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# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
"""Pretrain VIT"""
import torch
import torch.nn.functional as F
from functools import partial
from megatron import get_args, get_timers, print_rank_0, print_rank_last
from megatron.core.enums import ModelType
from megatron.data.vit_dataset import build_train_valid_datasets
from megatron.model.vision.inpainting import VitInpaintingModel
from megatron.model.vision.inpainting import MitInpaintingModel
from megatron.training import pretrain
from megatron.utils import average_losses_across_data_parallel_group
from tasks.vision.metrics import SSIM, PSNR
from megatron.arguments import core_transformer_config_from_args
def model_provider(pre_process=True, post_process=True):
"""Build the model."""
args = get_args()
config = core_transformer_config_from_args(args)
if args.vision_backbone_type == 'vit':
model = VitInpaintingModel(config,
pre_process=pre_process,
post_process=post_process)
elif args.vision_backbone_type == 'mit':
model = MitInpaintingModel(pre_process=pre_process,
post_process=post_process)
else:
raise Exception('{} vision backbone is not supported.'.format(
args.vision_backbone_type))
return model
def get_batch(data_iterator):
"""Build the batch."""
data = next(data_iterator)
# only data parallelism; no need for broadcast
images = data[0][0].cuda()
masks = data[0][1].cuda()
return images, masks
def loss_func(images, masks, masked_images, outputs, collect_data=False):
outputs = outputs.contiguous().float()
masks_flip = 1-masks
flip_masked_outputs = outputs.masked_fill(masks_flip.bool(), 0)
flip_masked_images = images.masked_fill(masks_flip.bool(), 0)
ssim_fun = SSIM()
psnr_fun = PSNR()
if not collect_data:
mask_count = torch.count_nonzero(masks)
loss = F.mse_loss(
flip_masked_outputs,
flip_masked_images.float(),
reduction="sum"
)
loss = loss/mask_count
ssim = ssim_fun(flip_masked_outputs, flip_masked_images.float())
psnr = psnr_fun(flip_masked_outputs, flip_masked_images.float())
averaged_loss = average_losses_across_data_parallel_group(
[loss, psnr, ssim]
)
return loss, {"loss": averaged_loss[0],
"psnr": averaged_loss[1],
'ssim': averaged_loss[2]}
else:
synth_images = masked_images.float() + flip_masked_outputs
ssim = ssim_fun(synth_images, images.float())
psnr = psnr_fun(synth_images, images.float())
return torch.cat((images, masked_images, synth_images), dim=2), ssim, psnr
def forward_step(data_iterator, model):
"""Forward step."""
timers = get_timers()
# Get the batch.
timers("batch-generator", log_level=2).start()
(
images,
masks,
) = get_batch(data_iterator)
timers("batch-generator").stop()
masked_images = images.masked_fill(masks.bool(), 0)
outputs = model(masked_images)
# Forward mode
return outputs, partial(loss_func, images, masks, masked_images)
def process_non_loss_data(data, iteration, writer):
psnr_sum = 0
ssim_sum = 0
for (output_tb, ssim, psnr) in data:
output_tb[output_tb < 0] = 0
output_tb[output_tb > 1] = 1
writer.add_images("gt-input-output-vald", output_tb,
global_step=iteration, walltime=None,
dataformats='NCHW')
psnr_sum = psnr_sum + psnr.item()
ssim_sum = ssim_sum + ssim.item()
psnr = psnr_sum/len(data)
ssim = ssim_sum/len(data)
writer.add_scalar('PSNR generate value-validation', psnr, iteration)
writer.add_scalar('SSIM generate value-validation', ssim, iteration)
def train_valid_test_datasets_provider(train_val_test_num_samples):
"""Build train, valid, and test datasets."""
args = get_args()
print_rank_0(
"> building train, validation, and test datasets " "for VIT ..."
)
train_ds, valid_ds = build_train_valid_datasets(
data_path=args.data_path,
image_size=(args.img_h, args.img_w)
)
print_rank_0("> finished creating VIT datasets ...")
return train_ds, valid_ds, None
if __name__ == "__main__":
pretrain(
train_valid_test_datasets_provider,
model_provider,
ModelType.encoder_or_decoder,
forward_step,
process_non_loss_data,
args_defaults={'dataloader_type': 'cyclic', 'vision_pretraining': True}
)
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