Fix test_bench script (#2320)

Summary:
Fixes #2315

Pull Request resolved: #2320

Test Plan:
```
$ pytest test_bench.py -k "test_eval[BERT_pytorch-cpu]" --ignore_machine_config
========================================================================================== test session starts ===========================================================================================
platform linux -- Python 3.11.5, pytest-7.4.3, pluggy-1.0.0
benchmark: 4.0.0 (defaults: timer=time.perf_counter disable_gc=False min_rounds=5 min_time=0.000005 max_time=1.0 calibration_precision=10 warmup=False warmup_iterations=100000)
rootdir: /home/xz/git/benchmark
plugins: benchmark-4.0.0, hypothesis-6.98.15
collected 411 items / 410 deselected / 1 selected

test_bench.py .                                                                                                                                                                                    [100%]

------------------------------------------------- benchmark 'hub': 1 tests -------------------------------------------------
Name (time in ms)                    Min       Max      Mean  StdDev    Median     IQR  Outliers     OPS  Rounds  Iterations
----------------------------------------------------------------------------------------------------------------------------
test_eval[BERT_pytorch-cpu]     114.2104  117.3853  115.4276  1.0485  115.3054  1.4325       4;0  8.6634       9           1
----------------------------------------------------------------------------------------------------------------------------

Legend:
  Outliers: 1 Standard Deviation from Mean; 1.5 IQR (InterQuartile Range) from 1st Quartile and 3rd Quartile.
  OPS: Operations Per Second, computed as 1 / Mean
=================================================================================== 1 passed, 410 deselected in 5.68s ====================================================================================
```

Reviewed By: aaronenyeshi

Differential Revision: D58823072

Pulled By: xuzhao9

fbshipit-source-id: 172be1d922b2a51ec2df08b822102dc0a20818ac

Author: xuzhao9

test_bench.py

@@ -42,11 +42,10 @@ def pytest_generate_tests(metafunc):
 
     if metafunc.cls and metafunc.cls.__name__ == "TestBenchNetwork":
         paths = _list_model_paths()
-        model_names = [os.path.basename(path) for path in paths]
         metafunc.parametrize(
-            "model_name",
-            model_names,
-            ids=model_names,
+            "model_path",
+            paths,
+            ids=[os.path.basename(path) for path in paths],
             scope="class",
         )
 
@@ -62,13 +61,14 @@ def pytest_generate_tests(metafunc):
 )
 class TestBenchNetwork:
 
-    def test_train(self, model_name, device, compiler, benchmark):
+    def test_train(self, model_path, device, benchmark):
         try:
+            model_name = os.path.basename(model_path)
             if skip_by_metadata(
                 test="train",
                 device=device,
                 extra_args=[],
-                metadata=get_metadata_from_yaml(model_name),
+                metadata=get_metadata_from_yaml(model_path),
             ):
                 raise NotImplementedError("Test skipped by its metadata.")
             # TODO: skipping quantized tests for now due to BC-breaking changes for prepare
@@ -91,13 +91,14 @@ def test_train(self, model_name, device, compiler, benchmark):
         except NotImplementedError:
             print(f"Test train on {device} is not implemented, skipping...")
 
-    def test_eval(self, model_name, device, compiler, benchmark, pytestconfig):
+    def test_eval(self, model_path, device, benchmark, pytestconfig):
         try:
+            model_name = os.path.basename(model_path)
             if skip_by_metadata(
                 test="eval",
                 device=device,
                 extra_args=[],
-                metadata=get_metadata_from_yaml(model_name),
+                metadata=get_metadata_from_yaml(model_path),
             ):
                 raise NotImplementedError("Test skipped by its metadata.")
             # TODO: skipping quantized tests for now due to BC-breaking changes for prepare
@@ -110,16 +111,15 @@ def test_eval(self, model_name, device, compiler, benchmark, pytestconfig):
 
             task.make_model_instance(test="eval", device=device)
 
-            with task.no_grad(disable_nograd=pytestconfig.getoption("disable_nograd")):
-                benchmark(task.invoke)
-                benchmark.extra_info["machine_state"] = get_machine_state()
-                benchmark.extra_info["batch_size"] = task.get_model_attribute(
-                    "batch_size"
-                )
-                benchmark.extra_info["precision"] = task.get_model_attribute(
-                    "dargs", "precision"
-                )
-                benchmark.extra_info["test"] = "eval"
+            benchmark(task.invoke)
+            benchmark.extra_info["machine_state"] = get_machine_state()
+            benchmark.extra_info["batch_size"] = task.get_model_attribute(
+                 "batch_size"
+            )
+            benchmark.extra_info["precision"] = task.get_model_attribute(
+                 "dargs", "precision"
+            )
+            benchmark.extra_info["test"] = "eval"
 
         except NotImplementedError:
             print(f"Test eval on {device} is not implemented, skipping...")