mirror of https://github.com/hpcaitech/ColossalAI
39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
import copy
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from colossalai.shardformer import ShardConfig, ShardFormer
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def build_model(world_size, model_fn):
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# create new model
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org_model = model_fn().cuda()
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# shard model
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shard_config = ShardConfig(tensor_parallel_size=world_size)
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model_copy = copy.deepcopy(org_model)
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shard_former = ShardFormer(shard_config=shard_config)
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shard_former.init_distributed()
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sharded_model = shard_former.shard_model(model_copy)
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return org_model, sharded_model
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def run_forward(original_model, sharded_model, data_gen_fn, output_transform_fn, loss_fn):
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# prepare input
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data = data_gen_fn()
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data = {k: v.cuda() for k, v in data.items()}
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# switch to train mode
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original_model.train()
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sharded_model.train()
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# run forward
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org_output = original_model(**data)
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org_output = output_transform_fn(org_output)
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org_loss = loss_fn(org_output)
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shard_output = sharded_model(**data)
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shard_output = output_transform_fn(shard_output)
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shard_loss = loss_fn(shard_output)
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return org_output, org_loss, shard_output, shard_loss
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