RetinaNet dataloader (#9442)

* retinanet dataloader

* remove batch_size from generate_anchors

* refactor kits19 dataset tests

* add tests for dataloader

* fix testing setup and cleanups

* remove unused import

setup.py

@@ -68,7 +68,10 @@ setup(name='tinygrad',
             "nibabel",
             "bottle",
             "ggml-python",
-            "capstone"
+            "capstone",
+            "pycocotools",
+            "boto3",
+            "pandas"
         ],
         'docs': [
             "mkdocs",