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engine_for_pretraining.py
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engine_for_pretraining.py
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import math
import sys
from typing import Iterable
import torch
import torch.nn as nn
from einops import rearrange
from timm.data.constants import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
import utils
def train_one_epoch(model: torch.nn.Module,
data_loader: Iterable,
optimizer: torch.optim.Optimizer,
device: torch.device,
epoch: int,
loss_scaler,
max_norm: float = 0,
patch_size: int = 16,
normlize_target: bool = True,
log_writer=None,
lr_scheduler=None,
start_steps=None,
lr_schedule_values=None,
wd_schedule_values=None):
model.train()
metric_logger = utils.MetricLogger(delimiter=" ")
metric_logger.add_meter(
'lr', utils.SmoothedValue(window_size=1, fmt='{value:.6f}'))
metric_logger.add_meter(
'min_lr', utils.SmoothedValue(window_size=1, fmt='{value:.6f}'))
header = 'Epoch: [{}]'.format(epoch)
print_freq = 10
loss_func = nn.MSELoss()
for step, batch in enumerate(
metric_logger.log_every(data_loader, print_freq, header)):
# assign learning rate & weight decay for each step
it = start_steps + step # global training iteration
if lr_schedule_values is not None or wd_schedule_values is not None:
for i, param_group in enumerate(optimizer.param_groups):
if lr_schedule_values is not None:
param_group["lr"] = lr_schedule_values[it] * param_group[
"lr_scale"]
if wd_schedule_values is not None and param_group[
"weight_decay"] > 0:
param_group["weight_decay"] = wd_schedule_values[it]
videos, bool_masked_pos = batch
videos = videos.to(device, non_blocking=True)
bool_masked_pos = bool_masked_pos.to(
device, non_blocking=True).flatten(1).to(torch.bool)
with torch.no_grad():
# calculate the predict label
mean = torch.as_tensor(IMAGENET_DEFAULT_MEAN).to(device)[None, :,
None,
None,
None]
std = torch.as_tensor(IMAGENET_DEFAULT_STD).to(device)[None, :,
None, None,
None]
unnorm_videos = videos * std + mean # in [0, 1]
if normlize_target:
videos_squeeze = rearrange(
unnorm_videos,
'b c (t p0) (h p1) (w p2) -> b (t h w) (p0 p1 p2) c',
p0=2,
p1=patch_size,
p2=patch_size)
videos_norm = (videos_squeeze - videos_squeeze.mean(
dim=-2, keepdim=True)) / (videos_squeeze.var(
dim=-2, unbiased=True, keepdim=True).sqrt() + 1e-6)
# we find that the mean is about 0.48 and standard deviation is about 0.08.
videos_patch = rearrange(videos_norm, 'b n p c -> b n (p c)')
else:
videos_patch = rearrange(
unnorm_videos,
'b c (t p0) (h p1) (w p2) -> b (t h w) (p0 p1 p2 c)',
p0=2,
p1=patch_size,
p2=patch_size)
B, _, C = videos_patch.shape
patch_number = videos_patch.shape[1]
if bool_masked_pos.shape[1] != patch_number:
labels = videos_patch[
bool_masked_pos.reshape(
B, -1, patch_number)[:, 1, :]].reshape(B, -1, C)
else:
labels = videos_patch[bool_masked_pos].reshape(B, -1, C)
loss_kl = None
with torch.cuda.amp.autocast():
#import pdb; pdb.set_trace()
outputs = model(videos, bool_masked_pos)
if isinstance(outputs, tuple):
outputs, loss_kl = outputs
loss_mse = loss_func(input=outputs, target=labels)
if loss_kl is not None:
loss_all = loss_mse + 0.1 * loss_kl
else:
loss_all = loss_mse
loss_value = loss_all.item()
if not math.isfinite(loss_value):
print("Loss is {}, stopping training".format(loss_value))
sys.exit(1)
optimizer.zero_grad()
# this attribute is added by timm on one optimizer (adahessian)
is_second_order = hasattr(
optimizer, 'is_second_order') and optimizer.is_second_order
grad_norm = loss_scaler(loss_all,
optimizer,
clip_grad=max_norm,
parameters=model.parameters(),
create_graph=is_second_order)
loss_scale_value = loss_scaler.state_dict()["scale"]
torch.cuda.synchronize()
metric_logger.update(loss=loss_value)
metric_logger.update(loss_scale=loss_scale_value)
if loss_kl is not None:
metric_logger.update(loss_mse=loss_mse.item())
metric_logger.update(loss_kl=loss_kl.item())
min_lr = 10.
max_lr = 0.
for group in optimizer.param_groups:
min_lr = min(min_lr, group["lr"])
max_lr = max(max_lr, group["lr"])
metric_logger.update(lr=max_lr)
metric_logger.update(min_lr=min_lr)
weight_decay_value = None
for group in optimizer.param_groups:
if group["weight_decay"] > 0:
weight_decay_value = group["weight_decay"]
metric_logger.update(weight_decay=weight_decay_value)
metric_logger.update(grad_norm=grad_norm)
if log_writer is not None:
log_writer.update(loss=loss_value, head="loss")
if loss_kl is not None:
log_writer.update(loss=loss_mse.item(), head="loss_mse")
log_writer.update(loss=loss_kl.item(), head="loss_kl")
log_writer.update(loss_scale=loss_scale_value, head="opt")
log_writer.update(lr=max_lr, head="opt")
log_writer.update(min_lr=min_lr, head="opt")
log_writer.update(weight_decay=weight_decay_value, head="opt")
log_writer.update(grad_norm=grad_norm, head="opt")
log_writer.set_step()
if lr_scheduler is not None:
lr_scheduler.step_update(start_steps + step)
# gather the stats from all processes
metric_logger.synchronize_between_processes()
print("Averaged stats:", metric_logger)
return {k: meter.global_avg for k, meter in metric_logger.meters.items()}