Add segmentations url and update CaltechBirdsInfo2011 class

Author: SanjaySG

tensorflow_datasets/image_classification/caltech_birds.py

@@ -233,7 +233,8 @@ class CaltechBirds2011(CaltechBirds2010):
   def _caltech_birds_info(self):
     return CaltechBirdsInfo2011(
         name=self.name,
-        combined_url="https://data.caltech.edu/records/65de6-vp158/files/CUB_200_2011.tgz?download=1"
+        images_url="https://data.caltech.edu/records/65de6-vp158/files/CUB_200_2011.tgz?download=1",
+        segmentations_url="https://data.caltech.edu/records/w9d68-gec53/files/segmentations.tgz?download=1"
         # images_url="https://drive.google.com/uc?export=download&id=1hbzc_P1FuxMkcabkgn9ZKinBwW683j45",
         # split_url=None,
         # annotations_url="https://drive.google.com/uc?export=download&id=1EamOKGLoTuZdtcVYbHMWNpkn3iAVj8TP",
@@ -374,12 +375,13 @@ class CaltechBirdsInfo(
 class CaltechBirdsInfo2011(
     collections.namedtuple(
         "_CaltechBirdsInfo2011",
-        ["name", "combined_url"],
+        ["name", "images_urls", "segmentations_url"],
     )
 ):
   """Contains the information necessary to generate a Caltech Birds 2011 dataset.
 
   Args:
       name (str): name of dataset.
-      combined_url (str): URL containing images and attributes.
+      images_urls (str): URL containing images
+      segmentations_url (str): URL containing segmentations.
   """