "Test: "
|
|
msg += "epoch: {}, ".format(self.epoch)
|
|
msg += "step: {}, ".format(self.iteration)
|
|
msg += "RTF: {}, ".format(rtf)
|
|
msg += "Test set [%s]: %s" % (len(hyps), str(bleu_func(hyps, [refs])))
|
|
logger.info(msg)
|
|
bleu_meta_path = os.path.splitext(self.args.result_file)[0] + '.bleu'
|
|
err_type_str = "BLEU"
|
|
with open(bleu_meta_path, 'w') as f:
|
|
data = json.dumps({
|
|
"epoch":
|
|
self.epoch,
|
|
"step":
|
|
self.iteration,
|
|
"rtf":
|
|
rtf,
|
|
err_type_str:
|
|
bleu_func(hyps, [refs]).score,
|
|
"dataset_hour": (num_frames * stride_ms) / 1000.0 / 3600.0,
|
|
"process_hour":
|
|
num_time / 1000.0 / 3600.0,
|
|
"num_examples":
|
|
num_ins,
|
|
"decode_method":
|
|
self.config.decoding.decoding_method,
|
|
})
|
|
f.write(data + '\n')
|
|
|
|
def run_test(self):
|
|
self.resume_or_scratch()
|
|
try:
|
|
self.test()
|
|
except KeyboardInterrupt:
|
|
sys.exit(-1)
|
|
|
|
@paddle.no_grad()
|
|
def align(self):
|
|
if self.config.decoding.batch_size > 1:
|
|
logger.fatal('alignment mode must be running with batch_size == 1')
|
|
sys.exit(1)
|
|
|
|
# xxx.align
|
|
assert self.args.result_file and self.args.result_file.endswith(
|
|
'.align')
|
|
|
|
self.model.eval()
|
|
logger.info(f"Align Total Examples: {len(self.align_loader.dataset)}")
|
|
|
|
stride_ms = self.align_loader.collate_fn.stride_ms
|
|
token_dict = self.align_loader.collate_fn.vocab_list
|
|
with open(self.args.result_file, 'w') as fout:
|
|
# one example in batch
|
|
for i, batch in enumerate(self.align_loader):
|
|
key, feat, feats_length, target, target_length = batch
|
|
|
|
# 1. Encoder
|
|
encoder_out, encoder_mask = self.model._forward_encoder(
|
|
feat, feats_length) # (B, maxlen, encoder_dim)
|
|
maxlen = encoder_out.size(1)
|
|
ctc_probs = self.model.ctc.log_softmax(
|
|
encoder_out) # (1, maxlen, vocab_size)
|
|
|
|
# 2. alignment
|
|
ctc_probs = ctc_probs.squeeze(0)
|
|
target = target.squeeze(0)
|
|
alignment = ctc_utils.forced_align(ctc_probs, target)
|
|
logger.info("align ids", key[0], alignment)
|
|
fout.write('{} {}\n'.format(key[0], alignment))
|
|
|
|
# 3. gen praat
|
|
# segment alignment
|
|
align_segs = text_grid.segment_alignment(alignment)
|
|
logger.info("align tokens", key[0], align_segs)
|
|
# IntervalTier, List["start end token\n"]
|
|
subsample = utility.get_subsample(self.config)
|
|
tierformat = text_grid.align_to_tierformat(
|
|
align_segs, subsample, token_dict)
|
|
# write tier
|
|
align_output_path = os.path.join(
|
|
os.path.dirname(self.args.result_file), "align")
|
|
tier_path = os.path.join(align_output_path, key[0] + ".tier")
|
|
with open(tier_path, 'w') as f:
|
|
f.writelines(tierformat)
|
|
# write textgrid
|
|
textgrid_path = os.path.join(align_output_path,
|
|
key[0] + ".TextGrid")
|
|
second_per_frame = 1. / (1000. /
|
|
stride_ms) # 25ms window, 10ms stride
|
|
second_per_example = (
|
|
len(alignment) + 1) * subsample * second_per_frame
|
|
text_grid.generate_textgrid(
|
|
maxtime=second_per_example,
|
|
intervals=tierformat,
|
|
output=textgrid_path)
|
|
|
|
def run_align(self):
|
|
self.resume_or_scratch()
|
|
try:
|
|
self.align()
|
|
except KeyboardInterrupt:
|
|
sys.exit(-1)
|
|
|
|
def load_inferspec(self):
|
|
"""infer model and input spec.
|
|
|
|
Returns:
|
|
nn.Layer: inference model
|
|
List[paddle.static.InputSpec]: input spec.
|
|
"""
|
|
from deepspeech.models.u2 import U2InferModel
|
|
infer_model = U2InferModel.from_pretrained(self.test_loader,
|
|
self.config.model.clone(),
|
|
self.args.checkpoint_path)
|
|
feat_dim = self.test_loader.collate_fn.feature_size
|
|
input_spec = [
|
|
paddle.static.InputSpec(shape=[1, None, feat_dim],
|
|
dtype='float32'), # audio, [B,T,D]
|
|
paddle.static.InputSpec(shape=[1],
|
|
dtype='int64'), # audio_length, [B]
|
|
]
|
|
return infer_model, input_spec
|
|
|
|
def export(self):
|
|
infer_model, input_spec = self.load_inferspec()
|
|
assert isinstance(input_spec, list), type(input_spec)
|
|
infer_model.eval()
|
|
static_model = paddle.jit.to_static(infer_model, input_spec=input_spec)
|
|
logger.info(f"Export code: {static_model.forward.code}")
|
|
paddle.jit.save(static_model, self.args.export_path)
|
|
|
|
def run_export(self):
|
|
try:
|
|
self.export()
|
|
except KeyboardInterrupt:
|
|
sys.exit(-1)
|
|
|
|
def setup(self):
|
|
"""Setup the experiment.
|
|
"""
|
|
paddle.set_device(self.args.device)
|
|
|
|
self.setup_output_dir()
|
|
self.setup_checkpointer()
|
|
|
|
self.setup_dataloader()
|
|
self.setup_model()
|
|
|
|
self.iteration = 0
|
|
self.epoch = 0
|
|
|
|
def setup_output_dir(self):
|
|
"""Create a directory used for output.
|
|
"""
|
|
# output dir
|
|
if self.args.output:
|
|
output_dir = Path(self.args.output).expanduser()
|
|
output_dir.mkdir(parents=True, exist_ok=True)
|
|
else:
|
|
output_dir = Path(
|
|
self.args.checkpoint_path).expanduser().parent.parent
|
|
output_dir.mkdir(parents=True, exist_ok=True)
|
|
|
|
self.output_dir = output_dir
|