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Correct loading of models with shared tensors when using accelerator.load_state() #2875

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merged 5 commits into from
Jul 15, 2024
Merged

Correct loading of models with shared tensors when using accelerator.load_state() #2875

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b97af0f
Enabled correct loading of models with shared tensors when using acce…
jkuntzer Jun 20, 2024
308bf24
removed unused import
jkuntzer Jun 20, 2024
7183764
added a test for a model with shared weights
jkuntzer Jul 9, 2024
5e43b7e
removed unnecessary bits
jkuntzer Jul 9, 2024
7aff18a
fixed linting errors
jkuntzer Jul 11, 2024
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6 changes: 3 additions & 3 deletions src/accelerate/checkpointing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@

import numpy as np
import torch
from safetensors.torch import load_file
from safetensors.torch import load_model
from torch.cuda.amp import GradScaler

from .utils import (
Expand Down Expand Up @@ -196,12 +196,12 @@ def load_accelerator_state(
ending = f"_{i}" if i > 0 else ""
input_model_file = input_dir.joinpath(f"{SAFE_MODEL_NAME}{ending}.safetensors")
if input_model_file.exists():
state_dict = load_file(input_model_file, device=str(map_location))
load_model(model, input_model_file, device=str(map_location), **load_model_func_kwargs)
else:
# Load with torch
input_model_file = input_dir.joinpath(f"{MODEL_NAME}{ending}.bin")
state_dict = torch.load(input_model_file, map_location=map_location)
models[i].load_state_dict(state_dict, **load_model_func_kwargs)
model.load_state_dict(state_dict, **load_model_func_kwargs)
logger.info("All model weights loaded successfully")
Comment on lines -204 to 205
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Any particular reason for this change? I'd expect only the prior to be modified.

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In the if statement, he's loading the safetensors model directly whereas before, we were only getting the state dict.

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load_model does both: it loads the file and uses it to populate the state_dict. Previously, each branch of the if-condition only loaded the file and after the if-condition, the model would load the state dict. Since load_model does both, I indented the statement on line 204 to become part of the else-clause. This becomes clearer when you have a look at the complete surroundings of the changes instead of only the affected lines.

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The other change in this line (aside from the indent) namely using model instead of models[i] is mostly cosmetic. My linter was complaining that the enumerate call defines model but it's never used.


# Optimizer states
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