reproduce the code using mmdet/3d

[Li-Whasaka]

When I use the MMDET3D to reproduce your code, I encountered a situation where the loss kept decreasing but the mAP was almost zero. I don't know what's the reason? I'm not sure if it's an error in the mmdet3d library

And may I ask if your dataset partitioning code and the code provided in mmdet, as well as the pkl file for the partitioned nuscenes dataset, are they the same? Or have you made any modifications?

the config file :

_base_ = ['../_base_/datasets/nus-3d.py',
          '../_base_/default_runtime.py']
point_cloud_range = [-51.2, -51.2, -5.0, 51.2, 51.2, 3.0]
class_names = [
    'car', 'truck', 'construction_vehicle', 'bus', 'trailer', 'barrier',
    'motorcycle', 'bicycle', 'pedestrian', 'traffic_cone'
]
device='cuda'
data_config = {
    'cams': [
        'CAM_FRONT_LEFT', 'CAM_FRONT', 'CAM_FRONT_RIGHT', 'CAM_BACK_LEFT',
        'CAM_BACK', 'CAM_BACK_RIGHT'
    ],
    'Ncams': 6,
    'input_size': (256, 704),
    'src_size': (900, 1600),
    # Augmentation
    'resize': (-0.06, 0.11),
    'rot': (-5.4, 5.4),
    'flip': True,
    'crop_h': (0.0, 0.0),
    'resize_test': 0.00,
}
grid_config = {
    'xbound': [-51.2, 51.2, 0.8],
    'ybound': [-51.2, 51.2, 0.8],
    'zbound': [-5, 3, 8],
    'dbound': [2.0, 58.0, 0.5],
}
voxel_size = [0.1, 0.1, 0.2]
numC_Trans = 64
model = dict(
    type='BEVDepth',
    img_backbone=dict(
        pretrained='torchvision:https://resnet50',
        type='ResNet',
        depth=50,
        # num_stages=4,
        out_indices=(0, 1, 2, 3),
        frozen_stages=-1,
        norm_cfg=dict(type='BN', requires_grad=True),
        norm_eval=False,
        with_cp=True,
        style='pytorch'
    ),
    img_neck=dict(
        type='SECONDFPN',
        in_channels=[256, 512, 1024, 2048],
        upsample_strides=[0.25, 0.5, 1, 2],
        out_channels=[128, 128, 128, 128],
    ),
    img_view_transformer=dict(
        type='ViewTransformerLSSBEVDepth',
        loss_depth_weight=100.0,
        grid_config=grid_config,
        data_config=data_config,
        numC_Trans=64,
        extra_depth_net=dict(type='ResNetForBEVDet', numC_input=512,
                                num_layer=[3,], num_channels=[512,], stride=[1,],
        )
    ) ,
    # img_bev_encoder_backbone=dict(
    #     type='ResNet',
    #     in_channels=numC_Trans,
    #     depth=18,
    #     num_stages=4,
    #     # strides=(1, 2, 2,),
    #     # dilations=(1, 1, 1),
    #     out_indices=(0, 1, 2, 3),
    #     norm_eval=False,
    #     # base_channels=80,
    # ),
    img_bev_encoder_backbone=dict(
        type='ResNetForBEVDet',
        numC_input=numC_Trans,
        num_channels=[numC_Trans * 2, numC_Trans * 4, numC_Trans * 8]
    ),
    # img_bev_encoder_neck=dict(
    #     type='SECONDFPN',
    #     in_channels=[80, 160, 320, 640],
    #     upsample_strides=[1, 2, 4, 8],
    #     out_channels=64
    # ),
    img_bev_encoder_neck=dict(
        type='FPN_LSS',
        in_channels=numC_Trans * 8 + numC_Trans * 2,
        out_channels=256
    ),
    # img_bev_encoder_neck=dict(
    #     type='FPN_LSS',
    #     in_channels=320,
    #     out_channels=256
    # ),
    pts_bbox_head=dict(
        type='CenterHead',
        in_channels=256,
        tasks=[
            dict(num_class=1, class_names=['car']),
            dict(num_class=2, class_names=['truck', 'construction_vehicle']),
            dict(num_class=2, class_names=['bus', 'trailer']),
            dict(num_class=1, class_names=['barrier']),
            dict(num_class=2, class_names=['motorcycle', 'bicycle']),
            dict(num_class=2, class_names=['pedestrian', 'traffic_cone']),
        ],
        common_heads=dict(
            reg=(2, 2), height=(1, 2), dim=(3, 2), rot=(2, 2), vel=(2, 2)),
        share_conv_channel=128,
        bbox_coder=dict(
            type='CenterPointBBoxCoder',
            pc_range=[-51.2, -51.2, -5, 51.2, 51.2, 3],
            post_center_range=[-61.2, -61.2, -10.0, 61.2, 61.2, 10.0],
            max_num=500,
            score_threshold=0.1,
            out_size_factor=4,
            voxel_size=voxel_size,
            code_size=9),
        separate_head=dict(type='SeparateHead', init_bias=-2.19, final_kernel=3),
        loss_cls=dict(type='GaussianFocalLoss', reduction='mean'),
        loss_bbox=dict(type='L1Loss', reduction='mean', loss_weight=0.25),
        norm_bbox=True),
    # model training and testing settings
    train_cfg=dict(
        pts=dict(
            point_cloud_range=point_cloud_range,
            grid_size=[512, 512, 1],
            voxel_size=voxel_size,
            out_size_factor=4,
            dense_reg=1,
            gaussian_overlap=0.1,
            max_objs=500,
            min_radius=2,
            code_weights=[1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.5, 0.5],
        )
    ),
    test_cfg=dict(
        pts=dict(
            pc_range=point_cloud_range[:2],
            post_center_limit_range=[-61.2, -61.2, -10.0, 61.2, 61.2, 10.0],
            max_per_img=500,
            max_pool_nms=False,
            min_radius=[4, 12, 10, 1, 0.85, 0.175],
            score_threshold=0.1,
            out_size_factor=8,
            voxel_size=[0.2, 0.2, 8],
            pre_max_size=1000,
            post_max_size=83,
            # Scale-NMS
            nms_type=['rotate', 'rotate', 'rotate', 'circle', 'rotate', 'rotate'],
            nms_thr=[0.2, 0.2, 0.2, 0.2, 0.2, 0.5],
            nms_rescale_factor=[1.0, [0.7, 0.7], [0.4, 0.55], 1.1, [1.0,1.0], [4.5, 9.0]]
        )
    )
)

# Data
dataset_type = 'NuScenesDataset'
data_root = '/home/lwx/Desktop/lwx/distill-bev/data/nuscenes/'
file_client_args = dict(backend='disk')

# bda_aug_conf = dict(
#     rot_lim=(-22.5, 22.5),
#     scale_lim=(0.95, 1.05),
#     flip_dx_ratio=0.5,
#     flip_dy_ratio=0.5)

train_pipeline = [
    dict(type='LoadMultiViewImageFromFiles_BEVDet', is_train=True, data_config=data_config,
        root_path=data_root),
    dict(
        type='LoadPointsFromFile',
        coord_type='LIDAR',
        load_dim=5,
        use_dim=5,
        file_client_args=file_client_args,
        root_path=data_root),
    
    dict(type='PointToMultiViewDepth', grid_config=grid_config),
    dict(
        type='LoadPointsFromMultiSweeps',
        sweeps_num=9,
        use_dim=[0, 1, 2, 3, 4],
        file_client_args=file_client_args,
        pad_empty_sweeps=True,
        remove_close=True
    ),
    dict(type='LoadAnnotations3D', with_bbox_3d=True, with_label_3d=True),
    # dict(
    #     type='BEVAug',
    #     bda_aug_conf=bda_aug_conf,
    #     classes=class_names),
    dict(
        type='GlobalRotScaleTrans',
        rot_range=[-0.3925, 0.3925],
        scale_ratio_range=[0.95, 1.05],
        translation_std=[0, 0, 0],
        update_img2lidar=True),
    dict(
        type='RandomFlip3D',
        sync_2d=False,
        flip_ratio_bev_horizontal=0.5,
        flip_ratio_bev_vertical=0.5,
        update_img2lidar=True),
    dict(type='PointsRangeFilter', point_cloud_range=point_cloud_range),
    dict(type='ObjectRangeFilter', point_cloud_range=point_cloud_range),
    dict(type='ObjectNameFilter', classes=class_names),
    dict(type='DefaultFormatBundle3D', class_names=class_names),
    dict(type='Collect3D', keys=['img_inputs', 'gt_bboxes_3d', 'gt_labels_3d'], 
         meta_keys=('filename', 'ori_shape', 'img_shape', 'lidar2img',
                            'depth2img', 'cam2img', 'pad_shape',
                            'scale_factor', 'flip', 'pcd_horizontal_flip',
                            'pcd_vertical_flip', 'box_mode_3d', 'box_type_3d',
                            'img_norm_cfg', 'pcd_trans', 'sample_idx',
                            'pcd_scale_factor', 'pcd_rotation', 'pts_filename',
                            'transformation_3d_flow', 'img_info')
    )
]

test_pipeline = [
    dict(type='LoadMultiViewImageFromFiles_BEVDet', data_config=data_config,
         trans_only=False,
         root_path=data_root),
    # load lidar points for --show in test.py only
    dict(
        type='LoadPointsFromFile',
        coord_type='LIDAR',
        load_dim=5,
        use_dim=5,
        file_client_args=file_client_args,
        root_path=data_root),
    dict(type='PointToMultiViewDepth', grid_config=grid_config),
    dict(
        type='MultiScaleFlipAug3D',
        img_scale=(1333, 800),
        pts_scale_ratio=1,
        flip=False,
        transforms=[
            dict(
                type='DefaultFormatBundle3D',
                class_names=class_names,
                with_label=False),
            dict(type='Collect3D', keys=['points', 'img_inputs'],
                 meta_keys=('filename', 'ori_shape', 'img_shape', 'lidar2img',
                            'depth2img', 'cam2img', 'pad_shape',
                            'scale_factor', 'flip', 'pcd_horizontal_flip',
                            'pcd_vertical_flip', 'box_mode_3d', 'box_type_3d',
                            'img_norm_cfg', 'pcd_trans', 'sample_idx',
                            'pcd_scale_factor', 'pcd_rotation', 'pts_filename',
                            'transformation_3d_flow', 'adjacent', 'adjacent_type',)
                 )
        ])
]
# construct a pipeline for data and gt loading in show function
# please keep its loading function consistent with test_pipeline (e.g. client)
eval_pipeline = [
    dict(type='LoadMultiViewImageFromFiles_BEVDet', data_config=data_config,
         trans_only=False,
        root_path=data_root),
    dict(
        type='LoadPointsFromFile',
        coord_type='LIDAR',
        load_dim=5,
        use_dim=5,
        file_client_args=file_client_args,
        root_path=data_root),
    dict(type='PointToMultiViewDepth', grid_config=grid_config),
    dict(
        type='DefaultFormatBundle3D',
        class_names=class_names,
        with_label=False),
    dict(type='Collect3D', keys=['img_inputs'])
]


input_modality = dict(
    use_lidar=False,
    use_camera=True,
    use_radar=False,
    use_map=False,
    use_external=False)

data = dict(
    samples_per_gpu=2,
    workers_per_gpu=8,
    train=dict(
        type='CBGSDataset',
        dataset=dict(
            type=dataset_type,
            data_root=data_root,
            ann_file=data_root + 'nuscenes_infos_train.pkl',
            pipeline=train_pipeline,
            classes=class_names,
            test_mode=False,
            use_valid_flag=True,
            modality=input_modality,
            # we use box_type_3d='LiDAR' in kitti and nuscenes dataset
            # and box_type_3d='Depth' in sunrgbd and scannet dataset.
            box_type_3d='LiDAR',
            img_info_prototype='bevdet',
            speed_mode='abs_dis',
            max_interval=9,
            min_interval=2,
            prev_only=True,
            fix_direction=True)),
    val=dict(pipeline=test_pipeline, classes=class_names,
            ann_file=data_root + 'nuscenes_infos_val.pkl',
        modality=input_modality, img_info_prototype='bevdet',
             max_interval=10, fix_direction=True,),
    test=dict(pipeline=test_pipeline, classes=class_names,
            ann_file=data_root + 'nuscenes_infos_val.pkl',
              modality=input_modality,
              img_info_prototype='bevdet',
            speed_mode='abs_dis',
              max_interval=10,
              fix_direction=True,))

# Optimizer
# optimizer = dict(type='AdamW', lr=0.01, weight_decay=1e-07)
optimizer = dict(type='AdamW', lr=2e-4, weight_decay=1e-07)
# optimizer_config = dict(grad_clip=dict(max_norm=5, norm_type=2))
optimizer_config = dict(grad_clip=None)
lr_config = dict(
    policy='step',
    warmup='linear',
    warmup_iters=200,
    warmup_ratio=0.001,
    step=[24,])

runner = dict(type='EpochBasedRunner', max_epochs=80)
evaluation = dict(interval=1)
checkpoint_config = dict(interval=1)

# fp16 = dict(loss_scale='dynamic')