Revert "Load and parse metadata for CIFAR-10, CIFAR-100 (#502)" (#506)

This reverts commit 972b80c9.

torchvision/datasets/cifar.py

@@ -46,10 +46,6 @@ class CIFAR10(data.Dataset):
         ['test_batch', '40351d587109b95175f43aff81a1287e'],
     ]
 
-    meta_list = [
-        ['batches.meta', '5ff9c542aee3614f3951f8cda6e48888'],
-    ]
-
     def __init__(self, root, train=True,
                  transform=None, target_transform=None,
                  download=False):
@@ -104,16 +100,6 @@ class CIFAR10(data.Dataset):
             self.test_data = self.test_data.reshape((10000, 3, 32, 32))
             self.test_data = self.test_data.transpose((0, 2, 3, 1))  # convert to HWC
 
-        f = self.meta_list[0][0]
-        file = os.path.join(self.root, self.base_folder, f)
-        fo = open(file, 'rb')
-        if sys.version_info[0] == 2:
-            entry = pickle.load(fo)
-        else:
-            entry = pickle.load(fo, encoding='latin1')
-        fo.close()
-        self.meta = entry
-
     def __getitem__(self, index):
         """
         Args:
@@ -147,7 +133,7 @@ class CIFAR10(data.Dataset):
 
     def _check_integrity(self):
         root = self.root
-        for fentry in (self.train_list + self.test_list + self.meta_list):
+        for fentry in (self.train_list + self.test_list):
             filename, md5 = fentry[0], fentry[1]
             fpath = os.path.join(root, self.base_folder, filename)
             if not check_integrity(fpath, md5):
@@ -201,7 +187,3 @@ class CIFAR100(CIFAR10):
     test_list = [
         ['test', 'f0ef6b0ae62326f3e7ffdfab6717acfc'],
     ]
-
-    meta_list = [
-        ['meta', '7973b15100ade9c7d40fb424638fde48'],
-    ]