mirror of https://github.com/hpcaitech/ColossalAI
242 lines
8.3 KiB
Python
242 lines
8.3 KiB
Python
from functools import partial
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from time import time
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import psutil
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import torch
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import torch.nn as nn
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from packaging import version
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import colossalai
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from colossalai.logging import disable_existing_loggers, get_dist_logger
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from colossalai.nn.optimizer import HybridAdam
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from colossalai.nn.parallel import ZeroDDP
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from colossalai.tensor import ColoParameter, ComputePattern, ComputeSpec, ProcessGroup, ShardSpec
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from colossalai.utils import get_current_device
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from colossalai.utils.model.colo_init_context import ColoInitContext
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from colossalai.zero import ZeroOptimizer
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from transformers import GPT2Config, GPT2LMHeadModel
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def parse_args():
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parser = colossalai.get_default_parser()
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parser.add_argument(
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"--tp_degree",
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type=int,
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default=1,
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help="Tensor Parallelism Degree.",
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)
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parser.add_argument(
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"--placement",
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type=str,
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default='cpu',
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help="Placement Policy for Gemini.",
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)
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args = parser.parse_args()
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return args
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## Parameter Sharding Strategies for Tensor Parallelism
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def split_param_single_dim_tp1d(dim: int, param: ColoParameter, pg: ProcessGroup):
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spec = (ShardSpec([dim], [pg.tp_world_size()]), ComputeSpec(ComputePattern.TP1D))
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if param.process_group.tp_world_size() == 1:
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param.set_process_group(pg)
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param.set_tensor_spec(*spec)
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def split_param_row_tp1d(param: ColoParameter, pg: ProcessGroup):
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split_param_single_dim_tp1d(0, param, pg)
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def split_param_col_tp1d(param: ColoParameter, pg: ProcessGroup):
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split_param_single_dim_tp1d(-1, param, pg)
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## Define the Model and Loss Based on Huggingface transformers GPT2LMHeadModel
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class GPTLMModel(nn.Module):
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def __init__(self,
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hidden_size=768,
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num_layers=12,
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num_attention_heads=12,
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max_seq_len=1024,
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vocab_size=50257,
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checkpoint=False):
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super().__init__()
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self.checkpoint = checkpoint
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self.model = GPT2LMHeadModel(
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GPT2Config(n_embd=hidden_size,
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n_layer=num_layers,
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n_head=num_attention_heads,
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n_positions=max_seq_len,
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n_ctx=max_seq_len,
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vocab_size=vocab_size))
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if checkpoint:
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self.model.gradient_checkpointing_enable()
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def forward(self, input_ids, attention_mask):
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# Only return lm_logits
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return self.model(input_ids=input_ids, attention_mask=attention_mask, use_cache=not self.checkpoint)[0]
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class GPTLMLoss(nn.Module):
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def __init__(self):
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super().__init__()
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self.loss_fn = nn.CrossEntropyLoss()
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def forward(self, logits, labels):
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shift_logits = logits[..., :-1, :].contiguous()
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shift_labels = labels[..., 1:].contiguous()
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# Flatten the tokens
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return self.loss_fn(shift_logits.view(-1, shift_logits.size(-1)), shift_labels.view(-1))
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## Randomly Generated Data
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def get_data(batch_size, seq_len, vocab_size):
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input_ids = torch.randint(0, vocab_size, (batch_size, seq_len), device=torch.cuda.current_device())
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attention_mask = torch.ones_like(input_ids)
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return input_ids, attention_mask
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def gpt2_medium(checkpoint=False):
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return GPTLMModel(hidden_size=1024, num_layers=24, num_attention_heads=16, checkpoint=checkpoint)
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def gpt2_xl(checkpoint=True):
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return GPTLMModel(hidden_size=1600, num_layers=48, num_attention_heads=32, checkpoint=checkpoint)
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def gpt2_10b(checkpoint=True):
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return GPTLMModel(hidden_size=4096, num_layers=50, num_attention_heads=16, checkpoint=checkpoint)
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def get_cpu_mem():
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return psutil.Process().memory_info().rss / 1024**2
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def get_gpu_mem():
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return torch.cuda.memory_allocated() / 1024**2
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def get_mem_info(prefix=''):
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return f'{prefix}GPU memory usage: {get_gpu_mem():.2f} MB, CPU memory usage: {get_cpu_mem():.2f} MB'
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def get_tflops(model_numel, batch_size, seq_len, step_time):
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return model_numel * batch_size * seq_len * 8 / 1e12 / (step_time + 1e-12)
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# Tensor Parallel
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def tensor_parallelize(model: torch.nn.Module, pg: ProcessGroup):
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"""tensor_parallelize
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Sharding the Model Parameters.
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Args:
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model (torch.nn.Module): a torch module to be sharded
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"""
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for mn, module in model.named_modules():
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for pn, param in module.named_parameters(recurse=False):
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# set process group for all parameters
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param.set_process_group(pg)
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if 'mlp.c_fc' in mn:
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if 'weight' in pn or 'bias' in pn:
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split_param_col_tp1d(param, pg) # colmn slice
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# keep the shape of the output from c_fc
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param.compute_spec.set_output_replicate(False)
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elif 'mlp.c_proj' in mn:
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if 'weight' in pn:
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split_param_row_tp1d(param, pg) # row slice
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elif 'wte' in mn or 'wpe' in mn:
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split_param_col_tp1d(param, pg) # colmn slice
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elif 'c_attn' in mn or 'c_proj' in mn:
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split_param_col_tp1d(param, pg) # colmn slice
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# Gemini + ZeRO DDP
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def gemini_zero_dpp(model: torch.nn.Module, pg: ProcessGroup, placememt_policy: str = "auto"):
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cai_version = colossalai.__version__
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if version.parse(cai_version) > version.parse("0.1.10"):
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from colossalai.nn.parallel import GeminiDDP
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model = GeminiDDP(model,
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device=get_current_device(),
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placement_policy=placememt_policy,
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pin_memory=True,
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search_range_mb=32)
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elif version.parse(cai_version) <= version.parse("0.1.10") and version.parse(cai_version) >= version.parse("0.1.9"):
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from colossalai.gemini import ChunkManager, GeminiManager
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chunk_size = ChunkManager.search_chunk_size(model, 64 * 1024**2, 32)
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gemini_manager = GeminiManager(placememt_policy, chunk_manager)
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chunk_manager = ChunkManager(chunk_size,
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pg,
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enable_distributed_storage=True,
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init_device=GeminiManager.get_default_device(placememt_policy))
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model = ZeroDDP(model, gemini_manager)
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else:
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raise NotImplemented(f"CAI version {cai_version} is not supported")
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return model
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def main():
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args = parse_args()
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BATCH_SIZE = 8
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SEQ_LEN = 1024
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VOCAB_SIZE = 50257
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NUM_STEPS = 10
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disable_existing_loggers()
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colossalai.launch_from_torch(config={})
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pg = ProcessGroup(tp_degree=args.tp_degree)
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logger = get_dist_logger()
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logger.info(get_mem_info(), ranks=[0])
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# build GPT model
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with ColoInitContext(device=get_current_device()):
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model = gpt2_medium(checkpoint=True)
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numel = sum([p.numel() for p in model.parameters()])
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logger.info(f'Model numel: {numel}', ranks=[0])
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get_tflops_func = partial(get_tflops, numel, BATCH_SIZE, SEQ_LEN)
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# Tensor Parallelism (TP)
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tensor_parallelize(model, pg)
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# Gemini + ZeRO DP, Note it must be used after TP
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model = gemini_zero_dpp(model, pg, args.placement)
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logger.info(get_mem_info(prefix='After init model, '), ranks=[0])
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# build criterion
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criterion = GPTLMLoss()
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# build optimizer
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optimizer = HybridAdam(model.parameters(), lr=1e-3)
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optimizer = ZeroOptimizer(optimizer, model, initial_scale=2**5)
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logger.info(get_mem_info(prefix='After init optim, '), ranks=[0])
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torch.cuda.synchronize()
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model.train()
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for n in range(NUM_STEPS):
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# we just use randomly generated data here
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input_ids, attn_mask = get_data(BATCH_SIZE, SEQ_LEN, VOCAB_SIZE)
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optimizer.zero_grad()
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start = time()
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outputs = model(input_ids, attn_mask)
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loss = criterion(outputs, input_ids)
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logger.info(get_mem_info(prefix=f'[{n+1}/{NUM_STEPS}] Forward '), ranks=[0])
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optimizer.backward(loss)
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logger.info(get_mem_info(prefix=f'[{n+1}/{NUM_STEPS}] Backward '), ranks=[0])
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optimizer.step()
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logger.info(get_mem_info(prefix=f'[{n+1}/{NUM_STEPS}] Optimizer step '), ranks=[0])
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step_time = time() - start
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logger.info(
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f'[{n+1}/{NUM_STEPS}] Loss:{loss.item():.3f}, Step time: {step_time:.3f}s, TFLOPS: {get_tflops_func(step_time):.3f}',
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ranks=[0])
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torch.cuda.synchronize()
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if __name__ == '__main__':
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main()
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