class OptimizerParams(optimization.OptimizationConfig): """Optimizer parameters for MobileBERT-EdgeTPU.""" optimizer: optimization.OptimizerConfig = optimization.OptimizerConfig( type='adamw', adamw=optimization.AdamWeightDecayConfig( weight_decay_rate=0.01, exclude_from_weight_decay=['LayerNorm', 'layer_norm', 'bias'])) learning_rate: optimization.LrConfig = optimization.LrConfig( type='polynomial', polynomial=optimization.PolynomialLrConfig(initial_learning_rate=1e-4, decay_steps=1000000, end_learning_rate=0.0)) warmup: optimization.WarmupConfig = optimization.WarmupConfig( type='polynomial', polynomial=optimization.PolynomialWarmupConfig(warmup_steps=10000))
def prepare_config(self, teacher_block_num, student_block_num, transfer_teacher_layers): # using small model for testing task_config = distillation.BertDistillationTaskConfig( teacher_model=bert.PretrainerConfig(encoder=encoders.EncoderConfig( type='mobilebert', mobilebert=encoders.MobileBertEncoderConfig( num_blocks=teacher_block_num)), cls_heads=[ bert.ClsHeadConfig( inner_dim=256, num_classes=2, dropout_rate=0.1, name='next_sentence') ], mlm_activation='gelu'), student_model=bert.PretrainerConfig(encoder=encoders.EncoderConfig( type='mobilebert', mobilebert=encoders.MobileBertEncoderConfig( num_blocks=student_block_num)), cls_heads=[ bert.ClsHeadConfig( inner_dim=256, num_classes=2, dropout_rate=0.1, name='next_sentence') ], mlm_activation='relu'), train_data=pretrain_dataloader.BertPretrainDataConfig( input_path='dummy', max_predictions_per_seq=76, seq_length=512, global_batch_size=10), validation_data=pretrain_dataloader.BertPretrainDataConfig( input_path='dummy', max_predictions_per_seq=76, seq_length=512, global_batch_size=10)) # set only 1 step for each stage progressive_config = distillation.BertDistillationProgressiveConfig() progressive_config.layer_wise_distill_config.transfer_teacher_layers = ( transfer_teacher_layers) progressive_config.layer_wise_distill_config.num_steps = 1 progressive_config.pretrain_distill_config.num_steps = 1 optimization_config = optimization.OptimizationConfig( optimizer=optimization.OptimizerConfig( type='lamb', lamb=optimization.LAMBConfig(weight_decay_rate=0.0001, exclude_from_weight_decay=[ 'LayerNorm', 'layer_norm', 'bias', 'no_norm' ])), learning_rate=optimization.LrConfig( type='polynomial', polynomial=optimization.PolynomialLrConfig( initial_learning_rate=1.5e-3, decay_steps=10000, end_learning_rate=1.5e-3)), warmup=optimization.WarmupConfig( type='linear', linear=optimization.LinearWarmupConfig( warmup_learning_rate=0))) exp_config = cfg.ExperimentConfig( task=task_config, trainer=prog_trainer_lib.ProgressiveTrainerConfig( progressive=progressive_config, optimizer_config=optimization_config)) # Create a teacher model checkpoint. teacher_encoder = encoders.build_encoder( task_config.teacher_model.encoder) pretrainer_config = task_config.teacher_model if pretrainer_config.cls_heads: teacher_cls_heads = [ layers.ClassificationHead(**cfg.as_dict()) for cfg in pretrainer_config.cls_heads ] else: teacher_cls_heads = [] masked_lm = layers.MobileBertMaskedLM( embedding_table=teacher_encoder.get_embedding_table(), activation=tf_utils.get_activation( pretrainer_config.mlm_activation), initializer=tf.keras.initializers.TruncatedNormal( stddev=pretrainer_config.mlm_initializer_range), name='cls/predictions') teacher_pretrainer = models.BertPretrainerV2( encoder_network=teacher_encoder, classification_heads=teacher_cls_heads, customized_masked_lm=masked_lm) # The model variables will be created after the forward call. _ = teacher_pretrainer(teacher_pretrainer.inputs) teacher_pretrainer_ckpt = tf.train.Checkpoint( **teacher_pretrainer.checkpoint_items) teacher_ckpt_path = os.path.join(self.get_temp_dir(), 'teacher_model.ckpt') teacher_pretrainer_ckpt.save(teacher_ckpt_path) exp_config.task.teacher_model_init_checkpoint = self.get_temp_dir() return exp_config
from official.nlp.data import pretrain_dataloader from official.nlp.projects.mobilebert import distillation FLAGS = flags.FLAGS optimization_config = optimization.OptimizationConfig( optimizer=optimization.OptimizerConfig( type='lamb', lamb=optimization.LAMBConfig( weight_decay_rate=0.01, exclude_from_weight_decay=['LayerNorm', 'bias', 'norm'], clipnorm=1.0)), learning_rate=optimization.LrConfig( type='polynomial', polynomial=optimization.PolynomialLrConfig( initial_learning_rate=1.5e-3, decay_steps=10000, end_learning_rate=1.5e-3)), warmup=optimization.WarmupConfig( type='linear', linear=optimization.LinearWarmupConfig(warmup_learning_rate=0))) # copy from progressive/utils.py due to the private visibility issue. def config_override(params, flags_obj): """Override ExperimentConfig according to flags.""" # Change runtime.tpu to the real tpu. params.override({'runtime': { 'tpu': flags_obj.tpu, }}) # Get the first level of override from `--config_file`.