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[英]How to save and use a Tensorflow dataset using the Experimental save and load mehods?
[英]How to load and save Widerface dataset for ssd network in tensorflow?
我想在tensorflow中為ssd(單發多盒檢測器)網絡加載和保存Widerface標簽,但是wider_face_train_bbx_gt
是如此復雜。
如何在tensorflow中為ssd網絡保存標簽?
為了加載數據集,我給你一個解釋,說明如何使用TensorPack在TensorFlow中做到這一點 (僅用於數據)。
首先,我們需要包含邊界框的zip文件和mat文件。 以下部分基本上直接從zip文件和mat文件中讀取
class RawWiderFaceReader(RNGDataFlow):
"""Read images directly from tar file without unpacking
boxes: left, top, width, height
"""
def __init__(self, matfile, zipfile):
super(RawWiderFaceReader, self).__init__()
self.matfile = matfile
self.zipfile = zipfile
self.subset = matfile.split('_')[-1].replace('.mat', '')
f = sio.loadmat(matfile)
events = [f['event_list'][i][0][0] for i in range(len(f['event_list']))]
raw_files = [f['file_list'][i][0] for i in range(len(f['file_list']))]
raw_bbx = [f['face_bbx_list'][i][0] for i in range(len(f['face_bbx_list']))]
col_files = []
for file, bbx in zip(raw_files, raw_bbx):
for filee, bbxe in zip(file, bbx):
col_files.append((filee[0][0], bbxe[0]))
self.col_files2 = []
for file, bbx in col_files:
for ev in events:
if file.startswith(ev.replace('--', '_')):
self.col_files2.append((str('WIDER_%s/images/' % self.subset + ev +
'/' + file + '.jpg').encode('ascii', 'ignore'), bbx))
break
def get_data(self):
with ZipFile(self.zipfile, 'r') as zip_hnd:
for fn, bbx in self.col_files2:
buf = zip_hnd.read('%s' % fn)
yield [buf, bbx]
它為您提供了一個生成器get_data()
,該生成器返回jpeg編碼的圖像和邊界框。 它的存儲方式似乎很復雜,因為它是一個包含Matlab生成的邊界框的文件。 要繪制邊界框,可以使用:
def draw_rect(img, top, left, bottom, right, rgb, margin=1):
m = margin
r, g, b = rgb
img[top:bottom, left - m:left + m, 0] = r
img[top:bottom, left - m:left + m, 1] = g
img[top:bottom, left - m:left + m, 2] = b
img[top:bottom, right - m:right + m, 0] = r
img[top:bottom, right - m:right + m, 1] = g
img[top:bottom, right - m:right + m, 2] = b
img[top - m:top + m, left:right, 0] = r
img[top - m:top + m, left:right, 1] = g
img[top - m:top + m, left:right, 2] = b
img[bottom - m:bottom + m, left:right, 0] = r
img[bottom - m:bottom + m, left:right, 1] = g
img[bottom - m:bottom + m, left:right, 2] = b
return img
整個腳本在這里: https : //gist.github.com/PatWie/a743d2349f388b27ed3ef783919c3882
在pip install -U git+https://github.com/ppwwyyxx/tensorpack.git
之后,您可以通過以下方式啟動它
python data_sampler.py --zip /scratch/patwie/data/wider_face/WIDER_val.zip \
--mat wider_face_split/wider_face_val.mat \
--debug
要將其轉換為lmdb文件,可以使用其他參數。 無需在此處解壓縮數據。
要使用數據,就像在腳本中一樣:
from tensorpack import *
ds = LMDBDataPoint('/scratch/wieschol/data/wider_face/WIDER_train.lmdb', shuffle=True)
ds = RawWiderFaceReader(matfile=args.mat, zipfile=args.zip)
ds.reset_state()
for jpeg, bbx in ds.get_data():
rgb = cv2.imdecode(np.asarray(jpeg), cv2.IMREAD_COLOR)
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