detector.py

_base_ = 'mmocr/configs/textdet/dbnet/dbnet_r18_fpnc_1200e_icdar2015.py'

load_from = 'mmocr/checkpoints/dbnet_r18_fpnc_sbn_1200e_icdar2015_20210329-ba3ab597.pth'

optimizer = dict(
  type='SGD',
  lr = 0.001,
  momentum=0.9,
  weight_decay=0.0005
)

#----------------------------------------------------------------------

model = dict(
    type='DBNet',
    pretrained='torchvision://resnet18',
    backbone=dict(
        type='ResNet',
        depth=18,
        num_stages=4,
        out_indices=(0, 1, 2, 3),
        frozen_stages=-1,
        norm_cfg=dict(type='BN', requires_grad=True),
        norm_eval=False,
        style='caffe'),
    neck=dict(
        type='FPNC', in_channels=[64, 128, 256, 512], lateral_channels=256),
    bbox_head=dict(
        type='DBHead',
        text_repr_type='quad',
        in_channels=256,
        loss=dict(type='DBLoss', alpha=5.0, beta=10.0, bbce_loss=True)),
    train_cfg=None,
    test_cfg=None)


dataset_type = 'IcdarDataset'
data_root = 'data/detection'
img_norm_cfg = dict(
    mean=[123.675, 116.28, 103.53], std=[58.395, 57.12, 57.375], to_rgb=True)
# for visualizing img, pls uncomment it.
# img_norm_cfg = dict(mean=[0, 0, 0], std=[1, 1, 1], to_rgb=True)


train_pipeline = [
    dict(type='LoadImageFromFile'),
    dict(
        type='LoadTextAnnotations',
        with_bbox=True,
        with_mask=True,
        poly2mask=False),
    dict(type='ColorJitter', brightness=32.0 / 255, saturation=0.5),
    dict(type='Normalize', **img_norm_cfg),
    # img aug
    dict(
        type='ImgAug',
        args=[['Fliplr', 0.5],
              dict(cls='Affine', rotate=[-10, 10]), ['Resize', [0.5, 3.0]]]),
    # random crop
    dict(type='EastRandomCrop', target_size=(640, 640)),
    dict(type='DBNetTargets', shrink_ratio=0.4),
    dict(type='Pad', size_divisor=32),
    # for visualizing img and gts, pls set visualize = True
    dict(
        type='CustomFormatBundle',
        keys=['gt_shrink', 'gt_shrink_mask', 'gt_thr', 'gt_thr_mask'],
        visualize=dict(flag=False, boundary_key='gt_shrink')),
    dict(
        type='Collect',
        keys=['img', 'gt_shrink', 'gt_shrink_mask', 'gt_thr', 'gt_thr_mask'])
]


test_pipeline = [
    dict(type='LoadImageFromFile'),
    dict(
        type='MultiScaleFlipAug',
        img_scale=(1333, 736),
        flip=False,
        transforms=[
            dict(type='Resize', img_scale=(2944, 736), keep_ratio=True),
            dict(type='Normalize', **img_norm_cfg),
            dict(type='Pad', size_divisor=32),
            dict(type='ImageToTensor', keys=['img']),
            dict(type='Collect', keys=['img']),
        ])
]


data = dict(
    samples_per_gpu=16,
    workers_per_gpu=8,
    val_dataloader=dict(samples_per_gpu=1),
    test_dataloader=dict(samples_per_gpu=1),
    train=dict(
        type=dataset_type,
        ann_file=data_root + '/instances_training.json',
        # for debugging top k imgs
        # select_first_k=200,
        img_prefix=data_root + '/imgs/train',
        pipeline=train_pipeline),
    val=dict(
        type=dataset_type,
        ann_file=data_root + '/instances_test.json',
        img_prefix=data_root + '/imgs',
        # select_first_k=100,
        pipeline=test_pipeline),
    test=dict(
        type=dataset_type,
        ann_file=data_root + '/instances_test.json',
        img_prefix=data_root + '/imgs/test',
        # select_first_k=100,
        pipeline=test_pipeline))


evaluation = dict(interval=100, metric='hmean-iou')