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tiny fix

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Former-commit-id: f8d8690bf4c2981f3151b4ccf07daeb4f3cd38a9
This commit is contained in:
hiyouga 2024-06-07 05:19:21 +08:00
parent 4f3c89a6eb
commit ca9468ff04
1 changed files with 7 additions and 8 deletions
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15
src/llamafactory/train/ppo/ppo_utils.py
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@ -32,10 +32,11 @@ def replace_model(model: "AutoModelForCausalLMWithValueHead", target: Literal["d
r"""
Replaces the default/reward modules in the model. The model is already unwrapped.
"""
v_head_layer = model.v_head.summary
if is_deepspeed_zero3_enabled():
import deepspeed # type: ignore
params = [model.v_head.summary.weight, model.v_head.summary.bias]
params = [v_head_layer.weight, v_head_layer.bias]
context_maybe_zero3 = deepspeed.zero.GatheredParameters(params, modifier_rank=0)
else:
context_maybe_zero3 = nullcontext()
@ -43,14 +44,12 @@ def replace_model(model: "AutoModelForCausalLMWithValueHead", target: Literal["d
model.pretrained_model.set_adapter(target) # set the LoRA adapter to be active
with context_maybe_zero3:
if target == "reward": # save default head temporarily
setattr(model, "default_head_weight", model.v_head.summary.weight.data.detach().clone())
setattr(model, "default_head_bias", model.v_head.summary.bias.data.detach().clone())
setattr(model, "default_head_weight", v_head_layer.weight.data.detach().clone())
setattr(model, "default_head_bias", v_head_layer.bias.data.detach().clone())
device = model.v_head.summary.weight.device
model.v_head.summary.weight.data = (
model.get_buffer("{}_head_weight".format(target)).detach().clone().to(device)
)
model.v_head.summary.bias.data = model.get_buffer("{}_head_bias".format(target)).detach().clone().to(device)
device = v_head_layer.weight.device
v_head_layer.weight.data = model.get_buffer("{}_head_weight".format(target)).detach().clone().to(device)
v_head_layer.bias.data = model.get_buffer("{}_head_bias".format(target)).detach().clone().to(device)
def dump_layernorm(model: "PreTrainedModel") -> Dict[str, torch.Tensor]: