refactor test

tests/python/unittest/test_operator.py

@@ -6118,15 +6118,6 @@ def test_laop():
     if grad_check == 1:
         check_grad(test_sumlogdiag, [a])
 
-    # test inverse
-    a = np.sqrt(np.arange(4 * 4)).reshape(4, 4)
-    a = rep_3x(a, 4, 4)
-    r = np.linalg.inv(a)
-    test_inverse = mx.sym.linalg.inverse(data1)
-    check_fw(test_inverse, [a], [r])
-    if grad_check == 1:
-        check_grad(test_inverse, [a])
-
 
 # Tests for operators linalg.syrk, linalg.gelqf
 
@@ -6424,6 +6415,34 @@ def test_laop_5():
                     check_symbolic_forward(test_trian, [data_in], [res_trian])
                     check_numeric_gradient(test_trian, [data_in])
 
+# Tests for linalg.inverse
+@with_seed()
+def test_laop_6():
+    dtype = np.float64
+    rtol_fw = 1e-7
+    atol_fw = 1e-9
+    num_eps = 1e-6
+    rtol_bw = 1e-5
+    atol_bw = 1e-6
+
+    data = mx.symbol.Variable('data')
+
+    check_fw = lambda sym, location, expected:\
+        check_symbolic_forward(sym, location, expected, rtol=rtol_fw,
+                               atol=atol_fw, dtype=dtype)
+    check_grad = lambda sym, location:\
+        check_numeric_gradient(sym, location, numeric_eps=num_eps, rtol=rtol_bw,
+                               atol=atol_bw, dtype=dtype)
+
+    a = np.sqrt(np.arange(4 * 4)).reshape(4, 4)
+    a = np.tile(a, (3, 1, 1))
+    r = np.eye(4)
+    r = np.tile(r, (3, 1, 1))
+    test_inverse = mx.sym.linalg.inverse(data)
+    test_eye = mx.sym.linalg.gemm2(data, test_inverse)
+    check_fw(test_eye, [a], [r])
+    check_grad(test_inverse, [a])
+
 @with_seed()
 def test_stack():
     for _ in range(100):