support occupancy prediction

autonomous_driving/occupancy_prediction/projects/configs/_base_/models/paconv_ssg.py

+# model settings
+model = dict(
+    type='EncoderDecoder3D',
+    backbone=dict(
+        type='PointNet2SASSG',
+        in_channels=9,  # [xyz, rgb, normalized_xyz]
+        num_points=(1024, 256, 64, 16),
+        radius=(None, None, None, None),  # use kNN instead of ball query
+        num_samples=(32, 32, 32, 32),
+        sa_channels=((32, 32, 64), (64, 64, 128), (128, 128, 256), (256, 256,
+                                                                    512)),
+        fp_channels=(),
+        norm_cfg=dict(type='BN2d', momentum=0.1),
+        sa_cfg=dict(
+            type='PAConvSAModule',
+            pool_mod='max',
+            use_xyz=True,
+            normalize_xyz=False,
+            paconv_num_kernels=[16, 16, 16],
+            paconv_kernel_input='w_neighbor',
+            scorenet_input='w_neighbor_dist',
+            scorenet_cfg=dict(
+                mlp_channels=[16, 16, 16],
+                score_norm='softmax',
+                temp_factor=1.0,
+                last_bn=False))),
+    decode_head=dict(
+        type='PAConvHead',
+        # PAConv model's decoder takes skip connections from beckbone
+        # different from PointNet++, it also concats input features in the last
+        # level of decoder, leading to `128 + 6` as the channel number
+        fp_channels=((768, 256, 256), (384, 256, 256), (320, 256, 128),
+                     (128 + 6, 128, 128, 128)),
+        channels=128,
+        dropout_ratio=0.5,
+        conv_cfg=dict(type='Conv1d'),
+        norm_cfg=dict(type='BN1d'),
+        act_cfg=dict(type='ReLU'),
+        loss_decode=dict(
+            type='CrossEntropyLoss',
+            use_sigmoid=False,
+            class_weight=None,  # should be modified with dataset
+            loss_weight=1.0)),
+    # correlation loss to regularize PAConv's kernel weights
+    loss_regularization=dict(
+        type='PAConvRegularizationLoss', reduction='sum', loss_weight=10.0),
+    # model training and testing settings
+    train_cfg=dict(),
+    test_cfg=dict(mode='slide'))

autonomous_driving/occupancy_prediction/projects/configs/_base_/models/parta2.py

+# model settings
+voxel_size = [0.05, 0.05, 0.1]
+point_cloud_range = [0, -40, -3, 70.4, 40, 1]
+
+model = dict(
+    type='PartA2',
+    voxel_layer=dict(
+        max_num_points=5,  # max_points_per_voxel
+        point_cloud_range=point_cloud_range,
+        voxel_size=voxel_size,
+        max_voxels=(16000, 40000)  # (training, testing) max_voxels
+    ),
+    voxel_encoder=dict(type='HardSimpleVFE'),
+    middle_encoder=dict(
+        type='SparseUNet',
+        in_channels=4,
+        sparse_shape=[41, 1600, 1408],
+        order=('conv', 'norm', 'act')),
+    backbone=dict(
+        type='SECOND',
+        in_channels=256,
+        layer_nums=[5, 5],
+        layer_strides=[1, 2],
+        out_channels=[128, 256]),
+    neck=dict(
+        type='SECONDFPN',
+        in_channels=[128, 256],
+        upsample_strides=[1, 2],
+        out_channels=[256, 256]),
+    rpn_head=dict(
+        type='PartA2RPNHead',
+        num_classes=3,
+        in_channels=512,
+        feat_channels=512,
+        use_direction_classifier=True,
+        anchor_generator=dict(
+            type='Anchor3DRangeGenerator',
+            ranges=[[0, -40.0, -0.6, 70.4, 40.0, -0.6],
+                    [0, -40.0, -0.6, 70.4, 40.0, -0.6],
+                    [0, -40.0, -1.78, 70.4, 40.0, -1.78]],
+            sizes=[[0.6, 0.8, 1.73], [0.6, 1.76, 1.73], [1.6, 3.9, 1.56]],
+            rotations=[0, 1.57],
+            reshape_out=False),
+        diff_rad_by_sin=True,
+        assigner_per_size=True,
+        assign_per_class=True,
+        bbox_coder=dict(type='DeltaXYZWLHRBBoxCoder'),
+        loss_cls=dict(
+            type='FocalLoss',
+            use_sigmoid=True,
+            gamma=2.0,
+            alpha=0.25,
+            loss_weight=1.0),
+        loss_bbox=dict(type='SmoothL1Loss', beta=1.0 / 9.0, loss_weight=2.0),
+        loss_dir=dict(
+            type='CrossEntropyLoss', use_sigmoid=False, loss_weight=0.2)),
+    roi_head=dict(
+        type='PartAggregationROIHead',
+        num_classes=3,
+        semantic_head=dict(
+            type='PointwiseSemanticHead',
+            in_channels=16,
+            extra_width=0.2,
+            seg_score_thr=0.3,
+            num_classes=3,
+            loss_seg=dict(
+                type='FocalLoss',
+                use_sigmoid=True,
+                reduction='sum',
+                gamma=2.0,
+                alpha=0.25,
+                loss_weight=1.0),
+            loss_part=dict(
+                type='CrossEntropyLoss', use_sigmoid=True, loss_weight=1.0)),
+        seg_roi_extractor=dict(
+            type='Single3DRoIAwareExtractor',
+            roi_layer=dict(
+                type='RoIAwarePool3d',
+                out_size=14,
+                max_pts_per_voxel=128,
+                mode='max')),
+        part_roi_extractor=dict(
+            type='Single3DRoIAwareExtractor',
+            roi_layer=dict(
+                type='RoIAwarePool3d',
+                out_size=14,
+                max_pts_per_voxel=128,
+                mode='avg')),
+        bbox_head=dict(
+            type='PartA2BboxHead',
+            num_classes=3,
+            seg_in_channels=16,
+            part_in_channels=4,
+            seg_conv_channels=[64, 64],
+            part_conv_channels=[64, 64],
+            merge_conv_channels=[128, 128],
+            down_conv_channels=[128, 256],
+            bbox_coder=dict(type='DeltaXYZWLHRBBoxCoder'),
+            shared_fc_channels=[256, 512, 512, 512],
+            cls_channels=[256, 256],
+            reg_channels=[256, 256],
+            dropout_ratio=0.1,
+            roi_feat_size=14,
+            with_corner_loss=True,
+            loss_bbox=dict(
+                type='SmoothL1Loss',
+                beta=1.0 / 9.0,
+                reduction='sum',
+                loss_weight=1.0),
+            loss_cls=dict(
+                type='CrossEntropyLoss',
+                use_sigmoid=True,
+                reduction='sum',
+                loss_weight=1.0))),
+    # model training and testing settings
+    train_cfg=dict(
+        rpn=dict(
+            assigner=[
+                dict(  # for Pedestrian
+                    type='MaxIoUAssigner',
+                    iou_calculator=dict(type='BboxOverlapsNearest3D'),
+                    pos_iou_thr=0.5,
+                    neg_iou_thr=0.35,
+                    min_pos_iou=0.35,
+                    ignore_iof_thr=-1),
+                dict(  # for Cyclist
+                    type='MaxIoUAssigner',
+                    iou_calculator=dict(type='BboxOverlapsNearest3D'),
+                    pos_iou_thr=0.5,
+                    neg_iou_thr=0.35,
+                    min_pos_iou=0.35,
+                    ignore_iof_thr=-1),
+                dict(  # for Car
+                    type='MaxIoUAssigner',
+                    iou_calculator=dict(type='BboxOverlapsNearest3D'),
+                    pos_iou_thr=0.6,
+                    neg_iou_thr=0.45,
+                    min_pos_iou=0.45,
+                    ignore_iof_thr=-1)
+            ],
+            allowed_border=0,
+            pos_weight=-1,
+            debug=False),
+        rpn_proposal=dict(
+            nms_pre=9000,
+            nms_post=512,
+            max_num=512,
+            nms_thr=0.8,
+            score_thr=0,
+            use_rotate_nms=False),
+        rcnn=dict(
+            assigner=[
+                dict(  # for Pedestrian
+                    type='MaxIoUAssigner',
+                    iou_calculator=dict(
+                        type='BboxOverlaps3D', coordinate='lidar'),
+                    pos_iou_thr=0.55,
+                    neg_iou_thr=0.55,
+                    min_pos_iou=0.55,
+                    ignore_iof_thr=-1),
+                dict(  # for Cyclist
+                    type='MaxIoUAssigner',
+                    iou_calculator=dict(
+                        type='BboxOverlaps3D', coordinate='lidar'),
+                    pos_iou_thr=0.55,
+                    neg_iou_thr=0.55,
+                    min_pos_iou=0.55,
+                    ignore_iof_thr=-1),
+                dict(  # for Car
+                    type='MaxIoUAssigner',
+                    iou_calculator=dict(
+                        type='BboxOverlaps3D', coordinate='lidar'),
+                    pos_iou_thr=0.55,
+                    neg_iou_thr=0.55,
+                    min_pos_iou=0.55,
+                    ignore_iof_thr=-1)
+            ],
+            sampler=dict(
+                type='IoUNegPiecewiseSampler',
+                num=128,
+                pos_fraction=0.55,
+                neg_piece_fractions=[0.8, 0.2],
+                neg_iou_piece_thrs=[0.55, 0.1],
+                neg_pos_ub=-1,
+                add_gt_as_proposals=False,
+                return_iou=True),
+            cls_pos_thr=0.75,
+            cls_neg_thr=0.25)),
+    test_cfg=dict(
+        rpn=dict(
+            nms_pre=1024,
+            nms_post=100,
+            max_num=100,
+            nms_thr=0.7,
+            score_thr=0,
+            use_rotate_nms=True),
+        rcnn=dict(
+            use_rotate_nms=True,
+            use_raw_score=True,
+            nms_thr=0.01,
+            score_thr=0.1)))

autonomous_driving/occupancy_prediction/projects/configs/_base_/models/pointnet2_msg.py

+_base_ = './pointnet2_ssg.py'
+
+# model settings
+model = dict(
+    backbone=dict(
+        _delete_=True,
+        type='PointNet2SAMSG',
+        in_channels=6,  # [xyz, rgb], should be modified with dataset
+        num_points=(1024, 256, 64, 16),
+        radii=((0.05, 0.1), (0.1, 0.2), (0.2, 0.4), (0.4, 0.8)),
+        num_samples=((16, 32), (16, 32), (16, 32), (16, 32)),
+        sa_channels=(((16, 16, 32), (32, 32, 64)), ((64, 64, 128), (64, 96,
+                                                                    128)),
+                     ((128, 196, 256), (128, 196, 256)), ((256, 256, 512),
+                                                          (256, 384, 512))),
+        aggregation_channels=(None, None, None, None),
+        fps_mods=(('D-FPS'), ('D-FPS'), ('D-FPS'), ('D-FPS')),
+        fps_sample_range_lists=((-1), (-1), (-1), (-1)),
+        dilated_group=(False, False, False, False),
+        out_indices=(0, 1, 2, 3),
+        sa_cfg=dict(
+            type='PointSAModuleMSG',
+            pool_mod='max',
+            use_xyz=True,
+            normalize_xyz=False)),
+    decode_head=dict(
+        fp_channels=((1536, 256, 256), (512, 256, 256), (352, 256, 128),
+                     (128, 128, 128, 128))))

autonomous_driving/occupancy_prediction/projects/configs/_base_/models/pointnet2_ssg.py

+# model settings
+model = dict(
+    type='EncoderDecoder3D',
+    backbone=dict(
+        type='PointNet2SASSG',
+        in_channels=6,  # [xyz, rgb], should be modified with dataset
+        num_points=(1024, 256, 64, 16),
+        radius=(0.1, 0.2, 0.4, 0.8),
+        num_samples=(32, 32, 32, 32),
+        sa_channels=((32, 32, 64), (64, 64, 128), (128, 128, 256), (256, 256,
+                                                                    512)),
+        fp_channels=(),
+        norm_cfg=dict(type='BN2d'),
+        sa_cfg=dict(
+            type='PointSAModule',
+            pool_mod='max',
+            use_xyz=True,
+            normalize_xyz=False)),
+    decode_head=dict(
+        type='PointNet2Head',
+        fp_channels=((768, 256, 256), (384, 256, 256), (320, 256, 128),
+                     (128, 128, 128, 128)),
+        channels=128,
+        dropout_ratio=0.5,
+        conv_cfg=dict(type='Conv1d'),
+        norm_cfg=dict(type='BN1d'),
+        act_cfg=dict(type='ReLU'),
+        loss_decode=dict(
+            type='CrossEntropyLoss',
+            use_sigmoid=False,
+            class_weight=None,  # should be modified with dataset
+            loss_weight=1.0)),
+    # model training and testing settings
+    train_cfg=dict(),
+    test_cfg=dict(mode='slide'))

autonomous_driving/occupancy_prediction/projects/configs/_base_/models/votenet.py

+model = dict(
+    type='VoteNet',
+    backbone=dict(
+        type='PointNet2SASSG',
+        in_channels=4,
+        num_points=(2048, 1024, 512, 256),
+        radius=(0.2, 0.4, 0.8, 1.2),
+        num_samples=(64, 32, 16, 16),
+        sa_channels=((64, 64, 128), (128, 128, 256), (128, 128, 256),
+                     (128, 128, 256)),
+        fp_channels=((256, 256), (256, 256)),
+        norm_cfg=dict(type='BN2d'),
+        sa_cfg=dict(
+            type='PointSAModule',
+            pool_mod='max',
+            use_xyz=True,
+            normalize_xyz=True)),
+    bbox_head=dict(
+        type='VoteHead',
+        vote_module_cfg=dict(
+            in_channels=256,
+            vote_per_seed=1,
+            gt_per_seed=3,
+            conv_channels=(256, 256),
+            conv_cfg=dict(type='Conv1d'),
+            norm_cfg=dict(type='BN1d'),
+            norm_feats=True,
+            vote_loss=dict(
+                type='ChamferDistance',
+                mode='l1',
+                reduction='none',
+                loss_dst_weight=10.0)),
+        vote_aggregation_cfg=dict(
+            type='PointSAModule',
+            num_point=256,
+            radius=0.3,
+            num_sample=16,
+            mlp_channels=[256, 128, 128, 128],
+            use_xyz=True,
+            normalize_xyz=True),
+        pred_layer_cfg=dict(
+            in_channels=128, shared_conv_channels=(128, 128), bias=True),
+        conv_cfg=dict(type='Conv1d'),
+        norm_cfg=dict(type='BN1d'),
+        objectness_loss=dict(
+            type='CrossEntropyLoss',
+            class_weight=[0.2, 0.8],
+            reduction='sum',
+            loss_weight=5.0),
+        center_loss=dict(
+            type='ChamferDistance',
+            mode='l2',
+            reduction='sum',
+            loss_src_weight=10.0,
+            loss_dst_weight=10.0),
+        dir_class_loss=dict(
+            type='CrossEntropyLoss', reduction='sum', loss_weight=1.0),
+        dir_res_loss=dict(
+            type='SmoothL1Loss', reduction='sum', loss_weight=10.0),
+        size_class_loss=dict(
+            type='CrossEntropyLoss', reduction='sum', loss_weight=1.0),
+        size_res_loss=dict(
+            type='SmoothL1Loss', reduction='sum', loss_weight=10.0 / 3.0),
+        semantic_loss=dict(
+            type='CrossEntropyLoss', reduction='sum', loss_weight=1.0)),
+    # model training and testing settings
+    train_cfg=dict(
+        pos_distance_thr=0.3, neg_distance_thr=0.6, sample_mod='vote'),
+    test_cfg=dict(
+        sample_mod='seed',
+        nms_thr=0.25,
+        score_thr=0.05,
+        per_class_proposal=True))

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/cosine.py

+# This schedule is mainly used by models with dynamic voxelization
+# optimizer
+lr = 0.003  # max learning rate
+optimizer = dict(
+    type='AdamW',
+    lr=lr,
+    betas=(0.95, 0.99),  # the momentum is change during training
+    weight_decay=0.001)
+optimizer_config = dict(grad_clip=dict(max_norm=10, norm_type=2))
+
+lr_config = dict(
+    policy='CosineAnnealing',
+    warmup='linear',
+    warmup_iters=1000,
+    warmup_ratio=1.0 / 10,
+    min_lr_ratio=1e-5)
+
+momentum_config = None
+
+runner = dict(type='EpochBasedRunner', max_epochs=40)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/cyclic_20e.py

+# For nuScenes dataset, we usually evaluate the model at the end of training.
+# Since the models are trained by 24 epochs by default, we set evaluation
+# interval to be 20. Please change the interval accordingly if you do not
+# use a default schedule.
+# optimizer
+# This schedule is mainly used by models on nuScenes dataset
+optimizer = dict(type='AdamW', lr=1e-4, weight_decay=0.01)
+# max_norm=10 is better for SECOND
+optimizer_config = dict(grad_clip=dict(max_norm=35, norm_type=2))
+lr_config = dict(
+    policy='cyclic',
+    target_ratio=(10, 1e-4),
+    cyclic_times=1,
+    step_ratio_up=0.4,
+)
+momentum_config = dict(
+    policy='cyclic',
+    target_ratio=(0.85 / 0.95, 1),
+    cyclic_times=1,
+    step_ratio_up=0.4,
+)
+
+# runtime settings
+runner = dict(type='EpochBasedRunner', max_epochs=20)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/cyclic_40e.py

+# The schedule is usually used by models trained on KITTI dataset
+
+# The learning rate set in the cyclic schedule is the initial learning rate
+# rather than the max learning rate. Since the target_ratio is (10, 1e-4),
+# the learning rate will change from 0.0018 to 0.018, than go to 0.0018*1e-4
+lr = 0.0018
+# The optimizer follows the setting in SECOND.Pytorch, but here we use
+# the offcial AdamW optimizer implemented by PyTorch.
+optimizer = dict(type='AdamW', lr=lr, betas=(0.95, 0.99), weight_decay=0.01)
+optimizer_config = dict(grad_clip=dict(max_norm=10, norm_type=2))
+# We use cyclic learning rate and momentum schedule following SECOND.Pytorch
+# https://github.com/traveller59/second.pytorch/blob/3aba19c9688274f75ebb5e576f65cfe54773c021/torchplus/train/learning_schedules_fastai.py#L69  # noqa
+# We implement them in mmcv, for more details, please refer to
+# https://github.com/open-mmlab/mmcv/blob/f48241a65aebfe07db122e9db320c31b685dc674/mmcv/runner/hooks/lr_updater.py#L327  # noqa
+# https://github.com/open-mmlab/mmcv/blob/f48241a65aebfe07db122e9db320c31b685dc674/mmcv/runner/hooks/momentum_updater.py#L130  # noqa
+lr_config = dict(
+    policy='cyclic',
+    target_ratio=(10, 1e-4),
+    cyclic_times=1,
+    step_ratio_up=0.4,
+)
+momentum_config = dict(
+    policy='cyclic',
+    target_ratio=(0.85 / 0.95, 1),
+    cyclic_times=1,
+    step_ratio_up=0.4,
+)
+# Although the max_epochs is 40, this schedule is usually used we
+# RepeatDataset with repeat ratio N, thus the actual max epoch
+# number could be Nx40
+runner = dict(type='EpochBasedRunner', max_epochs=40)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/mmdet_schedule_1x.py

+# optimizer
+optimizer = dict(type='SGD', lr=0.02, momentum=0.9, weight_decay=0.0001)
+optimizer_config = dict(grad_clip=None)
+# learning policy
+lr_config = dict(
+    policy='step',
+    warmup='linear',
+    warmup_iters=500,
+    warmup_ratio=0.001,
+    step=[8, 11])
+runner = dict(type='EpochBasedRunner', max_epochs=12)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/schedule_2x.py

+# optimizer
+# This schedule is mainly used by models on nuScenes dataset
+optimizer = dict(type='AdamW', lr=0.001, weight_decay=0.01)
+# max_norm=10 is better for SECOND
+optimizer_config = dict(grad_clip=dict(max_norm=35, norm_type=2))
+lr_config = dict(
+    policy='step',
+    warmup='linear',
+    warmup_iters=1000,
+    warmup_ratio=1.0 / 1000,
+    step=[20, 23])
+momentum_config = None
+# runtime settings
+runner = dict(type='EpochBasedRunner', max_epochs=24)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/schedule_3x.py

+# optimizer
+# This schedule is mainly used by models on indoor dataset,
+# e.g., VoteNet on SUNRGBD and ScanNet
+lr = 0.008  # max learning rate
+optimizer = dict(type='AdamW', lr=lr, weight_decay=0.01)
+optimizer_config = dict(grad_clip=dict(max_norm=10, norm_type=2))
+lr_config = dict(policy='step', warmup=None, step=[24, 32])
+# runtime settings
+runner = dict(type='EpochBasedRunner', max_epochs=36)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/seg_cosine_150e.py

+# optimizer
+# This schedule is mainly used on S3DIS dataset in segmentation task
+optimizer = dict(type='SGD', lr=0.2, weight_decay=0.0001, momentum=0.9)
+optimizer_config = dict(grad_clip=None)
+lr_config = dict(policy='CosineAnnealing', warmup=None, min_lr=0.002)
+momentum_config = None
+
+# runtime settings
+runner = dict(type='EpochBasedRunner', max_epochs=150)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/seg_cosine_200e.py

+# optimizer
+# This schedule is mainly used on ScanNet dataset in segmentation task
+optimizer = dict(type='Adam', lr=0.001, weight_decay=0.01)
+optimizer_config = dict(grad_clip=None)
+lr_config = dict(policy='CosineAnnealing', warmup=None, min_lr=1e-5)
+momentum_config = None
+
+# runtime settings
+runner = dict(type='EpochBasedRunner', max_epochs=200)

autonomous_driving/occupancy_prediction/projects/configs/_base_/schedules/seg_cosine_50e.py

+# optimizer
+# This schedule is mainly used on S3DIS dataset in segmentation task
+optimizer = dict(type='Adam', lr=0.001, weight_decay=0.001)
+optimizer_config = dict(grad_clip=None)
+lr_config = dict(policy='CosineAnnealing', warmup=None, min_lr=1e-5)
+momentum_config = None
+
+# runtime settings
+runner = dict(type='EpochBasedRunner', max_epochs=50)

autonomous_driving/occupancy_prediction/projects/configs/bevformer/.ipynb_checkpoints/bevformer_small_occ-checkpoint.py

+_base_ = [
+    '../datasets/custom_nus-3d.py',
+    '../_base_/default_runtime.py'
+]
+#
+plugin = True
+plugin_dir = 'projects/mmdet3d_plugin/'
+
+# If point cloud range is changed, the models should also change their point
+# cloud range accordingly
+point_cloud_range = [-40, -40, -1.0, 40, 40, 5.4]
+voxel_size = [0.2, 0.2, 8]
+
+
+
+img_norm_cfg = dict(
+    mean=[103.530, 116.280, 123.675], std=[1.0, 1.0, 1.0], to_rgb=False)
+# For nuScenes we usually do 10-class detection
+class_names = [
+    'car', 'truck', 'construction_vehicle', 'bus', 'trailer', 'barrier',
+    'motorcycle', 'bicycle', 'pedestrian', 'traffic_cone'
+]
+
+input_modality = dict(
+    use_lidar=False,
+    use_camera=True,
+    use_radar=False,
+    use_map=False,
+    use_external=True)
+
+_dim_ = 256
+_pos_dim_ = _dim_//2
+_ffn_dim_ = _dim_*2
+_num_levels_ = 2
+bev_h_ = 200
+bev_w_ = 200
+queue_length = 4 # each sequence contains `queue_length` frames.
+model = dict(
+    type='BEVFormerOcc',
+    use_grid_mask=True,
+    video_test_mode=True,
+    img_backbone=dict(
+        type='ResNet',
+        depth=50,
+        num_stages=4,
+        out_indices=(2, 3),
+        frozen_stages=1,
+        norm_cfg=dict(type='BN2d', requires_grad=False),
+        norm_eval=True,
+        style='caffe',
+        dcn=dict(type='DCNv2', deform_groups=1, fallback_on_stride=False), # original DCNv2 will print log when perform load_state_dict
+        stage_with_dcn=(False, False, True, True)),
+    img_neck=dict(
+        type='FPN',
+        in_channels=[1024, 2048],
+        out_channels=_dim_,
+        start_level=0,
+        add_extra_convs='on_output',
+        num_outs=_num_levels_,
+        relu_before_extra_convs=True),
+    pts_bbox_head=dict(
+        type='BEVFormerOccHead',
+        pc_range=point_cloud_range,
+        bev_h=bev_h_,
+        bev_w=bev_w_,
+        num_classes=18,
+        in_channels=_dim_,
+        sync_cls_avg_factor=True,
+        with_box_refine=True,
+        as_two_stage=False,
+        # loss_occ=dict(
+        #     type='FocalLoss',
+        #     use_sigmoid=False,
+        #     gamma=2.0,
+        #     alpha=0.25,
+        #     loss_weight=10.0),
+        use_mask=False,
+        loss_occ= dict(
+            type='CrossEntropyLoss',
+            use_sigmoid=False,
+            loss_weight=1.0),
+        transformer=dict(
+            type='TransformerOcc',
+            pillar_h=16,
+            num_classes=18,
+            norm_cfg=dict(type='BN', ),
+            norm_cfg_3d=dict(type='BN3d', ),
+            use_3d=True,
+            use_conv=False,
+            rotate_prev_bev=True,
+            use_shift=True,
+            use_can_bus=True,
+            embed_dims=_dim_,
+            encoder=dict(
+                type='BEVFormerEncoder',
+                num_layers=1,
+                pc_range=point_cloud_range,
+                num_points_in_pillar=8,
+                return_intermediate=False,
+                transformerlayers=dict(
+                    type='BEVFormerLayer',
+                    attn_cfgs=[
+                        dict(
+                            type='TemporalSelfAttention',
+                            embed_dims=_dim_,
+                            num_levels=1),
+                        dict(
+                            type='SpatialCrossAttention',
+                            pc_range=point_cloud_range,
+                            deformable_attention=dict(
+                                type='MSDeformableAttention3D',
+                                embed_dims=_dim_,
+                                num_points=8,
+                                num_levels=_num_levels_),
+                            embed_dims=_dim_,
+                        )
+                    ],
+                    feedforward_channels=_ffn_dim_,
+                    ffn_dropout=0.1,
+                    operation_order=('self_attn', 'norm', 'cross_attn', 'norm',
+                                     'ffn', 'norm'))),
+        ),
+        positional_encoding=dict(
+            type='LearnedPositionalEncoding',
+            num_feats=_pos_dim_,
+            row_num_embed=bev_h_,
+            col_num_embed=bev_w_,
+
+        ),
+    # model training and testing settings
+    train_cfg=dict(pts=dict(
+        grid_size=[512, 512, 1],
+        voxel_size=voxel_size,
+        point_cloud_range=point_cloud_range,
+        out_size_factor=4,
+        assigner=dict(
+            type='HungarianAssigner3D',
+            cls_cost=dict(type='FocalLossCost', weight=2.0),
+            reg_cost=dict(type='BBox3DL1Cost', weight=0.25),
+            iou_cost=dict(type='IoUCost', weight=0.0), # Fake cost. This is just to make it compatible with DETR head.
+            pc_range=point_cloud_range)))))
+
+dataset_type = 'NuSceneOcc'
+data_root = 'data/occ3d-nus/'
+file_client_args = dict(backend='disk')
+occ_gt_data_root='data/occ3d-nus'
+
+train_pipeline = [
+    dict(type='LoadMultiViewImageFromFiles', to_float32=True),
+    dict(type='LoadOccGTFromFile',data_root=occ_gt_data_root),
+    dict(type='PhotoMetricDistortionMultiViewImage'),
+    dict(type='LoadAnnotations3D', with_bbox_3d=True, with_label_3d=True, with_attr_label=False),
+    dict(type='RandomScaleImageMultiViewImage', scales=[0.2]),
+    dict(type='ObjectRangeFilter', point_cloud_range=point_cloud_range),
+    dict(type='ObjectNameFilter', classes=class_names),
+    dict(type='NormalizeMultiviewImage', **img_norm_cfg),
+    dict(type='PadMultiViewImage', size_divisor=32),
+    dict(type='DefaultFormatBundle3D', class_names=class_names),
+    dict(type='CustomCollect3D', keys=[ 'img','voxel_semantics','mask_lidar','mask_camera'] )
+]
+test_pipeline = [
+    dict(type='LoadMultiViewImageFromFiles', to_float32=True),
+    dict(type='LoadOccGTFromFile',data_root=occ_gt_data_root),
+    dict(type='NormalizeMultiviewImage', **img_norm_cfg),
+    dict(
+        type='MultiScaleFlipAug3D',
+        img_scale=(1600, 900),
+        pts_scale_ratio=1,
+        flip=False,
+        transforms=[
+        dict(type='RandomScaleImageMultiViewImage', scales=[0.8]),
+        dict(type='PadMultiViewImage', size_divisor=32),
+        dict(
+            type='DefaultFormatBundle3D',
+            class_names=class_names,
+            with_label=False),
+        dict(type='CustomCollect3D', keys=['img'])
+    ])
+]
+
+data = dict(
+    samples_per_gpu=1,
+    workers_per_gpu=0,
+    train=dict(
+        type=dataset_type,
+        data_root=data_root,
+        ann_file=data_root + 'occ_infos_temporal_train.pkl',
+        pipeline=train_pipeline,
+        classes=class_names,
+        modality=input_modality,
+        test_mode=False,
+        use_valid_flag=True,
+        bev_size=(bev_h_, bev_w_),
+        queue_length=queue_length,
+        # 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'),
+    val=dict(type=dataset_type,
+             data_root=data_root,
+             ann_file=data_root + 'occ_infos_temporal_val.pkl',
+             pipeline=test_pipeline,  bev_size=(bev_h_, bev_w_),
+             classes=class_names, modality=input_modality, samples_per_gpu=1),
+    test=dict(type=dataset_type,
+              data_root=data_root,
+
+              ann_file=data_root + 'occ_infos_temporal_val.pkl',
+              pipeline=test_pipeline, bev_size=(bev_h_, bev_w_),
+              classes=class_names, modality=input_modality),
+    shuffler_sampler=dict(type='DistributedGroupSampler'),
+    nonshuffler_sampler=dict(type='DistributedSampler')
+)
+optimizer = dict(
+    type='AdamW',
+    lr=2e-4,
+    paramwise_cfg=dict(
+        custom_keys={
+            'img_backbone': dict(lr_mult=0.1),
+        }),
+    weight_decay=0.01)
+
+optimizer_config = dict(grad_clip=dict(max_norm=35, norm_type=2))
+# learning policy
+lr_config = dict(
+    policy='CosineAnnealing',
+    warmup='linear',
+    warmup_iters=500,
+    warmup_ratio=1.0 / 3,
+    min_lr_ratio=1e-3)
+total_epochs = 24
+evaluation = dict(interval=1, pipeline=test_pipeline)
+
+runner = dict(type='EpochBasedRunner', max_epochs=total_epochs)
+# load_from = 'ckpts/r101_dcn_fcos3d_pretrain.pth'
+log_config = dict(
+    interval=50,
+    hooks=[
+        dict(type='TextLoggerHook'),
+        dict(type='TensorboardLoggerHook')
+    ])
+
+checkpoint_config = dict(interval=1)

autonomous_driving/occupancy_prediction/projects/mmdet3d_plugin/__init__.py

+from .core.bbox.assigners.hungarian_assigner_3d import HungarianAssigner3D
+from .core.bbox.coders.nms_free_coder import NMSFreeCoder
+from .core.bbox.match_costs import BBox3DL1Cost
+from .core.evaluation.eval_hooks import CustomDistEvalHook
+from .datasets.pipelines import (
+  PhotoMetricDistortionMultiViewImage, PadMultiViewImage, 
+  NormalizeMultiviewImage,  CustomCollect3D)
+from .models.backbones.vovnet import VoVNet
+from .models.utils import *
+from .models.opt.adamw import AdamW2
+from .bevformer import *