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agent.py
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agent.py
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#########################################################################
##
## train agent that has some utility for training and saving.
##
#########################################################################
import torch.nn as nn
import torch
from util_hourglass import *
from copy import deepcopy
import numpy as np
from torch.autograd import Variable
from hourglass_network import lane_detection_network
from torch.autograd import Function as F
from parameters import Parameters
import math
import util
############################################################
##
## agent for lane detection
##
############################################################
class Agent(nn.Module):
#####################################################
## Initialize
#####################################################
def __init__(self):
super(Agent, self).__init__()
self.p = Parameters()
self.lane_detection_network = lane_detection_network()
self.setup_optimizer()
self.current_epoch = 0
def count_parameters(self, model):
return sum(p.numel() for p in model.parameters() if p.requires_grad)
def setup_optimizer(self):
self.lane_detection_optim = torch.optim.Adam(self.lane_detection_network.parameters(),
lr=self.p.l_rate,
weight_decay=self.p.weight_decay)
#####################################################
## Make ground truth for key point estimation
#####################################################
def make_ground_truth_point(self, target_lanes, target_h):
target_lanes, target_h = util.sort_batch_along_y(target_lanes, target_h)
ground = np.zeros((len(target_lanes), 3, self.p.grid_y, self.p.grid_x))
ground_binary = np.zeros((len(target_lanes), 1, self.p.grid_y, self.p.grid_x))
for batch_index, batch in enumerate(target_lanes):
for lane_index, lane in enumerate(batch):
for point_index, point in enumerate(lane):
if point > 0:
x_index = int(point/self.p.resize_ratio)
y_index = int(target_h[batch_index][lane_index][point_index]/self.p.resize_ratio)
ground[batch_index][0][y_index][x_index] = 1.0
ground[batch_index][1][y_index][x_index]= (point*1.0/self.p.resize_ratio) - x_index
ground[batch_index][2][y_index][x_index] = (target_h[batch_index][lane_index][point_index]*1.0/self.p.resize_ratio) - y_index
ground_binary[batch_index][0][y_index][x_index] = 1
return ground, ground_binary
#####################################################
## Make ground truth for instance feature
#####################################################
def make_ground_truth_instance(self, target_lanes, target_h):
ground = np.zeros((len(target_lanes), 1, self.p.grid_y*self.p.grid_x, self.p.grid_y*self.p.grid_x))
for batch_index, batch in enumerate(target_lanes):
temp = np.zeros((1, self.p.grid_y, self.p.grid_x))
lane_cluster = 1
for lane_index, lane in enumerate(batch):
previous_x_index = 0
previous_y_index = 0
for point_index, point in enumerate(lane):
if point > 0:
x_index = int(point/self.p.resize_ratio)
y_index = int(target_h[batch_index][lane_index][point_index]/self.p.resize_ratio)
temp[0][y_index][x_index] = lane_cluster
if previous_x_index != 0 or previous_y_index != 0: #interpolation make more dense data
temp_x = previous_x_index
temp_y = previous_y_index
while True:
delta_x = 0
delta_y = 0
temp[0][temp_y][temp_x] = lane_cluster
if temp_x < x_index:
temp[0][temp_y][temp_x+1] = lane_cluster
delta_x = 1
elif temp_x > x_index:
temp[0][temp_y][temp_x-1] = lane_cluster
delta_x = -1
if temp_y < y_index:
temp[0][temp_y+1][temp_x] = lane_cluster
delta_y = 1
elif temp_y > y_index:
temp[0][temp_y-1][temp_x] = lane_cluster
delta_y = -1
temp_x += delta_x
temp_y += delta_y
if temp_x == x_index and temp_y == y_index:
break
if point > 0:
previous_x_index = x_index
previous_y_index = y_index
lane_cluster += 1
for i in range(self.p.grid_y*self.p.grid_x): #make gt
temp = temp[temp>-1]
gt_one = deepcopy(temp)
if temp[i]>0:
gt_one[temp==temp[i]] = 1 #same instance
if temp[i] == 0:
gt_one[temp!=temp[i]] = 3 #different instance, different class
else:
gt_one[temp!=temp[i]] = 2 #different instance, same class
gt_one[temp==0] = 3 #different instance, different class
ground[batch_index][0][i] += gt_one
return ground
#####################################################
## train
#####################################################
def train(self, inputs, target_lanes, target_h, epoch, agent):
point_loss = self.train_point(inputs, target_lanes, target_h, epoch)
return point_loss
#####################################################
## compute loss function and optimize
#####################################################
def train_point(self, inputs, target_lanes, target_h, epoch):
real_batch_size = len(target_lanes)
#generate ground truth
ground_truth_point, ground_binary = self.make_ground_truth_point(target_lanes, target_h)
ground_truth_instance = self.make_ground_truth_instance(target_lanes, target_h)
# convert numpy array to torch tensor
ground_truth_point = torch.from_numpy(ground_truth_point).float()
ground_truth_point = Variable(ground_truth_point).cuda()
ground_truth_point.requires_grad=False
ground_binary = torch.LongTensor(ground_binary.tolist()).cuda()
ground_binary.requires_grad=False
ground_truth_instance = torch.from_numpy(ground_truth_instance).float()
ground_truth_instance = Variable(ground_truth_instance).cuda()
ground_truth_instance.requires_grad=False
#util.visualize_gt(ground_truth_point[0], ground_truth_instance[0], inputs[0])
# update lane_detection_network
result = self.predict_lanes(inputs)
lane_detection_loss = 0
for (confidance, offset, feature) in result:
#compute loss for point prediction
offset_loss = 0
exist_condidence_loss = 0
nonexist_confidence_loss = 0
#exist confidance loss
confidance_gt = ground_truth_point[:, 0, :, :]
confidance_gt = confidance_gt.view(real_batch_size, 1, self.p.grid_y, self.p.grid_x)
exist_condidence_loss = torch.sum( (confidance_gt[confidance_gt==1] - confidance[confidance_gt==1])**2 )/torch.sum(confidance_gt==1)
#non exist confidance loss
nonexist_confidence_loss = torch.sum( (confidance_gt[confidance_gt==0] - confidance[confidance_gt==0])**2 )/torch.sum(confidance_gt==0)
#offset loss
offset_x_gt = ground_truth_point[:, 1:2, :, :]
offset_y_gt = ground_truth_point[:, 2:3, :, :]
predict_x = offset[:, 0:1, :, :]
predict_y = offset[:, 1:2, :, :]
x_offset_loss = torch.sum( (offset_x_gt[confidance_gt==1] - predict_x[confidance_gt==1])**2 )/torch.sum(confidance_gt==1)
y_offset_loss = torch.sum( (offset_y_gt[confidance_gt==1] - predict_y[confidance_gt==1])**2 )/torch.sum(confidance_gt==1)
offset_loss = (x_offset_loss + y_offset_loss)/2
#compute loss for similarity
sisc_loss = 0
disc_loss = 0
feature_map = feature.view(real_batch_size, self.p.feature_size, 1, self.p.grid_y*self.p.grid_x)
feature_map = feature_map.expand(real_batch_size, self.p.feature_size, self.p.grid_y*self.p.grid_x, self.p.grid_y*self.p.grid_x).detach()
point_feature = feature.view(real_batch_size, self.p.feature_size, self.p.grid_y*self.p.grid_x,1)
point_feature = point_feature.expand(real_batch_size, self.p.feature_size, self.p.grid_y*self.p.grid_x, self.p.grid_y*self.p.grid_x)#.detach()
distance_map = (feature_map-point_feature)**2
distance_map = torch.norm( distance_map, dim=1 ).view(real_batch_size, 1, self.p.grid_y*self.p.grid_x, self.p.grid_y*self.p.grid_x)
# same instance
sisc_loss = torch.sum(distance_map[ground_truth_instance==1])/torch.sum(ground_truth_instance==1)
# different instance, same class
disc_loss = self.p.K1-distance_map[ground_truth_instance==2] #self.p.K1/distance_map[ground_truth_instance==2] + (self.p.K1-distance_map[ground_truth_instance==2])
disc_loss[disc_loss<0] = 0
disc_loss = torch.sum(disc_loss)/torch.sum(ground_truth_instance==2)
print("seg loss################################################################")
print(sisc_loss)
print(disc_loss)
print("point loss")
print(exist_condidence_loss)
print(nonexist_confidence_loss)
print(offset_loss)
print("lane loss")
lane_loss = self.p.constant_exist*exist_condidence_loss + self.p.constant_nonexist*nonexist_confidence_loss + self.p.constant_offset*offset_loss
print(lane_loss)
print("instance loss")
instance_loss = self.p.constant_alpha*sisc_loss + self.p.constant_beta*disc_loss
print(instance_loss)
lane_detection_loss = lane_detection_loss + self.p.constant_lane_loss*lane_loss + self.p.constant_instance_loss*instance_loss
self.lane_detection_optim.zero_grad()
lane_detection_loss.backward()
self.lane_detection_optim.step()
del confidance, offset, feature
del ground_truth_point, ground_binary, ground_truth_instance
del feature_map, point_feature, distance_map
del exist_condidence_loss, nonexist_confidence_loss, offset_loss, sisc_loss, disc_loss, lane_loss, instance_loss
if epoch>0 and epoch%20==0 and self.current_epoch != epoch:
self.current_epoch = epoch
if epoch>0 and (epoch == 1000):
self.p.constant_lane_loss += 0.5
self.p.constant_nonexist += 0.5
self.p.l_rate /= 2.0
self.setup_optimizer()
return lane_detection_loss
#####################################################
## predict lanes
#####################################################
def predict_lanes(self, inputs):
inputs = torch.from_numpy(inputs).float()
inputs = Variable(inputs).cuda()
return self.lane_detection_network(inputs)
#####################################################
## predict lanes in test
#####################################################
def predict_lanes_test(self, inputs):
inputs = torch.from_numpy(inputs).float()
inputs = Variable(inputs).cuda()
return self.lane_detection_network(inputs)
#####################################################
## Training mode
#####################################################
def training_mode(self):
self.lane_detection_network.train()
#####################################################
## evaluate(test mode)
#####################################################
def evaluate_mode(self):
self.lane_detection_network.eval()
#####################################################
## Setup GPU computation
#####################################################
def cuda(self):
self.lane_detection_network.cuda()
#####################################################
## Load save file
#####################################################
def load_weights(self, epoch, loss):
self.lane_detection_network.load_state_dict(
torch.load(self.p.model_path+str(epoch)+'_'+str(loss)+'_'+'lane_detection_network.pkl')
)
#####################################################
## Save model
#####################################################
def save_model(self, epoch, loss):
torch.save(
self.lane_detection_network.state_dict(),
self.p.save_path+str(epoch)+'_'+str(loss)+'_'+'lane_detection_network.pkl'
)