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Add support for TransFusion-Lidar Head
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pcdet/models/dense_heads/target_assigner/hungarian_assigner.py
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import torch | ||
from scipy.optimize import linear_sum_assignment | ||
from pcdet.ops.iou3d_nms import iou3d_nms_cuda | ||
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def height_overlaps(boxes1, boxes2): | ||
""" | ||
Calculate height overlaps of two boxes. | ||
""" | ||
boxes1_top_height = (boxes1[:,2]+ boxes1[:,5]).view(-1, 1) | ||
boxes1_bottom_height = boxes1[:,2].view(-1, 1) | ||
boxes2_top_height = (boxes2[:,2]+boxes2[:,5]).view(1, -1) | ||
boxes2_bottom_height = boxes2[:,2].view(1, -1) | ||
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heighest_of_bottom = torch.max(boxes1_bottom_height, boxes2_bottom_height) | ||
lowest_of_top = torch.min(boxes1_top_height, boxes2_top_height) | ||
overlaps_h = torch.clamp(lowest_of_top - heighest_of_bottom, min=0) | ||
return overlaps_h | ||
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def overlaps(boxes1, boxes2): | ||
""" | ||
Calculate 3D overlaps of two boxes. | ||
""" | ||
rows = len(boxes1) | ||
cols = len(boxes2) | ||
if rows * cols == 0: | ||
return boxes1.new(rows, cols) | ||
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# height overlap | ||
overlaps_h = height_overlaps(boxes1, boxes2) | ||
boxes1_bev = boxes1[:,:7] | ||
boxes2_bev = boxes2[:,:7] | ||
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# bev overlap | ||
overlaps_bev = boxes1_bev.new_zeros( | ||
(boxes1_bev.shape[0], boxes2_bev.shape[0]) | ||
).cuda() # (N, M) | ||
iou3d_nms_cuda.boxes_overlap_bev_gpu( | ||
boxes1_bev.contiguous().cuda(), boxes2_bev.contiguous().cuda(), overlaps_bev | ||
) | ||
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# 3d overlaps | ||
overlaps_3d = overlaps_bev.to(boxes1.device) * overlaps_h | ||
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volume1 = (boxes1[:, 3] * boxes1[:, 4] * boxes1[:, 5]).view(-1, 1) | ||
volume2 = (boxes2[:, 3] * boxes2[:, 4] * boxes2[:, 5]).view(1, -1) | ||
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iou3d = overlaps_3d / torch.clamp(volume1 + volume2 - overlaps_3d, min=1e-8) | ||
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return iou3d | ||
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class HungarianAssigner3D: | ||
def __init__(self, cls_cost, reg_cost, iou_cost): | ||
self.cls_cost = cls_cost | ||
self.reg_cost = reg_cost | ||
self.iou_cost = iou_cost | ||
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def focal_loss_cost(self, cls_pred, gt_labels): | ||
weight = self.cls_cost.get('weight', 0.15) | ||
alpha = self.cls_cost.get('alpha', 0.25) | ||
gamma = self.cls_cost.get('gamma', 2.0) | ||
eps = self.cls_cost.get('eps', 1e-12) | ||
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cls_pred = cls_pred.sigmoid() | ||
neg_cost = -(1 - cls_pred + eps).log() * ( | ||
1 - alpha) * cls_pred.pow(gamma) | ||
pos_cost = -(cls_pred + eps).log() * alpha * ( | ||
1 - cls_pred).pow(gamma) | ||
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cls_cost = pos_cost[:, gt_labels] - neg_cost[:, gt_labels] | ||
return cls_cost * weight | ||
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def bevbox_cost(self, bboxes, gt_bboxes, point_cloud_range): | ||
weight = self.reg_cost.get('weight', 0.25) | ||
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pc_start = bboxes.new(point_cloud_range[0:2]) | ||
pc_range = bboxes.new(point_cloud_range[3:5]) - bboxes.new(point_cloud_range[0:2]) | ||
# normalize the box center to [0, 1] | ||
normalized_bboxes_xy = (bboxes[:, :2] - pc_start) / pc_range | ||
normalized_gt_bboxes_xy = (gt_bboxes[:, :2] - pc_start) / pc_range | ||
reg_cost = torch.cdist(normalized_bboxes_xy, normalized_gt_bboxes_xy, p=1) | ||
return reg_cost * weight | ||
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def iou3d_cost(self, bboxes, gt_bboxes): | ||
iou = overlaps(bboxes, gt_bboxes) | ||
weight = self.iou_cost.get('weight', 0.25) | ||
iou_cost = - iou | ||
return iou_cost * weight, iou | ||
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def assign(self, bboxes, gt_bboxes, gt_labels, cls_pred, point_cloud_range): | ||
num_gts, num_bboxes = gt_bboxes.size(0), bboxes.size(0) | ||
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# 1. assign -1 by default | ||
assigned_gt_inds = bboxes.new_full((num_bboxes,), -1, dtype=torch.long) | ||
assigned_labels = bboxes.new_full((num_bboxes,), -1, dtype=torch.long) | ||
if num_gts == 0 or num_bboxes == 0: | ||
# No ground truth or boxes, return empty assignment | ||
if num_gts == 0: | ||
# No ground truth, assign all to background | ||
assigned_gt_inds[:] = 0 | ||
return num_gts, assigned_gt_inds, max_overlaps, assigned_labels | ||
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# 2. compute the weighted costs | ||
cls_cost = self.focal_loss_cost(cls_pred[0].T, gt_labels) | ||
reg_cost = self.bevbox_cost(bboxes, gt_bboxes, point_cloud_range) | ||
iou_cost, iou = self.iou3d_cost(bboxes, gt_bboxes) | ||
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# weighted sum of above three costs | ||
cost = cls_cost + reg_cost + iou_cost | ||
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# 3. do Hungarian matching on CPU using linear_sum_assignment | ||
cost = cost.detach().cpu() | ||
matched_row_inds, matched_col_inds = linear_sum_assignment(cost) | ||
matched_row_inds = torch.from_numpy(matched_row_inds).to(bboxes.device) | ||
matched_col_inds = torch.from_numpy(matched_col_inds).to(bboxes.device) | ||
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# 4. assign backgrounds and foregrounds | ||
# assign all indices to backgrounds first | ||
assigned_gt_inds[:] = 0 | ||
# assign foregrounds based on matching results | ||
assigned_gt_inds[matched_row_inds] = matched_col_inds + 1 | ||
assigned_labels[matched_row_inds] = gt_labels[matched_col_inds] | ||
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max_overlaps = torch.zeros_like(iou.max(1).values) | ||
max_overlaps[matched_row_inds] = iou[matched_row_inds, matched_col_inds] | ||
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return assigned_gt_inds, max_overlaps |
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