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[gemini] improve compatibility and add static placement policy (#4479)

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* [gemini] remove distributed-related part from colotensor (#4379)

* [gemini] remove process group dependency

* [gemini] remove tp part from colo tensor

* [gemini] patch inplace op

* [gemini] fix param op hook and update tests

* [test] remove useless tests

* [test] remove useless tests

* [misc] fix requirements

* [test] fix model zoo

* [test] fix model zoo

* [test] fix model zoo

* [test] fix model zoo

* [test] fix model zoo

* [misc] update requirements

* [gemini] refactor gemini optimizer and gemini ddp (#4398)

* [gemini] update optimizer interface

* [gemini] renaming gemini optimizer

* [gemini] refactor gemini ddp class

* [example] update gemini related example

* [example] update gemini related example

* [plugin] fix gemini plugin args

* [test] update gemini ckpt tests

* [gemini] fix checkpoint io

* [example] fix opt example requirements

* [example] fix opt example

* [example] fix opt example

* [example] fix opt example

* [gemini] add static placement policy (#4443)

* [gemini] add static placement policy

* [gemini] fix param offload

* [test] update gemini tests

* [plugin] update gemini plugin

* [plugin] update gemini plugin docstr

* [misc] fix flash attn requirement

* [test] fix gemini checkpoint io test

* [example] update resnet example result (#4457)

* [example] update bert example result (#4458)

* [doc] update gemini doc (#4468)

* [example] update gemini related examples (#4473)

* [example] update gpt example

* [example] update dreambooth example

* [example] update vit

* [example] update opt

* [example] update palm

* [example] update vit and opt benchmark

* [hotfix] fix bert in model zoo (#4480)

* [hotfix] fix bert in model zoo

* [test] remove chatglm gemini test

* [test] remove sam gemini test

* [test] remove vit gemini test

* [hotfix] fix opt tutorial example (#4497)

* [hotfix] fix opt tutorial example

* [hotfix] fix opt tutorial example
This commit is contained in:
Hongxin Liu
2023-08-24 09:29:25 +08:00
committed by GitHub
parent 285fe7ba71
commit 27061426f7
82 changed files with 1008 additions and 4036 deletions
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79
docs/source/en/features/zero_with_chunk.md
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@@ -54,32 +54,38 @@ We also provide a lightweight chunk search mechanism to help users automatically
We will use `GeminiDDP` to use ZeRO with chunk-based memory management. This is our new torch.Module wrapper which uses ZeRO-DP and Gemini. ZeRO is for parallelism and Gemini is for memory management.
Also Make sure that your model is initialized under the context of ColoInitContext.
Gemini allows LazyInitContext, which can save memory when initializing large models with multi-GPUs.
If your model has `N` billion parameters and your GPU memory is `M` GB, we recommend you use LazyInitContext when `4N >= M`. Otherwise, LazyInitContext is optional.
<!--- doc-test-ignore-start -->
```python
with ColoInitContext(device='cpu', default_dist_spec=default_dist_spec, default_pg=default_pg):
with LazyInitContext(default_device=torch.device('cuda')):
model = gpt2_medium(checkpoint=True)
```
<!--- doc-test-ignore-end -->
Define the model parameters as follows:
We've provided `Booster` API which is user-friendly. We recommend you use `Booster` API. But if you still want to use low level API, you can read below content of this section.
Wrap the model with `GeminiDDP`.
<!--- doc-test-ignore-start -->
```python
chunk_manager = init_chunk_manager(model=module,
init_device=device,
hidden_dim=hidden_dim,
search_range_m=search_range_m,
min_chunk_size_m=min_chunk_size_m)
gemini_manager = GeminiManager(placement_policy, chunk_manager)
model = GeminiDDP(model, hidden_dim=hidden_dim, min_chunk_size_m=min_chunk_size_m)
```
<!--- doc-test-ignore-end -->
`hidden_dim` is the hidden dimension of DNN. Users can provide this argument to speed up searching. If users do not know this argument before training, it is ok. We will use a default value 1024. `min_chunk_size_m` is a floating point, being the minimum chunk size divided by 2^20 (e.g., if min_chunk_size_m=2.5, then the minimum chunk size should be 2.5*(2^20)).If the aggregate size of parameters is still smaller than the minimum chunk size, all parameters will be compacted into one small chunk.
Initialization of the optimizer.
<!--- doc-test-ignore-start -->
```python
optimizer = GeminiAdamOptimizer(model, lr=1e-3, initial_scale=2**5)
```
<!--- doc-test-ignore-start -->
Training
<!--- doc-test-ignore-start -->
```python
optimizer.zero_grad()
outputs = model(input_ids, attn_mask)
@@ -87,6 +93,7 @@ loss = criterion(outputs, input_ids)
optimizer.backward(loss)
optimizer.step()
```
<!--- doc-test-ignore-start -->
> ⚠️ Note: Please do not use `loss.backward()`, the standard way of writing is `optimizer.backward(loss)`.
### Train GPT
@@ -142,46 +149,6 @@ class GPTLMLoss(nn.Module):
return self.loss_fn(shift_logits.view(-1, shift_logits.size(-1)), shift_labels.view(-1))
```
Define tensor parallel and parameter sharding strategies for tensor parallelism:
```python
def tensor_parallelize(model: torch.nn.Module, pg: ProcessGroup):
for mn, module in model.named_modules():
for pn, param in module.named_parameters(recurse=False):
if hasattr(param, 'visited'):
continue
param.set_dist_spec(ReplicaSpec())
if 'mlp.c_fc' in mn:
if 'weight' in pn or 'bias' in pn:
split_param_col_tp1d(param, pg)
param.compute_spec.set_output_replicate(False)
else:
param.set_dist_spec(ReplicaSpec())
elif 'mlp.c_proj' in mn:
if 'weight' in pn:
split_param_row_tp1d(param, pg)
else:
param.set_dist_spec(ReplicaSpec())
elif 'wte' in mn or 'wpe' in mn:
split_param_col_tp1d(param, pg)
elif 'c_attn' in mn or 'c_proj' in mn:
split_param_col_tp1d(param, pg)
else:
param.set_dist_spec(ReplicaSpec())
param.visited = True
def split_param_single_dim_tp1d(dim: int, param: ColoParameter, pg: ProcessGroup):
spec = (ShardSpec([dim], [pg.tp_world_size()]), ComputeSpec(ComputePattern.TP1D))
param.set_tensor_spec(*spec)
def split_param_row_tp1d(param: ColoParameter, pg: ProcessGroup):
split_param_single_dim_tp1d(0, param, pg)
def split_param_col_tp1d(param: ColoParameter, pg: ProcessGroup):
split_param_single_dim_tp1d(-1, param, pg)
```
Write a function to get random inputs:
@@ -198,7 +165,7 @@ Finally, we define a model which uses Gemini + ZeRO DDP and define our training
from colossalai.nn.optimizer import HybridAdam
from colossalai.booster import Booster
from colossalai.zero import ColoInitContext
from colossalai.lazy import LazyInitContext
from colossalai.booster.plugin import GeminiPlugin
def main():
@@ -214,17 +181,13 @@ def main():
optimizer = HybridAdam(model.parameters(), lr=0.001)
torch.manual_seed(123)
default_pg = ProcessGroup(tp_degree=args.tp_degree)
default_dist_spec = ShardSpec([-1], [args.tp_degree])
# build GPT model
with ColoInitContext(device='cpu', default_dist_spec=default_dist_spec, default_pg=default_pg):
with ColoInitContext(default_device=torch.device('cuda')):
model = gpt2_medium(checkpoint=True)
pg = default_pg
# Tensor Parallelism (TP)
tensor_parallelize(model, pg)
# Gemini + ZeRO DP, Note it must be used after TP
plugin = GeminiPlugin(placement_policy='cuda', max_norm=1.0, initial_scale=2**5)
# Gemini + ZeRO DP
plugin = GeminiPlugin(max_norm=1.0, initial_scale=2**5)
booster = Booster(plugin=plugin)
model, optimizer, criterion, _, _ = booster.boost(model, optimizer, criterion)