_base_ = 'yolov5_s-v61_fast_1xb12-40e_cat.py'

# This configuration is used to provide non-square training examples
# Must be a multiple of 32
img_scale = (608, 352)  # w h

anchors = [
    [(65, 35), (159, 45), (119, 80)],  # P3/8
    [(215, 77), (224, 116), (170, 166)],  # P4/16
    [(376, 108), (339, 176), (483, 190)]  # P5/32
]

# ===============================Unmodified in most cases====================
_base_.model.bbox_head.loss_obj.loss_weight = 1.0 * ((img_scale[1] / 640)**2)
_base_.model.bbox_head.prior_generator.base_sizes = anchors

train_pipeline = [
    *_base_.pre_transform,
    dict(
        type='Mosaic',
        img_scale=img_scale,
        pad_val=114.0,
        pre_transform=_base_.pre_transform),
    dict(
        type='YOLOv5RandomAffine',
        max_rotate_degree=0.0,
        max_shear_degree=0.0,
        scaling_ratio_range=(1 - _base_.affine_scale, 1 + _base_.affine_scale),
        # img_scale is (width, height)
        border=(-img_scale[0] // 2, -img_scale[1] // 2),
        border_val=(114, 114, 114)),
    dict(
        type='mmdet.Albu',
        transforms=_base_.albu_train_transforms,
        bbox_params=dict(
            type='BboxParams',
            format='pascal_voc',
            label_fields=['gt_bboxes_labels', 'gt_ignore_flags']),
        keymap={
            'img': 'image',
            'gt_bboxes': 'bboxes'
        }),
    dict(type='YOLOv5HSVRandomAug'),
    dict(type='mmdet.RandomFlip', prob=0.5),
    dict(
        type='mmdet.PackDetInputs',
        meta_keys=('img_id', 'img_path', 'ori_shape', 'img_shape', 'flip',
                   'flip_direction'))
]

_base_.train_dataloader.dataset.pipeline = train_pipeline

test_pipeline = [
    dict(type='LoadImageFromFile', backend_args=_base_.backend_args),
    dict(type='YOLOv5KeepRatioResize', scale=img_scale),
    dict(
        type='LetterResize',
        scale=img_scale,
        allow_scale_up=False,
        pad_val=dict(img=114)),
    dict(type='mmdet.LoadAnnotations', with_bbox=True),
    dict(
        type='mmdet.PackDetInputs',
        meta_keys=('img_id', 'img_path', 'ori_shape', 'img_shape',
                   'scale_factor', 'pad_param'))
]

val_dataloader = dict(
    dataset=dict(pipeline=test_pipeline, batch_shapes_cfg=None))
test_dataloader = val_dataloader