# accuracy_top-1 : 81.52 accuracy_top-5 : 95.73
_base_ = [
    '../_base_/models/tnt_s_patch16_224.py',
    '../_base_/datasets/imagenet_bs32_pil_resize.py',
    '../_base_/default_runtime.py'
]

# dataset settings
data_preprocessor = dict(
    mean=[127.5, 127.5, 127.5],
    std=[127.5, 127.5, 127.5],
    # convert image from BGR to RGB
    to_rgb=True,
)

test_pipeline = [
    dict(type='LoadImageFromFile'),
    dict(
        type='ResizeEdge',
        scale=248,
        edge='short',
        backend='pillow',
        interpolation='bicubic'),
    dict(type='CenterCrop', crop_size=224),
    dict(type='PackInputs'),
]

train_dataloader = dict(batch_size=64)
val_dataloader = dict(dataset=dict(pipeline=test_pipeline))
test_dataloader = dict(dataset=dict(pipeline=test_pipeline))

# schedule settings
optim_wrapper = dict(optimizer=dict(type='AdamW', lr=1e-3, weight_decay=0.05))

param_scheduler = [
    # warm up learning rate scheduler
    dict(
        type='LinearLR',
        start_factor=1e-3,
        by_epoch=True,
        begin=0,
        end=5,
        # update by iter
        convert_to_iter_based=True),
    # main learning rate scheduler
    dict(type='CosineAnnealingLR', T_max=295, by_epoch=True, begin=5, end=300)
]

train_cfg = dict(by_epoch=True, max_epochs=300, val_interval=1)
val_cfg = dict()
test_cfg = dict()

# NOTE: `auto_scale_lr` is for automatically scaling LR
# based on the actual training batch size.
# base_batch_size = (16 GPUs) x (64 samples per GPU)
auto_scale_lr = dict(base_batch_size=1024)