from functools import partial from typing import Callable, Dict, List, Optional, Tuple, Union import torch.nn as nn from torch import Tensor from torch.nn import Module import colossalai.shardformer.layer as col_nn from ..modeling.bloom import BloomPipelineForwards, build_bloom_alibi_tensor_fn from .base_policy import ModulePolicyDescription, Policy, SubModuleReplacementDescription class BloomPolicy(Policy): def config_sanity_check(self): pass def preprocess(self): # reshape the embedding layer r""" Reshape the Embedding layer to make the embedding dimension divisible by world_size """ if self.shard_config.enable_tensor_parallelism: vocab_size = self.model.config.vocab_size world_size = self.shard_config.tensor_parallel_size if vocab_size % world_size != 0: new_vocab_size = vocab_size + world_size - vocab_size % world_size self.model.resize_token_embeddings(new_vocab_size) return self.model def module_policy(self): from transformers.models.bloom.modeling_bloom import BloomBlock, BloomModel policy = {} if self.shard_config.enable_tensor_parallelism: policy[BloomBlock] = ModulePolicyDescription(attribute_replacement={ "self_attention.hidden_size": self.model.config.hidden_size // self.shard_config.tensor_parallel_size, "self_attention.split_size": self.model.config.hidden_size // self.shard_config.tensor_parallel_size, "self_attention.num_heads": self.model.config.n_head // self.shard_config.tensor_parallel_size, }, sub_module_replacement=[ SubModuleReplacementDescription( suffix="self_attention.query_key_value", target_module=col_nn.Linear1D_Col, ), SubModuleReplacementDescription( suffix="self_attention.dense", target_module=col_nn.Linear1D_Row, ), SubModuleReplacementDescription( suffix="self_attention.attention_dropout", target_module=col_nn.DropoutForParallelInput, ), SubModuleReplacementDescription( suffix="mlp.dense_h_to_4h", target_module=col_nn.Linear1D_Col, ), SubModuleReplacementDescription( suffix="mlp.dense_4h_to_h", target_module=col_nn.Linear1D_Row, ), ]) policy[BloomModel] = ModulePolicyDescription( attribute_replacement={ "num_heads": self.model.config.n_head // self.shard_config.tensor_parallel_size, }, method_replacement={ "build_alibi_tensor": build_bloom_alibi_tensor_fn(self.shard_config.tensor_parallel_process_group) }, sub_module_replacement=[ SubModuleReplacementDescription( suffix="word_embeddings", target_module=col_nn.VocabParallelEmbedding1D, ) ]) # optimization configuration if self.shard_config.enable_fused_normalization: # handle bloom model self.append_or_create_submodule_replacement(description=[ SubModuleReplacementDescription( suffix="ln_f", target_module=col_nn.FusedLayerNorm, ), SubModuleReplacementDescription( suffix="word_embeddings_layernorm", target_module=col_nn.FusedLayerNorm, ) ], policy=policy, target_key=BloomModel) # handle bloom block self.append_or_create_submodule_replacement(description=[ SubModuleReplacementDescription( suffix="input_layernorm", target_module=col_nn.FusedLayerNorm, ), SubModuleReplacementDescription( suffix="post_attention_layernorm", target_module=col_nn.FusedLayerNorm, ) ], policy=policy, target_key=BloomBlock) return policy def postprocess(self): return self.model def set_pipeline_forward(self, model_cls: nn.Module, new_forward: Callable, policy: Dict) -> None: """If under pipeline parallel setting, replacing the original forward method of huggingface to customized forward method, and add this changing to policy.""" if self.pipeline_stage_manager: stage_manager = self.pipeline_stage_manager if self.model.__class__.__name__ == "BloomModel": module = self.model else: module = self.model.transformer layers_per_stage = Policy.distribute_layers(len(module.h), stage_manager.num_stages) stage_index = Policy.get_stage_index(layers_per_stage, stage_manager.stage) method_replacement = {'forward': partial(new_forward, stage_manager=stage_manager, stage_index=stage_index)} self.append_or_create_method_replacement(description=method_replacement, policy=policy, target_key=model_cls) return def get_held_layers(self) -> List[Module]: """Get pipeline layers for current stage.""" assert self.pipeline_stage_manager is not None if self.model.__class__.__name__ == 'BloomModel': module = self.model else: module = self.model.transformer stage_manager = self.pipeline_stage_manager held_layers = [] layers_per_stage = self.distribute_layers(len(module.h), stage_manager.num_stages) if stage_manager.is_first_stage(): held_layers.append(module.word_embeddings) held_layers.append(module.word_embeddings_layernorm) start_idx, end_idx = self.get_stage_index(layers_per_stage, stage_manager.stage) held_layers.extend(module.h[start_idx:end_idx]) if stage_manager.is_last_stage(): held_layers.append(module.ln_f) return held_layers class BloomModelPolicy(BloomPolicy): def __init__(self) -> None: super().__init__() def module_policy(self): policy = super().module_policy() from transformers.models.bloom.modeling_bloom import BloomModel if self.pipeline_stage_manager: self.set_pipeline_forward(model_cls=BloomModel, new_forward=BloomPipelineForwards.bloom_model_forward, policy=policy) return policy def get_held_layers(self) -> List[Module]: """ get pipeline layers for current stage """ held_layers = super().get_held_layers() return held_layers def get_shared_params(self) -> List[Dict[int, Tensor]]: '''no shared params in bloom model''' return [] class BloomForCausalLMPolicy(BloomPolicy): def module_policy(self): from transformers.models.bloom.modeling_bloom import BloomForCausalLM policy = super().module_policy() # handle tensor parallelism if self.shard_config.enable_tensor_parallelism: self.append_or_create_submodule_replacement(description=SubModuleReplacementDescription( suffix="lm_head", target_module=col_nn.Linear1D_Col, kwargs=dict(gather_output=True)), policy=policy, target_key=BloomForCausalLM) if self.pipeline_stage_manager: self.set_pipeline_forward(model_cls=BloomForCausalLM, new_forward=BloomPipelineForwards.bloom_for_causal_lm_forward, policy=policy) return policy def get_held_layers(self) -> List[Module]: """Get pipeline layers for current stage.""" stage_manager = self.pipeline_stage_manager held_layers = super().get_held_layers() if stage_manager.is_last_stage(): held_layers.append(self.model.lm_head) return held_layers def get_shared_params(self) -> List[Dict[int, Tensor]]: bloom_model = self.model if self.pipeline_stage_manager and self.pipeline_stage_manager.num_stages > 1: if id(bloom_model.transformer.word_embeddings.weight) == id(bloom_model.lm_head.weight): # tie weights return [{ 0: bloom_model.transformer.word_embeddings.weight, self.pipeline_stage_manager.num_stages - 1: bloom_model.lm_head.weight }] return [] class BloomForSequenceClassificationPolicy(BloomPolicy): def module_policy(self): from transformers.models.bloom.modeling_bloom import BloomForSequenceClassification policy = super().module_policy() # handle tensor parallelism if self.shard_config.enable_tensor_parallelism: self.append_or_create_submodule_replacement(description=SubModuleReplacementDescription( suffix="score", target_module=col_nn.Linear1D_Col, kwargs=dict(gather_output=True)), policy=policy, target_key=BloomForSequenceClassification) if self.pipeline_stage_manager: self.set_pipeline_forward(model_cls=BloomForSequenceClassification, new_forward=BloomPipelineForwards.bloom_for_sequence_classification_forward, policy=policy) return policy def get_held_layers(self) -> List[Module]: """Get pipeline layers for current stage.""" stage_manager = self.pipeline_stage_manager held_layers = super().get_held_layers() if stage_manager.is_last_stage(): held_layers.append(self.model.score) return held_layers def get_shared_params(self) -> List[Dict[int, Tensor]]: """No shared params in bloom for sequence classification model""" return [] class BloomForTokenClassificationPolicy(BloomPolicy): def module_policy(self): from transformers.models.bloom.modeling_bloom import BloomForTokenClassification policy = super().module_policy() # handle tensor parallelism if self.shard_config.enable_tensor_parallelism: self.append_or_create_submodule_replacement(description=[ SubModuleReplacementDescription(suffix="classifier", target_module=col_nn.Linear1D_Col, kwargs=dict(gather_output=True)), SubModuleReplacementDescription( suffix="dropout", target_module=col_nn.DropoutForReplicatedInput, ), ], policy=policy, target_key=BloomForTokenClassification) if self.pipeline_stage_manager: self.set_pipeline_forward(model_cls=BloomForTokenClassification, new_forward=BloomPipelineForwards.bloom_for_token_classification_forward, policy=policy) return policy def get_held_layers(self) -> List[Module]: """Get pipeline layers for current stage.""" stage_manager = self.pipeline_stage_manager held_layers = super().get_held_layers() if stage_manager.is_last_stage(): held_layers.append(self.model.dropout) held_layers.append(self.model.classifier) return held_layers def get_shared_params(self) -> List[Dict[int, Tensor]]: """No shared params in bloom for token classification model""" return [] class BloomForQuestionAnsweringPolicy(BloomPolicy): # No head sharding as the output features is only 2 def module_policy(self): from transformers.models.bloom.modeling_bloom import BloomForQuestionAnswering policy = super().module_policy() if self.pipeline_stage_manager: self.set_pipeline_forward(model_cls=BloomForQuestionAnswering, new_forward=BloomPipelineForwards.bloom_for_question_answering_forward, policy=policy) return policy def get_held_layers(self) -> List[Module]: """Get pipeline layers for current stage.""" held_layers = super().get_held_layers() stage_manager = self.pipeline_stage_manager if stage_manager.is_last_stage(): held_layers.append(self.model.qa_outputs) return held_layers def get_shared_params(self) -> List[Dict[int, Tensor]]: """No shared params in bloom for question answering model""" return []