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train.py
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train.py
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# coding=utf-8
from __future__ import absolute_import, division, print_function
import warnings
warnings.simplefilter(action='ignore', category=FutureWarning)
import logging
import argparse
import os
import random
import numpy as np
from datetime import timedelta
import torch
import torch.distributed as dist
from tqdm import tqdm
from torch.utils.tensorboard import SummaryWriter
import torch.multiprocessing as mp
from torch.nn.parallel import DistributedDataParallel as DDP
from utils import HParam
from ceit import CeiT
from utils import WarmupLinearSchedule, WarmupCosineSchedule
from data_utils import get_loader
from utils import get_world_size, get_rank
logger = logging.getLogger(__name__)
class AverageMeter(object):
"""Computes and stores the average and current value"""
def __init__(self):
self.reset()
def reset(self):
self.val = 0
self.avg = 0
self.sum = 0
self.count = 0
def update(self, val, n=1):
self.val = val
self.sum += val * n
self.count += n
self.avg = self.sum / self.count
def simple_accuracy(preds, labels):
return (preds == labels).mean()
def save_model(name, outdir, model):
model_to_save = model.module if hasattr(model, 'module') else model
model_checkpoint = os.path.join(outdir, "%s_checkpoint.pyt" % name)
torch.save(model_to_save.state_dict(), model_checkpoint)
logger.info("Saved model checkpoint to [DIR: %s]", outdir)
def count_parameters(model):
params = sum(p.numel() for p in model.parameters() if p.requires_grad)
return params/1000000
def set_seed(hp):
random.seed(hp.train.seed)
np.random.seed(hp.train.seed)
torch.manual_seed(hp.train.seed)
if hp.train.ngpu > 0:
torch.cuda.manual_seed_all(hp.train.seed)
def valid(device, local_rank, hp, model, writer, test_loader, global_step):
# Validation!
eval_losses = AverageMeter()
logger.info("***** Running Validation *****")
logger.info(" Num steps = %d", len(test_loader))
logger.info(" Batch size = %d", hp.train.valid_batch)
model.eval()
all_preds, all_label = [], []
epoch_iterator = tqdm(test_loader,
desc="Validating... (loss=X.X)",
bar_format="{l_bar}{r_bar}",
dynamic_ncols=True,
disable=local_rank not in [-1, 0])
loss_fct = torch.nn.CrossEntropyLoss()
for step, batch in enumerate(epoch_iterator):
batch = tuple(t.to(device) for t in batch)
x, y = batch
with torch.no_grad():
logits = model(x)
eval_loss = loss_fct(logits, y)
eval_losses.update(eval_loss.item())
preds = torch.argmax(logits, dim=-1)
if len(all_preds) == 0:
all_preds.append(preds.detach().cpu().numpy())
all_label.append(y.detach().cpu().numpy())
else:
all_preds[0] = np.append(
all_preds[0], preds.detach().cpu().numpy(), axis=0
)
all_label[0] = np.append(
all_label[0], y.detach().cpu().numpy(), axis=0
)
epoch_iterator.set_description("Validating... (loss=%2.5f)" % eval_losses.val)
all_preds, all_label = all_preds[0], all_label[0]
accuracy = simple_accuracy(all_preds, all_label)
logger.info("\n")
logger.info("Validation Results")
logger.info("Global Steps: %d" % global_step)
logger.info("Valid Loss: %2.5f" % eval_losses.avg)
logger.info("Valid Accuracy: %2.5f" % accuracy)
writer.add_scalar("test/accuracy", scalar_value=accuracy, global_step=global_step)
return accuracy
def train(local_rank, args, hp, model):
if hp.train.ngpu > 1:
dist.init_process_group(backend="nccl", init_method="tcp://localhost:54321",
world_size=hp.train.ngpu, rank=local_rank)
torch.cuda.manual_seed(hp.train.seed)
device = torch.device('cuda:{:d}'.format(local_rank))
model = model.to(device)
""" Train the model """
if local_rank in [-1, 0]:
os.makedirs(hp.data.outdir, exist_ok=True)
writer = SummaryWriter(log_dir=os.path.join("logs", args.name))
print("Loading dataset :")
hp.train.batch = hp.train.batch // hp.train.accum_grad
# Prepare dataset
train_loader, test_loader = get_loader(local_rank, hp)
# Prepare optimizer and scheduler
optimizer = torch.optim.AdamW(model.parameters(), hp.train.lr, betas=[0.8, 0.99], weight_decay=0.05)
t_total = hp.train.num_steps
if hp.train.decay_type == "cosine":
scheduler = WarmupCosineSchedule(optimizer, warmup_steps=hp.train.warmup_steps, t_total=t_total)
else:
scheduler = WarmupLinearSchedule(optimizer, warmup_steps=hp.train.warmup_steps, t_total=t_total)
# Distributed training
if hp.train.ngpu > 1:
model = DDP(model, device_ids=[local_rank])
# Train!
logger.info("***** Running training *****")
logger.info(" Total optimization steps = %d", hp.train.num_steps)
logger.info(" Instantaneous batch size per GPU = %d", hp.train.batch)
logger.info(" Total train batch size (w. parallel, distributed & accumulation) = %d",
hp.train.batch * hp.train.accum_grad * (
hp.train.ngpu if local_rank != -1 else 1))
logger.info(" Gradient Accumulation steps = %d", hp.train.accum_grad)
model.zero_grad()
set_seed(hp) # Added here for reproducibility (even between python 2 and 3)
losses = AverageMeter()
global_step, best_acc = 0, 0
loss_fct = torch.nn.CrossEntropyLoss()
while True:
model.train()
epoch_iterator = tqdm(train_loader,
desc="Training (X / X Steps) (loss=X.X)",
bar_format="{l_bar}{r_bar}",
dynamic_ncols=True,
disable=local_rank not in [-1, 0])
for step, batch in enumerate(epoch_iterator):
batch = tuple(t.to(device) for t in batch)
x, y = batch
logits = model(x)
loss = loss_fct(logits.view(-1, hp.model.num_classes), y.view(-1))
if hp.train.accum_grad > 1:
loss = loss / hp.train.accum_grad
loss.backward()
if (step + 1) % hp.train.accum_grad == 0:
losses.update(loss.item()*hp.train.accum_grad)
torch.nn.utils.clip_grad_norm_(model.parameters(), hp.train.grad_clip)
optimizer.step()
scheduler.step()
optimizer.zero_grad()
global_step += 1
epoch_iterator.set_description(
"Training (%d / %d Steps) (loss=%2.5f)" % (global_step, t_total, losses.val)
)
if local_rank in [-1, 0]:
writer.add_scalar("train/loss", scalar_value=losses.val, global_step=global_step)
writer.add_scalar("train/lr", scalar_value=scheduler.get_lr()[0], global_step=global_step)
if global_step % hp.train.valid_step == 0 and local_rank in [-1, 0]:
accuracy = valid(device, local_rank, hp, model, writer, test_loader, global_step)
if best_acc < accuracy:
save_model(args.name, hp.data.outdir, model)
best_acc = accuracy
model.train()
if global_step % t_total == 0:
break
losses.reset()
if global_step % t_total == 0:
break
if local_rank in [-1, 0]:
writer.close()
logger.info("Best Accuracy: \t%f" % best_acc)
logger.info("End Training!")
def main():
parser = argparse.ArgumentParser()
# Required parameters
parser.add_argument('-c', '--config', type=str, required=True,
help="yaml file for configuration")
parser.add_argument('-p', '--checkpoint_path', type=str, default=None,
help="path of checkpoint pt file to resume training")
parser.add_argument("--name", required=True,
help="Name of this run. Used for monitoring.")
args = parser.parse_args()
hp = HParam(args.config)
with open(args.config, 'r') as f:
hp_str = ''.join(f.readlines())
# Setup CUDA, GPU & distributed training
if hp.train.ngpu > 1:
torch.cuda.manual_seed(hp.train.seed)
hp.train.ngpu = torch.cuda.device_count()
hp.train.batch = int(hp.train.batch / hp.train.ngpu)
print('Batch size per GPU :', hp.train.batch)
# Set seed
set_seed(hp)
# Model & Tokenizer Setup
model = CeiT(image_size = hp.data.image_size, patch_size = hp.model.patch_size, num_classes = hp.model.num_classes,
dim = hp.model.dim, depth = hp.model.depth, heads = hp.model.heads, pool = hp.model.pool,
in_channels = hp.model.in_channels, out_channels = hp.model.out_channels, with_lca=hp.model.with_lca)
num_params = count_parameters(model)
logger.info("Training parameters %s", args)
logger.info("Total Parameter: \t%2.1fM" % num_params)
print(num_params)
# Training
#train(args, hp, model)
if hp.train.ngpu > 1:
mp.spawn(train, nprocs=hp.train.ngpu, args=(args, hp, model,))
else:
train(0, args, hp, model)
if __name__ == "__main__":
main()