segnext_mscan-t_1x16_512x512_adamw_160k_ade20k.py

_base_ = [
    '../_base_/default_runtime.py', '../_base_/schedules/schedule_160k.py'
]
# model settings
checkpoint_file = 'https://download.openmmlab.com/mmsegmentation/v0.5/pretrain/segnext/mscan_t_20230227-119e8c9f.pth'  # noqa
ham_norm_cfg = dict(type='GN', num_groups=32, requires_grad=True)
model = dict(
    type='EncoderDecoder',
    pretrained=None,
    backbone=dict(
        type='MSCAN',
        init_cfg=dict(type='Pretrained', checkpoint=checkpoint_file),
        embed_dims=[32, 64, 160, 256],
        mlp_ratios=[8, 8, 4, 4],
        drop_rate=0.0,
        drop_path_rate=0.1,
        depths=[3, 3, 5, 2],
        attention_kernel_sizes=[5, [1, 7], [1, 11], [1, 21]],
        attention_kernel_paddings=[2, [0, 3], [0, 5], [0, 10]],
        act_cfg=dict(type='GELU'),
        norm_cfg=dict(type='BN', requires_grad=True)),
    decode_head=dict(
        type='LightHamHead',
        in_channels=[64, 160, 256],
        in_index=[1, 2, 3],
        channels=256,
        ham_channels=256,
        dropout_ratio=0.1,
        num_classes=150,
        norm_cfg=ham_norm_cfg,
        align_corners=False,
        loss_decode=dict(
            type='CrossEntropyLoss', use_sigmoid=False, loss_weight=1.0),
        ham_kwargs=dict(
            MD_S=1,
            MD_R=16,
            train_steps=6,
            eval_steps=7,
            inv_t=100,
            rand_init=True)),
    # model training and testing settings
    train_cfg=dict(),
    test_cfg=dict(mode='whole'))

# dataset settings
dataset_type = 'ADE20KDataset'
data_root = 'data/ade/ADEChallengeData2016'
img_norm_cfg = dict(
    mean=[123.675, 116.28, 103.53], std=[58.395, 57.12, 57.375], to_rgb=True)
crop_size = (512, 512)
train_pipeline = [
    dict(type='LoadImageFromFile'),
    dict(type='LoadAnnotations', reduce_zero_label=True),
    dict(type='Resize', img_scale=(2048, 512), ratio_range=(0.5, 2.0)),
    dict(type='RandomCrop', crop_size=crop_size, cat_max_ratio=0.75),
    dict(type='RandomFlip', prob=0.5),
    dict(type='PhotoMetricDistortion'),
    dict(type='Normalize', **img_norm_cfg),
    dict(type='Pad', size=crop_size, pad_val=0, seg_pad_val=255),
    dict(type='DefaultFormatBundle'),
    dict(type='Collect', keys=['img', 'gt_semantic_seg']),
]
test_pipeline = [
    dict(type='LoadImageFromFile'),
    dict(
        type='MultiScaleFlipAug',
        img_scale=(2048, 512),
        # img_ratios=[0.5, 0.75, 1.0, 1.25, 1.5, 1.75],
        flip=False,
        transforms=[
            dict(type='Resize', keep_ratio=True),
            dict(type='ResizeToMultiple', size_divisor=32),
            dict(type='RandomFlip'),
            dict(type='Normalize', **img_norm_cfg),
            dict(type='ImageToTensor', keys=['img']),
            dict(type='Collect', keys=['img']),
        ])
]
data = dict(
    samples_per_gpu=16,
    workers_per_gpu=4,
    train=dict(
        type='RepeatDataset',
        times=50,
        dataset=dict(
            type=dataset_type,
            data_root=data_root,
            img_dir='images/training',
            ann_dir='annotations/training',
            pipeline=train_pipeline)),
    val=dict(
        type=dataset_type,
        data_root=data_root,
        img_dir='images/validation',
        ann_dir='annotations/validation',
        pipeline=test_pipeline),
    test=dict(
        type=dataset_type,
        data_root=data_root,
        img_dir='images/validation',
        ann_dir='annotations/validation',
        pipeline=test_pipeline))

# optimizer
optimizer = dict(
    _delete_=True,
    type='AdamW',
    lr=0.00006,
    betas=(0.9, 0.999),
    weight_decay=0.01,
    paramwise_cfg=dict(
        custom_keys={
            'pos_block': dict(decay_mult=0.),
            'norm': dict(decay_mult=0.),
            'head': dict(lr_mult=10.)
        }))

lr_config = dict(
    _delete_=True,
    policy='poly',
    warmup='linear',
    warmup_iters=1500,
    warmup_ratio=1e-6,
    power=1.0,
    min_lr=0.0,
    by_epoch=False)