fix some test files test time is too long (#16067)

tests/python/unittest/test_operator.py

@@ -3704,7 +3704,7 @@ def l2norm(input_data, axis=0, keepdims=True):
 
     ctx = default_context()
     data = mx.symbol.Variable('data')
-    in_data_dim = random_sample([4,5,6], 1)[0]
+    in_data_dim = random_sample([2,3,4], 1)[0]
     in_shape = rand_shape_nd(in_data_dim, dim=5)
     epsilon = 1e-3
     acc_type = {np.float16: np.float32, np.float32: np.float32, np.float64: np.float64,
@@ -6807,7 +6807,7 @@ def test_laop_5():
     # tests for diagonal and triangular matrix extraction and generation
     data = mx.symbol.Variable('data')
     # test complete range of small matrices to cover corner cases
-    for n in range(1, 10):
+    for n in range(1, 5):
         # test batched and non-batched processing
         for b in range(3):
             shape = (n, n) if b == 0 else (b, n, n)

tests/python/unittest/test_sparse_operator.py

@@ -494,10 +494,10 @@ def check_elemwise_binary_ops(lhs_stype, rhs_stype, shape,
 
         for ii in range(1):
             # Run defaults
-            check_elemwise_binary_ops('default', 'default', rand_shape_2d())
+            check_elemwise_binary_ops('default', 'default', rand_shape_2d(5, 5))
 
             # Try different densities
-            shape = rand_shape_2d()
+            shape = rand_shape_2d(5, 5)
             for lhs_density in [0.0, random.uniform(0, 1), 1.0]:
                 for rhs_density in [0.0, random.uniform(0, 1), 1.0]:
                     for ograd_density in [0.0, random.uniform(0, 1), 1.0]: