dataset.py 文件源码

def __getitem__(self, index):
        assert index <= len(self), 'index range error'
        index += 1
        with self.env.begin(write=False) as txn:
            img_key = 'image-%09d' % index
            imgbuf = txn.get(img_key)

            buf = six.BytesIO()
            buf.write(imgbuf)
            buf.seek(0)
            try:
                img = Image.open(buf).convert('L')
            except IOError:
                print('Corrupted image for %d' % index)
                return self[index + 1]

            if self.transform is not None:
                img = self.transform(img)

            label_key = 'label-%09d' % index
            label = str(txn.get(label_key))
            if self.target_transform is not None:
                label = self.target_transform(label)

        return (img, label)