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92 lines
3.5 KiB
92 lines
3.5 KiB
import os
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import tempfile
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from contextlib import nullcontext
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import pytest
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import torch
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import torch.distributed as dist
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from coati.models.gpt import GPTActor
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from coati.models.utils import calc_action_log_probs
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from coati.trainer.strategies import DDPStrategy, GeminiStrategy, LowLevelZeroStrategy, Strategy
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from transformers.models.gpt2.configuration_gpt2 import GPT2Config
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from colossalai.nn.optimizer import HybridAdam
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from colossalai.testing import rerun_if_address_is_in_use, spawn
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GPT_CONFIG = GPT2Config(n_embd=128, n_layer=4, n_head=4)
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def get_data(batch_size: int, seq_len: int = 10) -> dict:
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input_ids = torch.randint(0, 50257, (batch_size, seq_len), device="cuda")
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attention_mask = torch.ones_like(input_ids)
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return dict(input_ids=input_ids, attention_mask=attention_mask)
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def train_step(strategy: Strategy, actor: GPTActor, actor_optim: HybridAdam, batch_size: int = 8):
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data = get_data(batch_size)
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action_mask = torch.ones_like(data["attention_mask"], dtype=torch.bool)
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actor_output = actor(data["input_ids"], data["attention_mask"])
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action_log_probs = calc_action_log_probs(actor_output, data["input_ids"], action_mask.size(1))
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loss = action_log_probs.sum()
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strategy.backward(loss, actor, actor_optim)
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strategy.optimizer_step(actor_optim)
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def run_test_checkpoint(strategy_name: str, shard: bool):
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if strategy_name == "ddp":
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strategy = DDPStrategy()
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elif strategy_name == "colossalai_gemini":
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strategy = GeminiStrategy(placement_policy="cuda", initial_scale=2**5)
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elif strategy_name == "colossalai_zero2":
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strategy = LowLevelZeroStrategy(stage=2, placement_policy="cuda")
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else:
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raise ValueError(f"Unsupported strategy '{strategy_name}'")
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with strategy.model_init_context():
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actor = GPTActor(config=GPT_CONFIG).cuda()
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actor_optim = HybridAdam(actor.parameters())
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actor, actor_optim = strategy.prepare((actor, actor_optim))
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train_step(strategy, actor, actor_optim)
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ctx = tempfile.TemporaryDirectory() if dist.get_rank() == 0 else nullcontext()
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with ctx as dirname:
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rank0_dirname = [dirname]
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dist.broadcast_object_list(rank0_dirname)
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rank0_dirname = rank0_dirname[0]
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model_path = os.path.join(rank0_dirname, "model" if shard else f"model.pt")
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strategy.save_model(actor, model_path, only_rank0=not shard)
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optim_path = os.path.join(rank0_dirname, "optim" if shard else "optim.pt")
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strategy.save_optimizer(actor_optim, optim_path, only_rank0=not shard)
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dist.barrier()
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strategy.load_model(actor, model_path, strict=False)
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strategy.load_optimizer(actor_optim, optim_path)
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dist.barrier()
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train_step(strategy, actor, actor_optim)
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def run_dist(rank: int, world_size: int, port: int, strategy_name: str, shard: bool):
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os.environ["RANK"] = str(rank)
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os.environ["LOCAL_RANK"] = str(rank)
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os.environ["WORLD_SIZE"] = str(world_size)
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os.environ["MASTER_ADDR"] = "localhost"
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os.environ["MASTER_PORT"] = str(port)
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run_test_checkpoint(strategy_name, shard)
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@pytest.mark.dist
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@pytest.mark.parametrize("world_size", [4])
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@pytest.mark.parametrize("strategy_name", ["ddp", "colossalai_gemini", "colossalai_zero2"])
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@pytest.mark.parametrize("shard", [False, True])
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@rerun_if_address_is_in_use()
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def test_checkpoint(world_size: int, strategy_name: str, shard: bool):
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spawn(run_dist, world_size, strategy_name=strategy_name, shard=shard)
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if __name__ == "__main__":
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test_checkpoint(2, "colossalai_gemini", shard=False)
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