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dataset.py
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dataset.py
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from __future__ import print_function
import os
import time
import random
import numpy as np
import ctypes
from multiprocessing import Process,Queue,Array
def numpy_to_share(index,image,label,nparrimage,nparrlabel):
nparrimage[index,0:image.size] = image.reshape(-1)[0:image.size]
nparrlabel[index,0:label.size] = label.reshape(-1)[0:label.size]
def return_batchdata(result,imagelist,labellist,pathlist,freearr,nparrimage,nparrlabel):
index = freearr.get() # wait for free index
image = np.vstack(imagelist)
label = np.vstack(labellist)
numpy_to_share(index,image,label,nparrimage,nparrlabel)
result.put((index,image.shape,label.shape,list(pathlist)))
del imagelist[:]
del labellist[:]
del pathlist[:]
def dataset_handle(name,filelist,result,callback,bs,pindex,freearr,arrimage,arrlabel,zfile):
cacheobj = type('', (), {})
imagelist = []
labellist = []
pathlist = []
nparrimage = np.frombuffer(arrimage.get_obj(),np.float32).reshape(10,len(arrimage)/10)
nparrlabel = np.frombuffer(arrlabel.get_obj(),np.float32).reshape(10,len(arrlabel)/10)
while True:
filename = filelist.get()
if filename.endswith('\n'): filename=filename[:-1]
if filename=='FINISH': break
data = callback(name,filename,pindex,cacheobj,zfile)
if data is not None:
imagelist.append(data[0])
labellist.append(data[1])
pathlist.append(filename)
if len(imagelist)==bs: return_batchdata(result,imagelist,labellist,pathlist,freearr,nparrimage,nparrlabel)
if len(imagelist)>0: return_batchdata(result,imagelist,labellist,pathlist,freearr,nparrimage,nparrlabel)
result.put(('FINISH','FINISH','FINISH','FINISH'))
class ImageDataset(object):
zipcache = {}
def __init__(self,imageroot,callback,imagelistfile=None,bs=1,shuffle=False,
nthread=4,name='',imagesize=128,pathinfo=False,maxlistnum=None):
self.callback = callback #callback(name,filename,pindex,cacheobj) result=(image,label) in np.array
self.bs = bs
self.shuffle = shuffle
self.nthread = nthread
self.name = name
self.arrimage = Array(ctypes.c_float, 10*bs*3*imagesize*imagesize)
self.arrlabel = Array(ctypes.c_float, 10*bs*3*imagesize*imagesize)
self.nparrimage = np.frombuffer(self.arrimage.get_obj(),np.float32).reshape(10,len(self.arrimage)/10)
self.nparrlabel = np.frombuffer(self.arrlabel.get_obj(),np.float32).reshape(10,len(self.arrlabel)/10)
self.filelist = Queue()
self.result = Queue()
self.freearr = Queue()
self.imagenum = 0
self.finishnum = 0
self.zfile = None
self.pathinfo = pathinfo
for i in range(10): self.freearr.put(i)
self.flist = []
if imagelistfile is None and os.path.isdir(imageroot):
for (dirpath, dirnames, filenames) in os.walk(imageroot):
for filename in filenames: self.flist.append(dirpath+'/'+filename)
else:
if os.path.isdir(imageroot): imageroot = imageroot + '/'
else:
imageroot = imageroot + ':'
if '.zip:' in imageroot:
import zipfile
zipfilepath = imageroot.split(':')[0]
if zipfilepath in ImageDataset.zipcache: self.zfile = ImageDataset.zipcache[zipfilepath]
else:
self.zfile = zipfile.ZipFile(zipfilepath)
ImageDataset.zipcache[zipfilepath] = self.zfile
if '.zip:' in imageroot and imagelistfile is None:
for zf in self.zfile.filelist: self.flist.append(imageroot+zf.filename)
elif '.zip:' in imagelistfile:
with self.zfile.open(imagelistfile.split(':')[1]) as f: lines = f.readlines()
for line in lines: self.flist.append(imageroot+line) # zippath:filename classname
else:
with open(imagelistfile) as f: lines = f.readlines()
for line in lines: self.flist.append(imageroot+line) # root/filepath classname || zippath:filename classname
self.imagenum = len(self.flist)
if self.shuffle: random.shuffle(self.flist)
for filepath in self.flist:
self.filelist.put(filepath)
if maxlistnum is not None: maxlistnum -= 1
if maxlistnum==0: break
for i in range(nthread):
self.filelist.put('FINISH')
p = Process(target=dataset_handle, args=(self.name,self.filelist,self.result,self.callback,self.bs,i,
self.freearr,self.arrimage,self.arrlabel,self.zfile))
p.start()
def get(self):
while True:
index,imageshape,labelshape,pathlist = self.result.get()
if type(index)==str and index=='FINISH':
self.finishnum += 1
if self.finishnum==self.nthread:
if self.pathinfo: return (None,None,None)
else: return (None,None)
else: continue
imagesize = np.prod(imageshape)
labelsize = np.prod(labelshape)
image = np.empty(imageshape,np.float32)
label = np.empty(labelshape,np.float32)
image.reshape(imagesize)[:] = self.nparrimage[index,0:imagesize]
label.reshape(labelsize)[:] = self.nparrlabel[index,0:labelsize]
self.freearr.put(index)
if self.pathinfo: return (image,label,pathlist)
else: return (image,label)