[Shardformer] Downstream bert (#3979)

* add dist dropout in model

* update docstring and bert policy with dropout

* refactor basepolicy and sharded, update bert

* update format

* update gpt2 policy

* update bert policy

* remove unused code

* update readme for new policy usage

* add downstream model of bert

* remove unused code

colossalai/shardformer/policies/autopolicy.py

@@ -10,11 +10,31 @@ def build_policies():
     """
     auto_policy_dict = {}
 
+    from transformers import BertModel
+
+    from .bert import BertModelPolicy
+    auto_policy_dict[BertModel] = BertModelPolicy
+
+    from transformers import BertForPreTraining
+
+    from .bert import BertForPretrainingPolicy
+    auto_policy_dict[BertForPreTraining] = BertForPretrainingPolicy
+
+    from transformers import BertLMHeadModel
+
+    from .bert import BertLMHeadModelPolicy
+    auto_policy_dict[BertLMHeadModel] = BertLMHeadModelPolicy
+
     from transformers import BertForMaskedLM
 
     from .bert import BertForMaskedLMPolicy
     auto_policy_dict[BertForMaskedLM] = BertForMaskedLMPolicy
 
+    from transformers import BertForNextSentencePrediction
+
+    from .bert import BertForNextSentencePredictionPolicy
+    auto_policy_dict[BertForNextSentencePrediction] = BertForNextSentencePredictionPolicy
+
     from transformers import BertForSequenceClassification
 
     from .bert import BertForSequenceClassificationPolicy
@@ -34,6 +54,11 @@ def build_policies():
     from .llama import LlamaForCausalLMPolicy
     auto_policy_dict[LlamaForCausalLM] = LlamaForCausalLMPolicy
 
+    from transformers import BertForMultipleChoice
+
+    from .bert import BertForMultipleChoicePolicy
+    auto_policy_dict[BertForMultipleChoice] = BertForMultipleChoicePolicy
+
     from transformers import GPT2Model
 
     from .gpt2 import GPT2Policy

colossalai/shardformer/policies/bert.py

@@ -35,12 +35,6 @@ class BertPolicy(Policy):
                     ]),
         }
 
-    @staticmethod
-    def binding_policy():
-        return {
-            "bert.embeddings.word_embeddings.weight": "cls.predictions.decoder.weight",
-        }
-
     @staticmethod
     def attn_in():
         return [
@@ -148,9 +142,53 @@ class BertPolicy(Policy):
             replace_layer=col_nn.VocabParallelEmbedding1D,
         )]
 
+    @staticmethod
+    def unembedding():
+        return [
+            Col_Layer(
+                suffix="decoder",
+                weight="weight",
+                bias="bias",
+                replace_layer=col_nn.Linear1D_Col,
+                gather_output=True,
+            )
+        ]
+
+
+# BertModel
+class BertModelPolicy(BertPolicy):
+
+    @staticmethod
+    def argument_policy(config, world_size):
+        return BertPolicy.argument_policy(config, world_size)
+
 
-from transformers import BertForMaskedLM
+# BertForPretraining
+class BertForPretrainingPolicy(BertPolicy):
 
+    @staticmethod
+    def argument_policy(config, world_size):
+        base_argument = BertPolicy.argument_policy(config, world_size)
+        argument = {
+            BertLMPredictionHead: Argument(attr_dict={}, param_funcs=[
+                BertPolicy.unembedding,
+            ]),
+        }
+        argument.update(base_argument)
+        return argument
+
+    @staticmethod
+    def inject_policy():
+        return None
+
+    @staticmethod
+    def binding_policy():
+        return {
+            "bert.embeddings.word_embeddings.weight": "cls.predictions.decoder.weight",
+        }
+
+
+# BertForMaskedLM
 from colossalai.shardformer.model.modeling_bert import BertForMaskedLM_
 
 
@@ -161,7 +199,7 @@ class BertForMaskedLMPolicy(BertPolicy):
         base_argument = BertPolicy.argument_policy(config, world_size)
         argument = {
             BertLMPredictionHead: Argument(attr_dict={}, param_funcs=[
-                BertForMaskedLMPolicy.unembedding,
+                BertPolicy.unembedding,
             ]),
         }
         argument.update(base_argument)
@@ -173,20 +211,56 @@ class BertForMaskedLMPolicy(BertPolicy):
         return None
 
     @staticmethod
-    def unembedding():
-        return [
-            Col_Layer(
-                suffix="decoder",
-                weight="weight",
-                bias="bias",
-                replace_layer=col_nn.Linear1D_Col,
-                gather_output=True,
-            )
-        ]
+    def binding_policy():
+        return {
+            "bert.embeddings.word_embeddings.weight": "cls.predictions.decoder.weight",
+        }
 
 
-class BertForSequenceClassificationPolicy(BertPolicy):
+# BertLMHeadModel
+class BertLMHeadModelPolicy(BertPolicy):
+
+    @staticmethod
+    def argument_policy(config, world_size):
+        base_argument = BertPolicy.argument_policy(config, world_size)
+        argument = {
+            BertLMPredictionHead: Argument(attr_dict={}, param_funcs=[
+                BertPolicy.unembedding,
+            ]),
+        }
+        argument.update(base_argument)
+        return argument
 
     @staticmethod
     def inject_policy():
         return None
+
+    @staticmethod
+    def binding_policy():
+        return {
+            "bert.embeddings.word_embeddings.weight": "cls.predictions.decoder.weight",
+        }
+
+
+# BertForNextSentencePrediction
+class BertForNextSentencePredictionPolicy(BertPolicy):
+
+    @staticmethod
+    def argument_policy(config, world_size):
+        return BertPolicy.argument_policy(config, world_size)
+
+
+# BertForSequenceClassification
+class BertForSequenceClassificationPolicy(BertPolicy):
+
+    @staticmethod
+    def argument_policy(config, world_size):
+        return BertPolicy.argument_policy(config, world_size)
+
+
+# BertForMultipleChoice
+class BertForMultipleChoicePolicy(BertPolicy):
+
+    @staticmethod
+    def argument_policy(config, world_size):
+        return BertPolicy.argument_policy(config, world_size)

colossalai/shardformer/shard/shard_config.py

@@ -13,6 +13,6 @@ class ShardConfig:
         world_size (int): The world size of the distributed process
         gather_output (bool): Whether to gather the output of the model of the last layer
     """
-    rank: int
-    world_size: int = 2
+    rank: int = None
+    world_size: int = None
     gather_output: bool = True

colossalai/shardformer/shard/sharder.py

@@ -276,6 +276,7 @@ def shard_model(model: nn.Module, shard_config: ShardConfig = None, policy: Poli
         shard_config (`ShardConfig`): the config for distribute information
         policy (`Policy`): the custom policy for sharding
     """
+    # TODO: init shard_config automatically
     sharder = ModelSharder(model=model, shard_config=shard_config, policy=policy)
     sharder.shard()
     return model

tests/test_shardformer/test_model/test_shard_bert.py

+import copy
 import os
-import random
 
 import pytest
 import torch
-from transformers import AutoTokenizer, BertConfig, BertForMaskedLM
+from transformers import (
+    AutoTokenizer,
+    BertConfig,
+    BertForMaskedLM,
+    BertForMultipleChoice,
+    BertForNextSentencePrediction,
+    BertForPreTraining,
+    BertForSequenceClassification,
+    BertLMHeadModel,
+    BertModel,
+)
 
 import colossalai
 from colossalai.logging import disable_existing_loggers
@@ -15,20 +25,21 @@ CONFIG = dict(parallel=dict(data=1, pipeline=1, tensor=dict(size=2, mode='1d')),
 tokenizer = AutoTokenizer.from_pretrained("bert-base-uncased")
 
 
-def build_model(rank, world_size):
+def build_model(rank, world_size, model):
     config = BertConfig.from_pretrained('bert-base-uncased')
     config.hidden_dropout_prob = 0
     config.attention_probs_dropout_prob = 0
 
-    org_model = BertForMaskedLM.from_pretrained('bert-base-uncased', config=config).to('cuda')
+    org_model = model(config=config)
+    org_model_forshard = copy.deepcopy(org_model)
 
+    org_model = org_model.to('cuda')
     shardconfig = ShardConfig(
         rank=rank,
         world_size=world_size,
         gather_output=True,
     )
-    sharded_model = shard_model(BertForMaskedLM.from_pretrained('bert-base-uncased', config=config),
-                                shardconfig).to('cuda')
+    sharded_model = shard_model(org_model_forshard, shardconfig).to('cuda')
 
     return org_model, sharded_model
 
@@ -85,12 +96,19 @@ def check_backward(org_model, sharded_model):
 def check_bert(rank, world_size, port):
     disable_existing_loggers()
     colossalai.launch(config=CONFIG, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
-
-    org_model, sharded_model = build_model(rank, world_size)
-    check_forward(org_model, sharded_model)
-    check_backward(org_model, sharded_model)
-
-    torch.cuda.empty_cache()
+    forward_list = [
+        BertModel, BertForPreTraining, BertForMaskedLM, BertLMHeadModel, BertForNextSentencePrediction,
+        BertForSequenceClassification
+    ]
+    backward_lsit = [BertForMaskedLM, BertLMHeadModel]
+
+    for model in forward_list:
+        org_model, sharded_model = build_model(rank, world_size, model)
+        check_forward(org_model, sharded_model)
+        if model in backward_lsit:
+            check_backward(org_model, sharded_model)
+
+        torch.cuda.empty_cache()
 
 
 @pytest.mark.dist