wehub-resource-sync
58 lines
2.1 KiB
Python
58 lines
2.1 KiB
Python
# Copyright (c) ModelScope Contributors. All rights reserved.
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import numpy as np
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import torch
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from typing import TYPE_CHECKING
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from .base import TrainerCallback
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if TYPE_CHECKING:
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from swift.trainers import Trainer, TrainingArguments
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class LISACallback(TrainerCallback):
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def __init__(self, args: 'TrainingArguments', trainer: 'Trainer'):
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assert args.tuner_type == 'full', 'LISA only supports full parameter training.'
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super().__init__(args, trainer)
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self.n_layers = args.lisa_activated_layers
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self.step_interval = args.lisa_step_interval
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self.model = self.trainer.model
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layers_name = None
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layers = None
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for name, module in self.model.named_modules():
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if isinstance(module, torch.nn.ModuleList):
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layers_name = name
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layers = module
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break
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assert layers_name is not None
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self.layers_attribute = layers_name
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self.total_layers = len(layers)
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# Freeze all layers upon initialization
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self.freeze_all_layers()
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self.active_layers_indices = []
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self.switch_active_layers()
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def freeze_all_layers(self):
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layers = self.model.get_submodule(self.layers_attribute)
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for layer in layers:
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for param in layer.parameters():
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param.requires_grad = False
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def on_step_begin(self, args, state, control, **kwargs):
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# Check if it's time to switch active layers, including at step 0
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if state.global_step % self.step_interval == 0 or state.global_step == 1:
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self.switch_active_layers()
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def switch_active_layers(self):
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# First, disable gradients for all layers
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self.freeze_all_layers()
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# Randomly select n_layers to activate
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layers = self.model.get_submodule(self.layers_attribute)
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self.active_layers_indices = np.random.choice(range(self.total_layers), self.n_layers, replace=False)
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# Enable gradients only for the selected layers
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for idx in self.active_layers_indices:
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for param in layers[idx].parameters():
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param.requires_grad = True
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