diff --git a/models/yolo.py b/models/yolo.py
index c69cfdb..7e36dab 100644
--- a/models/yolo.py
+++ b/models/yolo.py
@@ -20,7 +20,6 @@ class Detect(nn.Module):
         self.export = False  # onnx export
 
     def forward(self, x):
-        x = x.copy()
         z = []  # inference output
         self.training |= self.export
         for i in range(self.nl):
diff --git a/test.py b/test.py
index c72998f..ce1ad08 100644
--- a/test.py
+++ b/test.py
@@ -244,7 +244,7 @@ if __name__ == '__main__':
     print(opt)
 
     # task = 'val', 'test', 'study'
-    if opt.task == 'val':  # (default) run normally
+    if opt.task in ['val', 'test']:  # (default) run normally
         test(opt.data,
              opt.weights,
              opt.batch_size,
@@ -258,7 +258,7 @@ if __name__ == '__main__':
     elif opt.task == 'study':  # run over a range of settings and save/plot
         for weights in ['yolov5s.pt', 'yolov5m.pt', 'yolov5l.pt', 'yolov5x.pt', 'yolov3-spp.pt']:
             f = 'study_%s_%s.txt' % (Path(opt.data).stem, Path(weights).stem)  # filename to save to
-            x = list(range(256, 1024, 32))  # x axis
+            x = list(range(256, 1024, 64))  # x axis
             y = []  # y axis
             for i in x:  # img-size
                 print('\nRunning %s point %s...' % (f, i))
diff --git a/utils/datasets.py b/utils/datasets.py
index 78b6690..5cdd95e 100755
--- a/utils/datasets.py
+++ b/utils/datasets.py
@@ -322,7 +322,7 @@ class LoadImagesAndLabels(Dataset):  # for training/testing
                 elif mini > 1:
                     shapes[i] = [1, 1 / mini]
 
-            self.batch_shapes = np.ceil(np.array(shapes) * img_size / 64.).astype(np.int) * 64
+            self.batch_shapes = np.round(np.array(shapes) * img_size / 32. + 1.).astype(np.int) * 32
 
         # Cache labels
         self.imgs = [None] * n