[zero] add unit test for AgChunk's append, close, access (#1423)

tests/test_gemini/chunk/test_agchunk.py

@@ -0,0 +1,81 @@
+import torch
+import colossalai
+import pytest
+import torch.multiprocessing as mp
+from functools import partial
+from colossalai.testing import rerun_if_address_is_in_use, parameterize
+from colossalai.utils import free_port, get_current_device
+from colossalai.tensor import ProcessGroup as ColoProcessGroup
+from colossalai.tensor import ColoParameter
+from colossalai.gemini.ag_chunk import AgChunk
+
+
+def add_param(param_list, param_cp_list, *args, **kwargs):
+    param = ColoParameter(torch.empty(*args, **kwargs))
+    param_list.append(param)
+    param_cp_list.append(param.clone())
+
+
+def check_euqal(param, param_cp):
+    if param.device != param_cp.device:
+        temp = param.data.to(param_cp.device)
+    else:
+        temp = param.data
+    return torch.equal(temp, param_cp.data)
+
+
+@parameterize('init_device', [None, torch.device('cpu')])
+@parameterize('keep_gathered', [True, False])
+@parameterize('pin_memory', [True, False])
+def exam_chunk_init(init_device, keep_gathered, pin_memory):
+    world_size = torch.distributed.get_world_size()
+    pg = ColoProcessGroup()
+    my_chunk = AgChunk(
+        chunk_size=1024,
+        process_group=pg,
+        dtype=torch.float32,
+        init_device=init_device,
+        keep_gathered=keep_gathered,
+        pin_memory=pin_memory
+    )
+
+    param_list = []
+    param_cp_list = []
+
+    add_param(param_list, param_cp_list, 8, 8, 8, device='cuda')
+    add_param(param_list, param_cp_list, 4, 4)
+    add_param(param_list, param_cp_list, 4, 8, 2, device='cuda')
+    add_param(param_list, param_cp_list, 1, 1, 5)
+
+    for param in param_list:
+        my_chunk.append_tensor(param)
+    assert my_chunk.utilized_size == 597
+    for param, param_cp in zip(param_list, param_cp_list):
+        check_euqal(param, param_cp)
+    my_chunk.close_chunk()
+
+    if keep_gathered is False:
+        assert my_chunk.cpu_shard.size(0) == 1024 // world_size
+        my_chunk.shard_move(get_current_device())
+
+    my_chunk.access_chunk()
+
+    for param, param_cp in zip(param_list, param_cp_list):
+        check_euqal(param, param_cp)
+
+
+def run_dist(rank, world_size, port):
+    colossalai.launch(config={}, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
+    exam_chunk_init()
+
+
+@pytest.mark.dist
+@pytest.mark.parametrize('world_size', [1, 2, 4])
+@rerun_if_address_is_in_use()
+def test_chunk_function(world_size):
+    run_func = partial(run_dist, world_size=world_size, port=free_port())
+    mp.spawn(run_func, nprocs=world_size)
+
+
+if __name__ == '__main__':
+    test_chunk_function(2)