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import os
import torch
import matplotlib
matplotlib.use('Agg')
import scipy.signal
from matplotlib import pyplot as plt
from torch.utils.tensorboard import SummaryWriter
import shutil
import numpy as np
from PIL import Image
from tqdm import tqdm
from .utils import cvtColor, preprocess_input, resize_image
from .utils_bbox import BBoxUtility
from .utils_map import get_coco_map, get_map
class LossHistory():
def __init__(self, log_dir, model, input_shape):
self.log_dir = log_dir
self.losses = []
self.val_loss = []
os.makedirs(self.log_dir)
self.writer = SummaryWriter(self.log_dir)
try:
dummy_input = torch.randn(2, 3, input_shape[0], input_shape[1])
self.writer.add_graph(model, dummy_input)
except:
pass
def append_loss(self, epoch, loss, val_loss):
if not os.path.exists(self.log_dir):
os.makedirs(self.log_dir)
self.losses.append(loss)
self.val_loss.append(val_loss)
with open(os.path.join(self.log_dir, "epoch_loss.txt"), 'a') as f:
f.write(str(loss))
f.write("\n")
with open(os.path.join(self.log_dir, "epoch_val_loss.txt"), 'a') as f:
f.write(str(val_loss))
f.write("\n")
self.writer.add_scalar('loss', loss, epoch)
self.writer.add_scalar('val_loss', val_loss, epoch)
self.loss_plot()
def loss_plot(self):
iters = range(len(self.losses))
plt.figure()
plt.plot(iters, self.losses, 'red', linewidth = 2, label='train loss')
plt.plot(iters, self.val_loss, 'coral', linewidth = 2, label='val loss')
try:
if len(self.losses) < 25:
num = 5
else:
num = 15
plt.plot(iters, scipy.signal.savgol_filter(self.losses, num, 3), 'green', linestyle = '--', linewidth = 2, label='smooth train loss')
plt.plot(iters, scipy.signal.savgol_filter(self.val_loss, num, 3), '#8B4513', linestyle = '--', linewidth = 2, label='smooth val loss')
except:
pass
plt.grid(True)
plt.xlabel('Epoch')
plt.ylabel('Loss')
plt.legend(loc="upper right")
plt.savefig(os.path.join(self.log_dir, "epoch_loss.png"))
plt.cla()
plt.close("all")
class EvalCallback():
def __init__(self, net, input_shape, anchors, class_names, num_classes, val_lines, log_dir, cuda, \
map_out_path=".temp_map_out", max_boxes=100, confidence=0.05, nms_iou=0.5, letterbox_image=True, MINOVERLAP=0.5, eval_flag=True, period=1):
super(EvalCallback, self).__init__()
self.net = net
self.input_shape = input_shape
self.anchors = anchors
self.class_names = class_names
self.num_classes = num_classes
self.val_lines = val_lines
self.log_dir = log_dir
self.cuda = cuda
self.map_out_path = map_out_path
self.max_boxes = max_boxes
self.confidence = confidence
self.nms_iou = nms_iou
self.letterbox_image = letterbox_image
self.MINOVERLAP = MINOVERLAP
self.eval_flag = eval_flag
self.period = period
self.anchors = torch.from_numpy(self.anchors).type(torch.FloatTensor)
if self.cuda:
self.anchors = self.anchors.cuda()
self.bbox_util = BBoxUtility(self.num_classes)
self.maps = [0]
self.epoches = [0]
if self.eval_flag:
with open(os.path.join(self.log_dir, "epoch_map.txt"), 'a') as f:
f.write(str(0))
f.write("\n")
def get_map_txt(self, image_id, image, class_names, map_out_path):
f = open(os.path.join(map_out_path, "detection-results/"+image_id+".txt"),"w")
#---------------------------------------------------#
# 计算输入图片的高和宽
#---------------------------------------------------#
image_shape = np.array(np.shape(image)[0:2])
#---------------------------------------------------------#
# 在这里将图像转换成RGB图像，防止灰度图在预测时报错。
# 代码仅仅支持RGB图像的预测，所有其它类型的图像都会转化成RGB
#---------------------------------------------------------#
image = cvtColor(image)
#---------------------------------------------------------#
# 给图像增加灰条，实现不失真的resize
# 也可以直接resize进行识别
#---------------------------------------------------------#
image_data = resize_image(image, (self.input_shape[1], self.input_shape[0]), self.letterbox_image)
#---------------------------------------------------------#
# 添加上batch_size维度，图片预处理，归一化。
#---------------------------------------------------------#
image_data = np.expand_dims(np.transpose(preprocess_input(np.array(image_data, dtype='float32')), (2, 0, 1)), 0)
with torch.no_grad():
#---------------------------------------------------#
# 转化成torch的形式
#---------------------------------------------------#
images = torch.from_numpy(image_data).type(torch.FloatTensor)
if self.cuda:
images = images.cuda()
#---------------------------------------------------------#
# 将图像输入网络当中进行预测！
#---------------------------------------------------------#
outputs = self.net(images)
#-----------------------------------------------------------#
# 将预测结果进行解码
#-----------------------------------------------------------#
results = self.bbox_util.decode_box(outputs, self.anchors, image_shape, self.input_shape, self.letterbox_image,
nms_iou = self.nms_iou, confidence = self.confidence)
#--------------------------------------#
# 如果没有检测到物体，则返回原图
#--------------------------------------#
if len(results[0]) <= 0:
return
top_label = np.array(results[0][:, 4], dtype = 'int32')
top_conf = results[0][:, 5]
top_boxes = results[0][:, :4]
top_100 = np.argsort(top_conf)[::-1][:self.max_boxes]
top_boxes = top_boxes[top_100]
top_conf = top_conf[top_100]
top_label = top_label[top_100]
for i, c in list(enumerate(top_label)):
predicted_class = self.class_names[int(c)]
box = top_boxes[i]
score = str(top_conf[i])
top, left, bottom, right = box
if predicted_class not in class_names:
continue
f.write("%s %s %s %s %s %s\n" % (predicted_class, score[:6], str(int(left)), str(int(top)), str(int(right)),str(int(bottom))))
f.close()
return
def on_epoch_end(self, epoch, model_eval):
if epoch % self.period == 0 and self.eval_flag:
self.net = model_eval
if not os.path.exists(self.map_out_path):
os.makedirs(self.map_out_path)
if not os.path.exists(os.path.join(self.map_out_path, "ground-truth")):
os.makedirs(os.path.join(self.map_out_path, "ground-truth"))
if not os.path.exists(os.path.join(self.map_out_path, "detection-results")):
os.makedirs(os.path.join(self.map_out_path, "detection-results"))
print("Get map.")
for annotation_line in tqdm(self.val_lines):
line = annotation_line.split()
image_id = os.path.basename(line[0]).split('.')[0]
#------------------------------#
# 读取图像并转换成RGB图像
#------------------------------#
image = Image.open(line[0])
#------------------------------#
# 获得预测框
#------------------------------#
gt_boxes = np.array([np.array(list(map(int,box.split(',')))) for box in line[1:]])
#------------------------------#
# 获得预测txt
#------------------------------#
self.get_map_txt(image_id, image, self.class_names, self.map_out_path)
#------------------------------#
# 获得真实框txt
#------------------------------#
with open(os.path.join(self.map_out_path, "ground-truth/"+image_id+".txt"), "w") as new_f:
for box in gt_boxes:
left, top, right, bottom, obj = box
obj_name = self.class_names[obj]
new_f.write("%s %s %s %s %s\n" % (obj_name, left, top, right, bottom))
print("Calculate Map.")
try:
temp_map = get_coco_map(class_names = self.class_names, path = self.map_out_path)[1]
except:
temp_map = get_map(self.MINOVERLAP, False, path = self.map_out_path)
self.maps.append(temp_map)
self.epoches.append(epoch)
with open(os.path.join(self.log_dir, "epoch_map.txt"), 'a') as f:
f.write(str(temp_map))
f.write("\n")
plt.figure()
plt.plot(self.epoches, self.maps, 'red', linewidth = 2, label='train map')
plt.grid(True)
plt.xlabel('Epoch')
plt.ylabel('Map %s'%str(self.MINOVERLAP))
plt.title('A Map Curve')
plt.legend(loc="upper right")
plt.savefig(os.path.join(self.log_dir, "epoch_map.png"))
plt.cla()
plt.close("all")
print("Get map done.")
shutil.rmtree(self.map_out_path)
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