Fix yolov3 train accuracy test (#2321)

Summary:
Setup the correct example inputs for the yolov3 train accuracy test
Fixes #2248

Pull Request resolved: #2321

Reviewed By: aaronenyeshi

Differential Revision: D58823036

Pulled By: xuzhao9

fbshipit-source-id: d63c069bdf0da6ba496f274510e64d76e3c10f76

Author: xuzhao9

torchbenchmark/models/yolov3/__init__.py

@@ -54,7 +54,9 @@ def __init__(self, test, device, batch_size=None, extra_args=[]):
         self.num_epochs = 1
         self.train_num_batch = 1
         self.prefetch = True
-        if test == "train":
+        if test == "eval" or self.dargs.accuracy:
+            self.model, self.example_inputs = self.prep_eval()
+        elif test == "train":
             train_args = split(
                 f"--data {DATA_DIR}/coco128.data --img 416 --batch {self.batch_size} --nosave --notest \
                                 --epochs {self.num_epochs} --device {self.device_str} --weights '' \
@@ -64,8 +66,6 @@ def __init__(self, test, device, batch_size=None, extra_args=[]):
             self.training_loop, self.model, self.example_inputs = prepare_training_loop(
                 train_args
             )
-        elif test == "eval":
-            self.model, self.example_inputs = self.prep_eval()
         self.amp_context = nullcontext
 
     def prep_eval(self):