fix flaky

tests/python/unittest/test_operator.py

@@ -498,11 +498,11 @@ def test_relu():
     def frelu(x):
         return np.maximum(x, 0.0)
     def frelu_grad(x):
-        return 1.0 * (x > 0.0)
+        return np.float32(1.0) * (x > np.float32(0.0))
     shape = (3, 4)
     x = mx.symbol.Variable("x")
     y = mx.sym.relu(x)
-    xa = np.random.uniform(low=-1.0,high=1.0,size=shape)
+    xa = np.random.uniform(low=-1.0,high=1.0,size=shape).astype('float32')
     eps = 1e-4
     # Avoid finite difference method inaccuracies due to discontinuous gradient at the origin.
     # Here we replace small problematic inputs with 1.0.  Repro issue with seed 97264195.