more_tf_stuff.py

from PIL import Image
import numpy as np
import hashlib
import os
import sys
import torch
import torch_xla.utils.tf_record_reader as tfrr

a = """
image/class/label       tensor([82])
image/class/synset      n01796340
image/channels  tensor([3])
image/object/bbox/label tensor([], dtype=torch.int64)
image/width     tensor([900])
image/format    JPEG
image/height    tensor([600])
image/class/text        ptarmigan
image/object/bbox/ymin  tensor([])
image/encoded   tensor([ -1, -40,  -1,  ..., -30,  -1, -39], dtype=torch.int8)
image/object/bbox/ymax  tensor([])
image/object/bbox/xmin  tensor([])
image/filename  n01796340_812.JPEG
image/object/bbox/xmax  tensor([])
image/colorspace        RGB
"""


def decode(ex):
  w = ex['image/width'].item()
  h = ex['image/height'].item()
  imgb = ex['image/encoded'].numpy().tobytes()

  m = hashlib.md5()
  m.update(imgb)
  print('HASH = {}'.format(m.hexdigest()))

  image = Image.frombytes(ex['image/colorspace'], (w, h), imgb,
                          ex['image/format'].lower(), 'RGB', None)
  npa = np.asarray(image)
  return torch.from_numpy(npa), image


def readem(path, img_path=None):
  transforms = {
      'image/filename': 'STR',
      'image/class/synset': 'STR',
      'image/format': 'STR',
      'image/class/text': 'STR',
      'image/colorspace': 'STR',
  }
  r = tfrr.TfRecordReader(path, compression='', transforms=transforms)
  count = 0
  while True:
    ex = r.read_example()
    if not ex:
      break
    print('\n')
    for lbl, data in ex.items():
      print('{}\t{}'.format(lbl, data))
    img_tensor, image = decode(ex)
    if img_path:
      image.save(os.path.join(img_path, str(count) + '.jpg'))
    count += 1
  print('\n\nDecoded {} samples'.format(count))


readem(sys.argv[1], img_path='/tmp/tf_images')