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ft_curriculum_EPD_ddp.py
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ft_curriculum_EPD_ddp.py
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import copy
import numpy as np
import torch
import torch.nn as nn
import torch.distributed as dist
from torch.nn.parallel import DistributedDataParallel as DDP
from time import time
import wandb
from dynamics_training_loop import configure_epd_models, configure_val_dataset, configure_train_dataset_and_loader, \
epd_train_step, epd_train_step_with_checkpoint, prepare_training, validate_loop, to_device, \
configure_loss, configure_optimizers, dump_state, parse_args_and_config, configure_residual_stat
from utils.steps_scheduler import CurriculumSampler
from utils.training_utils import ema_update
import gc
from datetime import timedelta
def main(args, config):
assert torch.cuda.is_available(), "Training currently requires at least one GPU."
# retrieve specified gpu id from config
device_ids = config.device_ids
torch.backends.cudnn.deterministic = True
torch.set_float32_matmul_precision('high')
torch.backends.cuda.matmul.allow_tf32 = True
torch.backends.cudnn.allow_tf32 = True
# Setup DDP:
dist.init_process_group("nccl", timeout=timedelta(seconds=7200000),)
rank = dist.get_rank()
# visible_devices = os.environ['CUDA_VISIBLE_DEVICES']
# print(f"Visible devices: {visible_devices}")
device = rank % torch.cuda.device_count()
seed = args.global_seed * dist.get_world_size() + rank
torch.manual_seed(seed)
torch.cuda.set_device(device)
# print free memory on this device
# free_memory = torch.cuda.get_device_properties(device).total_memory - torch.cuda.memory_reserved(device)
print(f"Starting rank={rank}, seed={seed}, world_size={dist.get_world_size()}.")
assert config.training.global_batch_size % dist.get_world_size() == 0, f"Batch size must be divisible by world size."
# prepare wandb logging
if rank == 0:
wandb.init(project=config.project_name,
config=config)
logger, log_dir = prepare_training(args, config)
model = configure_epd_models(config) # train from scratch or ft
# load checkpoint
model.load_state_dict(torch.load(config.training.pretrained_checkpoint_path,
map_location=torch.device(device),
)['model'])
# create ema counterpart
model.to(device)
torch.cuda.empty_cache()
gc.collect()
if config.training.ema_checkpoint != 'none':
ema_model = copy.deepcopy(model)
ema_model.load_state_dict(torch.load(config.training.ema_checkpoint, map_location=torch.device(device))['model'])
ema_model.eval().requires_grad_(False)
if rank == 0:
print(f"Loaded EMA model from {config.training.ema_checkpoint}.")
torch.cuda.empty_cache()
else:
ema_model = copy.deepcopy(model).eval().requires_grad_(False)
if rank == 0:
print("Created EMA model from scratch.")
model_ddp = DDP(model, device_ids=[rank])
# compile model, usually much faster
if config.training.use_compile: # currently does not work with gradient checkpointing
model_ddp = torch.compile(model_ddp)
# for fine tune almost just use constant learning rate except the warmup
optim, sched = configure_optimizers(config, model_ddp)
global_step = 0
# load optimizer state if needed
if config.training.resume_from_checkpoint:
checkpoint = torch.load(config.training.resume_checkpoint_path, map_location=torch.device(device))
optim.load_state_dict(checkpoint['optimizer'])
sched.load_state_dict(checkpoint['scheduler'])
global_step = checkpoint['global_step']
if rank == 0:
print(f"Resumed optimizer state from checkpoint at global step {checkpoint['global_step']}.")
torch.cuda.empty_cache()
if rank == 0:
print('Building datasets...')
# construct curriculum sampler
curriculum_scheduler = CurriculumSampler(
values=config.training.curriculum_values,
milestone=config.training.curriculum_milestone
)
train_dataset, train_dataloader =\
configure_train_dataset_and_loader(config.training.curriculum_values[0]+1,
config.training.global_batch_size,
config) # initially just train one step
residual_normalizer = configure_residual_stat(config)
# to device
residual_normalizer = residual_normalizer.to(device)
valsteps = config.data.valsteps
if rank == 0:
val_dataset = configure_val_dataset(valsteps, config)
else:
val_dataset = None
training_iter = iter(train_dataloader)
max_steps = config.training.max_steps
if rank == 0:
logger.info(f"max_steps: {max_steps}")
logger.info("Starting training loop...")
# construct loss function
training_loss_module = configure_loss(config)
training_loss_module.to(device)
grad_post_proc = lambda x: nn.utils.clip_grad_norm_(model_ddp.parameters(),
config.training.max_grad_norm)
start_time = time()
while global_step < max_steps:
rollout_steps, has_changed = curriculum_scheduler.get_value(global_step)
if has_changed: # reconstruct the dataloader
del train_dataloader, train_dataset
# garbage collection
torch.cuda.empty_cache()
gc.collect()
train_dataset, train_dataloader = configure_train_dataset_and_loader(rollout_steps+1,
config.training.global_batch_size,
config)
training_iter = iter(train_dataloader)
if rank == 0:
logger.info(f"Rollout steps changed to {rollout_steps} at global step {global_step}.")
try:
batch = next(training_iter)
except StopIteration:
training_iter = iter(train_dataloader)
batch = next(training_iter)
# retrieve things from batch
batch = to_device(batch, device)
surface_in_feat, surface_target_feat, multi_level_in_feat, multi_level_target_feat, constants = batch
if rollout_steps > config.training.gradient_checkpointing_segment_size:
loss = \
epd_train_step_with_checkpoint(model_ddp, surface_in_feat, surface_target_feat,
multi_level_in_feat, multi_level_target_feat,
constants,
optim, sched, training_loss_module, grad_post_proc,
residual_normalizer,
config.training.gradient_checkpointing_segment_size)
else:
loss = \
epd_train_step(model_ddp, surface_in_feat, surface_target_feat,
multi_level_in_feat, multi_level_target_feat,
constants,
optim, sched, training_loss_module,
grad_post_proc,
residual_normalizer)
# update ema model
ema_update(ema_model, model_ddp, decay=config.training.ema_decay)
if global_step % config.training.ckpt_every == 0:
# only do this on rank zero
if rank == 0:
dump_state(model_ddp, optim, sched, global_step, log_dir)
dump_state(ema_model, optim, sched, global_step, log_dir, ema=True)
dist.barrier()
if global_step % config.training.validate_every == 0:
if rank == 0:
validate_loop(ema_model, config.data.val_timestamps,
logger, global_step, val_dataset,
config.training.val_batch_size, config, device)
dist.barrier()
global_step += 1
if rank == 0:
if global_step % config.training.print_every == 0:
torch.cuda.synchronize()
end_time = time()
steps_per_sec = config.training.print_every / (end_time - start_time)
print(
f' Step: {global_step}'
f' Pred Loss: {np.round(loss, 4)}' # this loss is not averaged across ranks
f' LR: {np.round(optim.param_groups[0]["lr"], 6)}'
f' Steps/sec: {np.round(steps_per_sec, 3)}'
f' ETA: {np.round((max_steps - global_step) / steps_per_sec / 3600, 3)}h'
f' Rollout steps: {rollout_steps}'
)
start_time = time()
wandb.log({
'loss': loss, # to match with previous experiments
'lr': optim.param_groups[0]['lr'],
'rollout_steps': rollout_steps
})
if rank == 0:
dump_state(model_ddp, optim, sched, global_step, log_dir)
dump_state(ema_model, optim, sched, global_step, log_dir, ema=True)
validate_loop(ema_model, config.data.val_timestamps,
logger, global_step, val_dataset,
config.training.val_batch_size, config, device)
dist.barrier()
logger.info('Training finished...')
wandb.finish()
dist.destroy_process_group()
if __name__ == "__main__":
args, config = parse_args_and_config()
main(args, config)