[test] scale up accuracy test shapes

tests/accuracy_utils.py

@@ -14,7 +14,7 @@
 }
 
 POINTWISE_SHAPES = [(1024, 1024), (16, 1024, 256), (16, 128, 64, 64), (20, 320, 15)]
-REDUCTION_SHAPES = [(1024, 64 * i) for i in range(1, 10, 2)]
+REDUCTION_SHAPES = [(4096, 256 * i) for i in range(1, 10, 2)]
 MNK_SHAPES = [15, 160, 1024]
 
 FLOAT_DTYPES = [torch.float16, torch.float32, torch.bfloat16]