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region_layer.py
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region_layer.py
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import math
import numpy as np
import sys
import time
import torch
import torch.nn as nn
import torch.nn.functional as F
from utils import bbox_iou, multi_bbox_ious, convert2cpu
class RegionLayer(nn.Module):
def __init__(self, num_classes=0, anchors=[], num_anchors=1, use_cuda=None):
super(RegionLayer, self).__init__()
use_cuda = torch.cuda.is_available() and (True if use_cuda is None else use_cuda)
self.device = torch.device("cuda" if use_cuda else "cpu")
self.num_classes = num_classes
self.num_anchors = num_anchors
self.anchor_step = len(anchors)//num_anchors
#self.anchors = torch.stack(torch.FloatTensor(anchors).split(self.anchor_step)).to(self.device)
self.anchors = torch.FloatTensor(anchors).view(self.num_anchors, self.anchor_step).to(self.device)
self.rescore = 1
self.coord_scale = 1
self.noobject_scale = 1
self.object_scale = 5
self.class_scale = 1
self.thresh = 0.6
self.seen = 0
def build_targets(self, pred_boxes, target, nH, nW):
nB = target.size(0)
nA = self.num_anchors
conf_mask = torch.ones (nB, nA, nH, nW) * self.noobject_scale
coord_mask = torch.zeros(nB, nA, nH, nW)
cls_mask = torch.zeros(nB, nA, nH, nW)
tcoord = torch.zeros( 4, 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
nGT = 0 # number of ground truth
nRecall = 0
# it works faster on CPU than on GPU.
anchors = self.anchors.to("cpu")
if self.seen < 12800:
tcoord[0].fill_(0.5)
tcoord[1].fill_(0.5)
coord_mask.fill_(1)
for b in range(nB):
cur_pred_boxes = pred_boxes[b*nAnchors:(b+1)*nAnchors].t()
cur_ious = torch.zeros(nAnchors)
tbox = target[b].view(-1,5).to("cpu")
for t in range(50):
if tbox[t][1] == 0:
break
gx, gw = [ i * nW for i in (tbox[t][1], tbox[t][3]) ]
gy, gh = [ i * nH for i in (tbox[t][2], tbox[t][4]) ]
cur_gt_boxes = torch.FloatTensor([gx, gy, gw, gh]).repeat(nAnchors,1).t()
cur_ious = torch.max(cur_ious, multi_bbox_ious(cur_pred_boxes, cur_gt_boxes, x1y1x2y2=False))
ignore_ix = cur_ious>self.thresh
conf_mask[b][ignore_ix.view(nA,nH,nW)] = 0
for t in range(50):
if tbox[t][1] == 0:
break
nGT += 1
gx, gw = [ i * nW for i in (tbox[t][1], tbox[t][3]) ]
gy, gh = [ i * nH for i in (tbox[t][2], tbox[t][4]) ]
gw, gh = gw.float(), gh.float()
gi, gj = int(gx), int(gy)
tmp_gt_boxes = torch.FloatTensor([0, 0, gw, gh]).repeat(nA,1).t()
anchor_boxes = torch.cat((torch.zeros(nA, 2), anchors),1).t()
tmp_ious = multi_bbox_ious(tmp_gt_boxes, anchor_boxes, x1y1x2y2=False)
best_iou, best_n = torch.max(tmp_ious, 0)
if self.anchor_step == 4: # this part is not tested.
tmp_ious_mask = (tmp_ious==best_iou)
if tmp_ious_mask.sum() > 0:
gt_pos = torch.FloatTensor([gi, gj, gx, gy]).repeat(nA,1).t()
an_pos = anchor_boxes[4:6] # anchor_boxes are consisted of [0 0 aw ah ax ay]
dist = pow(((gt_pos[0]+an_pos[0])-gt_pos[2]),2) + pow(((gt_pos[1]+an_pos[1])-gt_pos[3]),2)
dist[1-tmp_ious_mask]=10000 # set the large number for the small ious
_, best_n = torch.min(dist,0)
gt_box = torch.FloatTensor([gx, gy, gw, gh])
pred_box = pred_boxes[b*nAnchors+best_n*nPixels+gj*nW+gi]
iou = bbox_iou(gt_box, pred_box, x1y1x2y2=False)
coord_mask[b][best_n][gj][gi] = 1
cls_mask [b][best_n][gj][gi] = 1
conf_mask [b][best_n][gj][gi] = self.object_scale
tcoord [0][b][best_n][gj][gi] = gx - gi
tcoord [1][b][best_n][gj][gi] = gy - gj
tcoord [2][b][best_n][gj][gi] = math.log(gw/anchors[best_n][0])
tcoord [3][b][best_n][gj][gi] = math.log(gh/anchors[best_n][1])
tcls [b][best_n][gj][gi] = tbox[t][0]
tconf [b][best_n][gj][gi] = iou if self.rescore else 1.
if iou > 0.5:
nRecall += 1
return nGT, nRecall, coord_mask, conf_mask, cls_mask, tcoord, tconf, tcls
def get_mask_boxes(self, output):
if not isinstance(self.anchors, torch.Tensor):
self.anchors = torch.FloatTensor(self.anchors).view(self.num_anchors, self.anchor_step).to(self.device)
masked_anchors = self.anchors.view(-1)
num_anchors = torch.IntTensor([self.num_anchors]).to(self.device)
return {'x':output, 'a':masked_anchors, 'n':num_anchors}
def forward(self, output, target):
#output : BxAs*(4+1+num_classes)*H*W
t0 = time.time()
nB = output.data.size(0) # batch size
nA = self.num_anchors
nC = self.num_classes
nH = output.data.size(2)
nW = output.data.size(3)
cls_anchor_dim = nB*nA*nH*nW
if not isinstance(self.anchors, torch.Tensor):
self.anchors = torch.FloatTensor(self.anchors).view(self.num_anchors, self.anchor_step).to(self.device)
output = output.view(nB, nA, (5+nC), nH, nW)
cls_grid = torch.linspace(5,5+nC-1,nC).long().to(self.device)
ix = torch.LongTensor(range(0,5)).to(self.device)
pred_boxes = torch.FloatTensor(4, cls_anchor_dim).to(self.device)
coord = output.index_select(2, ix[0:4]).view(nB*nA, -1, nH*nW).transpose(0,1).contiguous().view(-1,cls_anchor_dim) # x, y, w, h
coord[0:2] = coord[0:2].sigmoid() # x, y
conf = output.index_select(2, ix[4]).view(nB, nA, nH, nW).sigmoid()
cls = output.index_select(2, cls_grid)
cls = cls.view(nB*nA, nC, nH*nW).transpose(1,2).contiguous().view(cls_anchor_dim, nC)
t1 = time.time()
grid_x = torch.linspace(0, nW-1, nW).repeat(nB*nA, nH, 1).view(cls_anchor_dim).to(self.device)
grid_y = torch.linspace(0, nH-1, nH).repeat(nW,1).t().repeat(nB*nA, 1, 1).view(cls_anchor_dim).to(self.device)
anchor_w = self.anchors.index_select(1, ix[0]).repeat(1, nB*nH*nW).view(cls_anchor_dim)
anchor_h = self.anchors.index_select(1, ix[1]).repeat(1, nB*nH*nW).view(cls_anchor_dim)
pred_boxes[0] = coord[0] + grid_x
pred_boxes[1] = coord[1] + grid_y
pred_boxes[2] = coord[2].exp() * anchor_w
pred_boxes[3] = coord[3].exp() * anchor_h
# for build_targets. it works faster on CPU than on GPU
pred_boxes = convert2cpu(pred_boxes.transpose(0,1).contiguous().view(-1,4)).detach()
t2 = time.time()
nGT, nRecall, coord_mask, conf_mask, cls_mask, tcoord, tconf, tcls = \
self.build_targets(pred_boxes, target.detach(), nH, nW)
cls_mask = (cls_mask == 1)
tcls = tcls[cls_mask].long().view(-1)
cls_mask = cls_mask.view(-1, 1).repeat(1,nC).to(self.device)
cls = cls[cls_mask].view(-1, nC)
nProposals = int((conf > 0.25).sum())
tcoord = tcoord.view(4, cls_anchor_dim).to(self.device)
tconf, tcls = tconf.to(self.device), tcls.to(self.device)
coord_mask, conf_mask = coord_mask.view(cls_anchor_dim).to(self.device), conf_mask.sqrt().to(self.device)
t3 = time.time()
loss_coord = self.coord_scale * nn.MSELoss(size_average=False)(coord*coord_mask, tcoord*coord_mask)/2
# sqrt(object_scale)/2 is almost equal to 1.
loss_conf = nn.MSELoss(size_average=False)(conf*conf_mask, tconf*conf_mask)/2
loss_cls = self.class_scale * nn.CrossEntropyLoss(size_average=False)(cls, tcls) if cls.size(0) > 0 else 0
loss = loss_coord + loss_conf + loss_cls
t4 = time.time()
if False:
print('-'*30)
print(' activation : %f' % (t1 - t0))
print(' create pred_boxes : %f' % (t2 - t1))
print(' build targets : %f' % (t3 - t2))
print(' create loss : %f' % (t4 - t3))
print(' total : %f' % (t4 - t0))
print('%d: nGT %3d, nRC %3d, nPP %3d, loss: box %6.3f, conf %6.3f, class %6.3f, total %7.3f'
% (self.seen, nGT, nRecall, nProposals, loss_coord, loss_conf, loss_cls, loss))
if math.isnan(loss.item()):
print(conf, tconf)
sys.exit(0)
return loss