[test] polish zero related unitest (#351)

colossalai/zero/sharded_model/utils.py

+import torch
+from colossalai.zero.sharded_model import ShardedModelV2
+
+import copy
+
+
+def col_model_deepcopy(sharded_model: ShardedModelV2, other_model: torch.nn.Module):
+    """
+    copy param of the ShardedModelV2 to other_model.
+    Note the other_model has to be the same as self.
+    """
+    for zero_param, param in zip(sharded_model.parameters(), other_model.parameters()):
+        assert hasattr(zero_param, 'col_attr')
+        shard_flag = zero_param.col_attr.data.is_sharded
+        if shard_flag:
+            sharded_model.shard_strategy.gather([zero_param.col_attr.data])
+        param.data = copy.deepcopy(zero_param.col_attr.data.payload)
+        if shard_flag:
+            sharded_model.shard_strategy.shard([zero_param.col_attr.data])

tests/test_zero_data_parallel/common.py

@@ -3,8 +3,10 @@ from functools import partial
 import torch
 import torch.distributed as dist
 import torch.nn as nn
+
 from colossalai.logging import get_dist_logger
 from colossalai.utils import checkpoint
+from colossalai.zero.sharded_model import ShardedModelV2
 
 LOGGER = get_dist_logger()
 
@@ -20,6 +22,21 @@ CONFIG = dict(fp16=dict(mode=None,),
               parallel=dict(pipeline=dict(size=1), tensor=dict(size=1, mode=None)))
 
 
+def run_fwd_bwd(model, data, label, criterion, enable_autocast=False):
+    model.train()
+    with torch.cuda.amp.autocast(enabled=enable_autocast):
+        if criterion:
+            y = model(data)
+            loss = criterion(y, label)
+        else:
+            loss = model(data, label)
+        loss = loss.float()
+    if isinstance(model, ShardedModelV2):
+        model.backward(loss)
+    else:
+        loss.backward()
+
+
 def checkpoint_wrapper(module, enable=True):
     if enable:
         module.forward = partial(checkpoint, module.forward)

tests/test_zero_data_parallel/test_shard_model_v2.py

@@ -3,81 +3,70 @@
 
 import copy
 from functools import partial
-
-import colossalai
 import pytest
-import torch
-import torch.distributed as dist
+
 import torch.multiprocessing as mp
+from torch.nn.parallel import DistributedDataParallel as DDP
+
+import colossalai
+from colossalai.zero.init_ctx import ZeroInitContext
 from colossalai.utils import free_port
 from colossalai.zero.shard_utils.tensor_shard_strategy import \
     TensorShardStrategy
 from colossalai.zero.sharded_model import ShardedModelV2
 from colossalai.zero.sharded_model._zero3_utils import cast_tensor_to_fp16
-from tests.components_to_test.registry import non_distributed_component_funcs
-from torch.nn.parallel import DistributedDataParallel as DDP
 
-from common import CONFIG, check_grads_padding
-
-
-def run_fwd_bwd(model, data, label, criterion, enable_autocast=False):
-    model.train()
-    with torch.cuda.amp.autocast(enabled=enable_autocast):
-        y = model(data)
-        loss = criterion(y, label)
-    loss = loss.float()
-    if isinstance(model, ShardedModelV2):
-        model.backward(loss)
-    else:
-        loss.backward()
-
-
-# with no criterion
-def run_fwd_bwd_no_criterion(model, data, label, enable_autocast=False):
-    model.train()
-    with torch.cuda.amp.autocast(enabled=enable_autocast):
-        loss = model(data, label)
-    if isinstance(model, ShardedModelV2):
-        model.backward(loss)
-    else:
-        loss.backward()
+from tests.components_to_test.registry import non_distributed_component_funcs
+from common import CONFIG, check_grads_padding, run_fwd_bwd
+from colossalai.zero.sharded_model.utils import col_model_deepcopy
 
 
-def run_dist(rank, world_size, port):
+def run_dist(rank, world_size, port, use_zero_init_ctx, enable_autocast):
     colossalai.launch(config=CONFIG, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
 
     test_models = ['repeated_computed_layers', 'resnet18', 'bert']
     shard_strategy = TensorShardStrategy()
     for model_name in test_models:
         get_components_func = non_distributed_component_funcs.get_callable(model_name)
-        model, train_dataloader, test_dataloader, optimizer, criterion = get_components_func()
-        model = model(checkpoint=True).half().cuda()
-        zero_model = ShardedModelV2(copy.deepcopy(model), shard_strategy)
-        if dist.get_world_size() > 1:
-            model = DDP(model)
+        model_builder, train_dataloader, _, _, criterion = get_components_func()
+
+        if use_zero_init_ctx:
+            with ZeroInitContext(convert_fp16=True, convert_cuda=True, shard_strategy=shard_strategy, shard_param=True):
+                zero_model = model_builder(checkpoint=True)
+            zero_model = ShardedModelV2(zero_model, shard_strategy)
+
+            model = model_builder(checkpoint=True).half()
+            col_model_deepcopy(zero_model, model)
+            model = model.cuda()
+        else:
+            model = model_builder(checkpoint=True).half().cuda()
+            zero_model = ShardedModelV2(copy.deepcopy(model), shard_strategy)
+
+        model = DDP(model)
 
         for i, (data, label) in enumerate(train_dataloader):
-            if i > 2:
+            if i > 3:
                 break
 
-            if criterion is None:
-                data, label = data.cuda(), label.cuda()
-                run_fwd_bwd_no_criterion(model, data, label, False)
-                run_fwd_bwd_no_criterion(zero_model, data, label, False)
-            else:
-                data, label = cast_tensor_to_fp16(data).cuda(), label.cuda()
-                run_fwd_bwd(model, data, label, criterion, False)
-                run_fwd_bwd(zero_model, data, label, criterion, False)
+            data, label = cast_tensor_to_fp16(data).cuda(), label.cuda()
+            run_fwd_bwd(model, data, label, criterion, enable_autocast)
+            run_fwd_bwd(zero_model, data, label, criterion, enable_autocast)
 
             check_grads_padding(model, zero_model, loose=True)
 
 
 @pytest.mark.dist
-@pytest.mark.parametrize("world_size", [1, 2, 4])
-def test_shard_model_v2(world_size):
-    run_func = partial(run_dist, world_size=world_size, port=free_port())
+@pytest.mark.parametrize("world_size", [1, 2])
+@pytest.mark.parametrize("enable_autocast", [True])
+@pytest.mark.parametrize("use_zero_init_ctx", [True])
+def test_shard_model_v2(world_size, use_zero_init_ctx, enable_autocast):
+    run_func = partial(run_dist,
+                       world_size=world_size,
+                       port=free_port(),
+                       use_zero_init_ctx=use_zero_init_ctx,
+                       enable_autocast=enable_autocast)
     mp.spawn(run_func, nprocs=world_size)
 
 
 if __name__ == '__main__':
-    test_shard_model_v2(world_size=2)
+    test_shard_model_v2(world_size=2, use_zero_init_ctx=True, enable_autocast=True)

tests/test_zero_data_parallel/test_sharded_model_with_ctx.py

-#!/usr/bin/env python
-# -*- encoding: utf-8 -*-
-
-import copy
-from functools import partial
-
-import colossalai
-import pytest
-import torch
-import torch.distributed as dist
-import torch.multiprocessing as mp
-from colossalai.utils import free_port
-from colossalai.zero.init_ctx import ZeroInitContext
-from colossalai.zero.shard_utils.tensor_shard_strategy import \
-    TensorShardStrategy
-from colossalai.zero.sharded_model import ShardedModelV2
-from tests.components_to_test.registry import non_distributed_component_funcs
-from torch.nn.parallel import DistributedDataParallel as DDP
-
-from common import CONFIG, check_grads, check_grads_padding
-
-
-def run_fwd_bwd(model, data, label, criterion, enable_autocast=False):
-    model.train()
-    with torch.cuda.amp.autocast(enabled=enable_autocast):
-        y = model(data)
-        loss = criterion(y, label)
-    loss = loss.float()
-    if isinstance(model, ShardedModelV2):
-        model.backward(loss)
-    else:
-        loss.backward()
-
-
-def run_dist(rank, world_size, port):
-    colossalai.launch(config=CONFIG, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
-    test_models = ['repeated_computed_layers', 'resnet18']
-    for model_name in test_models:
-        get_components_func = non_distributed_component_funcs.get_callable(model_name)
-        shard_strategy = TensorShardStrategy()
-        with ZeroInitContext(convert_fp16=True, convert_cuda=True, shard_strategy=shard_strategy, shard_param=True):
-            zero_model, train_dataloader, test_dataloader, optimizer, criterion = get_components_func()
-            zero_model = zero_model()
-        model = copy.deepcopy(zero_model)
-        zero_model = ShardedModelV2(zero_model, shard_strategy)
-        model_state_dict = zero_model.state_dict()
-        for n, p in model.named_parameters():
-            p.data = model_state_dict[n]
-        model = model.half().cuda()
-        if dist.get_world_size() > 1:
-            model = DDP(model)
-
-        for i, (data, label) in enumerate(train_dataloader):
-            if i > 2:
-                break
-            data, label = data.half().cuda(), label.cuda()
-            run_fwd_bwd(model, data, label, criterion, False)
-            run_fwd_bwd(zero_model, data, label, criterion, False)
-            if dist.get_world_size() > 1:
-                check_grads_padding(model, zero_model, loose=True)
-            else:
-                check_grads(model, zero_model, loose=True)
-
-
-@pytest.mark.dist
-def test_shard_model_v2():
-    world_size = 2
-    run_func = partial(run_dist, world_size=world_size, port=free_port())
-    mp.spawn(run_func, nprocs=world_size)
-
-
-if __name__ == '__main__':
-    test_shard_model_v2()

tests/test_zero_data_parallel/test_sharded_optim_v2_with_cpu_adam.py

@@ -78,7 +78,7 @@ def run_dist(rank, world_size, port):
 
 
 @pytest.mark.dist
-@pytest.mark.parametrize("world_size", [1, 2, 4])
+@pytest.mark.parametrize("world_size", [1, 2])
 def test_sharded_optim_v2(world_size):
     run_func = partial(run_dist, world_size=world_size, port=free_port())
     mp.spawn(run_func, nprocs=world_size)