fix(mge/random): fix random seed

GitOrigin-RevId: 121f459b1b30a086776e9832e15849de9987da0e

imperative/python/test/unit/random/test_rng.py

@@ -27,7 +27,7 @@ from megengine.core.ops.builtin import (
     UniformRNG,
 )
 from megengine.distributed.helper import get_device_count_by_fork
-from megengine.random import RNG
+from megengine.random import RNG, seed, uniform
 
 
 @pytest.mark.skipif(
@@ -387,3 +387,18 @@ def test_PermutationRNG():
 
     assert sum_result(out, lambda x: x) < 500
     assert sum_result(out, np.sort) == 1000
+
+
+def test_seed():
+    seed(10)
+    out1 = uniform(size=[10, 10])
+    out2 = uniform(size=[10, 10])
+    assert not (out1.numpy() == out2.numpy()).all()
+
+    seed(10)
+    out3 = uniform(size=[10, 10])
+    np.testing.assert_equal(out1.numpy(), out3.numpy())
+
+    seed(11)
+    out4 = uniform(size=[10, 10])
+    assert not (out1.numpy() == out4.numpy()).all()

imperative/src/impl/ops/rng.cpp

@@ -127,10 +127,8 @@ public:
         auto&& glob_handle = glob_default_handles[comp_node];
         if (!glob_handle) {
             glob_handle = inst().do_new_handle(comp_node, glob_default_seed);
-        } else if (get_seed(glob_handle) != glob_default_seed) {
-            inst().DnnOpManagerBase::delete_handle(glob_handle);
-            glob_handle = inst().do_new_handle(comp_node, glob_default_seed);
         }
+        mgb_assert(get_seed(glob_handle) == glob_default_seed);
         return glob_handle;
     }
 
@@ -141,6 +139,13 @@ public:
 
     static void set_glob_default_seed(uint64_t seed) {
         MGB_LOCK_GUARD(sm_mtx);
+        for(auto && elem : glob_default_handles){
+            mgb_assert(elem.first.valid());
+            if(elem.second){
+                inst().DnnOpManagerBase::delete_handle(elem.second);
+            }
+            elem.second = inst().do_new_handle(elem.first, seed);
+        }
         glob_default_seed = seed;
     }