vit-base-p16_8xb2048-linear-coslr-100e_in1k.py

_base_ = [
    '../../_base_/datasets/imagenet_bs32_pil_resize.py',
    '../../_base_/schedules/imagenet_bs1024_adamw_swin.py',
    '../../_base_/default_runtime.py'
]

train_dataloader = dict(batch_size=2048, drop_last=True)
val_dataloader = dict(drop_last=False)
test_dataloader = dict(drop_last=False)

# model settings
model = dict(
    type='ImageClassifier',
    backbone=dict(
        type='VisionTransformer',
        arch='base',
        img_size=224,
        patch_size=16,
        frozen_stages=12,
        out_type='cls_token',
        final_norm=True,
        init_cfg=dict(type='Pretrained', checkpoint='', prefix='backbone.')),
    neck=dict(type='ClsBatchNormNeck', input_features=768),
    head=dict(
        type='VisionTransformerClsHead',
        num_classes=1000,
        in_channels=768,
        loss=dict(type='CrossEntropyLoss'),
        init_cfg=[dict(type='TruncNormal', layer='Linear', std=0.01)]),
    data_preprocessor=dict(
        num_classes=1000,
        mean=[123.675, 116.28, 103.53],
        std=[58.395, 57.12, 57.375],
        to_rgb=True,
    ))

# optimizer
optim_wrapper = dict(
    _delete_=True,
    type='AmpOptimWrapper',
    optimizer=dict(type='LARS', lr=3.2, weight_decay=0.0, momentum=0.9),
)

# learning rate scheduler
param_scheduler = [
    dict(
        type='LinearLR',
        start_factor=1e-4,
        by_epoch=True,
        begin=0,
        end=10,
        convert_to_iter_based=True),
    dict(
        type='CosineAnnealingLR',
        T_max=90,
        by_epoch=True,
        begin=10,
        end=100,
        eta_min=0.0,
        convert_to_iter_based=True)
]

# runtime settings
train_cfg = dict(by_epoch=True, max_epochs=100)

default_hooks = dict(
    checkpoint=dict(type='CheckpointHook', interval=1, max_keep_ckpts=3),
    logger=dict(type='LoggerHook', interval=10))

randomness = dict(seed=0, diff_rank_seed=True)