wehub-resource-sync
192 lines
7.0 KiB
Markdown
192 lines
7.0 KiB
Markdown
# Ascend NPU
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关于Megatron-SWIFT在Ascend NPU上的环境准备，请参考[NPU最佳实践](../BestPractices/NPU-support.md)。
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## NPU 性能数据采集
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NPU性能采集通过`torch_npu.profiler.profile`接口进行采集，创建torch_npu.profiler.profile对象，通过start和stop接口控制采集性能数据，采集过程需要修改ms-swift源码，修改swift/megatron/trainers/base.py文件中的train函数，采集示例如下：
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```python
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import torch_npu
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...
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experimental_config = torch_npu.profiler._ExperimentalConfig(
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profiler_level=torch_npu.profiler.ProfilerLevel.Level1,
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aic_metrics=torch_npu.profiler.AiCMetrics.PipeUtilization,
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)
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prof = torch_npu.profiler.profile(
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activities=[
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torch_npu.profiler.ProfilerActivity.CPU,
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torch_npu.profiler.ProfilerActivity.NPU
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],
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schedule=torch_npu.profiler.schedule(wait=0, warmup=0, active=1, repeat=1, skip_first=6),
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on_trace_ready=torch_npu.profiler.tensorboard_trace_handler("./result"),
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profile_memory=False, # 关闭采集内存信息
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with_stack=False, # 关闭采集堆栈信息
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experimental_config=experimental_config)
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prof.start()
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# ms-swift 逻辑
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while state.iteration < args.train_iters:
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...
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metric, grad_norm, update_successful = train_step(train_data_iterator)
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# 性能数据采集
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prof.step()
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...
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prof.stop()
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```
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## NPU 精度数据采集
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### 安装msprobe
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```shell
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pip install mindstudio-probe
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```
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### 代码修改
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为了支持 msprobe 工具进行精度调试，我们需要修改 `swift/megatron/model/mm_gpt_model.py` 文件中的 `_patch_word_embeddings` 函数。主要改动是调整函数参数和内部实现逻辑，使其能够正确地对嵌入层进行patch
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下面是具体的修改内容：
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修改前：
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```python
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def _patch_word_embeddings(self, kwargs):
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origin_forward = VocabParallelEmbedding.forward
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def forward(_self, input_):
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args = get_args()
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reduce_scatter_embeddings = _self.reduce_scatter_embeddings
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_self.reduce_scatter_embeddings = False
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input_ = torch.masked_fill(input_, input_ < 0, 0)
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res = origin_forward(_self, input_)
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_self.reduce_scatter_embeddings = reduce_scatter_embeddings
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packed_seq_params = kwargs.get('packed_seq_params')
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# ...其他逻辑...
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return res
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VocabParallelEmbedding.forward = forward
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try:
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yield
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finally:
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VocabParallelEmbedding.forward = origin_forward
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def forward(
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self,
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input_ids: torch.Tensor,
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position_ids: torch.Tensor,
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attention_mask: torch.Tensor = None,
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decoder_input: torch.Tensor = None,
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labels: torch.Tensor = None,
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inference_params: InferenceParams = None,
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packed_seq_params: PackedSeqParams = None,
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**kwargs,
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) -> torch.Tensor:
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if decoder_input is not None:
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pass
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elif self.pre_process:
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kwargs.update({'input_ids': input_ids, 'packed_seq_params': packed_seq_params})
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with self._patch_word_embeddings(kwargs):
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decoder_input = self.language_model.embedding(input_ids=input_ids, position_ids=position_ids)
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# ...其他逻辑...
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```
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修改后：
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```python
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def _patch_word_embeddings(self, kwargs, emb): # 修改1
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origin_forward = emb.word_embeddings.forward # 修改2
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def forward(input_): # 修改3
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args = get_args()
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_self = emb.word_embeddings # 修改4
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reduce_scatter_embeddings = _self.reduce_scatter_embeddings
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_self.reduce_scatter_embeddings = False
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input_ = torch.masked_fill(input_, input_ < 0, 0)
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res = origin_forward(input_) # 修改5
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_self.reduce_scatter_embeddings = reduce_scatter_embeddings
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packed_seq_params = kwargs.get('packed_seq_params')
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# ...其他逻辑...
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return res
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emb.word_embeddings.forward = forward # 修改6
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try:
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yield
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finally:
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emb.word_embeddings.forward = origin_forward # 修改7
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def forward(
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self,
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input_ids: torch.Tensor,
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position_ids: torch.Tensor,
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attention_mask: torch.Tensor = None,
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decoder_input: torch.Tensor = None,
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labels: torch.Tensor = None,
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inference_params: InferenceParams = None,
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packed_seq_params: PackedSeqParams = None,
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**kwargs,
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) -> torch.Tensor:
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if decoder_input is not None:
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pass
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elif self.pre_process:
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kwargs.update({'input_ids': input_ids, 'packed_seq_params': packed_seq_params})
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with self._patch_word_embeddings(kwargs, self.language_model.embedding): # 修改8
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decoder_input = self.language_model.embedding(input_ids=input_ids, position_ids=position_ids)
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# ...其他逻辑...
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```
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主要变化包括：
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1. `_patch_word_embeddings` 方法增加了 `emb` 参数，用于接收 embedding 模块实例
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2. 直接获取 `emb.word_embeddings.forward` 而不是 `VocabParallelEmbedding.forward`
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3. 内部 `forward` 函数签名从 `(_self, input_)` 改为 `(input_)`
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4. 在函数内部通过 `emb.word_embeddings` 获取 `_self`
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5. 调用原始 forward 时直接传入 `input_`
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6. 使用 `emb.word_embeddings.forward` 进行替换和恢复操作（修改6、7）
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7. 在调用 `_patch_word_embeddings` 时传入 `self.language_model.embedding` 实例
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对文件swift/megatron/trainers/base.py中的train_step函数进行修改
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修改前：
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```python
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def train_step(self, forward_step_func, data_iterator, model, optimizer, opt_param_scheduler, config, *args,
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**kwargs):
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new_data_iterator = self._replace_data_iterator(data_iterator, model)
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return self._origin_train_step(forward_step_func, new_data_iterator, model, optimizer, opt_param_scheduler,
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config, *args, **kwargs)
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```
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修改后：
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```python
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def train_step(self, forward_step_func, data_iterator, model, optimizer, opt_param_scheduler, config, *args,
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**kwargs):
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new_data_iterator = self._replace_data_iterator(data_iterator, model)
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from msprobe.pytorch import PrecisionDebugger
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debugger = PrecisionDebugger(dump_path='./dump_path', level='mix', model=model)
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debugger.start()
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try:
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origin_train_step_out = self._origin_train_step(
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forward_step_func, new_data_iterator, model, optimizer, opt_param_scheduler,config, *args, **kwargs)
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finally:
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debugger.stop()
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debugger.step()
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return origin_train_step_out
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```
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### 使能
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另外，由于msprobe不支持融合计算，需要在启动脚本添加`--bias_dropout_fusion false`、`--bias_swiglu_fusion false`、`--cross_entropy_loss_fusion false`
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#### 示例
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```shell
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PYTORCH_NPU_ALLOC_CONF='expandable_segments:True' \
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NPROC_PER_NODE=2 \
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CUDA_VISIBLE_DEVICES=0,1 \
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megatron sft \
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--mcore_model Qwen2.5-7B-Instruct-mcore \
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--dataset 'AI-ModelScope/alpaca-gpt4-data-zh#500' \
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'AI-ModelScope/alpaca-gpt4-data-en#500' \
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'swift/self-cognition#500' \
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--tensor_model_parallel_size 2 \
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...
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--bias_dropout_fusion false \
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--bias_swiglu_fusion false \
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--cross_entropy_loss_fusion false
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```
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