[Doc|Train] Add Pytorch ResNet finetuning starter example

doc/BUILD

@@ -225,3 +225,13 @@ py_test_run_all_subdirectory(
     extra_srcs = [],
     tags = ["exclusive", "team:ml", "ray_air", "gpu"],
 )
+
+py_test(
+    name = "pytorch_resnet_finetune",
+    size = "large",
+    main = "test_myst_doc.py",
+    srcs = ["test_myst_doc.py"],
+    tags = ["exclusive", "team:ml", "gpu", "ray_air"],
+    data = ["//doc/source/train/examples/pytorch:train_pytorch_examples"],
+    args = ["--path", "doc/source/train/examples/pytorch/pytorch_resnet_finetune.ipynb"]
+)

doc/source/_toc.yml

@@ -140,6 +140,8 @@ parts:
                 title: "Tune & PyTorch Example"
               - file: train/examples/pytorch/torch_data_prefetch_benchmark/benchmark_example
                 title: "Torch Data Prefetching Benchmark"
+              - file: train/examples/pytorch/pytorch_resnet_finetune
+                title: "PyTorch Finetuning ResNet Example"
           - file: train/faq
           - file: train/api/api
 

doc/source/train/examples/pytorch/BUILD

@@ -0,0 +1,5 @@
+filegroup(
+    name = "train_pytorch_examples",
+    srcs = glob(["*.ipynb"]),
+    visibility = ["//doc:__subpackages__"]
+)