fix random shuffle

tests/nightly/test_large_array.py

@@ -165,7 +165,7 @@ def test_ndarray_random_randn():
 @with_seed()
 def test_ndarray_random_shuffle():
     a = nd.ones(shape=(LARGE_X, SMALL_Y))
-    a[-1] == 3  # assign 3 to entire last row
+    a[-1] = 3  # assign 3 to entire last row
     a = nd.random.shuffle(a)
     # slice first column from shuffled array
     # pass LARGE_X values to numpy instead of LARGE_X*SMALL_Y