[API] implement device mesh manager (#3221)

* [API] implement  device mesh manager

* polish

tests/test_cluster/test_device_mesh_manager.py

@@ -0,0 +1,40 @@
+from functools import partial
+
+import torch
+import torch.multiprocessing as mp
+
+from colossalai.cluster.device_mesh_manager import DeviceMeshInfo, DeviceMeshManager
+from colossalai.device.device_mesh import DeviceMesh
+from colossalai.fx.tracer import ColoTracer
+from colossalai.initialize import launch
+from colossalai.logging import disable_existing_loggers
+from colossalai.utils import free_port
+
+
+def check_device_mesh_manager(rank, world_size, port):
+    disable_existing_loggers()
+    launch(config={}, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
+    device_mesh_manager = DeviceMeshManager()
+    device_mesh_info_auto = DeviceMeshInfo(physical_ids=[0, 1, 2, 3],)
+    device_mesh_auto = device_mesh_manager.create_device_mesh('0', device_mesh_info_auto)
+    assert device_mesh_auto.shape == (2, 2)
+    assert device_mesh_auto._logical_mesh_id.tolist() == [[0, 1], [2, 3]]
+
+    device_mesh_info_with_shape = DeviceMeshInfo(
+        physical_ids=[0, 1, 2, 3],
+        mesh_shape=(2, 2),
+    )
+    device_mesh_with_shape = device_mesh_manager.create_device_mesh('1', device_mesh_info_with_shape)
+
+    assert device_mesh_with_shape.shape == (2, 2)
+    assert device_mesh_with_shape._logical_mesh_id.tolist() == [[0, 1], [2, 3]]
+
+
+def test_device_mesh_manager():
+    world_size = 4
+    run_func = partial(check_device_mesh_manager, world_size=world_size, port=free_port())
+    mp.spawn(run_func, nprocs=world_size)
+
+
+if __name__ == '__main__':
+    test_device_mesh_manager()