in py2/region_loss.py [0:0]
def build_targets(pred_corners, target, anchors, num_anchors, num_classes, nH, nW, noobject_scale, object_scale, sil_thresh, seen):
nB = target.size(0)
nA = num_anchors
nC = num_classes
anchor_step = len(anchors)/num_anchors
conf_mask = torch.ones(nB, nA, nH, nW) * noobject_scale
coord_mask = torch.zeros(nB, nA, nH, nW)
cls_mask = torch.zeros(nB, nA, nH, nW)
tx0 = torch.zeros(nB, nA, nH, nW)
ty0 = torch.zeros(nB, nA, nH, nW)
tx1 = torch.zeros(nB, nA, nH, nW)
ty1 = torch.zeros(nB, nA, nH, nW)
tx2 = torch.zeros(nB, nA, nH, nW)
ty2 = torch.zeros(nB, nA, nH, nW)
tx3 = torch.zeros(nB, nA, nH, nW)
ty3 = torch.zeros(nB, nA, nH, nW)
tx4 = torch.zeros(nB, nA, nH, nW)
ty4 = torch.zeros(nB, nA, nH, nW)
tx5 = torch.zeros(nB, nA, nH, nW)
ty5 = torch.zeros(nB, nA, nH, nW)
tx6 = torch.zeros(nB, nA, nH, nW)
ty6 = torch.zeros(nB, nA, nH, nW)
tx7 = torch.zeros(nB, nA, nH, nW)
ty7 = torch.zeros(nB, nA, nH, nW)
tx8 = torch.zeros(nB, nA, nH, nW)
ty8 = torch.zeros(nB, nA, nH, nW)
tconf = torch.zeros(nB, nA, nH, nW)
tcls = torch.zeros(nB, nA, nH, nW)
nAnchors = nA*nH*nW
nPixels = nH*nW
for b in range(nB):
cur_pred_corners = pred_corners[b*nAnchors:(b+1)*nAnchors].t()
cur_confs = torch.zeros(nAnchors)
for t in range(50):
if target[b][t*21+1] == 0:
break
gx0 = target[b][t*21+1]*nW
gy0 = target[b][t*21+2]*nH
gx1 = target[b][t*21+3]*nW
gy1 = target[b][t*21+4]*nH
gx2 = target[b][t*21+5]*nW
gy2 = target[b][t*21+6]*nH
gx3 = target[b][t*21+7]*nW
gy3 = target[b][t*21+8]*nH
gx4 = target[b][t*21+9]*nW
gy4 = target[b][t*21+10]*nH
gx5 = target[b][t*21+11]*nW
gy5 = target[b][t*21+12]*nH
gx6 = target[b][t*21+13]*nW
gy6 = target[b][t*21+14]*nH
gx7 = target[b][t*21+15]*nW
gy7 = target[b][t*21+16]*nH
gx8 = target[b][t*21+17]*nW
gy8 = target[b][t*21+18]*nH
cur_gt_corners = torch.FloatTensor([gx0/nW,gy0/nH,gx1/nW,gy1/nH,gx2/nW,gy2/nH,gx3/nW,gy3/nH,gx4/nW,gy4/nH,gx5/nW,gy5/nH,gx6/nW,gy6/nH,gx7/nW,gy7/nH,gx8/nW,gy8/nH]).repeat(nAnchors,1).t() # 16 x nAnchors
cur_confs = torch.max(cur_confs, corner_confidences9(cur_pred_corners, cur_gt_corners)) # some irrelevant areas are filtered, in the same grid multiple anchor boxes might exceed the threshold
conf_mask[b][cur_confs>sil_thresh] = 0
if seen < -1:#6400:
tx0.fill_(0.5)
ty0.fill_(0.5)
tx1.fill_(0.5)
ty1.fill_(0.5)
tx2.fill_(0.5)
ty2.fill_(0.5)
tx3.fill_(0.5)
ty3.fill_(0.5)
tx4.fill_(0.5)
ty4.fill_(0.5)
tx5.fill_(0.5)
ty5.fill_(0.5)
tx6.fill_(0.5)
ty6.fill_(0.5)
tx7.fill_(0.5)
ty7.fill_(0.5)
tx8.fill_(0.5)
ty8.fill_(0.5)
coord_mask.fill_(1)
nGT = 0
nCorrect = 0
for b in range(nB):
for t in range(50):
if target[b][t*21+1] == 0:
break
nGT = nGT + 1
best_iou = 0.0
best_n = -1
min_dist = 10000
gx0 = target[b][t*21+1] * nW
gy0 = target[b][t*21+2] * nH
gi0 = int(gx0)
gj0 = int(gy0)
gx1 = target[b][t*21+3] * nW
gy1 = target[b][t*21+4] * nH
gx2 = target[b][t*21+5] * nW
gy2 = target[b][t*21+6] * nH
gx3 = target[b][t*21+7] * nW
gy3 = target[b][t*21+8] * nH
gx4 = target[b][t*21+9] * nW
gy4 = target[b][t*21+10] * nH
gx5 = target[b][t*21+11] * nW
gy5 = target[b][t*21+12] * nH
gx6 = target[b][t*21+13] * nW
gy6 = target[b][t*21+14] * nH
gx7 = target[b][t*21+15] * nW
gy7 = target[b][t*21+16] * nH
gx8 = target[b][t*21+17] * nW
gy8 = target[b][t*21+18] * nH
best_n = 0 # 1 anchor box
gt_box = [gx0/nW,gy0/nH,gx1/nW,gy1/nH,gx2/nW,gy2/nH,gx3/nW,gy3/nH,gx4/nW,gy4/nH,gx5/nW,gy5/nH,gx6/nW,gy6/nH,gx7/nW,gy7/nH,gx8/nW,gy8/nH]
pred_box = pred_corners[b*nAnchors+best_n*nPixels+gj0*nW+gi0]
conf = corner_confidence9(gt_box, pred_box)
coord_mask[b][best_n][gj0][gi0] = 1
cls_mask[b][best_n][gj0][gi0] = 1
conf_mask[b][best_n][gj0][gi0] = object_scale
tx0[b][best_n][gj0][gi0] = target[b][t*21+1] * nW - gi0
ty0[b][best_n][gj0][gi0] = target[b][t*21+2] * nH - gj0
tx1[b][best_n][gj0][gi0] = target[b][t*21+3] * nW - gi0
ty1[b][best_n][gj0][gi0] = target[b][t*21+4] * nH - gj0
tx2[b][best_n][gj0][gi0] = target[b][t*21+5] * nW - gi0
ty2[b][best_n][gj0][gi0] = target[b][t*21+6] * nH - gj0
tx3[b][best_n][gj0][gi0] = target[b][t*21+7] * nW - gi0
ty3[b][best_n][gj0][gi0] = target[b][t*21+8] * nH - gj0
tx4[b][best_n][gj0][gi0] = target[b][t*21+9] * nW - gi0
ty4[b][best_n][gj0][gi0] = target[b][t*21+10] * nH - gj0
tx5[b][best_n][gj0][gi0] = target[b][t*21+11] * nW - gi0
ty5[b][best_n][gj0][gi0] = target[b][t*21+12] * nH - gj0
tx6[b][best_n][gj0][gi0] = target[b][t*21+13] * nW - gi0
ty6[b][best_n][gj0][gi0] = target[b][t*21+14] * nH - gj0
tx7[b][best_n][gj0][gi0] = target[b][t*21+15] * nW - gi0
ty7[b][best_n][gj0][gi0] = target[b][t*21+16] * nH - gj0
tx8[b][best_n][gj0][gi0] = target[b][t*21+17] * nW - gi0
ty8[b][best_n][gj0][gi0] = target[b][t*21+18] * nH - gj0
tconf[b][best_n][gj0][gi0] = conf
tcls[b][best_n][gj0][gi0] = target[b][t*21]
if conf > 0.5:
nCorrect = nCorrect + 1
return nGT, nCorrect, coord_mask, conf_mask, cls_mask, tx0, tx1, tx2, tx3, tx4, tx5, tx6, tx7, tx8, ty0, ty1, ty2, ty3, ty4, ty5, ty6, ty7, ty8, tconf, tcls