[Eager] fix collective_global_gather (#43090)

* [Eager] fix collective_global_gather

* fix eager_ode = 1

python/paddle/fluid/tests/unittests/collective_global_gather.py

@@ -23,6 +23,7 @@ import unittest
 import paddle.fluid.layers as layers
 from test_collective_api_base import TestCollectiveAPIRunnerBase, runtime_main
 import pickle
+from paddle.fluid.framework import _enable_legacy_dygraph
 
 paddle.enable_static()
 
@@ -74,6 +75,9 @@ class TestCollectiveGlobalGatherAPI(TestCollectiveAPIRunnerBase):
         world_size = 2
         tot_expert = n_expert * world_size
         paddle.disable_static()
+
+        # Call paddle.distributed.alltoall() under legacy dygraph
+        _enable_legacy_dygraph()
         np.random.seed(os.getpid())
         local_expert_count = np.random.randint(
             1, 4, size=tot_expert).astype("int64")

python/paddle/fluid/tests/unittests/test_collective_api_base.py

@@ -219,9 +219,9 @@ class TestDistBase(unittest.TestCase):
             required_envs["GLOO_LOG_LEVEL"] = "TRACE"
 
         if eager_mode:
-            required_envs["FLAGS_enable_eager_mode"] = "%d" % 0
-        else:
             required_envs["FLAGS_enable_eager_mode"] = "%d" % 1
+        else:
+            required_envs["FLAGS_enable_eager_mode"] = "%d" % 0
 
         tr0_out, tr1_out, pid0, pid1 = self._run_cluster(model_file,
                                                          required_envs)