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使用h5py怎么对数据进行封装?很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
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h6py文件是存放两类对象的容器,数据集(dataset)和组(group),dataset类似数组类的数据集合,和numpy的数组差不多。group是像文件夹一样的容器,它好比python中的字典,有键(key)和值(value)。group中可以存放dataset或者其他的group。”键”就是组成员的名称,”值”就是组成员对象本身(组或者数据集),下面来看下如何创建组和数据集。
1.1 创建一个h6py文件
import h6py #要是读取文件的话,就把w换成r f=h6py.File("myh6py.hdf5","w")
在当前目录下会生成一个myh6py.hdf5文件。
2. 创建dataset数据集
import h6py f=h6py.File("myh6py.hdf5","w") #deset1是数据集的name,(20,)代表数据集的shape,i代表的是数据集的元素类型 d1=f.create_dataset("dset1", (20,), 'i') for key in f.keys(): print(key) print(f[key].name) print(f[key].shape) print(f[key].value)
输出:
dset1 /dset1 (20,) [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] import h6py import numpy as np f=h6py.File("myh6py.hdf5","w") a=np.arange(20) d1=f.create_dataset("dset1",data=a) for key in f.keys(): print(f[key].name) print(f[key].value)
输出:
/dset1 [ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19] 2. hpf5用于封装训练集和测试集 #============================================================ # This prepare the hdf5 datasets of the DRIVE database #============================================================ import os import h6py import numpy as np from PIL import Image def write_hdf5(arr,outfile): with h6py.File(outfile,"w") as f: f.create_dataset("image", data=arr, dtype=arr.dtype) #------------Path of the images -------------------------------------------------------------- #train original_imgs_train = "./DRIVE/training/images/" groundTruth_imgs_train = "./DRIVE/training/1st_manual/" borderMasks_imgs_train = "./DRIVE/training/mask/" #test original_imgs_test = "./DRIVE/test/images/" groundTruth_imgs_test = "./DRIVE/test/1st_manual/" borderMasks_imgs_test = "./DRIVE/test/mask/" #--------------------------------------------------------------------------------------------- Nimgs = 20 channels = 3 height = 584 width = 565 dataset_path = "./DRIVE_datasets_training_testing/" def get_datasets(imgs_dir,groundTruth_dir,borderMasks_dir,train_test="null"): imgs = np.empty((Nimgs,height,width,channels)) groundTruth = np.empty((Nimgs,height,width)) border_masks = np.empty((Nimgs,height,width)) for path, subdirs, files in os.walk(imgs_dir): #list all files, directories in the path for i in range(len(files)): #original print "original image: " +files[i] img = Image.open(imgs_dir+files[i]) imgs[i] = np.asarray(img) #corresponding ground truth groundTruth_name = files[i][0:2] + "_manual1.gif" print "ground truth name: " + groundTruth_name g_truth = Image.open(groundTruth_dir + groundTruth_name) groundTruth[i] = np.asarray(g_truth) #corresponding border masks border_masks_name = "" if train_test=="train": border_masks_name = files[i][0:2] + "_training_mask.gif" elif train_test=="test": border_masks_name = files[i][0:2] + "_test_mask.gif" else: print "specify if train or test!!" exit() print "border masks name: " + border_masks_name b_mask = Image.open(borderMasks_dir + border_masks_name) border_masks[i] = np.asarray(b_mask) print "imgs max: " +str(np.max(imgs)) print "imgs min: " +str(np.min(imgs)) assert(np.max(groundTruth)==255 and np.max(border_masks)==255) assert(np.min(groundTruth)==0 and np.min(border_masks)==0) print "ground truth and border masks are correctly withih pixel value range 0-255 (black-white)" #reshaping for my standard tensors imgs = np.transpose(imgs,(0,3,1,2)) assert(imgs.shape == (Nimgs,channels,height,width)) groundTruth = np.reshape(groundTruth,(Nimgs,1,height,width)) border_masks = np.reshape(border_masks,(Nimgs,1,height,width)) assert(groundTruth.shape == (Nimgs,1,height,width)) assert(border_masks.shape == (Nimgs,1,height,width)) return imgs, groundTruth, border_masks if not os.path.exists(dataset_path): os.makedirs(dataset_path) #getting the training datasets imgs_train, groundTruth_train, border_masks_train = get_datasets(original_imgs_train,groundTruth_imgs_train,borderMasks_imgs_train,"train") print "saving train datasets" write_hdf5(imgs_train, dataset_path + "DRIVE_dataset_imgs_train.hdf5") write_hdf5(groundTruth_train, dataset_path + "DRIVE_dataset_groundTruth_train.hdf5") write_hdf5(border_masks_train,dataset_path + "DRIVE_dataset_borderMasks_train.hdf5") #getting the testing datasets imgs_test, groundTruth_test, border_masks_test = get_datasets(original_imgs_test,groundTruth_imgs_test,borderMasks_imgs_test,"test") print "saving test datasets" write_hdf5(imgs_test,dataset_path + "DRIVE_dataset_imgs_test.hdf5") write_hdf5(groundTruth_test, dataset_path + "DRIVE_dataset_groundTruth_test.hdf5") write_hdf5(border_masks_test,dataset_path + "DRIVE_dataset_borderMasks_test.hdf5")
遍历文件夹下的所有文件 os.walk( dir )
for parent, dir_names, file_names in os.walk(parent_dir): for i in file_names: print file_name
parent: 父路径
dir_names: 子文件夹
file_names: 文件名
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